SBBP / Strongbridge Biopharma plc - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Strongbridge Biopharma plc
US ˙ NASDAQ ˙ IE00BYZ5XL97
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
LEI 5493001OUCRYIW3XQZ24
CIK 1634432
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Strongbridge Biopharma plc
SEC Filings (Chronological Order)
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February 11, 2022 SC 13G/A

SBBP / Strongbridge Biopharma plc / ORBIMED ADVISORS LLC - AMENDMENT NO. 1 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G (Amendment No.

February 11, 2022 EX-99.A

JOINT FILING AGREEMENT

CUSIP No. G85347105 SCHEDULE 13G Page 8 of 8 Pages EXHIBIT A JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on this Schedule 13G dated February 11, 2022 (the ?Schedule 13G?), with respect to the Common Stock, par value $0.01 per share, of Strongbridge Biopharma plc is filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the

January 5, 2022 SC 13D/A

SBBP / Strongbridge Biopharma plc / CAXTON CORP Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4) Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) G85347105 (CUSIP Number) Mr. Heath N. Weisberg Caxton Corporation 731 Alexander Road, Bldg. 2, Suite 500 Princeton, New Jersey 08540 (212) 205-6805 (Name, Addres

October 25, 2021 SC 13D/A

SBBP / Strongbridge Biopharma plc / Growth Equity Opportunities Fund III, LLC - GROWTH EQUITY OPPORTUNITIES FUND III, LLC (STRONGBRIDGE) - SCHEDULE 13DA3E Activist Investment

Schedule 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $.01 par value (Title of Class of Securities) G85347105 (CUSIP Number) Louis S. Citron, Esq. New Enterprise Associates 1954 Greenspring Drive, Suite 600, Timonium, MD 21093 (410) 8

October 15, 2021 15-12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number 001-37569 STRONGBRIDGE BIOPHARMA PLC (Exact name of registrant as specified

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

S-8 POS 1 tm2127087d7s8pos.htm S-8 POS As filed with the Securities and Exchange Commission on October 5, 2021 Registration No. 333-215532 Registration No. 333-222818 Registration No. 333-225319 Registration No. 333-230931 Registration No. 333-236911 Registration No. 333-255286 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGIST

October 5, 2021 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

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 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (Com

October 5, 2021 POS AM

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 EX-99.1

Strongbridge Biopharma plc Announces Completion of Acquisition by Xeris Pharmaceuticals, Inc.

Exhibit 99.1 Strongbridge Biopharma plc Announces Completion of Acquisition by Xeris Pharmaceuticals, Inc. DUBLIN, Ireland and TREVOSE, Pa., October 5, 2021 ? Strongbridge Biopharma plc (NASDAQ: SBBP) (the ?Company? or ?Strongbridge?) today announced that the High Court of Ireland (the "Court") has approved the previously announced proposed acquisition of Strongbridge by Xeris Pharmaceuticals, Inc

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

S-8 POS 1 tm2127087d11s8pos.htm S-8 POS As filed with the Securities and Exchange Commission on October 5, 2021 Registration No. 333-215532 Registration No. 333-222818 Registration No. 333-225319 Registration No. 333-230931 Registration No. 333-236911 Registration No. 333-255286 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGIS

October 5, 2021 POS AM

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 S-8 POS

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

October 5, 2021 POS AM

As filed with the Securities and Exchange Commission on October 5, 2021

As filed with the Securities and Exchange Commission on October 5, 2021 Registration No.

September 13, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

425 Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933, as amended and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: September 13, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbr

September 8, 2021 EX-99.1

Strongbridge Biopharma plc Announces Shareholder Approval of Proposed Acquisition by Xeris Pharmaceuticals, Inc.

Exhibit 99.1 Strongbridge Biopharma plc Announces Shareholder Approval of Proposed Acquisition by Xeris Pharmaceuticals, Inc. DUBLIN, Ireland and TREVOSE, Pa., September 8, 2021 ? Strongbridge Biopharma plc (NASDAQ: SBBP) (the ?Company? or ?Strongbridge?) today announced that its shareholders have voted to approve the previously announced proposed acquisition of Strongbridge by Xeris Pharmaceutica

September 8, 2021 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): September 8, 2021 STRONGBRIDGE BI

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 8, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (C

August 31, 2021 425

Second Leading Independent Proxy Advisory Firm Glass Lewis Recommends Strongbridge Biopharma plc Shareholders Vote “FOR” the Transaction With Xeris Glass Lewis Joins ISS in Recommending Strongbridge Shareholders Vote “FOR” Transaction with Xeris Stro

Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569) Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc S-4 Commission File No.: 333-257642 Second Leading Independent Proxy Advisory Firm Glass Lewis Recommends Strongbridge Biophar

August 30, 2021 425

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 30, 2021 STRONGBRIDGE BIOP

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 30, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (Com

August 30, 2021 425

XERIS PHARMACEUTICALS ANNOUNCES LEADING INDEPENDENT PROXY ADVISORY FIRM, ISS, RECOMMENDS XERIS STOCKHOLDERS VOTE “FOR” THE TRANSACTION WITH STRONGBRIDGE BIOPHARMA Urges stockholders to vote “FOR” all transaction-related proposals at the Xeris special

425 Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933, as amended and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: August 30, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbridg

August 30, 2021 8-K

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 30, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (Com

August 30, 2021 425

Leading Independent Proxy Advisory Firm ISS Recommends Strongbridge Biopharma plc Shareholders Vote “FOR” the Transaction With Xeris Strongbridge Urges Shareholders to Vote “FOR” All Transaction-Related Proposals

Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569) Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc S-4 Commission File No.: 333-257642 Leading Independent Proxy Advisory Firm ISS Recommends Strongbridge Biopharma plc Sharehol

August 30, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

425 Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933, as amended and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: August 30, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbridg

August 26, 2021 425

Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569)

425 1 tm2123834d3425.htm 425 Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569) Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc S-4 Commission File No.: 333-257642 Email from Strongbridge’s Chief Financial Officer and Chief E

August 26, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933, as amended and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: August 26, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbridge Bi

August 12, 2021 425

2

Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569) Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc S-4 Commission File No.: 333-257642 Form of Email to Strongbridge Shareholders Good morning [?], I hope this email finds you d

August 6, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: August 6, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbridge Biopharma plc by Xeris Phar

August 5, 2021 8-K

Regulation FD Disclosure, 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): August 5, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commissio

August 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2021 ☐ TRANSITION REPORT PURSUANT TO S

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

August 5, 2021 EX-99.1

Strongbridge Biopharma plc Reports Second Quarter 2021 Financial Results and Provides Corporate Update ~ Reports KEVEYIS® (dichlorphenamide) Second Quarter 2021 Revenue of $10.0 Million, a 28 Percent Increase Compared to $7.8 Million of Revenue Durin

