ODV / Osisko Development Corp. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Osisko Development Corp.
US ˙ NYSE ˙ CA68828E8099

Mga Batayang Estadistika
LEI 984500A8CC57F67DJ124
CIK 1431852
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Osisko Development Corp.
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 29, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal exe

August 29, 2025 EX-99.3

OSISKO DEVELOPMENT CORP. as the Corporation - and - TSX TRUST COMPANY as the Warrant Agent WARRANT INDENTURE Providing for the Issue of up to 49,532,661 Warrants Dated as of August 15, 2025 TABLE OF CONTENTS

Exhibit 99.3 EXECUTION COPY OSISKO DEVELOPMENT CORP. as the Corporation - and - TSX TRUST COMPANY as the Warrant Agent WARRANT INDENTURE Providing for the Issue of up to 49,532,661 Warrants Dated as of August 15, 2025 TABLE OF CONTENTS Page ARTICLE 1 INTERPRETATION 2 1.1 Definitions 2 1.2 Gender and Number 6 1.3 Construction 7 1.4 Day not a Business Day 7 1.5 Time of the Essence 7 1.6 Monetary Ref

August 29, 2025 EX-99.2

UNDERWRITING AGREEMENT

Exhibit 99.2 EXECUTION COPY UNDERWRITING AGREEMENT August 15, 2025 Osisko Development Corp. 1100, av des Canadiens-de-Montréal Suite 300, P.O. Box 211 Montréal, QC H3B 2S2 Attention:      Sean Roosen, Chairman and Chief Executive Officer BMO Nesbitt Burns Inc. and RBC Dominion Securities Inc., as joint lead managers and joint bookrunners (together, the “Joint Bookrunners”), and Cantor Fitzgerald C

August 29, 2025 EX-99.4

FORM 51-102F3 MATERIAL CHANGE REPORT

Exhibit 99.4 FORM 51-102F3 MATERIAL CHANGE REPORT Item 1 Name and Address of the Company Osisko Development Corp. (the "Company") 1100 Avenue des Canadiens-des-Montréal, Suite 300 Montréal, Québec H3B 2S2 Item 2 Date of Material Change August 15, 2025 Item 3 News Release A news release with respect to the material change referred to in this report was issued by the Company through GlobeNewswire on

August 29, 2025 EX-99.1

INVESTOR RIGHTS AGREEMENT OSISKO DEVELOPMENT CORP. - and - DOUBLE ZERO CAPITAL LP AUGUST 15, 2025 TABLE OF CONTENTS

Exhibit 99.1 INVESTOR RIGHTS AGREEMENT OSISKO DEVELOPMENT CORP. - and - DOUBLE ZERO CAPITAL LP AUGUST 15, 2025 TABLE OF CONTENTS ARTICLE I INTERPRETATION 1 1.01 Definitions 1 1.02 Extended Meanings 3 1.03 Interpretation Not Affected by Headings, Etc. 3 1.04 Statutory References 3 1.05 Monetary References 4 1.06 Day Not a Business Day 4 ARTICLE II BOARD NOMINATION RIGHTS 4 2.01 Investor Nomination

August 20, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

August 20, 2025 EX-99.1

Osisko Development Announces Grant of Deferred Share Units

EXHIBIT 99.1 Osisko Development Announces Grant of Deferred Share Units MONTREAL, Aug. 20, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that it has granted 58,824 deferred share units ("DSUs") of the Company to Ms. Susan Craig, an independent director, as part of her recent appointment to the Company's board of directors

August 15, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal exe

August 15, 2025 EX-99.1

CREDIT AGREEMENT BARKERVILLE GOLD MINES LTD. as Borrower The Guarantors party hereto from time to time as Guarantors APPIAN ODV (JERSEY) LTD AND THE OTHER LENDERS PARTY HERETO FROM TIME TO TIME as Lenders TSX TRUST COMPANY as Collateral Agent APPIAN

Exhibit 99.1 CREDIT AGREEMENT BETWEEN BARKERVILLE GOLD MINES LTD. as Borrower -and- The Guarantors party hereto from time to time as Guarantors -and- APPIAN ODV (JERSEY) LTD AND THE OTHER LENDERS PARTY HERETO FROM TIME TO TIME as Lenders -and- TSX TRUST COMPANY as Collateral Agent -and- APPIAN ODV (JERSEY) LTD as Administrative Agent July 21, 2025 TABLE OF CONTENTS Page Article 1 INTERPRETATION 1

August 15, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execu

August 15, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execu

August 15, 2025 EX-99.1

OSISKO DEVELOPMENT CLOSES US$203 MILLION PRIVATE PLACEMENT FINANCING

Exhibit 99.1 OSISKO DEVELOPMENT CLOSES US$203 MILLION PRIVATE PLACEMENT FINANCING Montreal, Québec, August 15, 2025 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the successful closing of its previously announced private placement of 99,065,330 units of the Company (each, a "Unit") at a price of US$2.05 per Unit (the "Issue Price")

August 15, 2025 EX-99.1

FORM 51-102F3 MATERIAL CHANGE REPORT

Exhibit 99.1 FORM 51-102F3 MATERIAL CHANGE REPORT Item 1 Name and Address of the Company Osisko Development Corp. (the "Corporation") 1100 Avenue des Canadiens-des-Montréal, Suite 300 Montréal, Québec, H3B 2S2 Item 2 Date of Material Change July 21, 2025 Item 3 News Release A news release with respect to the material change referred to in this report was issued by the Corporation through GlobeNews

August 13, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

August 13, 2025 EX-99.1

Osisko Development Reports Second Quarter 2025 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise)

EXHIBIT 99.1 Osisko Development Reports Second Quarter 2025 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise) MONTREAL, Aug. 12, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended June 30, 2025 ("Q2 2025"). Q2 2025 HIGHLIGHTS Oper

August 13, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal exe

August 13, 2025 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended June 30, 2025. 2. No misrepre

August 13, 2025 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and six months ended June 30, 2025 and 2024

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and six months ended June 30, 2025 and 2024 Osisko Development Corp. Consolidated Statements of Financial Position As at June 30, 2025 and December 31 2024 (Unaudited) (Tabular amounts expressed in thousands of Canadian dollars) June 30, December 31,

August 13, 2025 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended June 30, 2025. 2. No

August 13, 2025 EX-99.2

OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and six months ended June 30, 2025

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and six months ended June 30, 2025 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three and six months ended June 30, 2025 ("Q2 2025") should be

August 1, 2025 EX-99.1

OSISKO DEVELOPMENT ANNOUNCES US$195 MILLION FINANCING

Exhibit 99.1 NEWS RELEASE OSISKO DEVELOPMENT ANNOUNCES US$195 MILLION FINANCING Montreal, Québec, July 31, 2025 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces today that it has entered into an agreement with a syndicate of underwriters, under which the underwriters have agreed to buy, on a "bought deal" private placement basis, 58,560,000 units

August 1, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execu

July 21, 2025 EX-99.1

Osisko Development Secures US$450 Million Financing Facility to Develop the Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Secures US$450 Million Financing Facility to Develop the Cariboo Gold Project HIGHLIGHTS US$450 million project loan facility secured from new strategic partner Appian Capital Advisory to fund the development and construction of the Cariboo Gold Project in B.C., Canada US$100 million initial draw enables the Company to accelerate project pre-construction activities

July 21, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

July 21, 2025 EX-99.1

Osisko Development Corp. Annual Report prepared in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act For the Financial Year Ended December 31, 2024

