ORN / Orion Group Holdings, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Disclaimer 2 This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange

Exhibit 99.2 Investor Presentation July 2025 Disclaimer 2 This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a number of risks and uncertainties, many of

ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2025 RESULTS and Reaffirms FISCAL YEAR 2025 Guidance

Exhibit 99.1 ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2025 RESULTS and Reaffirms FISCAL YEAR 2025 Guidance HOUSTON – July 29, 2025 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”, “Orion”), a leading specialty construction company, today reported its financial results for the second quarter ended June 30, 2025. Highlights for the quarter ended June 30, 2025: (Comparisons to second quart

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2025 ORION GROUP HOLDING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 30, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is entered into as of September 27, 2023 (the “Effective Date”), by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”), and Gordon Scott Thanisch (“Key Employee”). The Company and Key Employee collectively herein referred to as the “Parties” and individually as a “Party.” W I T N E S S E T H:

Separation and General Release Agreement

Exhibit 10.2 EXECUTION VERSION Separation and General Release Agreement This Separation and General Release Agreement (“Agreement”), is entered into on the date this Agreement becomes effective, between G. Scott Thanisch (“You” or “Your”) and Orion Group Holdings, Inc. (the “Company”). The Parties agree that this Agreement represents the full and complete agreement concerning all matters between t

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 23, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Disclaimer 2 This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange

Exhibit 99.1 Investor Presentation June 2025 Disclaimer 2 This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a number of risks and uncertainties, many of

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 6, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

May 23,

May 23, 2025 Alison Vasquez Subject: Employment Offer Dear Alison, We are pleased to offer you the position of Executive Vice President, Chief Financial Officer and Treasurer at Orion Group Holdings, Inc.

Orion Group Holdings Announces CFO Transition Alison Vasquez, a highly skilled leader with more than 25 years of financial experience in public companies, will join as CFO CEO taps Vasquez to help lead next phase of growth and profitability Company r

Exhibit 99.1 Orion Group Holdings Announces CFO Transition Alison Vasquez, a highly skilled leader with more than 25 years of financial experience in public companies, will join as CFO CEO taps Vasquez to help lead next phase of growth and profitability Company reiterates 2025 guidance HOUSTON, June 10, 2025 (GLOBE NEWSWIRE) - Orion Group Holdings, Inc. (NYSE: ORN) (“Orion” or the “Company”), a le

Regulation FD Disclosure, 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 28, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

Orion Group Holdings Announces Dual Listing

Exhibit 99.1 Orion Group Holdings Announces Dual Listing HOUSTON, May 28, 2025 (GLOBE NEWSWIRE) - Orion Group Holdings, Inc. (NYSE: ORN) (“Orion” or the “Company”), a leading specialty construction company, today announced the dual listing of its common stock on NYSE Texas, the newly launched fully electronic equities exchange based in Dallas. The Company will maintain its primary listing on the N

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 ORION GROUP HOLDINGS, INC. (Exact name of regis

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 ORION GROUP HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 26-0097459 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2025 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2025 RESULTS HOUSTON – April 29, 2025 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the first quarter ended March 31, 2025. Highlights for the quarter ended March 31, 2025: ●Contract revenues increased 17.4% to $188.7 million versus the prior year p

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2025 ORION GROUP HOLDIN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, for Use of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ⌧ Filed by a party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary proxy statement ◻ Definitive proxy stateme

ORION GROUP HOLDINGS, INC. (formerly Orion Marine Group, Inc.), a Delaware corporation (formerly Hunter Acquisition Corp.), a Delaware corporation AMENDED AND RESTATED BYLAWS As amended on March 20, 2025 ARTICLE 1 OFFICES

Exhibit 3.1 ORION GROUP HOLDINGS, INC. (formerly Orion Marine Group, Inc.), a Delaware corporation (formerly Hunter Acquisition Corp.), a Delaware corporation AMENDED AND RESTATED BYLAWS As amended on March 20, 2025 ARTICLE 1 OFFICES Section 1.1. Registered Office. The registered office of Orion Group Holdings, Inc., a Delaware corporation (the “Corporation”), shall be the registered office named

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 20, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-33891 ORION GRO

AMENDMENT NO. 6 TO LOAN AGREEMENT

Exhibit 10.25 AMENDMENT NO. 6 TO LOAN AGREEMENT This AMENDMENT NO. 6 TO LOAN AGREEMENT (this “Amendment”), dated as of March 4, 2025, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (“Orion”), the Subsidiaries of Orion identified on the signature pages hereto as “Borrowers” (together with Orion, each, a “Borrower”, and collectively “Borrowers”), the Lenders party he

When in doubt about whether particular non-public information is “material,” you should presume it is material. If you are unsure whether information is “material,” then contact the Legal Department.

Exhibit 19.1 Insider Trading Policy (ORNLEG006 -Version 5) Page 1 Orion Group Holdings, Inc. January 8, 2025 INTRODUCTION This Insider Trading Policy (this “Policy”) describes the standards of Orion Group Holdings, Inc. and its subsidiaries (collectively the “Company” or “Orion”) on trading or instigating the trading of the Company’s securities or securities of certain other publicly traded compan

21 .1

Exhibit 21.1 LIST OF CORPORATE ENTITIES (UPDATED 12/31/24) Orion Administrative Services, Inc. East & West Jones Placement Areas, LLC Preferred Tool Services, Inc. Orion Marine Group, LLC Orion Marine Contractors, Inc. Northwest Marine Construction, ULC Schneider E&C Company, Inc. Orion Industrial Construction, LLC Orion Construction, LLC Orion Marine Construction, Inc. SSL South, LLC OM Marine Se

ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS HOUSTON – March 4, 2025 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the fourth quarter and full year ended December 31, 2024. Highlights for the quarter ended December 31, 2024: ●Contract revenues increased 7.6% to $216

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 4, 2025 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

DISCLAIMER This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Ac

Exhibit 99.1 Orion Group Holdings, Inc. Delivering Predictable Excellence November 2024 DISCLAIMER This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a n

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2024 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2024 RESULTS HOUSTON – October 30, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the third quarter ended September 30, 2024. Highlights for the quarter ended September 30, 2024: ●Contract revenues of $226.7 million ●GAAP net income of $4.3 mill

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 15, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

Termination of a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 16, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commis

ORION GROUP HOLDINGS PRICES $25.0 MILLION PUBLIC OFFERING OF COMMON STOCK

EXHIBIT 99.2‌ ORION GROUP HOLDINGS PRICES $25.0 MILLION PUBLIC OFFERING OF COMMON STOCK September 11, 2024 / EST HOUSTON, September 11, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (“Orion” or the “Company”), a leading specialty construction company, today announced that it has priced its previously announced underwritten public offering of 4,860,000 shares of its common stock at a public offerin