Exhibit 99.1 ? ? Strongbridge Biopharma plc Reports Second Quarter 2021 Financial Results and Provides Corporate Update ? ~ Reports KEVEYIS? (dichlorphenamide) Second Quarter 2021 Revenue of $10.0 Million, a 28 Percent Increase Compared to $7.8 Million of Revenue During Second Quarter of 2020 ~ ? ~ Strongbridge Remains On-Track to Meet, or Potentially Exceed, the Top End of Full-Year 2021 KEVEYIS

August 5, 2021 425

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 5, 2021 STRONGBRIDGE BIOPH

425 1 sbbp-20210805x425.htm 425 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 5, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdict

August 5, 2021 EX-99.1

Strongbridge Biopharma plc Reports Second Quarter 2021 Financial Results and Provides Corporate Update ~ Reports KEVEYIS® (dichlorphenamide) Second Quarter 2021 Revenue of $10.0 Million, a 28 Percent Increase Compared to $7.8 Million of Revenue Durin

Exhibit 99.1 ? ? Strongbridge Biopharma plc Reports Second Quarter 2021 Financial Results and Provides Corporate Update ? ~ Reports KEVEYIS? (dichlorphenamide) Second Quarter 2021 Revenue of $10.0 Million, a 28 Percent Increase Compared to $7.8 Million of Revenue During Second Quarter of 2020 ~ ? ~ Strongbridge Remains On-Track to Meet, or Potentially Exceed, the Top End of Full-Year 2021 KEVEYIS

August 2, 2021 425

Strongbridge Biopharma plc Announces Commencement of Mailing of Proxy Statement

Filed by Strongbridge Biopharma plc (Commission File No.: 001-37569) Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc S-4 Commission File No.: 333-257642 Strongbridge Biopharma plc Announces Commencement of Mailing of Proxy Statement DUBLIN, Ir

July 29, 2021 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a

July 26, 2021 EX-2.1

First Amendment to Term Loan Agreement, dated July 23, 2021, among Strongbridge Biopharma plc, Strongbridge U.S., Inc. and Avenue Venture Opportunities Fund, L.P.

Exhibit 2.1 FIRST AMENDMENT TO TERM LOAN AGREEMENT This FIRST AMENDMENT TO TERM LOAN AGREEMENT, dated as of July 23, 2021 (this ?Amendment?), is entered into by and among Strongbridge U.S. Inc., a Delaware corporation (the ?Borrower?), Strongbridge Biopharma plc, a public limited company incorporated under the laws of Ireland (the ?Parent Guarantor?), each Lender party hereto designated as a ?Lend

July 26, 2021 EX-2.2

Lock-Up Agreement, dated July 23, 2021, between Avenue Venture Opportunities Fund, L.P. and Strongbridge Biopharma plc

Exhibit 2.2 Lock-Up Agreement July 23, 2021 Avenue Venture Opportunities Fund, L.P., in its capacity as a Lender under the Existing Credit Agreement referred to below 11 W. 42nd St., 9th Floor New York, NY 10036 Ladies and Gentlemen: This Lock-Up Agreement is being delivered to you in connection with the proposed First Amendment to Term Loan Agreement (the ?Amendment?), entered into among Strongbr

July 26, 2021 425

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 23, 2021 STRONGBRIDGE BIOPHA

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 23, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation or organizat

July 26, 2021 EX-99.1

Strongbridge Biopharma plc Announces Dates of Special Shareholder Meetings in Connection with the Proposed Acquisition by Xeris Pharmaceuticals, Inc.

Exhibit 99.1 Strongbridge Biopharma plc Announces Dates of Special Shareholder Meetings in Connection with the Proposed Acquisition by Xeris Pharmaceuticals, Inc. DUBLIN, Ireland and TREVOSE, Pa., July 26, 2021 ? Strongbridge Biopharma plc (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with signifi

July 26, 2021 8-K

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): July 23, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation or organizat

July 9, 2021 SC 13G

SBBP / Strongbridge Biopharma plc / Stonepine Capital Management, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) July 2, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the

July 7, 2021 425

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, 2021 STRONGBRIDGE BIOPHAR

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, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (Commis

July 7, 2021 8-K

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): July 2, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 001-37569 (Commis

June 25, 2021 CORRESP

June 25, 2021

June 25, 2021 By EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549-4561 Attention: Jenn Do and Kevin Vaughn Re: Strongbridge Biopharma plc Form 10-K for the fiscal year ended December 31, 2020 Filed March 3, 2021 File No.

May 25, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: May 24, 2021 The following communication is a transcript of a conference call held on May 24, 2021 and is being filed in connection with the prop

May 24, 2021 EX-99.3

The announcement issued jointly by Xeris and Strongbridge under Rule 2.5 of the Irish Takeover Rules on May 24, 2021 (the “Rule 2.5 Announcement”) is available on Xeris’ website at www.xerispharma.com and on Strongbridge’s website at www.strongbridge

Xeris to Acquire Strongbridge Creating an Innovative Leader in Endocrinology and Rare Diseases May 24, 2021 Exhibit 99.

May 24, 2021 8-K

Regulation FD Disclosure, 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): May 24, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation or organizati

May 24, 2021 EX-99.7

Strongbridge Transaction Patient Letter

Exhibit 99.7 Strongbridge Transaction Patient Letter Dear [Valued Patient / INSERT CUSTOMARY GREETING], I am pleased to share some exciting news about the future of Strongbridge. This morning, we announced that Xeris Pharmaceuticals will acquire Strongbridge to create an innovative leader in endocrinology and rare diseases. As you know, at Strongbridge we are driven by our mission to build a stron

May 24, 2021 EX-2.1

Transaction Agreement, dated as of May 24, 2021, by and among Xeris Pharmaceuticals, Inc., Strongbridge Biopharma plc, Xeris Biopharma Holdings, Inc. and Wells MergerSub, Inc.

Exhibit 2.1 DATED MAY 24, 2021 STRONGBRIDGE BIOPHARMA PLC, XERIS PHARMACEUTICALS, INC., XERIS BIOPHARMA HOLDINGS, INC. AND WELLS MERGERSUB, INC. TRANSACTION AGREEMENT CONTENTS 1. INTERPRETATION 1 1.1??Definitions 1 1.2??Construction 20 1.3??Captions 20 1.4??Time 21 2. RULE 2.5 ANNOUNCEMENT, SCHEME DOCUMENT AND STRONGBRIDGE RULE 15 PROPOSALS 21 2.1??Rule 2.5 Announcement 21 2.2??Scheme 22 2.3??Chan

May 24, 2021 EX-10.1

Form of Irrevocable Undertaking.