Exhibit 99.1 Osisko Development Corp. Annual Report prepared in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act For the Financial Year Ended December 31, 2024 1.       Introduction In this annual report ("Report") made in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act, S.C. 2023, c.-9 ("Act"), references to "Osisko

July 21, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execu

July 21, 2025 EX-99.2

Notice of Annual and special Meeting of Shareholders and Management Information Circular March 26, 2025

Exhibit 99.2 Notice of Annual and special Meeting of Shareholders and Management Information Circular March 26, 2025 Our annual and special meeting of shareholders will be held on May 7, 2025, at 1:30 P.M. (Eastern Time) at 1 Pl. Ville-Marie Suite 2500, Montréal, QC H3B 1R1, Canada. Shareholders may exercise their rights by attending the meeting or completing a form of proxy. If you have questions

July 7, 2025 6-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K/A Amendment No. 1 REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K/A Amendment No. 1 REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal

July 7, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

July 7, 2025 EX-99.1

Osisko Development Announces Positive Bulk Tonnage Ore Sorting Results for the Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Announces Positive Bulk Tonnage Ore Sorting Results for the Cariboo Gold Project HIGHLIGHTS X-ray transmission (XRT) ore sorter testwork of a ~80 tonne sample taken from the Cariboo underground achieved positive results consistent with 2025 FS parameters 42-55% waste rejection with 84-89% gold recovery achieved by sorting mid-size and oversize sample material includ

July 7, 2025 EX-99.1

CORRECTION - Osisko Development Announces Positive Bulk Tonnage Ore Sorting Results for the Cariboo Gold Project

EXHIBIT 99.1 CORRECTION - Osisko Development Announces Positive Bulk Tonnage Ore Sorting Results for the Cariboo Gold Project In a release issued under the same headline on July 7, 2025, by Osisko Development Corp. (NYSE: ODV, TSXV: ODV), please note that the highlights section and eleventh paragraph have been updated to reflect the correct reference to gold recovery for the 6–10 mm fraction of "9

June 16, 2025 EX-99.1

Osisko Development Appoints Susan Craig to Board of Directors as Independent Director

EXHIBIT 99.1 Osisko Development Appoints Susan Craig to Board of Directors as Independent Director MONTREAL, June 16, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the appointment of Ms. Susan Craig as independent director to the Company's board of directors effective immediately. "We are very pleased to welco

June 16, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

June 12, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

June 12, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execu

June 12, 2025 EX-99.1

Date and Signature Page

Exhibit 99.1 Prepared by the following Qualified Persons: ▪ Mathieu Belisle, P.Eng...............BBA Engineering Ltd. ▪ Amanda Fitch, P.Eng................BBA Engineering Ltd. ▪ Sebastien Guido, P.Eng............Alius Mine Consulting Inc. ▪ Philip Clark, P.Eng......................Clean Energy Consulting Inc. ▪ Rob Griffith, P.Eng. ....................Falkirk Environmental Consultants Ltd. ▪ Kathe

June 12, 2025 EX-99.1

Osisko Development Files NI 43-101 Feasibility Study Technical Report for the Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Files NI 43-101 Feasibility Study Technical Report for the Cariboo Gold Project MONTREAL, June 11, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the filing of a technical report (the "Technical Report") prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mine

May 30, 2025 EX-2.01

Extractive Sector Transparency Measures Act - Annual Report

UNCLASSIFIED - NON CLASSIFIÉ Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Osisko Development Corp.

May 30, 2025 EX-99.1

Osisko Development to Complete Third Deferred Payment Installment in Connection with the Tintic Acquisition; Engages Resource Stock Digest

EXHIBIT 99.1 Osisko Development to Complete Third Deferred Payment Installment in Connection with the Tintic Acquisition; Engages Resource Stock Digest MONTREAL, May 29, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that, in accordance with the terms of the Company's previously-completed acquisition in May 2022 of a 100% o

May 30, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report OSISKO DEVELOPMENT CORP. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report OSISKO DEVELOPMENT CORP. (Exact name of registrant as specified in its charter) Canada 001 41369 (State or other jurisdiction of incorporation) (Commission file number) 1100 Ave. des Canadiens-de-Montréal, Montréal, Quebec, Canada H3B 2S2 (Address of principal executive offices) (Zip code)

May 30, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 14, 2025 EX-99.1

Osisko Development Announces Annual Grant of Incentive Awards

EXHIBIT 99.1 Osisko Development Announces Annual Grant of Incentive Awards MONTREAL, May 13, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that, as part of the annual compensation review of its Board of Directors, it has granted an aggregate of (i) 1,273,900 stock options of the Company (the "Options") to certain senior of

May 14, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 8, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 8, 2025 EX-99.1

Osisko Development Announces Results of Shareholders' Meeting

EXHIBIT 99.1 Osisko Development Announces Results of Shareholders' Meeting MONTREAL, May 07, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the results of its annual and special meeting of shareholders of the Company (the "Meeting") held on May 7, 2025. A total of 80,489,188 common shares were voted at the Meeting, represen

May 7, 2025 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended March 31, 2025. 2. No misrepr

May 7, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execut

May 7, 2025 EX-99.1

Osisko Development Reports First Quarter 2025 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise)

EXHIBIT 99.1 Osisko Development Reports First Quarter 2025 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise) MONTREAL, May 06, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended March 31, 2025 ("Q1 2025"). Q1 2025 HIGHLIGHTS Opera

May 7, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 7, 2025 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three months ended March 31, 2025 and 2024

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three months ended March 31, 2025 and 2024 Osisko Development Corp. Consolidated Statements of Financial Position As at March 31, 2025 and December 31 2024 (Unaudited) (Tabular amounts expressed in thousands of Canadian dollars) March 31, December 31, 2025

May 7, 2025 EX-99.2

OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three months ended March 31, 2025

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three months ended March 31, 2025 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three months ended March 31, 2025 ("Q1 2025") should be read in conju

May 7, 2025 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended March 31, 2025. 2. No

April 28, 2025 EX-99.1

Osisko Development Announces Optimized Feasibility Study for Permitted Cariboo Gold Project with C$943 Million After-Tax NPV5% and 22.1% IRR at US$2,400/oz Base Case Gold Price; at US$3,300/oz Spot Gold C$2.1 Billion After-Tax NPV5% and 38.0% IRR (Al

EXHIBIT 99.1 Osisko Development Announces Optimized Feasibility Study for Permitted Cariboo Gold Project with C$943 Million After-Tax NPV5% and 22.1% IRR at US$2,400/oz Base Case Gold Price; at US$3,300/oz Spot Gold C$2.1 Billion After-Tax NPV5% and 38.0% IRR (All dollar amounts are expressed in CAD dollars, unless stated otherwise) HIGHLIGHTS1 Robust returns with base case after-tax NPV5% of $943

April 28, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2025 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

April 14, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2025 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

April 14, 2025 EX-99.1

Osisko Development Announces Supplemental Listing of Warrants

EXHIBIT 99.1 Osisko Development Announces Supplemental Listing of Warrants MONTREAL, April 14, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that its common share purchase warrants (the "Warrants") issued pursuant to private placements completed by the Company between October and November of 2024 will be liste

March 31, 2025 EX-99.30

MINE SAFETY DISCLOSURE

Exhibit 99.30 MINE SAFETY DISCLOSURE Osisko Development Corp. (the “Company”) is committed to the health and safety of its employees and in providing an incident free workplace. The Company maintains a comprehensive health and safety program that includes extensive training for all employees and contractors, emergency response preparedness, site inspections, incident investigation, regulatory comp