ORION GROUP HOLDINGS, INC. 4,860,000 Shares of Common Stock

Filed Pursuant to Rule 424(b)(5) Registration No. 333-279527 PROSPECTUS SUPPLEMENT (To Prospectus dated May 28, 2024) ORION GROUP HOLDINGS, INC. 4,860,000 Shares of Common Stock We are offering 4,860,000 shares of our common stock, par value $0.01 per share, pursuant to this prospectus supplement and the accompanying base prospectus that it supplements. Our common stock is listed for trading on th

ORION GROUP HOLDINGS ANNOUNCES PROPOSED PUBLIC OFFERING OF COMMON STOCK

EXHIBIT 99.1 ORION GROUP HOLDINGS ANNOUNCES PROPOSED PUBLIC OFFERING OF COMMON STOCK September 10, 2024 / EST HOUSTON, September 10, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (“Orion” or the “Company”), a leading specialty construction company, today announced that it intends to offer and sell shares of its common stock in an underwritten public offering. In connection with the offering, Orion

ORION GROUP HOLDINGS, INC. 4,860,000 Shares of Common Stock, par value $0.01 per share Underwriting Agreement

Exhibit 1.1 Execution Version ORION GROUP HOLDINGS, INC. 4,860,000 Shares of Common Stock, par value $0.01 per share Underwriting Agreement September 10, 2024 CRAIG-HALLUM CAPITAL GROUP LLC As Representative of the several Underwriters listed in Schedule 1 to the Underwriting Agreement c/o CRAIG-HALLUM CAPITAL GROUP LLC 222 South Ninth Street, Suite 350 Minneapolis, Minnesota 55402 Ladies and Gent

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 10, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commis

SUBJECT TO COMPLETION, DATED SEPTEMBER 10, 2024

The information in this preliminary prospectus supplement and the accompanying base prospectus, relating to an effective registration statement under the Securities Act of 1933, as amended, is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 16, 2024 ORION GROUP HOLDI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 16, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissio

A T A G LA N CE Orion is a leading marine and specialty construction company in the U.S., Canada and Caribbean Basin KEY STATISTICS $711.8M 2023 Revenue $23.8M 2023 Adj. EBITDA 1994 Founded Houston, TX Headquarters NYSE:ORN Ticker ~2,400 Employees C

Exhibit 99.1 Orion Group Holdings, Inc. Delivering Predictable Excellence August 2024 DISCLA IMER This presentation contains, and the officers and directors of the Company may from time to time make, may constitute or include projections or other forward-looking statements within the meaning of the “safe harbor” provisions of Section 27A of the Securities Exchange Act of 1933, as amended, and Sect

AMENDMENT NO. 5 TO LOAN AGREEMENT This AMENDMENT NO. 5 TO LOAN AGREEMENT (this "Amendment"), dated as of July 26, 2024, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation ("Orion"), the Subsidiaries of Orion identified on

Exhibit 10.5 AMENDMENT NO. 5 TO LOAN AGREEMENT This AMENDMENT NO. 5 TO LOAN AGREEMENT (this "Amendment"), dated as of July 26, 2024, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation ("Orion"), the Subsidiaries of Orion identified on the signature pages hereto as "Borrowers" (together with Orion, each, a "Borrower", and collectively "Borrowers"), the Lenders party her

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2024 ORION GROUP HOLDING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2024 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2024 RESULTS HOUSTON – July 24, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the second quarter ended June 30, 2024. Highlights for the quarter ended June 30, 2024: ●Contract revenues of $192.2 million ●GAAP net loss of $6.6 million or $0.20

ORN / Orion Group Holdings, Inc. / Portolan Capital Management, LLC - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d –1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d–2. (Amendment No. )* Orion Group Holdings, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) July 10, 2024 (Date of Event Which Require

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 28, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 2, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

PURCHASE AND SALE AGREEMENT

Exhibit 10.1 PURCHASE AND SALE AGREEMENT THIS PURCHASE AND SALE AGREEMENT (“Agreement”) is made as of the July 2, 2024 (the “Effective Date”) by and between EAST & WEST JONES PLACEMENT AREAS, LLC, a Texas limited liability company formerly known as CPB Properties, LLC (“Seller”), and Capital Development Partners Acquisitions, LLC, a Georgia limited liability company (“Purchaser”). The Seller and t

AMENDMENT NO. 4 TO LOAN AGREEMENT

Exhibit 10.1 AMENDMENT NO. 4 TO LOAN AGREEMENT This AMENDMENT NO. 4 TO LOAN AGREEMENT (this "Amendment"), dated as of June 28, 2024, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation ("Orion"), the Subsidiaries of Orion identified on the signature pages hereto as "Borrowers" (together with Orion, each, a "Borrower", and collectively "Borrowers"), the Lenders party her

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 14, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

As Filed with the Securities and Exchange Commission on May 23, 2024

As Filed with the Securities and Exchange Commission on May 23, 2024 Registration No.

May 23, 2024

May 23, 2024 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

Calculation of Filing Fee Tables Form S-3 (Form Type) Orion Group Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Orion Group Holdings, Inc.

As Filed with the Securities and Exchange Commission on May 17, 2024

As Filed with the Securities and Exchange Commission on May 17, 2024 Registration No.

ORION GROUP HOLDINGS, INC. EMPLOYEE STOCK PURCHASE PLAN ARTICLE I

‌Exhibit 10.1 ORION GROUP HOLDINGS, INC. EMPLOYEE STOCK PURCHASE PLAN ARTICLE I PURPOSE The purpose of this Plan is to provide Eligible Employees of the Company, and its Designated Subsidiaries with an opportunity to acquire Stock in the Company, thereby attracting, retaining and rewarding such employees and strengthening the mutual interest between employees and the Company’s stockholders. The Pl

AMENDMENT NO. 1 TO ORION GROUP HOLDINGS, INC.’S 2022 LONG-TERM INCENTIVE PLAN

Exhibit 10.2 AMENDMENT NO. 1 TO ORION GROUP HOLDINGS, INC.’S 2022 LONG-TERM INCENTIVE PLAN This Amendment No. 1 (this “Amendment”) to the 2022 Long-Term Incentive Plan the (“2022 LTIP”) is made by Orion Group Holdings, Inc. (the “Company”) pursuant to the 2022 LTIP, as follows: WHEREAS, the Company previously adopted the 2022 LTIP for the benefit its eligible participants; WHEREAS, pursuant to Sec

Calculation of Filing Fee Tables Form S-8 (Form Type) Orion Group Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Orion Group Holdings, Inc.