Exhibit 10.1 DEED OF IRREVOCABLE UNDERTAKING To: Xeris Pharmaceuticals, Inc. (?Xeris?) Xeris Biopharma Holdings, Inc. (?Holdco?) [ ] May 2021 Dear Sirs PROPOSED ACQUISITION OF STRONGBRIDGE BY HOLDCO, AN AFFILIATED COMPANY OF XERIS I refer to the proposed acquisition of Strongbridge Biopharma plc (the ?Company?) by Holdco, a newly incorporated company and affiliate of Xeris. Under the proposed tran

May 24, 2021 EX-99.2

XERIS PHARMACEUTICALS, INC. TO ACQUIRE STRONGBRIDGE BIOPHARMA PLC IN STOCK AND CVR TRANSACTION, CREATING AN INNOVATIVE LEADER IN ENDOCRINOLOGY AND RARE DISEASES Transaction Creates Fast-Growing Biopharmaceutical Company with Two Commercial Assets and

Exhibit 99.2 XERIS PHARMACEUTICALS, INC. TO ACQUIRE STRONGBRIDGE BIOPHARMA PLC IN STOCK AND CVR TRANSACTION, CREATING AN INNOVATIVE LEADER IN ENDOCRINOLOGY AND RARE DISEASES Transaction Creates Fast-Growing Biopharmaceutical Company with Two Commercial Assets and Robust Clinical Pipeline with Multiple Near-term Inflection Points Diversifies Revenue Base with Two Rapidly Growing Brands in Xeris? Gv

May 24, 2021 425

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 24, 2021 STRONGBRIDGE BIOPHAR

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 24, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation or organizati

May 24, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: May 24, 2021 The following communication is being filed in connection with the proposed acquisition of Strongbridge Biopharma plc by Xeris Pharma

May 24, 2021 EX-99.5

Strongbridge Transaction Employee Letter

Exhibit 99.5 Strongbridge Transaction Employee Letter **Confidential ? For Internal Strongbridge Biopharma Use Only** Dear Colleagues, Today is an exciting day for Strongbridge and I wanted to share our news with you personally. Moments ago, we announced Xeris Pharmaceuticals will acquire Strongbridge in a transaction that values Strongbridge at approximately $267 million. This combination marks a

May 24, 2021 EX-99.8

Strongbridge Transaction Partner / Vendor Letter

Exhibit 99.8 Strongbridge Transaction Partner / Vendor Letter Dear [Valued Partner / INSERT CUSTOMARY GREETING], I am pleased to share some exciting news about the future of Strongbridge. Today, we announced that Xeris Pharmaceuticals will acquire Strongbridge to create an innovative leader in endocrinology and rare diseases. We are taking this step because it will provide us with an opportunity t

May 24, 2021 EX-99.6

Strongbridge Transaction Physician / KOL / Patient Advocacy Group Letter

Exhibit 99.6 Strongbridge Transaction Physician / KOL / Patient Advocacy Group Letter **Confidential ? For Internal Strongbridge Biopharma Use Only** Dear INSERT, I wanted to reach out to you directly to share some exciting news about the future of Strongbridge given your very important role as [a/an advocacy leader, healthcare practitioner, investigator]. Today, we announced that Xeris Pharmaceut

May 24, 2021 EX-99.1

XERIS PHARMACEUTICALS, INC. TO ACQUIRE STRONGBRIDGE BIOPHARMA PLC IN STOCK AND CVR TRANSACTION, CREATING AN INNOVATIVE LEADER IN ENDOCRINOLOGY AND RARE DISEASES Transaction Creates Fast-Growing Biopharmaceutical Company with Two Commercial Assets and

Exhibit 99.1 NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF SUCH JURISDICTION THIS ANNOUNCEMENT IS BEING MADE PURSUANT TO RULE 2.5 OF THE IRISH TAKEOVER RULES FOR IMMEDIATE RELEASE XERIS PHARMACEUTICALS, INC. TO ACQUIRE STRONGBRIDGE BIOPHARMA PLC IN STOCK AND CVR

May 24, 2021 EX-2.3

Expenses Reimbursement Agreement, dated as of May 24, 2021 by and between Xeris Pharmaceuticals, Inc. and Strongbridge Biopharma plc.

Exhibit 2.3 EXECUTION VERSION Dated May 24, 2021 XERIS PHARMACEUTICALS, INC. STRONGBRIDGE BIOPHARMA PLC EXPENSES REIMBURSEMENT AGREEMENT TABLE OF CONTENTS 1 Definitions 1 2 Pre-condition 6 3 Xeris reimbursement 6 4 General 8 EXPENSES REIMBURSEMENT AGREEMENT THIS EXPENSES REIMBURSEMENT AGREEMENT (this Agreement), dated as of May 24, 2021 and made between: (1) XERIS PHARMACEUTICALS, INC., a Delaware

May 24, 2021 425

Filed by Xeris Pharmaceuticals, Inc.

Filed by Xeris Pharmaceuticals, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Strongbridge Biopharma plc Commission File No.: 001-37569 Date: May 24, 2021 Xeris Pharmaceuticals, Inc. (?Xeris?) is using or making available the following communications through the website www.xerisstrongb

May 24, 2021 425

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 24, 2021 XERIS PHARMACEUTICAL

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 24, 2021 XERIS PHARMACEUTICALS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38536 20-3352427 (State or other jurisdiction of incorporation) (Commissio

May 24, 2021 EX-2.2

Appendix III to the Rule 2.5 Announcement (Conditions Appendix).

Exhibit 2.2 APPENDIX III CONDITIONS OF THE ACQUISITION AND THE SCHEME The Acquisition and the Scheme will comply with the Takeover Rules, the Act and, where relevant, the rules and regulations of the Exchange Act and Nasdaq, and are subject to the terms and conditions set out in this announcement and to be set out in the Scheme Document. The Acquisition and the Scheme are, to the extent required b

May 24, 2021 EX-99.4

The announcement issued jointly by Xeris and Strongbridge under Rule 2.5 of the Irish Takeover Rules on May 24, 2021 (the “

Exhibit 99.4 The announcement issued jointly by Xeris and Strongbridge under Rule 2.5 of the Irish Takeover Rules on May 24, 2021 (the ?Rule 2.5 Announcement?) is available on Xeris? website at www.xerispharma.com and on Strongbridge?s website at www.strongbridgebio.com. Appendix I to the Rule 2.5 Announcement contains further details of the sources of information and bases of calculations set out

May 24, 2021 425

Filed by Strongbridge Biopharma plc

Filed by Strongbridge Biopharma plc Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Strongbridge Biopharma plc Commission File No.