March 31, 2025 EX-99.23

CONSENT OF EXPERT

Exhibit 99.23 CONSENT OF EXPERT The undersigned hereby consents to the use of the report “Feasibility Study for the Cariboo Gold Project District of Wells, British Columbia, Canada”, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the Un

March 31, 2025 EX-99.15

CONSENT OF EXPERT

Exhibit 99.15 CONSENT OF EXPERT In connection with the Annual Report on Form 40-F for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp., the undersigned, on behalf of WSP Canada Inc. (the “Firm”), consents to (i) the quotation, inclusion or summary of those portions of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, Brit

March 31, 2025 EX-99.21

CONSENT OF EXPERT

Exhibit 99.21 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Michell

March 31, 2025 EX-99.3

OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and twelve months ended December 31, 2024

Table of Contents Exhibit 99.3 OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and twelve months ended December 31, 2024 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three and twelve months ended December 31, 2024 ("Q4 20

March 31, 2025 EX-99.16

CONSENT OF EXPERT

Exhibit 99.16 CONSENT OF EXPERT I, Saileshkumar Singh, P. Eng. consent to the following in connection with the Annual Report on Form 40-F filed for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells,

March 31, 2025 EX-99.27

CONSENT OF EXPERT

Exhibit 99.27 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Alan J.

March 31, 2025 EX-99.19

CONSENT OF EXPERT

Exhibit 99.19 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Jean-Fr

March 31, 2025 EX-99.20

CONSENT OF EXPERT

Exhibit 99.20 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Keith M

March 31, 2025 EX-99.25

CONSENT OF EXPERT

Exhibit 99.25 CONSENT OF EXPERT I, Laurentius Verburg, P. Geo. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, Briti

March 31, 2025 EX-99.8

Consent of Independent Registered Public Accounting Firm

Exhibit 99.8 Consent of Independent Registered Public Accounting Firm We hereby consent to the incorporation by reference in this Annual Report on Form 40-F for the year ended December 31, 2024 of Osisko Development Corp. of our report dated March 28, 2025, relating to the consolidated financial statements, which appears in Exhibit 99.2 incorporated by reference in this Annual Report on Form 40-F.

March 31, 2025 EX-99.1

ANNUAL INFORMATION FORM FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 DATED AS OF MARCH 28, 2025

Table of Contents Exhibit 99.1 ANNUAL INFORMATION FORM FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 DATED AS OF MARCH 28, 2025 Table of Contents TABLE OF CONTENTS GENERAL MATTERS 1 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION 1 CAUTIONARY NOTE TO U.S. INVESTORS REGARDING PREPARATION OF FINANCIAL INFORMATION 2 CAUTIONARY NOTE TO U.S. INVESTORS REGARDING THE USE OF MINERAL RESERVE AND M

March 31, 2025 EX-99.6

CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 99.6 CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the annual report of Osisko Development Corp. (the "Company") on Form 40-F for the fiscal year ended December 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Sean Roosen, Chief Executive Officer of the Co

March 31, 2025 EX-99.13

CONSENT OF EXPERT

Exhibit 99.13 CONSENT OF EXPERT I, John Cunning, P.Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British Colu

March 31, 2025 EX-99.10

CONSENT OF EXPERT

Exhibit 99.10 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Colin H

March 31, 2025 EX-99.24

CONSENT OF EXPERT

Exhibit 99.24 CONSENT OF EXPERT I, Thomas Rutkowski, P. Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British

March 31, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2025 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

March 31, 2025 EX-99.22

CONSENT OF EXPERT

Exhibit 99.22 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ David W

March 31, 2025 EX-99.14

CONSENT OF EXPERT

Exhibit 99.14 CONSENT OF EXPERT I, Paul Gauthier, P.Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2024 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British Col

March 31, 2025 EX-99.7

CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 99.7 CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the annual report of Osisko Development Corp. (the “Company”) on Form 40-F for the fiscal year ended December 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Alexander Dann, Chief Financial Officer and Vi

March 31, 2025 EX-99.5

CERTIFICATIONS

Exhibit 99.5 CERTIFICATIONS I, Alexander Dann, certify that: 1. I have reviewed this annual report on Form 40-F of Osisko Development Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with res

March 31, 2025 EX-99.17

CONSENT OF EXPERT

Exhibit 99.17 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Éric Le

March 31, 2025 EX-99.1

Osisko Development Reports Fourth Quarter and Year-End 2024 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise)

EXHIBIT 99.1 Osisko Development Reports Fourth Quarter and Year-End 2024 Results (All dollar amounts are expressed in Canadian dollars, unless stated otherwise) MONTREAL, March 28, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three and twelve months ended December 31, 2024 ("Q4 20

March 31, 2025 EX-99.11

CONSENT OF EXPERT

Exhibit 99.11 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Mathieu

March 31, 2025 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ☐ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or ☒ Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 Commission File Number 001-41369 OSISKO DEVELOPMENT CORP. (Exact name of registrant as specifi

March 31, 2025 EX-99.26

CONSENT OF EXPERT

Exhibit 99.26 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ William

March 31, 2025 EX-97

OSISKO DEVELOPMENT CORP. CLAWBACK POLICY

Exhibit 97 OSISKO DEVELOPMENT CORP. CLAWBACK POLICY A.Application of Policy This Clawback Policy (this “Policy”) applies in the event of any restatement (“Restatement”) of the financial results of Osisko Development Corp. (the “Corporation”) due to its material non-compliance with financial reporting requirements under applicable securities laws. This Policy does not apply to restatements that are

March 31, 2025 EX-99.12

CONSENT OF EXPERT

Exhibit 99.12 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Katheri

March 31, 2025 EX-99.18

CONSENT OF EXPERT

Exhibit 99.18 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Vincent

March 31, 2025 EX-99.4

CERTIFICATIONS

Exhibit 99.4 CERTIFICATIONS I, Sean Roosen, certify that: 1. I have reviewed this annual report on Form 40-F of Osisko Development Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respec

March 31, 2025 EX-99.9

CONSENT OF EXPERT

Exhibit 99.9 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Carl Pel

March 31, 2025 EX-99.2

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Consolidated Financial Statements For the years ended December 31, 2024 and 2023

Exhibit 99.2 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Consolidated Financial Statements For the years ended December 31, 2024 and 2023 Report of Independent Registered Public Accounting Firm To the Board of Directors and Shareholders of Osisko Development Corp. Opinion on the Financial Statements We have audited the accompanying consolidated statements of financial position of

March 31, 2025 EX-99.28

CONSENT OF EXPERT

Exhibit 99.28 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Richard

March 31, 2025 EX-99.29

CONSENT OF EXPERT

Exhibit 99.29 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Daniel

February 21, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

February 21, 2025 EX-99.1

VIA ELECTRONIC TRANSMISSION

EXHIBIT 99.1 VIA ELECTRONIC TRANSMISSION February 21, 2025 TO ALL APPLICABLE EXCHANGES AND COMMISSIONS: RE: OSISKO DEVELOPMENT CORP. Confirmation of Notice of Record and Meeting Dates We are pleased to confirm that Notice of Record and Meeting Dates was sent to The Canadian Depository for Securities. We advise the following with respect to the upcoming Annual and Special Meeting of Security Holder