As filed with the Securities and Exchange Commission on May 17, 2024

As filed with the Securities and Exchange Commission on May 17, 2024 Registration No.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 16, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

AMENDMENT NO. 3 TO LOAN AGREEMENT

Exhibit 10.6 AMENDMENT NO. 3 TO LOAN AGREEMENT This AMENDMENT NO. 3 TO LOAN AGREEMENT (this "Amendment"), dated as of April 24, 2024, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation ("Orion"), the Subsidiaries of Orion identified on the signature pages hereto as "Borrowers" (together with Orion, each, a "Borrower", and collectively "Borrowers"), the Lenders party he

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN RESTRICTED SHARE AGREEMENT

Exhibit 10.3 ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN RESTRICTED SHARE AGREEMENT This Restricted Share Agreement (this “Agreement”) is made and entered into as of the date of grant (the “Date of Grant”) set forth in the applicable Notice of Grant of Restricted Shares by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”) and you (“Notice of Grant”). WHERE

EMPLOYMENT AGREEMENT

Exhibit 10.2 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is entered into as of March 20, 2024 (the “Effective Date”), by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”), and E. Chipman Earle (“Key Employee”). The Company and Key Employee collectively herein referred to as the “Parties” and individually as a “Party.” W I T N E S S E T H: WHEREAS,

ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN PERFORMANCE STOCK UNIT AGREEMENT

Exhibit 10.4 ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN PERFORMANCE STOCK UNIT AGREEMENT This Performance Stock Unit Agreement (this “Agreement”) is made and entered into as of the date of grant (the “Date of Grant”) set forth in the applicable Notice of Grant of Performance Stock Units by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”) and you (“Notice

ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2024 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2024 RESULTS HOUSTON – April 24, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the first quarter ended March 31, 2024. Highlights for the quarter ended March 31, 2024: ●Contract revenues of $160.7 million ●GAAP net loss was $6.1 million or $0.1

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ⌧ Filed by a party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary proxy statement ◻ Definitive proxy stateme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, for Use of

Orion Group Holdings, Inc. Announces Retirement of Board Member

Exhibit 99.1 Orion Group Holdings, Inc. Announces Retirement of Board Member HOUSTON – March 25, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (“Orion” or the “Company”), a leading specialty construction company, announced today that Richard L. Daerr, Jr., who has served as an independent member of the Company’s Board of Directors (the “Board”) since 2007 and was Chairman of the Board from 2007 to

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 21, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

DISCLAIMER This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Ac

Exhibit 99.2 Orion Group Holdings, Inc. Delivering Predictable Excellence March 2024 DISCLAIMER This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a numb

AMENDMENT NO. 1 TO LOAN AGREEMENT

Exhibit 10.22 AMENDMENT NO. 1 TO LOAN AGREEMENT This AMENDMENT NO. 1 TO LOAN AGREEMENT (this "Amendment"), dated as of December 1, 2023, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation ("Orion"), the Subsidiaries of Orion identified on the signature pages hereto as "Borrowers" (together with Orion, each, a "Borrower", and collectively "Borrowers"), the Lenders party

21 .1

Exhibit 21.1 LIST OF CORPORATE ENTITIES (UPDATED 12/31/23) Orion Administrative Services, Inc. East & West Jones Placement Areas, LLC Preferred Tool Services, Inc. Orion Marine Group, LLC Orion Marine Contractors, Inc. Northwest Marine Construction, ULC Schneider E&C Company, Inc. Orion Industrial Construction, LLC Orion Construction, LLC Orion Marine Construction, Inc. SSL South, LLC OM Marine Se

AMENDMENT NO. 2 TO LOAN AGREEMENT

Exhibit10.23 AMENDMENT NO. 2 TO LOAN AGREEMENT This AMENDMENT NO. 2 TO LOAN AGREEMENT (this “Amendment”), dated as of February 27, 2024, is entered into by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (“Orion”), the Subsidiaries of Orion identified on the signature pages hereto as “Borrowers” (together with Orion, each, a “Borrower”, and collectively “Borrowers”), the Lenders party

Edward Chipman Earle

Exhibit 10.29 November 20, 2023 Edward Chipman Earle XXXXXX XXXXXX Subject: Employment Offer Dear Chip, We are pleased to offer you the position of Executive Vice President, General Counsel, Chief Administrative Officer, and Corporate Secretary at Orion Group Holdings, Inc. The position will be located at our corporate office in Houston, Texas and you will be responsible for the Legal, Risk Manage

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-3389

END OF POLICY

Exhibit 97.1 Clawback Policy (ORN LEG020 Clawback Policy) Effective: August 8, 2023 (Version 0.0) I. CLAWBACK EVENTS A. Restatement Clawback If Orion Group Holdings, Inc. (the “Company”) is required to undertake a Restatement, then the Company’s Compensation Committee (see the below definition of “Committee”) of its Board of Directors (“Board”) will review all incentive-based compensation (whether

ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS HOUSTON – February 28, 2024 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the fourth quarter and full year ended December 31, 2023. Highlights for the quarter ended December 31, 2023: ●Contract revenues of $201.6 million

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 28, 2024 ORION GROUP HOL

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 28, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

Land Sale Contract, dated February 20, 2024, by and between a subsidiary of Orion Group Holdings, Inc. and Brixx Technologies LLC.

Exhibit 10.1 LAND SALE CONTRACT (Approximately 341.3 Acres of Property [Jones Spoils], Harris County, Texas) THE STATE OF TEXAS§ § COUNTY OF HARRIS§ THIS LAND SALE CONTRACT (this “Contract”) is made and entered into as of the Effective Date (as defined herein), by and between EAST & WEST JONES PLACEMENT AREAS, LLC, a Texas limited liability company formerly known as CPB Properties, LLC, as Seller

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 20, 2024 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

ORN / Orion Group Holdings, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7 )* Orion Group Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate b

2 Disclaimer This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange

Exhibit 99.1 Investor Presentation NobleCon19 - December 2023 2 Disclaimer This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a number of risks and uncer

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 4, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

Orion Group Holdings, Inc. Names Chip Earle as General Counsel

Exhibit 99.1 Orion Group Holdings, Inc. Names Chip Earle as General Counsel HOUSTON – November 28, 2023 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, announced today the appointment of Edward Chipman (“Chip”) Earle as Executive Vice President, General Counsel, Chief Administrative Officer, Chief Compliance Officer and Corporate Secretary, effec

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 27, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2023 RESULTS

ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2023 RESULTS HOUSTON – October 25, 2023 – Orion Group Holdings, Inc.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 25, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

Employment Agreement by and between Orion Group Holdings, Inc. and Travis J. Boone, effective September 27, 2023.

Execution Copy Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is entered into as of September 27, 2023 (the “Effective Date”), by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”), and Travis J. Boone (“Key Employee”). The Company and Key Employee collectively herein referred to as the “Parties” and individually as a “Party.” W I T N E S

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commis

Employment Agreement by and between Orion Group Holdings, Inc. and Scott Thanisch, effective September 27, 2023.