May 14, 2021 8-K

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 13, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 13, 2021 EX-99.1

Strongbridge Biopharma plc Announces U.S. Food & Drug Administration (FDA) Filing Acceptance of New Drug Application (NDA) for RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome ~ FDA Sets Prescription Drug User Fee Act (

Exhibit 99.1 ? Strongbridge Biopharma plc Announces U.S. Food & Drug Administration (FDA) Filing Acceptance of New Drug Application (NDA) for RECORLEV? (levoketoconazole) for the Treatment of Endogenous Cushing?s Syndrome ? ~ FDA Sets Prescription Drug User Fee Act (PDUFA) Target Action Date of January 1, 2022 ~ ? ~ If Approved, RECORLEV? (levoketoconazole) Launch Planned for First Quarter of 2022

May 13, 2021 8-K

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): May 13, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commission

May 12, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended March 31, 2021 ☐ TRANSITION REPORT PURSUANT TO

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

May 12, 2021 8-K

Regulation FD Disclosure, 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 12, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commission

May 12, 2021 EX-99.1

Strongbridge Biopharma plc Reports First Quarter 2021 Financial Results and Provides Corporate Update ~ Reports KEVEYIS® (dichlorphenamide) First Quarter 2021 Revenue of $8.4 Million, a 25 Percent Increase Compared to $6.7 Million of Revenue During F

Exhibit 99.1 ? ? Strongbridge Biopharma plc Reports First Quarter 2021 Financial Results and Provides Corporate Update ? ~ Reports KEVEYIS? (dichlorphenamide) First Quarter 2021 Revenue of $8.4 Million, a 25 Percent Increase Compared to $6.7 Million of Revenue During First Quarter of 2020 ~ ? ~ Reiterates Full-Year 2021 KEVEYIS? (dichlorphenamide) Revenue Guidance of Approximately $34 Million to $

April 16, 2021 S-8

- S-8

As filed with the Securities and Exchange Commission on April 16, 2021 Registration Number 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

April 14, 2021 DEF 14A

Definitive Proxy

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

March 30, 2021 CORRESP

-

CORRESP 1 filename1.htm 900 Northbrook Drive Suite 200 Trevose, PA 19053 (610) 254-9022 March 31, 2021 VIA EDGAR United States Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Attention: Jane Park Re: Strongbridge Biopharma plc – Request for Acceleration Registration Statement on Form S-3 File No. 333- 254733 Ladies and Gentlemen: Pursuant to Rule 461 promulgated under th

March 26, 2021 EX-1.2

Open Market Sale Agreement℠, dated March 25, 2021, by and between Strongbridge Biopharma plc and Jefferies LLC

Exhibit 1.2 Execution Version OPEN MARKET SALE AGREEMENTSM March 25, 2021 JEFFERIES LLC 520 Madison Avenue New York, New York 10022 Ladies and Gentlemen: Strongbridge Biopharma plc, an Irish public limited company (registered no. 562659) (the ?Company?), proposes, subject to the terms and conditions stated herein, to issue and sell from time to time through Jefferies LLC, as sales agent and/or pri

March 26, 2021 S-3

Registration Statement on Form S-3 (No. 333-254733), filed with the SEC on March 26, 2021.

As filed with the Securities and Exchange Commission on March 25, 2021. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Strongbridge Biopharma plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation or organization) 2834 (Primary St

March 26, 2021 EX-4.5

Form of Subordinated Indenture

Exhibit 4.5 STRONGBRIDGE BIOPHARMA PLC and Trustee INDENTURE Dated as of SUBORDINATED DEBT SECURITIES CROSS-REFERENCE TABLE(1) Section of Trust Indenture Act of 1939, as amended Section of Indenture 310(a) 6.09 310(b) 6.08 6.10 310(c) Inapplicable 311(a) 6.13 311(b) 6.13 311(c) Inapplicable 312(a) 4.01 4.04 312(b) 4.04(c) 312(c) 4.04(c) 313(a) 4.03 313(b) 4.03 313(c) 4.03 313(d) 4.03 314(a) 4.02 3

March 26, 2021 EX-4.4

Form of Senior Indenture

Exhibit 4.4 STRONGBRIDGE BIOPHARMA PLC and Trustee INDENTURE Dated as of SENIOR DEBT SECURITIES CROSS-REFERENCE TABLE(1) Section of Trust Indenture Act of 1939, as amended Section of Indenture 310(a) 6.09 310(b) 6.08 6.10 310(c) Inapplicable 311(a) 6.13 311(b) 6.13 311(c) Inapplicable 312(a) 4.01 4.04 312(b) 4.04(c) 312(c) 4.04(c) 313(a) 4.03 313(b) 4.03 313(c) 4.03 313(d) 4.03 314(a) 4.02 314(b)

March 26, 2021 8-K

Entry into a Material Definitive Agreement, 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): March 25, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commissio

March 3, 2021 EX-99.1

Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2020 Financial Results and Provides Corporate Update ~ Submitted New Drug Application (NDA) for RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome to U.S. Fo

Exhibit 99.1 Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2020 Financial Results and Provides Corporate Update ~ Submitted New Drug Application (NDA) for RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome to U.S. Food & Drug Administration ~ ~ KEVEYIS® (dichlorphenamide) Full-Year 2020 Revenue of $30.7 Million, a 41.5 Percent Increase over 2019 Reven

March 3, 2021 8-K

Regulation FD Disclosure, 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 3, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commission

March 3, 2021 EX-21.1

Subsidiaries of Strongbridge Biopharma plc

Exhibit 21.1 Subsidiaries of the Company Strongbridge U.S. Inc. (a Delaware corporation) Strongbridge Dublin Limited (a private limited company incorporated under the laws of Ireland) Cortendo AB (a private limited company incorporated under the laws of Sweden)

March 3, 2021 10-K

Annual Report - 10-K

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

March 2, 2021 8-K

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 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commission

March 2, 2021 EX-99.1

Strongbridge Biopharma plc Announces Submission of New Drug Application for RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome to the U.S. Food & Drug Administration ~ RECORLEV® (levoketoconazole) New Drug Application is

Exhibit 99.1 Strongbridge Biopharma plc Announces Submission of New Drug Application for RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome to the U.S. Food & Drug Administration ~ RECORLEV® (levoketoconazole) New Drug Application is Supported by Previously-Reported Positive and Statistically Significant Results from the Phase 3 SONICS and LOGICS Studies ~ ~ Nearly 40

February 16, 2021 8-K

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): February 10, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commis

February 16, 2021 EX-99.1

Strongbridge Biopharma plc Announces Promotion of Richard S. Kollender to President and Chief Financial Officer

Exhibit 99.1 Strongbridge Biopharma plc Announces Promotion of Richard S. Kollender to President and Chief Financial Officer DUBLIN, Ireland and TREVOSE, Pa., February 16, 2021 — Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced

February 12, 2021 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)* STRONGBRIDGE BIOPHARMA plc (Name of Issuer) Ordinary shares, par value $0.01 per share (Title of Class o

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)* STRONGBRIDGE BIOPHARMA plc (Name of Issuer) Ordinary shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to

February 12, 2021 EX-99.A

JOINT FILING AGREEMENT

CUSIP No. G85347105 SCHEDULE 13G Page 8 of 8 Pages EXHIBIT A JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on this Schedule 13G dated February 12, 2021 (the “Schedule 13G”), with respect to the Common Stock, par value $0.0001 per share, of Strongbridge Biopharma plc is filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under th

February 12, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Strongbridge Biopharma plc (Name of Issuer) Common Stock, $0.