February 4, 2025 EX-99.2

WARRANT INDENTURE [See attached] OSISKO DEVELOPMENT CORP. - and - TSX TRUST COMPANY SECOND SUPPLEMENTAL WARRANT INDENTURE Dated as of November 12, 2024

EX-99.2 3 tm255328d1ex99-2.htm EXHIBIT 99.2 Exhibit 99.2 EXHBIIT B WARRANT INDENTURE [See attached] OSISKO DEVELOPMENT CORP. - and - TSX TRUST COMPANY SECOND SUPPLEMENTAL WARRANT INDENTURE Dated as of November 12, 2024 THIS SUPPLEMENTAL WARRANT INDENTURE is dated the 12th day of November, 2024. BETWEEN: OSISKO DEVELOPMENT CORP., a corporation existing under the federal laws of Canada (hereinafter

February 4, 2025 EX-99.3

BLOCKER AGREEMENT [See attached]

EX-99.3 4 tm255328d1ex99-3.htm EXHIBIT 99.3 Exhibit 99.3 EXHBIIT C BLOCKER AGREEMENT [See attached] THIS AMENDED AND RESTATED SUPPLEMENTARY AGREEMENT made and dated the 2nd day of February, 2025 (this “Supplementary Agreement”). BETWEEN: OSISKO DEVELOPMENT CORP., a company existing under the federal laws of Canada, having its head office at 1100, av des Canadiens-de-Montreal, Suite 300, P.O. Box 2

February 4, 2025 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 tm255328d1ex99-1.htm EXHIBIT 99.1 Exhibit 99.1 EXHBIIT A JOINT FILING AGREEMENT The undersigned hereby agree that the statement on Schedule 13D with respect to the Shares and warrants of Osisko Development Corp. dated as of February 4, 2025 is, and any amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provi

February 3, 2025 EX-99.1

Osisko Development Intercepts 13.61 g/t Gold Over 4.15 Meters in Initial Infill Drilling at QR Mine Prospect, Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Intercepts 13.61 g/t Gold Over 4.15 Meters in Initial Infill Drilling at QR Mine Prospect, Cariboo Gold Project MONTREAL, Feb. 03, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce drilling results from its 2024 initial exploration and historic data validation infill drill campaign

February 3, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

January 10, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January 2025 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January 2025 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

January 10, 2025 EX-99.1

Osisko Development Announces Senior Management Update

EXHIBIT 99.1 Osisko Development Announces Senior Management Update MONTREAL, Jan. 09, 2025 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the appointment of David Rouleau as Vice President, Project Development. This appointment aligns with the Company's strategic focus on building an operations-driven team to advanc

December 20, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 20, 2024 EX-99.1

Osisko Development Announces Grant of Deferred Share Units

EXHIBIT 99.1 Osisko Development Announces Grant of Deferred Share Units MONTREAL, Dec. 19, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that it has granted 80,000 deferred share units ("DSUs") of the Company to Mr. Stephen Quin, an independent director, as part of his recent appointment to the Company's board of directors

December 13, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-4

6-K 1 f6k121324.htm FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suit

December 13, 2024 EX-99.1

Osisko Development Provides Bulk Sample and Underground Development Progress Update at Cariboo Gold Project

EX-99.1 2 exh991.htm PRESS RELEASE EXHIBIT 99.1 Osisko Development Provides Bulk Sample and Underground Development Progress Update at Cariboo Gold Project MONTREAL, Dec. 13, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to provide a progress update for its ongoing bulk sample and underground development activities at its

December 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 12, 2024 EX-99.1

Osisko Development Announces Change to the Board of Directors

EXHIBIT 99.1 Osisko Development Announces Change to the Board of Directors MONTREAL, Dec. 12, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that Ms. Marina Katusa has resigned from the Company's board of directors (the "Board") effective immediately. The Company thanks Ms. Katusa for her service as a director and wishes he

December 12, 2024 EX-99.1

Osisko Development Receives Environmental Management Act Permits for Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Receives Environmental Management Act Permits for Cariboo Gold Project MONTREAL, Dec. 12, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the granting of the Environmental Management Act permits for its 100%-owned Cariboo Gold Project ("Cariboo" or the "Project") located in centra

December 5, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 5, 2024 EX-99.1

Osisko Development Strengthens Board with Appointment of Stephen Quin as Independent Director

EXHIBIT 99.1 Osisko Development Strengthens Board with Appointment of Stephen Quin as Independent Director MONTREAL, Dec. 05, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the appointment of Mr. Stephen Quin, a seasoned mining executive, as independent director to the Company's board of directors effective imm

November 21, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

November 21, 2024 EX-99.1

Osisko Development Receives BC Mines Act Permits for Cariboo Gold Project; Environmental Management Act Permits Referred

EXHIBIT 99.1 Osisko Development Receives BC Mines Act Permits for Cariboo Gold Project; Environmental Management Act Permits Referred MONTREAL, Nov. 20, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the approval of the BC Mines Act permits for its 100%-owned Cariboo Gold Project ("Cariboo" or the "Project") lo

November 13, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal e

November 13, 2024 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and nine months ended September 30, 2024 and 2023

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and nine months ended September 30, 2024 and 2023 Osisko Development Corp. Consolidated Statements of Financial Position As at September 30, 2024 and December 31 2023 (Unaudited) (tabular amounts expressed in thousands of Canadian dollars) September

November 13, 2024 EX-99.1

Osisko Development Reports Third Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated)

EXHIBIT 99.1 Osisko Development Reports Third Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated) MONTREAL, Nov. 13, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended September 30, 2024 ("Q3 2024"). Q3 2024 HIG

November 13, 2024 EX-99.2

OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and nine months ended September 30, 2024

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management's Discussion and Analysis For the three and nine months ended September 30, 2024 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three and nine months ended September 30, 2024 ("Q3 2024

November 13, 2024 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended September 30, 2024. 2. No mis

November 13, 2024 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended September 30, 2024. 2

November 13, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

November 12, 2024 EX-99.1

Osisko Development Closes US$57.5 Million Marketed Private Placement of Units

EXHIBIT 99.1 Osisko Development Closes US$57.5 Million Marketed Private Placement of Units MONTREAL, Nov. 12, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the successful closing of its previously announced private placement of 31,946,366 units of the Company ("Units") at a price of US$1.80 per Unit, including

November 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-4

6-K 1 f6k111224.htm FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suit

November 8, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

November 8, 2024 EX-99.1

Osisko Development Provides Update for Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Provides Update for Cariboo Gold Project MONTREAL, Nov. 07, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that the Mines Act permit for its 100%-owned Cariboo Gold Project ("Cariboo" or the "Project") located in central British Columbia ("BC"), Canada has been referred for decis

October 25, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 25, 2024 EX-99.1

Osisko Development Announces Oversubscribed and Fully Allocated Private Placement of Units US$57.5 Million Brokered Private Placement (Including Exercise In Full of Option) Expected to close November 12, 2024

EXHIBIT 99.1 Osisko Development Announces Oversubscribed and Fully Allocated Private Placement of Units US$57.5 Million Brokered Private Placement (Including Exercise In Full of Option) Expected to close November 12, 2024 MONTREAL, Oct. 24, 2024 (GLOBE NEWSWIRE) - Montreal, Québec, October 24, 2024 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased

October 23, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 23, 2024 EX-99.1