Exhibit 10.2 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is entered into as of September 27, 2023 (the “Effective Date”), by and between Orion Group Holdings, Inc., a Delaware corporation (the “Company”), and Gordon Scott Thanisch (“Key Employee”). The Company and Key Employee collectively herein referred to as the “Parties” and individually as a “Party.” W I T N E S S E T H:

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 20, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commis

2 Disclaimer This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange

Exhibit 99.1 Investor Presentation September 2023 2 Disclaimer This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a number of risks and uncertainties, ma

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

July 31, 2023

July 31, 2023 By Hand Delivery Peter R. Buchler XXX XXX RE: Notice of Non-Renewal Employment Agreement Dear Mr. Buchler: This letter is provided pursuant to Section 2.1 (Term) of the Employment Agreement between you and Orion Group Holdings, Inc., a Delaware corporation (“Company”), dated as of January 1, 2015, as amended through the Fourth Amendment, dated June 30, 2021, (the “Employment Agreemen

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2023 RESULTS

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS SECOND QUARTER 2023 RESULTS HOUSTON – July 26, 2023 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the second quarter ended June 30, 2023. Highlights for the quarter ended June 30, 2023: ●Contract revenues of $182.5 million increased 14.7% sequentially ●Net loss w

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 26, 2023 ORION GROUP HOLDING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 26, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Land Sale-Leaseback Contract, dated June 21, 2023, by and between Orion Marine Construction, Inc., a Florida corporation (successor by merger to T.W. LaQuay Dredging, Inc., a Texas corporation) (“Seller”), and Pelican Marine Services, LLC, a Louisiana limited liability company (“Purchaser”).

Exhibit 10.1 PURCHASE AND SALE AGREEMENT THIS PURCHASE AND SALE AGREEMENT (this “Agreement”) is entered into effective as of the Effective Date (as defined in Section 23) between ORION MARINE CONSTRUCTION, INC., a Florida corporation (successor by merger to T.W. LaQuay Dredging, Inc., a Texas corporation) (“Seller”), and PELICAN MARINE SERVICES, LLC, a Louisiana limited liability company (“Purchas

Land Sale-Leaseback Contract, dated June 5, 2023, by and between Orion Marine Construction, Inc., a Florida corporation (successor by merger to T.W. LaQuay Dredging, Inc., a Texas corporation) (“Seller”), and Store Capital Acquisitions, LLC, a Delaware limited liability company (“Purchaser”).

Exhibit 10.2 PURCHASE AND SALE AGREEMENT THIS PURCHASE AND SALE AGREEMENT (this “Agreement”) is made and entered into as of June 5, 2023 (“Effective Date”), by and between STORE CAPITAL ACQUISITIONS, LLC, a Delaware limited liability company (“Purchaser”), and ORION MARINE CONSTRUCTION, INC., a Florida corporation (“Seller”). Except as otherwise expressly defined herein, capitalized terms will hav

ORION GROUP HOLDINGS STRENGHTHENS LIQUIDITY POSITION Executes two real estate sale-leasebacks for total transaction value of $20.3 million

Exhibit 99.1 ORION GROUP HOLDINGS STRENGHTHENS LIQUIDITY POSITION Executes two real estate sale-leasebacks for total transaction value of $20.3 million HOUSTON – June 26, 2023 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today announced two real estate sale-leaseback transactions for a total value of $20.3 million. The Company entered into a s

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 21, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 18, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2023 ORION GROUP HOLDINGS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

Orion Group Holdings, Inc. Announces Closing of $103 Million Senior Secured Credit Facility and $13 Million Equipment Sale-Leaseback

EXHIBIT 99.1 Orion Group Holdings, Inc. Announces Closing of $103 Million Senior Secured Credit Facility and $13 Million Equipment Sale-Leaseback HOUSTON, May 16, 2023 (GLOBE NEWSWIRE) - Orion Group Holdings, Inc. (NYSE: ORN) (the "Company"), a leading specialty construction company, today announced the closing of a new 3-year $103 million senior secured asset based credit facility with White Oak

LOAN AGREEMENT dated as of May 15, 2023 ORION GROUP HOLDINGS, INC. and CERTAIN OF ITS SUBSIDIARIES from time to time party hereto as BORROWERS, THE ENTITIES FROM TIME TO TIME PARTY HERETO, as Lenders, WHITE OAK COMMERCIAL FINANCE, LLC, as Administrat

Exhibit 10.3 LOAN AGREEMENT dated as of May 15, 2023 among ORION GROUP HOLDINGS, INC. and CERTAIN OF ITS SUBSIDIARIES from time to time party hereto as BORROWERS, THE ENTITIES FROM TIME TO TIME PARTY HERETO, as Lenders, WHITE OAK COMMERCIAL FINANCE, LLC, as Administrative Agent and Collateral Agent TABLE OF CONTENTS Page ARTICLE I CERTAIN DEFINED TERMS; CERTAIN RULES OF CONSTRUCTION‌1 SECTION 1.01

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2023 ORION GROUP HOLDINGS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission Fi

ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2023 RESULTS Secured contract for East West Jones properties for purchase price of $36 million

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS FIRST QUARTER 2023 RESULTS Secured contract for East West Jones properties for purchase price of $36 million HOUSTON – May 8, 2023 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported its financial results for the first quarter ended March 31, 2023. Highlights for the quarter ended March 31, 202

[Signature Pages Follow]

Exhibit 10.1 May 5, 2023 Orion Group Holdings, Inc. and its Subsidiaries 12000 Aerospace, Suite 300 Houston, Texas 77034 Attention: Peter R. Buchler Re:Consent Letter Ladies and Gentlemen: We refer to (a) that certain Credit Agreement, dated as of August 5, 2015, by and among Orion Group Holdings, Inc. (formerly known as Orion Marine Group, Inc.) (the “Borrower”), certain Subsidiaries of the Borro

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING SEC File Number: 001-33891 CUSIP Number: 68628V308 (Check one): □ Form 10-K □ Form 20-F □ Form 11-K ⌧ Form 10-Q □ Form 10-D □ Form N-SAR □ Form N-CSR For Period Ended: March 31, 2023 □ Transition Report on Form 10-K □ Transition Report on Form 20-F □ Transition Report on Form 11-K □ Tran

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 26, 2023 ORION GROUP HOLDIN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 26, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Land Sale Contract, dated April 26, 2023, by and between Orion Group Holdings, Inc. and Equity Resource Partners – East West, LLC.