February 8, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 5)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 5)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to design

February 3, 2021 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., February 3, 2021 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awa

February 3, 2021 8-K

Regulation FD Disclosure, 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): February 3, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commiss

January 6, 2021 EX-99.1

Strongbridge Biopharma plc Announces Preliminary Fourth Quarter and Full-Year 2020 Financial Results and Provides Corporate Update ~ Expects to Report KEVEYIS® (dichlorphenamide) Fourth Quarter 2020 Revenue of Approximately $8.2 Million and Full-Year

Exhibit 99.1 Strongbridge Biopharma plc Announces Preliminary Fourth Quarter and Full-Year 2020 Financial Results and Provides Corporate Update ~ Expects to Report KEVEYIS® (dichlorphenamide) Fourth Quarter 2020 Revenue of Approximately $8.2 Million and Full-Year 2020 Revenue of Approximately $30.7 Million, a 41.5 Percent Increase over 2019 Revenue of $ $21.7 Million ~ ~ Targets Full-Year 2021 KEV

January 6, 2021 8-K

Regulation FD Disclosure, 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): January 6, 2021 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commissi

November 23, 2020 SC 13G/A

SBBP / Strongbridge Biopharma plc / TVM V LIFE SCIENCE VENTURES GMBH & CO KG - SC 13G/A Passive Investment

SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 (Amendment No. 1) Strongbridge Biopharma plc (Name of Issuer) Common Stock (Title of Class of Securities) G85347105 (CUSIP Number) November 23, 2020 (Date of Event Which Requires

October 29, 2020 EX-99.1

Strongbridge Biopharma plc Reports Third Quarter 2020 Financial Results and Provides Corporate Update ~ Company on Track to Submit New Drug Application (NDA) for RECORLEV® (levoketoconazole) to the FDA in the First Quarter of 2021 Following the Repor

Exhibit 99.1 Strongbridge Biopharma plc Reports Third Quarter 2020 Financial Results and Provides Corporate Update ~ Company on Track to Submit New Drug Application (NDA) for RECORLEV® (levoketoconazole) to the FDA in the First Quarter of 2021 Following the Reporting of Positive Top-line Data from the LOGICS Study in the Third Quarter of 2020 ~ ~ Reports KEVEYIS® (dichlorphenamide) Third Quarter 2

October 29, 2020 8-K

Regulation FD Disclosure, 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 29, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commiss

October 29, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 number 001-37569

September 23, 2020 SC 13D/A

SBBP / Strongbridge Biopharma plc / CAXTON CORP Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3) Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) G85347105 (CUSIP Number) Mr. Heath N. Weisberg Caxton Corporation 731 Alexander Road, Bldg. 2, Suite 500 Princeton, New Jersey 08540 (212) 205-6805 (Name, Addres

September 18, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events - 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): September 16, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commi

September 18, 2020 EX-1.1

Underwriting Agreement, dated as of September 16, 2020, by and between Strongbridge Biopharma plc and Jefferies LLC and Stifel, Nicolaus and Company, Incorporated, as representatives of the several underwriters named therein

Exhibit 1.1 11,111,111 Ordinary Shares Strongbridge Biopharma plc UNDERWRITING AGREEMENT September 16, 2020 JEFFERIES LLC STIFEL, NICOLAUS & COMPANY, INCORPORATED As Representatives of the several Underwriters c/o JEFFERIES LLC 520 Madison Avenue New York, New York 10022 c/o STIFEL, NICOLAUS & COMPANY, INCORPORATED 787 7th Avenue, 11th Floor New York, New York 10019 Ladies and Gentlemen: Introduct

September 18, 2020 EX-99.1

Strongbridge Biopharma plc Announces Proposed Public Offering of Ordinary Shares

Exhibit 99.1 Strongbridge Biopharma plc Announces Proposed Public Offering of Ordinary Shares Dublin, Ireland and Trevose, Pa., September 16, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it intends to offer and

September 18, 2020 EX-99.2

Strongbridge Biopharma plc Announces Pricing of Public Offering of Ordinary Shares

Exhibit 99.2 Strongbridge Biopharma plc Announces Pricing of Public Offering of Ordinary Shares Dublin, Ireland and Trevose, Pa., September 16, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has priced its prev

September 18, 2020 424B5

PROSPECTUS SUPPLEMENT (To Prospectus dated March 27, 2018)

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-223575 PROSPECTUS SUPPLEMENT (To Prospectus dated March 27, 2018) 11,111,111 Shares Ordinary Shares We are offering 11,111,111 of our ordinary shares. Our ordinary shares are listed on The Nasdaq Global Select Market under the symbol "SBBP." On September 15, 2020, the last reported sale price of our ordinary shares on The Nasd

September 16, 2020 424B5

SUBJECT TO COMPLETION, DATED SEPTEMBER 16, 2020 PRELIMINARY PROSPECTUS SUPPLEMENT (To Prospectus dated March 27, 2018)

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-223575 The information contained in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and we are not soliciting offers to buy these securities in any jurisdiction where the offer or sale is

September 8, 2020 EX-99.2

Strongbridge Biopharma plc Provides Corporate Update ~ Company Reported Positive and Statistically Significant Top-Line Results from the Pivotal Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome;

Exhibit 99.2 Strongbridge Biopharma plc Provides Corporate Update ~ Company Reported Positive and Statistically Significant Top-Line Results from the Pivotal Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome; To View the Complete Earlier Announcement, Visit the Company’s Website ~ ~ Company Anticipates Submitting a New Drug Application (NDA) fo

September 8, 2020 EX-99.3

STRONGBRIDGE BIOPHARMA PLC SEPTEMBER 2020 Forward-looking statements This document contains forward‐looking statements relating to the Company’s strategy, objectives, business development plans, financial position, clinical development, regulatory pl