OSISKO DEVELOPMENT ANNOUNCES US$50 MILLION MARKETED PRIVATE PLACEMENT OF UNITS

Exhibit 99.1 NYSE | TSXV: ODV NEWS RELEASE OSISKO DEVELOPMENT ANNOUNCES US$50 MILLION MARKETED PRIVATE PLACEMENT OF UNITS Montreal, Québec, October 23, 2024 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that it has entered into an agreement with certain agents (collectively, the "Lead Agents"), pursuant to which the Lead Agents hav

October 15, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 15, 2024 EX-99.1

Osisko Development Closes Final Tranche of Non-Brokered Private Placement for Total Aggregate Proceeds of US$34.5 Million

EXHIBIT 99.1 Osisko Development Closes Final Tranche of Non-Brokered Private Placement for Total Aggregate Proceeds of US$34.5 Million MONTREAL, Oct. 14, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the successful closing of its previously-announced non-brokered private placement of units of the Company ("Uni

October 8, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 8, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 8, 2024 EX-99.1

Osisko Development to Close Second Tranche of Non-Brokered Private Placement of Units

EXHIBIT 99.1 Osisko Development to Close Second Tranche of Non-Brokered Private Placement of Units MONTREAL, Oct. 07, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce, further to its news release dated October 1, 2024, that due to strong market demand, the Company intends to close a second tranche of its non-brok

October 8, 2024 EX-99.1

UPDATED -- Osisko Development to Close Further Tranches of Its Non-Brokered Private Placement of Units

EXHIBIT 99.1 UPDATED - Osisko Development to Close Further Tranches of Its Non-Brokered Private Placement of Units MONTREAL, Oct. 08, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce, further to its news release dated October 1, 2024, that the first tranche of its offering was oversubscribed at the time of closin

October 1, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 1, 2024 EX-99.1

Osisko Development Closes First Tranche of Previously Announced Non-Brokered Private Placement for US$24.2 Million

EXHIBIT 99.1 Osisko Development Closes First Tranche of Previously Announced Non-Brokered Private Placement for US$24.2 Million MONTREAL, Oct. 01, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the successful closing of the first tranche of its previously announced non-brokered private placement, announced on S

September 5, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of September 2024 Commission File Number: 001-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of September 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B

September 5, 2024 EX-99.1

Osisko Development Announces Non-Brokered Private Placement

EXHIBIT 99.1 Osisko Development Announces Non-Brokered Private Placement MONTREAL, Sept. 04, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. ("Osisko Development" or, the "Company") (NYSE: ODV, TSXV: ODV) is pleased to announce a non-brokered private placement of units of Osisko Development ("Units") at a price of USD $1.80 (the "Offering"), with each Unit consisting of one common share of the Co

August 20, 2024 EX-2.01.INS

EX-2.01.INS

0001431852 country:US odv:StateOfUtahMember 2023-01-01 2023-12-31 0001431852 odv:TinticMember 2023-01-01 2023-12-31 0001431852 country:MX odv:GovernmentOfMexicoMember 2023-01-01 2023-12-31 0001431852 country:CA odv:XatsullFirstNationMember 2023-01-01 2023-12-31 0001431852 country:CA odv:WilliamsLakeFirstNationMember 2023-01-01 2023-12-31 0001431852 country:CA odv:ProvinceOfQuebecDepartmentOfEnergy

August 20, 2024 EX-99.1

Extractive Sector Transparency Measures Act - Annual Report

Exhibit 99.1 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Osisko Development Corp Reporting Year From 1/1/2023 To: 12/31/2023 Date submitted 5/17/2024 Reporting Entity ESTMA Identification Number E335878 Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In accordance with the requirements of the ESTMA,

August 20, 2024 EX-99.1

Report on Fighting Against Forced Labour and Child Labour in Supply Chains Act Report For the Financial Year Ended December 31, 2023

Exhibit 99.1 Report on Fighting Against Forced Labour and Child Labour in Supply Chains Act Report For the Financial Year Ended December 31, 2023 Report on Fighting Against Forced Labour and Child Labour in Supply Chains Act Report For the Financial Year Ended December 31, 202 Contents About this Report About our Business Our structure, activities and supply chains Our structure Our activities Our

August 20, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal exe

August 20, 2024 EX-2.01.SCH

EX-2.01.SCH

It represents the information pertaining to the Cariboo Gold Project. Cariboo Gold Project It represents the information pertaining to the Coulon and James Bay Properties. Coulon and James Bay Properties It represents the information pertaining to the Sapuchi. Sapuchi It represents the information pertaining to the Tintic. Tintic CANADA MEXICO UNITED STATES It represents the information pertaining

August 20, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report OSISKO DEVELOPMENT CORP. (Exact name of registrant as specified in its charter) Canada 001 41369 (State or other jurisdiction of incorporation) (Commission file number) 1100 Ave. des Canadiens-de-Montréal, Montréal, Quebec, Canada H3B 2S2 (Address of principal executive offices) (Zip code)

August 13, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

August 13, 2024 EX-99.1

Osisko Development Reports Second Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated)

EXHIBIT 99.1 Osisko Development Reports Second Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated) MONTREAL, Aug. 12, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended June 30, 2024 ("Q2 2024"). Q2 2024 HIGHLIG

August 12, 2024 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and six months ended June 30, 2024 and 2023

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three and six months ended June 30, 2024 and 2023 Osisko Development Corp. Consolidated Statements of Financial Position As at June 30, 2024 and December 31 2023 (Unaudited) (tabular amounts expressed in thousands of Canadian dollars) June 30, December 31,

August 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal exe

August 12, 2024 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended June 30, 2024. 2. No

August 12, 2024 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended June 30, 2024. 2. No misrepre

August 12, 2024 EX-99.2

OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and six months ended June 30, 2024

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and six months ended June 30, 2024 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three and six months ended June 30, 2024 ("Q2 2024") should be

August 7, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-413

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

August 7, 2024 EX-99.1

Osisko Development Provides Exploration Update at Tintic Project

EXHIBIT 99.1 Osisko Development Provides Exploration Update at Tintic Project MONTREAL, Aug. 07, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to provide an update on exploration activities at its 100%-owned Tintic Project ("Tintic" or the "Tintic Project"), located in the historic East Tintic Mining District in central U

July 26, 2024 EX-99.1

Osisko Development Reports Lifting of Fire Evacuation Order Near Cariboo Gold Project; All Project Activities to Resume

EX-99.1 2 exh991.htm PRESS RELEASE EXHIBIT 99.1 Osisko Development Reports Lifting of Fire Evacuation Order Near Cariboo Gold Project; All Project Activities to Resume MONTREAL, July 26, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that the previously issued wildfire evacuation order announced on July 22, 202

July 26, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

July 22, 2024 EX-99.1

Osisko Development Moves Non-Essential Personnel From Cariboo Gold Project Off-Site Following Fire Evacuation Order

EXHIBIT 99.1 Osisko Development Moves Non-Essential Personnel From Cariboo Gold Project Off-Site Following Fire Evacuation Order MONTREAL, July 22, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that the Company has temporarily paused non-essential activities at its 100%-owned Cariboo Gold Project ("Cariboo" or the "Project

July 22, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

July 5, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

July 5, 2024 EX-99.1

Osisko Development Announces Annual Grant of Incentive Awards

EXHIBIT 99.1 Osisko Development Announces Annual Grant of Incentive Awards MONTREAL, July 05, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that effective July 4, 2024, as part of its annual compensation review, the Board of Directors of the Company has approved the grant of an aggregate of 2,797,400 incentive stock option