Exhibit 10.1 LAND SALE CONTRACT (Approximately 341.3 Acres of Property [Jones Spoils], Harris County, Texas) THE STATE OF TEXAS § § COUNTY OF HARRIS § THIS LAND SALE CONTRACT (this “Contract”) is made and entered into as of the Effective Date (as defined herein), by and between EAST AND WEST JONES PLACEMENT AREAS, LLC, a Texas limited liability company formerly known as CPB Properties, LLC, as Sel

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, for Use of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Confidential, for Use of

21 .1

Exhibit 21.1 LIST OF CORPORATE ENTITIES (UPDATED 12/31/22) Orion Administrative Services, Inc. East & West Jones Placement Areas, LLC Preferred Tool Services, Inc. Orion Marine Group, LLC Orion Marine Contractors, Inc. Northwest Marine Construction, ULC Schneider E&C Company, Inc. Orion Industrial Construction, LLC (fka F. Miller Construction, LLC) Orion Construction, LLC Orion Marine Construction

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-3389

Consent Letter, dated March 14, 2023, by and between Orion Marine Group, Inc. as Borrower, certain subsidiaries of the Borrower, as Guarantors, the Lenders Party thereto, Regions Bank, as Administrative Agent and Collateral Agent, and Bank of America, N.A. and BOKF, NA dba Bank of Texas, as Co-Syndication Agents.

EX-10.1 2 orn-20230314xex10d1.htm EX-10.1 Exhibit 10.1 March 14, 2023 Orion Group Holdings, Inc. and its Subsidiaries 12000 Aerospace, Suite 300 Houston, Texas 77034 Attention: Peter R. Buchler Re: Consent Letter Ladies and Gentlemen: We refer to that certain Credit Agreement, dated as of August 5, 2015, by and among Orion Group Holdings, Inc. (formerly known as Orion Marine Group, Inc.) (the “Bor

ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS Awarded $448 million contract with the United States Navy as part of joint venture; Year-to-date contract wins total over $582 million Announces three point strategic plan to cont

EXHIBIT 99.1 ORION GROUP HOLDINGS REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS Awarded $448 million contract with the United States Navy as part of joint venture; Year-to-date contract wins total over $582 million Announces three point strategic plan to continuously improve financial performance HOUSTON – March 14, 2023 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading speci

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 14, 2023 ORION GROUP HOLDIN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 14, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2023 ORION GROUP HOLDING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2023 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

ORN / Orion Marine Group, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6 )* Orion Group Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which th

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): November 17, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of inc

ORION GROUP HOLDINGS, INC. ANNOUNCES THE APPOINTMENT OF TRAVIS J. BOONE TO THE BOARD OF DIRECTORS

? ? ? ? ORION GROUP HOLDINGS, INC. ANNOUNCES THE APPOINTMENT OF TRAVIS J. BOONE TO THE BOARD OF DIRECTORS ? HOUSTON ? November 21, 2022 ? Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today announced the appointment of Travis J. Boone to the Board of Directors. ? As previously announced, Mr. Boone, was named President and Chief Executive Officer,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): October 26, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of inco

ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2022 RESULTS

Exhibit 99.1 ? ? ? ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2022 RESULTS ? HOUSTON ? October 26, 2022 ? Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported net income of $0.2 million ($0.01 diluted earnings per share) for the third quarter ended September 30, 2022. Excluding non-recurring items, adjusted net income was $0.8 milli

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): August 29, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incor

Starting Salary: $8,173.07 per week ($425,000 annualized)

DocuSign Envelope ID: 92250578-48D4-4750-B844-6BEA8AB27071 ? ? ? ? August 29, 2022 ? ? ? Gordon Scott Thanisch ? ? ? Subject: Employment Offer ? ? ? Dear Scott, ? We are pleased to offer you the position of Executive Vice President, Chief Financial Officer and Treasurer at Orion Group Holdings, Inc.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): August 15, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incor

Starting Salary: $14,423.07 per week ($750,000 annualized)

DocuSign Envelope ID: CDF7B8CB-9FA9-4DC1-8D3E-D13ACF63E8B4 DocuSign Envelope ID: AC4E653E-809B-4237-9764-46E6C75A3DDB ? ? Exhibit 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): July 27, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2022 RESULTS

Exhibit 99.1 ? ? ? ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2022 RESULTS ? HOUSTON ? July 27, 2022 ? Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported a net loss of $3.1 million ($0.10 diluted loss per share) for the second quarter ended June 30, 2022. Excluding non-recurring items, adjusted net loss was $0.9 million ($0.03 di

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K/A (Amendment No. 1) ? CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): April 6, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other j

As filed with the Securities and Exchange Commission on June 2, 2022

As filed with the Securities and Exchange Commission on June 2, 2022 Registration No.

As filed with the Securities and Exchange Commission on June 2, 2022

As filed with the Securities and Exchange Commission on June 2, 2022 Registration No.

Filing Fee Table

Exhibit 107 ? Calculation of Filing Fee Tables Form S-8 (Form Type) ? Orion Group Holdings, Inc.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): May 19, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpor

ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN

Exhibit 10.1 ? ? ? ? ? ORION GROUP HOLDINGS, INC. 2022 LONG-TERM INCENTIVE PLAN ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? TABLE OF CONTENTS 1. Purpose 1 2. Definitions 1 3. Administration 5 (a) Authority of the Committee 5 (b) Manner of Exercise of Committee Authority 6 (c) Limitation of Liability 6 4. Stock Subject to Plan 6 (a) Overall Number of Shares Available for

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): April 27, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorp

ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2022 RESULTS

Exhibit 99.1 ? ? ? ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2022 RESULTS ? HOUSTON ? April 27, 2022 ? Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported a net loss of $4.9 million ($0.16 diluted loss per share) for the first quarter ended March 31, 2022. Excluding non-recurring items, adjusted net loss was $3.2 million ($0.10 di

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): April 6, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

Separation and General Release Agreement

Exhibit 10.2 Separation and General Release Agreement ? This Separation and General Release Agreement (?Agreement?), is entered into on the date this Agreement becomes effective, between Mark R. Stauffer (?You? or ?Your?) and Orion Group Holdings, Inc. (the ?Company?). The Parties agree that this Agreement represents the full and complete agreement concerning all matters between them (except as ot

Orion Group Holdings Names Austin J. Shanfelter Interim Chief Executive Officer Mark R. Stauffer to Step Down as President and CEO Company Reaffirms Previously Stated Financial Guidance

Exhibit 99.1 Orion Group Holdings Names Austin J. Shanfelter Interim Chief Executive Officer ? Mark R. Stauffer to Step Down as President and CEO ? Company Reaffirms Previously Stated Financial Guidance ? HOUSTON ? April 7, 2022 ? Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today announced that Austin J. Shanfelter, Chairman of the Board of Dir

CONSULTING AGREEMENT

Exhibit 10.1 CONSULTING AGREEMENT ? This CONSULTING AGREEMENT (this ?Agreement?) is entered into effective as of April 6, 2022 (the ?Effective Date?), by and between Orion Group Holding, Inc., a Delaware corporation (?Company?) and Mark R. Stauffer (?Consultant?). ? The parties agree as follows: ? 1.Consulting Period The term of this Agreement shall commence on the Effective Date and shall continu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION ? PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 ? ? Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary proxy statement ? Definitive proxy