Exhibit 99.3 STRONGBRIDGE BIOPHARMA PLC SEPTEMBER 2020 Forward-looking statements This document contains forward‐looking statements relating to the Company’s strategy, objectives, business development plans, financial position, clinical development, regulatory plans and revenue guidance. All statements other than statements of historical facts included in this document, including, without limitati

September 8, 2020 EX-99.1

Strongbridge Biopharma plc Announces Positive and Statistically Significant Top-Line Results from the Pivotal Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome ~ LOGICS Study Met Primary Endpoint

Exhibit 99.1 Strongbridge Biopharma plc Announces Positive and Statistically Significant Top-Line Results from the Pivotal Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome ~ LOGICS Study Met Primary Endpoint with High Statistical Significance; Results at the End of the Randomized-Withdrawal Phase of the Study Demonstrated that Withdrawing Pati

September 8, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events - 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): September 8, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other jurisdiction of incorporation) (Commis

August 4, 2020 EX-99.1

Strongbridge Biopharma plc Reports Second Quarter 2020 Financial Results and Provides Corporate Update ~ Reports KEVEYIS® (dichlorphenamide) Second Quarter 2020 Revenue of $7.8 Million, a 28 Percent Increase Compared to $6.1 Million During Second Qua

Exhibit 99.1 Strongbridge Biopharma plc Reports Second Quarter 2020 Financial Results and Provides Corporate Update ~ Reports KEVEYIS® (dichlorphenamide) Second Quarter 2020 Revenue of $7.8 Million, a 28 Percent Increase Compared to $6.1 Million During Second Quarter of 2019 ~ ~ Company Expects to Report Top-Line Results from the Phase 3 LOGICS Study of RECORLEV™ (levoketoconazole) in Endogenous C

August 4, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 001-37569 Stro

August 4, 2020 EX-10.1

Employment Agreement, dated as of July 2, 2020, by and between Strongbridge U.S. Inc. and John Johnson

Exhibit 10.1 EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (the “Agreement”) is made by and between Strongbridge U.S. Inc., a Delaware corporation (the “Company”), and John Johnson (“Executive”) as of July 2, 2020 (the "Effective Date"). W I T N E S S E T H: WHEREAS, the Company and Executive are parties to that certain Executive Chairman Agreement, dated as of November 1, 2019 (such agreement, t

August 4, 2020 EX-10.2

Term Loan Agreement, dated May 19, 2020, by Strongbridge Biopharma plc, along with Strongbridge U.S. Inc., Cortendo AB (publ) and Strongbridge Dublin Limited, Avenue Venture Opportunity Fund L.P., as administrative agent and collateral agent, and the lenders named therein (incorporated by reference to Exhibit 10.2 to the Form 10-Q (File No. 001-37569) filed with the SEC on August 4, 2020)

Exhibit 10.2 TERM LOAN AGREEMENT, dated as of May 19, 2020, among STRONGBRIDGE U.S. INC., as Borrower STRONGBRIDGE BIOPHARMA PLC, CORTENDO AB (PUBL), STRONGBRIDGE DUBLIN LIMITED, as Guarantors, The other Subsidiary Guarantors from Time to Time Party Hereto, The Lenders from Time to Time Party Hereto, and AVENUE VENTURE OPPORTUNITIES FUND, L.P., as Administrative Agent and Collateral Agent U.S. $30

August 4, 2020 EX-10.3

Form of Warrant to Venture Opportunities Fund, L.P., (incorporated by reference to Exhibit 10.3 to the Form 10-Q (File No. 001-37569) filed with the SEC on August 4, 2020)

Exhibit 10.3 WARRANT THIS WARRANT AND THE UNDERLYING SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR UNDER THE SECURITIES LAWS OF ANY STATE. THESE SECURITIES MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED EXCEPT AS PERMITTED UNDER THE ACT AND APPLICABLE STATE SECURITIES LAWS IN ACCORDANCE WITH APPLICABLE REGISTRATION REQU

August 4, 2020 8-K

Regulation FD Disclosure, 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): August 4, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

July 7, 2020 8-K

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): July 2, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

July 7, 2020 EX-99.1

Strongbridge Biopharma plc Announces Appointment of John H. Johnson to Chief Executive Officer

Exhibit 99.1 Strongbridge Biopharma plc Announces Appointment of John H. Johnson to Chief Executive Officer Dublin, Ireland and Trevose, Pa., July 7, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that at the request o

May 20, 2020 EX-99.1

Strongbridge Biopharma plc Announces $30 Million Debt Facility with Avenue Venture Opportunities Fund, L.P.

Exhibit 99.1 Strongbridge Biopharma plc Announces $30 Million Debt Facility with Avenue Venture Opportunities Fund, L.P. Dublin, Ireland and Trevose, Pa., May 20, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it

May 20, 2020 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

/ 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, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

May 14, 2020 8-K

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 14, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 11, 2020 8-K

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): May 11, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 11, 2020 EX-99.1

Strongbridge Biopharma plc Announces Completion of Enrollment of Phase 3 LOGICS Study for RECORLEV® (levoketoconazole) for Endogenous Cushing’s Syndrome ~ Company Expects to Report Top-Line LOGICS Results During the Third Quarter of 2020 ~

Exhibit 99.1 Strongbridge Biopharma plc Announces Completion of Enrollment of Phase 3 LOGICS Study for RECORLEV® (levoketoconazole) for Endogenous Cushing’s Syndrome ~ Company Expects to Report Top-Line LOGICS Results During the Third Quarter of 2020 ~ Dublin, Ireland and Trevose, Pa., May 11, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company fo

May 6, 2020 EX-99.1

Strongbridge Biopharma plc Reports First Quarter 2020 Financial Results and Provides Corporate Update ~ Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) Reaches 41 of 42 Targeted Study Participants Completing the Randomized Withdrawal Phase; One

Exhibit 99.1 Strongbridge Biopharma plc Reports First Quarter 2020 Financial Results and Provides Corporate Update ~ Phase 3 LOGICS Study of RECORLEV® (levoketoconazole) Reaches 41 of 42 Targeted Study Participants Completing the Randomized Withdrawal Phase; One Additional Patient Currently in the Randomized Withdrawal Phase and One Other Patient Scheduled to be Randomized Imminently ~ ~ LOGICS En

May 6, 2020 8-K

Regulation FD Disclosure, 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 6, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number)

May 6, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 001-37569 Str

April 20, 2020 DEFA14A

SBBP / Strongbridge Biopharma plc DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2)) ☐ Defini

April 10, 2020 EX-10.1

Amendment to Executive Chairman Agreement.