June 10, 2024 EX-99.1

Osisko Development Amends US$50 Million Credit Facility

EXHIBIT 99.1 Osisko Development Amends US$50 Million Credit Facility MONTREAL, June 10, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces it has entered into an amending agreement to the credit agreement (the "Amendment") with National Bank of Canada (the "Lender") made as of March 1, 2024 providing for a US$50 million delayed

June 10, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

June 3, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (

June 3, 2024 EX-99.1

Osisko Development to Complete Second Deferred Payment Installment in Connection With the Tintic Acquisition

EXHIBIT 99.1 Osisko Development to Complete Second Deferred Payment Installment in Connection With the Tintic Acquisition MONTREAL, June 03, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that, in accordance with the terms of the Company's previously-completed acquisition of a 100% ownership interest in the Tintic Project,

May 24, 2024 EX-99.1

STATEMENT UNDER THE ACT RESPECTING TRANSPARENCY MEASURES IN THE MINING, OIL AND GAS INDUSTRIES

Exhibit 99.1 STATEMENT UNDER THE ACT RESPECTING TRANSPARENCY MEASURES IN THE MINING, OIL AND GAS INDUSTRIES (s.1) Fiscal year covered by the statement: from January 1, 2023 to December 31, 2023. Name of the entity filing the statement: OSISKO DEVELOPMENT CORP. Name(s) of the subsidiary or subsidiaries for which the entity files the statement, where applicable: BARKEVILLE GOLD MINES LTD., TINTIC CO

May 24, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execut

May 23, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execut

May 23, 2024 EX-99.1

Extractive Sector Transparency Measures Act - Annual Report

Exhibit 99.1 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Osisko Development Corp Reporting Year From 1/1/2023 To: 12/31/2023 Date submitted 5/17/2024 Reporting Entity ESTMA Identification Number E335878 Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In accordance with the requirements of the ESTMA,

May 9, 2024 EX-99.1

Osisko Development Provides Corporate Updates

EXHIBIT 99.1 Osisko Development Provides Corporate Updates MONTREAL, May 09, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the following corporate updates: DSU Grant As part of Osisko Development's regular annual remuneration program, the Company has granted an aggregate of 283,250 deferred share units of the Company ("DSU

May 9, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 8, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 8, 2024 EX-99.1

Osisko Development Announces Results of Annual Meeting of Shareholders

EXHIBIT 99.1 Osisko Development Announces Results of Annual Meeting of Shareholders MONTREAL, May 07, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the results of its annual meeting of shareholders (the "Meeting") held on May 7, 2024. A total of 55,749,501 common shares were voted at the Meeting, representing approximately

May 7, 2024 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended March 31, 2024. 2. No misrepr

May 7, 2024 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended March 31, 2024. 2. No

May 7, 2024 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three months ended March 31, 2024 and 2023

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Unaudited Condensed Interim Consolidated Financial Statements For the three months ended March 31, 2024 and 2023 Osisko Development Corp. Consolidated Statements of Financial Position As at March 31, 2024 and December 31 2023 (Unaudited) (tabular amounts expressed in thousands of Canadian dollars) 2024 2023 (Note 3) Notes $

May 7, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal execut

May 7, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2 (A

May 7, 2024 EX-99.2

OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three months ended March 31, 2024

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three months ended March 31, 2024 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three months ended March 31, 2024 ("Q1 2024") should be read in conju

May 7, 2024 EX-99.1

Osisko Development Reports First Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated)

EXHIBIT 99.1 Osisko Development Reports First Quarter 2024 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated) MONTREAL, May 06, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended March 31, 2024 ("Q1 2024"). Q1 2024 HIGHLIGH

April 29, 2024 EX-99.1

601 – 90 Eglinton Ave East, Toronto, Ontario, Canada M4P 2Y3 +1 416 362 5135 | www.micon - international.com NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of America Effective Date

Exhibit 99.1 601 – 90 Eglinton Ave East, Toronto, Ontario, Canada M4P 2Y3 +1 416 362 5135 | www.micon - international.com NI 43 - 101 Technical Report, Mineral Resource Estimate for the Trixie Deposit, Tintic Project, Utah, United States of America Effective Date: March 14, 2024 Report Date: April 25, 2024 Prepared By: William J. Lewis, P.Geo. Ing. Alan J. San Martin, MAusIMM(CP) Richard Gowans, P

April 29, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

April 29, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

April 29, 2024 EX-99.1

Osisko Development Files Technical Report on Mineral Resource Estimate for the Trixie Deposit, Tintic Project

EXHIBIT 99.1 Osisko Development Files Technical Report on Mineral Resource Estimate for the Trixie Deposit, Tintic Project MONTREAL, April 26, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the filing of a technical report (the "Technical Report") for the updated mineral resource estimate ("MRE") on its 100%-owned undergrou

March 29, 2024 EX-99.5

CERTIFICATIONS

Exhibit 99.5 CERTIFICATIONS I, Alexander Dann, certify that: 1. I have reviewed this annual report on Form 40-F of Osisko Development Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with res

March 29, 2024 EX-99.13

CONSENT OF EXPERT

Exhibit 99.13 CONSENT OF EXPERT I, John Cunning, P.Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British Colu

March 29, 2024 EX-99.6

CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 99.6 CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the annual report of Osisko Development Corp. (the "Company") on Form 40-F for the fiscal year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Sean Roosen, Chief Executive Officer of the Co

March 29, 2024 EX-99.8

Consent of Independent Registered Public Accounting Firm

Exhibit 99.8 Consent of Independent Registered Public Accounting Firm We hereby consent to the incorporation by reference in this Annual Report on Form 40-F for the year ended December 31, 2023 of Osisko Development Corp. of our report dated March 28, 2024 relating to the consolidated financial statements, which appears in Exhibit 99.2 incorporated by reference in this Annual Report on Form 40-F.

March 29, 2024 EX-99.19

CONSENT OF EXPERT

Exhibit 99.19 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Jean-Fr

March 29, 2024 EX-99.11

CONSENT OF EXPERT

Exhibit 99.11 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Mathieu

March 29, 2024 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ☐ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or ☒ Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023 Commission File Number 001-41369 OSISKO DEVELOPMENT CORP. (Exact name of registrant as specifi

March 29, 2024 EX-99.29

CONSENT OF EXPERT

Exhibit 99.29 CONSENT OF EXPERT The undersigned hereby consents to being named as having approved the disclosure of certain scientific and technical information contained or incorporated by reference in Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Maggie Layman Name: Maggie Layman,

March 29, 2024 EX-99.23

CONSENT OF EXPERT

Exhibit 99.23 CONSENT OF EXPERT The undersigned hereby consents to the use of the report “Feasibility Study for the Cariboo Gold Project District of Wells, British Columbia, Canada”, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the Un

March 29, 2024 EX-99.3

OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and twelve months ended December 31, 2023

Table of Contents Exhibit 99.3 OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and twelve months ended December 31, 2023 The following management discussion and analysis ("MD&A") of the operations and financial position of Osisko Development Corp. and its subsidiaries ("Osisko Development" or the "Company") for the three and twelve months ended December 31, 2023 ("Q4 20

March 29, 2024 EX-99.4

CERTIFICATIONS

Exhibit 99.4 CERTIFICATIONS I, Sean Roosen, certify that: 1. I have reviewed this annual report on Form 40-F of Osisko Development Corp.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respec

March 29, 2024 EX-99.1

Osisko Development Reports Fourth Quarter And Year-End 2023 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated)

EXHIBIT 99.1 Osisko Development Reports Fourth Quarter And Year-End 2023 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated) MONTREAL, March 28, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three and twelve months ended December 31, 2023

March 29, 2024 EX-99.14

CONSENT OF EXPERT

Exhibit 99.14 CONSENT OF EXPERT I, Paul Gauthier, P.Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British Col

March 29, 2024 EX-99.27

CONSENT OF EXPERT

Exhibit 99.27 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Alan J.