Proxy Statement on Schedule 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 ? Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary proxy statement ? Conf

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K/A CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): January 21, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of in

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K/A CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): January 21, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of in

21 .1

Exhibit 21.1 ? ? LIST OF CORPORATE ENTITIES (UPDATED 2/8/22) ? ? Entity Abbreviation State/Province Owner Interest Orion Group Holdings, Inc. ORN DE Parent Company n/a OAS Orion Administrative Services, Inc. OAS TX ORN 100% East & West Jones Placement Areas, LLC EWJ TX OAS 100% Preferred Tool Services, Inc. PTS/HITS TX OAS 100% Orion Marine Group, LLC OMGLLC TX OAS 100% OMR Orion Marine Contractor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

NINTH AMENDMENT TO CREDIT AGREEMENT

Exhibit 10.31 Execution Version ? NINTH AMENDMENT TO CREDIT AGREEMENT ? THIS NINTH AMENDMENT TO CREDIT AGREEMENT (this ?Amendment?), is made and entered into as of March 1, 2022, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Orion Marine Group, Inc.) (the ?Borrower?), certain Subsidiaries of the Borrower designated as ?Guarantors? on the signature pages hereof

ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS

Exhibit 99.1 ? ? ? ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS ? Houston, Texas, Wednesday, March 2, 2022 - Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported a net loss of $8.8 million ($0.29 diluted loss per share) for the fourth quarter ended December 31, 2021. Fourth quarter highlights are discussed

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): March 2, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

ORN / Orion Marine Group, Inc. / Russell Investments Group, Ltd. - ORION GROUP HOLDINGS INC. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3) * Orion Group Holdings, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

ORN / Orion Marine Group, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5 )* Orion Group Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which th

Orion Group Holdings, Inc. Announces Board of Director Changes New Director Appointed; One Director Announces Retirement

? Exhibit 99.1 ? ? Orion Group Holdings, Inc. Announces Board of Director Changes New Director Appointed; One Director Announces Retirement ? HOUSTON, January 25, 2022 Orion Group Holdings, Inc. (NYSE: ORN) (the "Company") a leading specialty construction company, today announced the appointment of Quentin P. Smith, Jr. to the Board of Directors, as well as the retirement of Richard L. Daerr, Jr.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): January 21, 2022 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of inco

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): October 27, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of inco

ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2021 RESULTS; SIGNIFICANT INCREASE IN BACKLOG

? ? ? ? ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2021 RESULTS; SIGNIFICANT INCREASE IN BACKLOG ? Houston, Texas, Wednesday, October 27, 2021 - Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported a net loss of $10.2 million ($0.33 diluted loss per share) for the third quarter ended September 30, 2021. ? Third Quarter 2021 Highligh

Orion Group Holdings, Inc. Announces Chief Financial Officer Change

? Exhibit 99.1 ? ? Orion Group Holdings, Inc. Announces Chief Financial Officer Change ? HOUSTON, October 11, 2021 Orion Group Holdings, Inc. (NYSE: ORN) (the "Company") a leading specialty construction company, today announced Robert L. Tabb will step down as Executive Vice President and Chief Financial Officer effective October 29, 2021, to pursue a new opportunity with a private company that is

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 5, 2021 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2021 RESULTS

Exhibit 99.1 ? ? ? ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2021 RESULTS ? Houston, Texas, Wednesday, July 28, 2021 - Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported net income of $3.5 million ($0.11 diluted earnings per share) for the second quarter ended June 30, 2021. ? Second Quarter 2021 Highlights ? ?Operating income w

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): July 28, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

Fourth Amendment to EMPLOYMENT AGREEMENT PETER R. BUCHLER

Exhibit 10.2 Fourth Amendment to EMPLOYMENT AGREEMENT ???????????PETER R. BUCHLER ????????????????? This Fourth Amendment, entered into effective June 30, 2021, (this ?Amendment?) to that certain EMPLOYMENT AGREEMENT, dated January1, 2015, as amended by the First Amendment, dated March 30, 2017, the Second Amendment, dated June 5, 2018 and the Third Amendment, dated June 04, 2019 (collectively, th

Fourth Amendment to EMPLOYMENT AGREEMENT MARK R. STAUFFER

Exhibit 10.1 Fourth Amendment to EMPLOYMENT AGREEMENT ???????????MARK R. STAUFFER ????????????????? This Fourth Amendment, entered into effective June 30, 2021, (this ?Amendment?) to that certain EMPLOYMENT AGREEMENT, dated January1, 2015, as amended by the First Amendment, dated January 1, 2017, the Second Amendment, dated June 5, 2018 and the Third Amendment, dated June 19, 2019 (collectively, t

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): June 30, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

Submission of Matters to a Vote of Security Holders

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): May 20, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpor

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): April 28, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorp

Quarterly Report - 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2021 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2021 RESULTS Houston, Texas, Wednesday, April 28, 2021 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported net income of $0.9 million ($0.03 diluted earnings per share) for the first quarter ended March 31, 2021. First Quarter 2021 Highlights ●Operating income was $2.1 milli

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION ? PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 ? ? Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary proxy statement ? Definitive proxy

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary proxy statement ? Definitive proxy stateme

Financial Statements and Exhibits, Other Events

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): March 2, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of incorpo

Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Ori

Exhibit 99.1 ? ? ? Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this ?Amendment?), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Orion Marine Group, Inc.) (the ?Borrower?), certain Subsidiaries of the Borrower designated as ?Guarantors? on the signature pages her

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

21 .1

Exhibit 21.1 ? ? LIST OF CORPORATE ENTITIES (UPDATED 02/22/21) ? ENTITY ABBREVIATION STATE/PROVINCE OWNER INTEREST Orion Group Holdings, Inc. ORN DE Parent Company n/a Orion Administrative Services, Inc. OAS TX ORN 100% ? East & West Jones Placement Areas, LLC EWJ TX OAS 100% ? Preferred Tool Services, Inc. PTS/HITS TX OAS 100% ? Orion Marine Group, LLC OMGLLC TX OAS 100% Orion Marine Contractors,

Financial Statements and Exhibits, Results of Operations and Financial Condition

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K CURRENT REPORT ? Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): February 24, 2021 ? ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) ? ? ? ? Delaware 1-33891 26-0097459 (State or other jurisdiction of inc

ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2020 RESULTS

? ? ? Exhibit 99.1 ? ? ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2020 RESULTS ? Houston, Texas, Wednesday, February 24, 2021 - Orion Group Holdings, Inc. (NYSE: ORN) (the ?Company?), a leading specialty construction company, today reported net income of $3.7 million ($0.12 diluted earnings per share) for the fourth quarter ended December 31, 2020. Fourth quarter highlights ar