Exhibit 10.1 STRONGBRIDGE U.S. INC. AMENDMENT TO EXECUTIVE CHAIRMAN AGREEMENT This Amendment (“Amendment”) to the Executive Chairman Agreement between Strongbridge Biopharma plc (“Strongbridge”), Strongbridge U.S. Inc., a Delaware corporation (the “Company”), and John Johnson (the “Executive”) dated November 1, 2020 (the “Agreement”) is made and entered into as of April 8, 2020 (the “Effective Dat

April 10, 2020 8-K

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 8, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numbe

April 1, 2020 DEF 14A

Our Definitive Proxy Statement on Schedule 14A, filed with the SEC on April 1, 2020;

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

March 19, 2020 SC 13G

G85347105 / Strongbridge Biopharma PLC / Ikarian Capital, LLC - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* STRONGBRIDGE BIOPHARMA plc (Name of Issuer) Ordinary shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) March 9, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to design

March 19, 2020 EX-99.1

JOINT FILING AGREEMENT March 19, 2020

EX-99.1 EXHIBIT 99.1 JOINT FILING AGREEMENT March 19, 2020 Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended (the “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 Act or any rule or regulation thereunder (includ

March 17, 2020 PRE 14A

SBBP / Strongbridge Biopharma plc PRE 14A - - PRE 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: x Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14

March 5, 2020 S-8

Form S-8 filed with the SEC on March 5, 2020 (File No. 333-236911)

As filed with the Securities and Exchange Commission on March 5, 2020 Registration Number 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 28, 2020 EX-4.1

Description of Ordinary Shares

Exhibit 4.1 STRONGBRIDGE BIOPHARMA PLC DESCRIPTION OF ORDINARY SHARES Strongbridge Biopharma plc (the “Company”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) – ordinary shares, par value $0.01 per share (the “Ordinary Shares”). The Ordinary Shares trade on The Nasdaq Global Select Market under the trading symbol “SB

February 28, 2020 EX-10.16

Form of Restricted Stock Unit Award Agreement under the Strongbridge Biopharma Non-Employee Director Equity Compensation Plan.

Exhibit 10.16 STRONGBRIDGE BIOPHARMA PLC NON-EMPLOYEE DIRECTOR EQUITY COMPENSATION PLAN RESTRICTED STOCK UNIT AWARD Strongbridge Biopharma plc (the “Company”) has determined to grant to you an award of restricted stock units (the “RSUs”) under the Non-Employee Director Equity Compensation Plan (the “Plan”). The terms of the grant are set forth in the attached Restricted Stock Unit Award Agreement

February 28, 2020 10-K

SBBP / Strongbridge Biopharma plc 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: 001-37

February 28, 2020 EX-10.26

Amendment to Option Award Agreements, dated as of November 26, 2019, by and between Strongbridge Biopharma plc and Matthew Pauls

Exhibit 10.26 STRONGBRIDGE BIOPHARMA PLC AMENDMENT TO OPTION AWARD AGREEMENTS This AMENDMENT TO OPTION AWARD AGREEMENTS (this “Agreement”) dated as of November 26, 2019, is entered into by and between Strongbridge Biopharma plc (the “Company”) and Matthew Pauls (the “Grantee”). The Grantee has previously received grants of restricted stock units and stock options under the Strongbridge Biopharma p

February 28, 2020 EX-10.25

Executive Chairman Agreement, dated as of November 1, 2019, by and between Strongbridge Biopharma plc and John Johnson

Exhibit 10.25 STRONGBRIDGE U.S. INC. EXECUTIVE CHAIRMAN AGREEMENT This Executive Chairman Agreement (the “Agreement”) is made and entered into as of November 1, 2019 (the “Effective Date”), between Strongbridge Biopharma plc (“Strongbridge”), Strongbridge U.S. Inc., a Delaware corporation (the “Company”), and John Johnson (the “Executive”). WHEREAS, the Executive currently serves as a non-executiv

February 28, 2020 EX-21.1

Subsidiaries of Strongbridge Biopharma plc

Exhibit 21.1 Subsidiaries of the Company Strongbridge U.S. Inc. (a Delaware corporation) Strongbridge Dublin Limited (a private limited company incorporated under the laws of Ireland) Cortendo AB (publ) (a public limited liability company incorporated under the laws of Sweden)

February 28, 2020 EX-10.8

Form of Indemnification Agreement

FORM OF INDEMNIFICATION AGREEMENT Exhibit 10.8 Dated Strongbridge Biopharma public limited company and [] DEED OF INDEMNIFICATION AGREEMENT THIS DEED OF INDEMNIFICATION (this “Agreement”), dated as of [], is made by and between Strongbridge Biopharma public limited company, an Irish public limited company (“Strongbridge”) and [] (the “Indemnitee”). WHEREAS, the Company and Indemnitee intend for th

February 25, 2020 8-K

Regulation FD Disclosure, 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 25, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

February 25, 2020 EX-99.1

BIOPHARMA PLC STRONGBRIDGE FEBRUARY 2020

Exhibit 99.1 BIOPHARMA PLC STRONGBRIDGE FEBRUARY 2020 Forward-looking statements This document contains forward-looking statements relating to the Company’s strategy, objectives, business development plans and financial position. All statements other than statements of historical facts included in this document, including, without limitation, statements regarding the Company’s future financial pos

February 25, 2020 EX-99.1

Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2019 Financial Results and Provides Corporate Update ~ KEVEYIS®(dichlorphenamide) Full-Year 2019 Revenue of $21.7 Million, a 29 Percent Increase over 2018 Revenue of $16.8 Million ~ ~ Fu

Exhibit 99.1 Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2019 Financial Results and Provides Corporate Update ~ KEVEYIS®(dichlorphenamide) Full-Year 2019 Revenue of $21.7 Million, a 29 Percent Increase over 2018 Revenue of $16.8 Million ~ ~ Full-Year 2020 KEVEYIS®(dichlorphenamide) Revenue Guidance of Approximately $26 to $27 Million; Company Anticipates Continued Positive and

February 25, 2020 8-K

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): February 25, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

February 14, 2020 SC 13G/A

SBBP / Strongbridge Biopharma plc / ARMISTICE CAPITAL, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

February 13, 2020 SC 13G/A

SBBP / Strongbridge Biopharma plc / Broadfin Capital, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

February 6, 2020 SC 13G/A

SBBP / Strongbridge Biopharma plc / HealthCap VI, L.P. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2019 (Date of Event which Requires Filing of this Statement) Check the appropriate box to design

January 30, 2020 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., January 30, 2020 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awa

January 30, 2020 8-K

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): January 30, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Nu

January 9, 2020 8-K

Regulation FD Disclosure, 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): January 9, 2020 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Num

January 9, 2020 EX-99.1

Strongbridge Biopharma plc Announces Preliminary Fourth Quarter and Full-Year 2019 Financial Results and Provides Update on Corporate Priorities ~ Expects to Report KEVEYIS®(dichlorphenamide) Fourth Quarter 2019 Revenue of Approximately $5.6 Million

Strongbridge Biopharma plc Announces Preliminary Fourth Quarter and Full-Year 2019 Financial Results and Provides Update on Corporate Priorities ~ Expects to Report KEVEYIS®(dichlorphenamide) Fourth Quarter 2019 Revenue of Approximately $5.