March 29, 2024 EX-99.17

CONSENT OF EXPERT

Exhibit 99.17 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Éric Le

March 29, 2024 EX-99.28

CONSENT OF EXPERT

Exhibit 99.28 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Richard

March 29, 2024 EX-99.24

CONSENT OF EXPERT

Exhibit 99.24 CONSENT OF EXPERT I, Thomas Rutkowski, P. Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British

March 29, 2024 EX-99.16

CONSENT OF EXPERT

Exhibit 99.16 CONSENT OF EXPERT I, Saileshkumar Singh, P. Eng. consent to the following in connection with the Annual Report on Form 40-F filed for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells,

March 29, 2024 EX-99.7

CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 99.7 CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the annual report of Osisko Development Corp. (the “Company”) on Form 40-F for the fiscal year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Alexander Dann, Chief Financial Officer and Vi

March 29, 2024 EX-97

OSISKO DEVELOPMENT CORP. CLAWBACK POLICY

Exhibit 97 OSISKO DEVELOPMENT CORP. CLAWBACK POLICY A.Application of Policy This Clawback Policy (this "Policy") applies in the event of any restatement ("Restatement") of the financial results of Osisko Development Corp. (the "Corporation") due to its material non-compliance with financial reporting requirements under applicable securities laws. This Policy does not apply to restatements that are

March 29, 2024 EX-99.1

ANNUAL INFORMATION FORM FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 DATED AS OF MARCH 28, 2024

Table of Contents Exhibit 99.1 ANNUAL INFORMATION FORM FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 DATED AS OF MARCH 28, 2024 Table of Contents TABLE OF CONTENTS GENERAL MATTERS 1 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION 1 CAUTIONARY NOTE TO U.S. INVESTORS REGARDING PREPARATION OF FINANCIAL INFORMATION 2 CAUTIONARY NOTE TO U.S. INVESTORS REGARDING THE USE OF MINERAL RESERVE AND M

March 29, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

March 29, 2024 EX-99.26

CONSENT OF EXPERT

Exhibit 99.26 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ William

March 29, 2024 EX-99.21

CONSENT OF EXPERT

Exhibit 99.21 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Michell

March 29, 2024 EX-99.25

CONSENT OF EXPERT

Exhibit 99.25 CONSENT OF EXPERT I, Laurentius Verburg, P. Geo. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, Briti

March 29, 2024 EX-99.15

CONSENT OF EXPERT

Exhibit 99.15 CONSENT OF EXPERT I, Aytaç Göksu, P. Eng. consent to the following in connection with the Annual Report on Form 40-F for the year ended December 31, 2023 (“Annual Report”) of Osisko Development Corp.: (i) the quotation, inclusion or summary of those portions prepared by me of the technical report entitled Feasibility Study for the Cariboo Gold Project, District of Wells, British Colu

March 29, 2024 EX-99.30

MINE SAFETY DISCLOSURE

Exhibit 99.30 MINE SAFETY DISCLOSURE Osisko Development Corp. (the “Company”) is committed to the health and safety of its employees and in providing an incident free workplace. The Company maintains a comprehensive health and safety program that includes extensive training for all employees and contractors, emergency response preparedness, site inspections, incident investigation, regulatory comp

March 29, 2024 EX-99.18

CONSENT OF EXPERT

Exhibit 99.18 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Vincent

March 29, 2024 EX-99.9

CONSENT OF EXPERT

Exhibit 99.9 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Carl Pel

March 29, 2024 EX-99.12

CONSENT OF EXPERT

Exhibit 99.12 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Katheri

March 29, 2024 EX-99.20

CONSENT OF EXPERT

Exhibit 99.20 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Keith M

March 29, 2024 EX-99.10

CONSENT OF EXPERT

Exhibit 99.10 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the 2023 Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ Co

March 29, 2024 EX-99.22

CONSENT OF EXPERT

Exhibit 99.22 CONSENT OF EXPERT The undersigned hereby consents to the use of their report, and the information derived therefrom, as well as the reference to their name, in each case where used or incorporated by reference in the Annual Report on Form 40-F of Osisko Development Corp. being filed with the United States Securities and Exchange Commission, and any amendments thereto. By: /s/ David W

March 29, 2024 EX-99.2

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Consolidated Financial Statements For the years ended December 31, 2023 and 2022

Exhibit 99.2 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Consolidated Financial Statements For the years ended December 31, 2023 and 2022 Report of Independent Registered Public Accounting Firm To the Shareholders and Board of Directors of Osisko Development Corp. Opinion on the Financial Statements We have audited the accompanying consolidated statements of financial position of

March 15, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

March 15, 2024 EX-99.1

Osisko Development Announces Mineral Resource Update for the Trixie Deposit, Tintic Project

EXHIBIT 99.1 Osisko Development Announces Mineral Resource Update for the Trixie Deposit, Tintic Project Measured resources of 119,847 tonnes grading 27.36 grams per tonne ("g/t") gold ("Au") and 61.73 g/t silver ("Ag"), for a total of 105,437 ounces ("oz") Au and 237,868 oz Ag. Indicated resources of 124,743 tonnes grading 11.17 g/t Au and 59.89 g/t Ag, for a total of 44,811 oz Au and 240,211 oz

March 4, 2024 EX-99.1

Osisko Development Secures US$50 Million Funding to Commence Underground Development at Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Secures US$50 Million Funding to Commence Underground Development at Cariboo Gold Project MONTREAL, March 04, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the Company has entered into a credit agreement with National Bank of Canada (the "Lender") providing for a US$50 million d

March 4, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-4136

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S2

February 22, 2024 EX-99.1

TSX TRUST COMPANY

TSX TRUST COMPANY VIA ELECTRONIC TRANSMISSION February 22, 2024 TO ALL APPLICABLE EXCHANGES AND COMMISSIONS: RE: OSISKO DEVELOPMENT CORP.

February 22, 2024 EX-99.1

Osisko Development Intercepts 610 g/t Gold Over 0.46 Meters in Underground Drilling at Trixie, Tintic Project

EXHIBIT 99.1 Osisko Development Intercepts 610 g/t Gold Over 0.46 Meters in Underground Drilling at Trixie, Tintic Project MONTREAL, Feb. 22, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the remaining drilling and underground chip sampling results from new development areas as part of its 2023 exploration pro

February 22, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

February 22, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

February 21, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

February 21, 2024 EX-99.1

Osisko Development Provides Update on Upcoming Year-End 2023 Results

EXHIBIT 99.1 Osisko Development Provides Update on Upcoming Year-End 2023 Results MONTREAL, Feb. 21, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that it has undertaken a review of the carrying value of its assets in accordance with International Financial Reporting Standards (the "Impairment Analysis") as at December 31,

February 2, 2024 EX-99.1

Osisko Development Announces Management Update

EXHIBIT 99.1 Osisko Development Announces Management Update MONTREAL, Feb. 02, 2024 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces today that François Vézina, Senior Vice President, Project Development, Technical Services and Environment, will be leaving the Company on March 1, 2024, to pursue another opportunity in the mining s

February 2, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 28, 2023 EX-99.1