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4 )* Orion Group Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which th

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 14, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Ori

Exhibit 99.2 Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Orion Marine Group, Inc.) (the “Borrower”), certain Subsidiaries of the Borrower designated as “Guarantors” on the signature pages hereof (t

10b5-1 Option Exercise and Sales Plan

Exhibit 99.1 10b5-1 Option Exercise and Sales Plan This 10b5-l Option Exercise and Sales Plan is entered into on December 14, 2020 (the "Plan"), between Mark R. Stauffer ("Stauffer") and Stephens Inc. (the "Broker"). WHEREAS, Stauffer desires to establish this Plan for the purpose of selling shares of the common stock (the "Common Stock") of Orion Group Holdings, Inc. (the "Company"), and effectin

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 28, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2020 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2020 RESULTS Houston, Texas, Wednesday, October 28, 2020 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported net income of $11.8 million ($0.39 diluted earnings per share) for the third quarter ended September 30, 2020. Third quarter highlights are discussed below. Third Qua

Entry into a Material Definitive Agreement, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 9, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissio

Eighth amendment, effective October 9, 2020, to the Credit Agreement dated as of August 5, 2015 among Orion Marine Group, Inc. as Borrower, Certain Subsidiaries of the Borrower Party Hereto From Time to Time, as Guarantors, the Lenders Party Hereto, Regions Bank, as Administrative Agent and Collateral Agent, and Bank of America, N.A., BOKF, NA dba Bank of Texas, Iberiabank, NBH Bank, Truist Bank, and Trustmark National Bank, as Lenders.

Exhibit 10.1 Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Orion Marine Group, Inc.) (the “Borrower”), certain Subsidiaries of the Borrower designated as “Guarantors” on the signature pages hereof (t

Orion Group Holdings, Inc. Makes Statement on Dredge Accident

EX-99.1 2 orn-20200824ex99107943f.htm EX-99.1 Exhibit 99.1 Orion Group Holdings, Inc. Makes Statement on Dredge Accident HOUSTON, August 24, 2020 Orion Group Holdings, Inc. (NYSE: ORN) (the "Company") a leading specialty construction company, today provided an update on the explosion and fire in the Port of Corpus Christi involving its dredge Waymon Boyd. On Friday morning a fire occurred in the P

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 24, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissio

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1-

ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2020 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2020 RESULTS Houston, Texas, Wednesday, July 29, 2020 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported net income of $2.0 million ($0.07 diluted earnings per share) for the second quarter ended June 30, 2020. Second quarter highlights are discussed below. Second Quarter

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

ORN / Orion Marine Group, Inc. / Russell Investments Group, Ltd. - ORION GROUP HOLDINGS INC. Passive Investment

Orion Group Holdings Inc. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Orion Group Holdings Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) June 30, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rul

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 8, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of (Commission File Number) (IR

Orion Group Holdings, Inc. Announces Additional $20 Million Revolver

Exhibit 99.1 Orion Group Holdings, Inc. Announces Additional $20 Million Revolver HOUSTON, June 8, 2020 Orion Group Holdings, Inc. (NYSE: ORN) (the "Company") a leading specialty construction company, today announced it has entered into an amendment to its existing credit agreement with Regions Bank and other lenders, providing for a new $20 million revolving credit facility to supplement its exis

Seventh amendment, effective June 8, 2020, to the Credit Agreement dated as of August 5, 2015 among Orion Marine Group, Inc. as Borrower, Certain Subsidiaries of the Borrower Party Hereto From Time to Time, as Guarantors, the Lenders Party Hereto, Regions Bank, as Administrative Agent and Collateral Agent, and Bank of America, N.A., BOKF, NA dba Bank of Texas, Iberia Bank, Trust Bank, and Trustmark National Bank, as Lenders.

Exhibit 10.1 Execution Version SEVENTH AMENDMENT TO CREDIT AGREEMENT THIS SEVENTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of June 8, 2020, by and among ORION GROUP HOLDINGS, INC., a Delaware corporation (formerly known as Orion Marine Group, Inc.) (the “Borrower”), certain Subsidiaries of the Borrower designated as “Guarantors” on the signature pages hereof (t

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2020 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2020 RESULTS Houston, Texas, Wednesday, April 29, 2020 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported net income of $2.7 million ($0.09 diluted earnings per share) for the first quarter ended March 31, 2020. First quarter highlights are discussed below. First Quarter 20

ORN / Orion Marine Group, Inc. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Definitive proxy stateme

ORN / Orion Marine Group, Inc. DEF 14A - - DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a‑101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☒ Definitive proxy stateme

21 .1

Exhibit 21.1 LIST OF CORPORATE ENTITIES (UPDATED 02/25/20) ENTITY ABBREVIATION STATE/PROVINCE OWNER INTEREST Orion Group Holdings, Inc. ORN DE Parent Company n/a Orion Administrative Services, Inc. OAS TX ORN 100% East & West Jones Placement Areas, LLC EWJ TX OAS 100% Preferred Tool Services, Inc. PTS/HITS TX OAS 100% Orion Marine Group, LLC OMGLLC TX OAS 100% Orion Marine Contractors, Inc. OMR DE

ORN / Orion Marine Group, Inc. 10-K - Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 1‑3389

Description of Registered Securities of Orion Group Holdings, Inc. (Incorporated herein by reference to Exhibit 4.1 to the Company’s Annual Report on Form 10-K filed with the Securities Exchange Commission on March 28, 2020 (File No. 001-338911)).

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of December 31, 2019, Orion Group Holdings, Inc. (the “Company,” “we,” “us” or “our”) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: our common stock, par value $0.01 per share (our “Common Stock”). The follo

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2019 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2019 RESULTS Houston, Texas, Wednesday, February 26, 2020 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported a net income of $0.2 million ($0.01 diluted earnings per share) for the fourth quarter ended December 31, 2019. Fourth quarter highlights are discusse

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 20, 2020 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commiss

Orion Group Holdings Inc. Announces Interim Chief Operating Officer Will Conclude Role Effective February 29, 2020

Exhibit 99.1 Orion Group Holdings Inc. Announces Interim Chief Operating Officer Will Conclude Role Effective February 29, 2020 HOUSTON, February 20, 2020 (GLOBE NEWSWIRE) - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”) a leading specialty construction company, today announced Mr. Austin Shanfelter will conclude his role as Interim Chief Operating Officer effective February 29, 2020. Mr.

ORN / Orion Marine Group, Inc. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* ORION GROUP HOLDINGS INC (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which thi

ORN / Orion Marine Group, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)* Name of issuer: Orion Group Holdings Inc Title of Class of Securities: Common Stock CUSIP Number: 68628V308 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

ORN / Orion Marine Group, Inc. / Boston Partners - ROBECO INVESTMENT MANAGEMENT INC. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6)* ORION GROUP HOLDINGS, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) February 10, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

ORN / Orion Marine Group, Inc. / Invesco Ltd. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Orion Group Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which th

ORN / Orion Marine Group, Inc. 144 - - FORM 144

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0101 Washington, D.

ORN / Orion Marine Group, Inc. / Palogic Value Management, L.P. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* ORION GROUP HOLDINGS, INC. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 68628V308 (CUSIP Number) Palogic Value Management, L.P. Attn: Ryan L. Vardeman 5310 Harvest Hill Road, Suite 110 Dallas, TX 75230 (214) 871-

ORN / Orion Marine Group, Inc. / Russell Investments Group, Ltd. - FORM SC 13G/A Passive Investment

Form SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) * Orion Group Holdings Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 68628V308 (CUSIP Number) October 31, 2019 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursua

ORN / Orion Marine Group, Inc. 10-Q - Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ◻ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Numbe

ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2019 RESULTS

Exhibit 99.1 ORION GROUP HOLDINGS, INC. REPORTS THIRD QUARTER 2019 RESULTS Houston, Texas, Wednesday, October 30, 2019 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported a net income of $4.0 million ($0.14 diluted earnings per share) for the third quarter ended September 30, 2019. Third quarter highlights are discussed below. Third Qu

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissi

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 17, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commis

Orion Group Holdings, Inc. Announces Board of Director Changes New Director Appointed; One Director Announces Retirement

Orion Group Holdings, Inc. Announces Board of Director Changes New Director Appointed; One Director Announces Retirement HOUSTON, September 17, 2019 Orion Group Holdings, Inc. (NYSE: ORN) (the "Company") a leading specialty construction company, today announced the appointment of Margaret “Peggy” M. Foran to the Board of Directors, as well as the retirement of J. Michael Pearson as a board member.

ORN / Orion Marine Group, Inc. / Palogic Value Management, L.P. - SC 13D/A Activist Investment

SC 13D/A 1 d800831dsc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* ORION GROUP HOLDINGS, INC. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 68628V308 (CUSIP Number) Palogic Value Management, L.P. Attn: Ryan L. Vardeman 5310 Harvest Hill Road, Suite 1

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 12, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commissio

Investor Presentation August 2019 Safe Harbor Statement The matters discussed in this presentation may constitute or include projections or other forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, t

orninvestorpresentation2 Investor Presentation August 2019 Safe Harbor Statement The matters discussed in this presentation may constitute or include projections or other forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, the provisions of which the Company is availing itself.

ORN / Orion Marine Group, Inc. 10-Q - Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 1-33891 ORION GROUP

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2019 RESULTS

ORION GROUP HOLDINGS, INC. REPORTS SECOND QUARTER 2019 RESULTS Houston, Texas, Wednesday, July 31, 2019 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported a net loss of $1.6 million ($0.06 diluted loss per share) for the second quarter ended June 30, 2019. Second quarter highlights are discussed below. Second Quarter 2019 Highlights •

ORN / Orion Marine Group, Inc. / Palogic Value Management, L.P. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* ORION GROUP HOLDINGS, INC. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 68628V308 (CUSIP Number) Palogic Value Management, L.P. Attn: Ryan L. Vardeman 5310 Harvest Hill Road, Suite 110 Dallas, TX 75230 (214) 871-

EMPLOYMENT AGREEMENT Robert L. Tabb

EMPLOYMENT AGREEMENT Robert L. Tabb This EMPLOYMENT AGREEMENT (this "Agreement") is entered into as of June 19, 2019 (the "Effective Date"), by and between Orion Group Holdings, Inc., a Delaware corporation (the "Company"), and Robert L. Tabb (the "Key Employee"). It supersedes and replaces a somewhat similar form of agreement dated September 30, 2015, as amended by the First Amendment, dated Sept

Third Amendment to EMPLOYMENT AGREEMENT PETER R. BUCHLER

Third Amendment to EMPLOYMENT AGREEMENT PETER R. BUCHLER This Third Amendment (this "Amendment") to that certain EMPLOYMENT AGREEMENT, dated as of January 1, 2015, as subsequently amended by the First Amendment dated April 1, 2017 and again by the Second Amendment dated June 5, 2018 (this "Agreement"), is by and between Orion Group Holdings, Inc., a Delaware corporation (the "Company"), and Mr. Pe

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 19, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission

Third Amendment to EMPLOYMENT AGREEMENT MARK R. STAUFFER

Third Amendment to EMPLOYMENT AGREEMENT MARK R. STAUFFER This Third Amendment (this "Amendment") to that certain EMPLOYMENT AGREEMENT, dated as of January 1, 2015, as subsequently amended by the First Amendment dated January 1, 2017 and again by the Second Amendment dated June 5, 2018 (this "Agreement"), is by and between Orion Group Holdings, Inc., a Delaware corporation (the "Company"), and Mr.

JOINT FILING AGREEMENT May 31, 2019

EX-99.1 EXHIBIT 99.1 JOINT FILING AGREEMENT May 31, 2019 Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations thereunder, each party hereto hereby agrees to the joint filing, on behalf of each of them, of any filing required by such party under Section 13 or Section 16 of the Exchange Act or any rule or regulation th

ORN / Orion Marine Group, Inc. / Palogic Value Management, L.P. - SC 13D Activist Investment

SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* ORION GROUP HOLDINGS, INC. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 68628V308 (CUSIP Number) Palogic Value Management, L.P. Attn: Ryan L. Vardeman 5310 Harvest Hill Road, Suite 110 Dallas, TX 75230 (214) 871-270

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 23, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission F

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2019 ORION GROUP HOLDINGS, INC. (Exact name of Registrant as specified in its charter) Delaware 1-33891 26-0097459 (State or other jurisdiction of incorporation) (Commission Fi

ORN / Orion Marine Group, Inc. 10-Q Quarterly Report 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 1-33891 ORION GROUP

Item 1.01 Entry into a Material Definitive Agreement

Execution Version SIXTH AMENDMENT TO CREDIT AGREEMENT THIS SIXTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), is made and entered into as of May 7, 2019, by and among ORION GROUP HOLDINGS, INC.

ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2019 RESULTS

ORION GROUP HOLDINGS, INC. REPORTS FIRST QUARTER 2019 RESULTS Houston, Texas, May 9, 2019 - Orion Group Holdings, Inc. (NYSE: ORN) (the “Company”), a leading specialty construction company, today reported financial results for the first quarter ended March 31, 2019. First quarter highlights are discussed below. First Quarter 2019 Highlights • Contract revenues were $143.1 million, up nearly 5% fro

ORN / Orion Marine Group, Inc. DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary proxy statement ☐ Definitive proxy stateme