Osisko Development Announces Management Updates

EXHIBIT 99.1 Osisko Development Announces Management Updates MONTREAL, Dec. 28, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces today that Luc Lessard, Chief Operating Officer ("COO"), will be retiring from the Company at the end of 2023 to pursue other personal and professional commitments, namely as President and Chief Exe

December 28, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 21, 2023 EX-99.1

Osisko Development Intercepts 443.64 G/T Gold Over 1.19 Meters in Underground Sampling at Trixie, Tintic Project

EXHIBIT 99.1 Osisko Development Intercepts 443.64 G/T Gold Over 1.19 Meters in Underground Sampling at Trixie, Tintic Project MONTREAL, Dec. 21, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce drilling and underground chip sampling results from new development areas as part of its 2023 exploration program at its

December 21, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 6, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

December 6, 2023 EX-99.1

Osisko Development Commences Surface Exploration Drill Campaign on Copper-Gold Porphyry Targets at Tintic Project

EXHIBIT 99.1 Osisko Development Commences Surface Exploration Drill Campaign on Copper-Gold Porphyry Targets at Tintic Project MONTREAL, Dec. 06, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the commencement of an initial surface diamond drilling exploration campaign to test for copper-gold-molybdenum porphyr

November 15, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

November 15, 2023 EX-99.1

Osisko Development Corp. and O3 Mining Inc. Announce Formation of "Electric Elements Mining Corp." to Explore James Bay Properties for Lithium Creation of Premier Lithium Exploration Company in James Bay Region Fully-Subscribed C$4.1 Million Financin

EXHIBIT 99.1 Osisko Development Corp. and O3 Mining Inc. Announce Formation of "Electric Elements Mining Corp." to Explore James Bay Properties for Lithium Creation of Premier Lithium Exploration Company in James Bay Region Fully-Subscribed C$4.1 Million Financing to Fund First Phase of Lithium Exploration Program Continued Exposure to and Advancement of Highly Prospective Lithium Exploration Asse

November 9, 2023 EX-4.1

EX-4.1

November 9, 2023 EX-4.2

EX-4.2

November 9, 2023 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OSISKO DEVELOPMENT CORP. (Exact name of registr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OSISKO DEVELOPMENT CORP. (Exact name of registrant as specified in its charter) Canada N/A (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification Number) 110

November 9, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2

November 9, 2023 EX-3.1

SCHEDULE A

SCHEDULE A 8. Other provisions, if any The directors may, between annual meetings of shareholders, appoint one or more additional directors of the Corporation to serve until the next annual meeting of shareholders, but the number of additional directors shall not at any time exceed one-third of the number of directors who held office at the expiration of the last meeting of the shareholders of the

November 9, 2023 EX-3.2

OSISKO DEVELOPMENT CORP. OSISKO DÉVELOPPEMENT CORP. BY-LAW NO. 1

OSISKO DEVELOPMENT CORP. OSISKO DÉVELOPPEMENT CORP. BY-LAW NO. 1 TABLE OF CONTENTS SECTION 1 - INTERPRETATION 1 1.1 Definitions 1 1.2 Other Definitions 1 SECTION 2 - GENERAL BUSINESS 2 2.1 Registered Office 2 2.2 Corporate Seal 2 2.3 Financial Year 2 2.4 Execution of Instruments 2 2.5 Delivery of Document 3 SECTION 3 - BORROWING AND SECURITY 3 3.1 Borrowing Power 3 3.2 Custody of Securities 3 3.3

November 9, 2023 EX-99.1

Osisko Development Reports Third Quarter 2023 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated)

EXHIBIT 99.1 Osisko Development Reports Third Quarter 2023 Results (All monetary references are expressed in Canadian dollars, unless otherwise indicated) MONTREAL, Nov. 08, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to report its financial and operating results for the three months ended September 30, 2023 ("Q3 2023")

November 9, 2023 EX-4.3

OSISKO DEVELOPMENT CORP. as the Corporation - and - TSX TRUST COMPANY as the Warrant Agent WARRANT INDENTURE Providing for the Issue of up to 31,500,000 Warrants Dated as of March 4, 2022 TABLE OF CONTENTS

NON-BROKERED OFFERING OSISKO DEVELOPMENT CORP. as the Corporation - and - TSX TRUST COMPANY as the Warrant Agent WARRANT INDENTURE Providing for the Issue of up to 31,500,000 Warrants Dated as of March 4, 2022 TABLE OF CONTENTS Page ARTICLE 1 INTERPRETATION 2 1.1 Definitions 2 1.2 Gender and Number 6 1.3 Construction 6 1.4 Day not a Business Day 7 1.5 Time of the Essence 7 1.6 Monetary References

November 8, 2023 EX-99.2

OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and nine months ended September 30, 2023

Table of Contents Exhibit 99.2 OSISKO DEVELOPMENT CORP. Management’s Discussion and Analysis For the three and nine months ended September 30, 2023 The following management discussion and analysis (“MD&A”) of the operations and financial position of Osisko Development Corp. and its subsidiaries, (“Osisko Development” or the “Company”) for the three and nine months ended September 30, 2023 (“Q3 202

November 8, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant’s name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300 (Address of principal e

November 8, 2023 EX-99.1

OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Condensed Consolidated Financial Statements For the three and nine months ended September 30, 2023

Exhibit 99.1 OSISKO DEVELOPMENT CORP. . . . . . . . . . . . . . . . . . . Condensed Consolidated Financial Statements For the three and nine months ended September 30, 2023 Osisko Development Corp. Consolidated Statements of Financial Position As at September 30, 2023 and December 31, 2022 (Unaudited) (Expressed in thousands of Canadian dollars) September 30, December 31, 2023 2022 Notes $ $ Asset

November 8, 2023 EX-99.3

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.3 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Sean Roosen, Chair of the Board and Chief Executive Officer of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended September 30, 2023. 2. No mis

November 8, 2023 EX-99.4

FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE

Exhibit 99.4 FORM 52-109F2 CERTIFICATION OF INTERIM FILINGS FULL CERTIFICATE I, Alexander Dann, Chief Financial Officer and Vice President, Finance of Osisko Development Corp., certify the following: 1. Review: I have reviewed the interim financial report and interim MD&A (together, the “interim filings”) of Osisko Development Corp. (the “issuer”) for the interim period ended September 30, 2023. 2

October 11, 2023 EX-99.1

Osisko Development Intercepts 54.95 g/t Gold Over 2.59 Meters in Underground Drilling at Trixie, Tintic Project; Commences Underground Porphyry Exploration Drilling

EXHIBIT 99.1 Osisko Development Intercepts 54.95 g/t Gold Over 2.59 Meters in Underground Drilling at Trixie, Tintic Project; Commences Underground Porphyry Exploration Drilling MONTREAL, Oct. 11, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce underground infill and exploration diamond drilling ("DD") results a

October 11, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-41

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-41369 Osisko Development Corp. (Translation of registrant's name into English) 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Quebec H3B 2S

October 11, 2023 EX-99.1

Osisko Development Receives Environmental Assessment Certificate for Cariboo Gold Project

EXHIBIT 99.1 Osisko Development Receives Environmental Assessment Certificate for Cariboo Gold Project MONTRÉAL, Oct. 10, 2023 (GLOBE NEWSWIRE) - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that it has received an Environmental Assessment ("EA") Certificate for the Company's 100%-owned Cariboo Gold Project ("Cariboo" or the "Projec

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CA:ODV CA$ 4.07
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