November 19, 2019 EX-99.1

Strongbridge Biopharma plc November 2019 Forward-looking statements This document contains forward‐looking statements relating to the Company’s strategy, objectives, business development plans and financial position. All statements other than stateme

Exhibit 99.1 Strongbridge Biopharma plc November 2019 Forward-looking statements This document contains forward‐looking statements relating to the Company’s strategy, objectives, business development plans and financial position. All statements other than statements of historical facts included in this document, including, without limitation, statements regarding the Company’s future financial pos

November 19, 2019 8-K

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 19, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

November 18, 2019 8-K

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 18, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

November 18, 2019 8-K

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): November 18, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

November 18, 2019 EX-99.1

Strongbridge Biopharma plc Announces Additional Steps to Improve Operational Efficiencies and Appoints New Lead Independent Director ~ The Company Remains Focused on Completing the LOGICS Study and Submitting a New Drug Application (NDA) for RECORLEV

Strongbridge Biopharma plc Announces Additional Steps to Improve Operational Efficiencies and Appoints New Lead Independent Director ~ The Company Remains Focused on Completing the LOGICS Study and Submitting a New Drug Application (NDA) for RECORLEV™ (levoketoconazole), While Ensuring Continued Growth and Profitability of KEVEYIS® (dichlorphenamide) and Serving the Unmet Needs of the Primary Periodic Paralysis Community ~ Dublin, Ireland and Trevose, Pa.

November 7, 2019 10-Q

SBBP / Strongbridge Biopharma plc 10-Q - Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 number 001-37569

November 7, 2019 EX-10.1

Consulting Agreement by and between Strongbridge U.S. Inc. and A. Brian Davis, dated as of September 3, 2019.

Exhibit 10.1 CONSULTING AGREEMENT This agreement (the “Agreement”) is entered into as of September 3, 2019 (the “Effective Date”) by and between Strongbridge U.S. Inc., having an address at 900 Northbrook Drive, Suite 200, Trevose, PA 19053 (“Company”) and A. Brian Davis, having an address at 504 School House Lane, Willow Grove, PA 19090 (“Consultant”). Consultant and Company agree as follows: 1.

November 7, 2019 EX-99.1

Strongbridge Biopharma plc Reports Third Quarter 2019 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) Achieved $5.7 Million in Revenue Along with a Positive Contribution Margin in Third Quarter of 2019; Strongbridge Rema

Exhibit 99.1 Strongbridge Biopharma plc Reports Third Quarter 2019 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) Achieved $5.7 Million in Revenue Along with a Positive Contribution Margin in Third Quarter of 2019; Strongbridge Remains On-Track to Meet or Exceed the Top End of Full-Year KEVEYIS Revenue Guidance of $18 Million to $20 Million ~ ~ Phase 3 LOGICS Study o

November 7, 2019 8-K

Regulation FD Disclosure, 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): November 7, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Nu

November 5, 2019 8-K

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, Results of Operations and Financial Condition, 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): November 1, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Nu

November 5, 2019 EX-99.1

Strongbridge Biopharma plc Announces CEO Transition Plan and Provides Preliminary Third Quarter 2019 Financial Results and Corporate Updates

Exhibit 99.1 Strongbridge Biopharma plc Announces CEO Transition Plan and Provides Preliminary Third Quarter 2019 Financial Results and Corporate Updates Dublin, Ireland and Trevose, Pa., November 5, 2019 — Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant

August 13, 2019 8-K

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): August 8, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

August 13, 2019 EX-99.1

Strongbridge Biopharma Announces Key Leadership Appointments to Support Next Stage of Growth ~ Richard S. Kollender Appointed to Chief Operating Officer ~ ~ Robert Lutz Promoted to Chief Financial Officer ~ ~ David Gill Appointed to Board of Director

Strongbridge Biopharma Announces Key Leadership Appointments to Support Next Stage of Growth ~ Richard S.

July 31, 2019 EX-99.1

Strongbridge Biopharma plc Reports Second Quarter 2019 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) Second Quarter 2019 Revenue of $6.1 Million ~ ~ Company on Track to Meet Full-Year 2019 KEVEYIS® Revenue Guidance of

Exhibit 99.1 Strongbridge Biopharma plc Reports Second Quarter 2019 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) Second Quarter 2019 Revenue of $6.1 Million ~ ~ Company on Track to Meet Full-Year 2019 KEVEYIS® Revenue Guidance of $18 to $20 Million ~ ~ Enrollment in Phase 3 LOGICS Study for RECORLEV™ (levoketoconazole) Progressing with Top-Line Data Anticipated at

July 31, 2019 8-K

Regulation FD Disclosure, 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 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numbe

July 31, 2019 10-Q

SBBP / Strongbridge Biopharma plc 10-Q - Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 ☐ 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 001-37569 Stro

July 19, 2019 8-K

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): July 19, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numbe

July 19, 2019 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., July 19, 2019 – Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awards

May 16, 2019 8-K

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, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 1, 2019 8-K

Regulation FD Disclosure, 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 1, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland 001-37569 98-1275166 (State or other (Commission (I.R.S. Employer jurisdiction of

May 1, 2019 EX-99.1

Strongbridge Biopharma plc Reports First Quarter 2019 Financial Results and Provides Corporate Update ~ Following Type C Meeting with the U.S. Food & Drug Administration (FDA), Strongbridge Plans to Submit its New Drug Application (NDA) for RECORLEV™

Exhibit 99.1 Strongbridge Biopharma plc Reports First Quarter 2019 Financial Results and Provides Corporate Update ~ Following Type C Meeting with the U.S. Food & Drug Administration (FDA), Strongbridge Plans to Submit its New Drug Application (NDA) for RECORLEV™ (levoketoconazole) in the Third Quarter of 2020; Submission to Include Data From the Phase 3 SONICS and LOGICS Studies ~ ~ Newly Present

May 1, 2019 10-Q

SBBP / Strongbridge Biopharma plc 10-Q Quarterly Report 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] 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 [ ] 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 001-37569

April 18, 2019 S-8

Form S-8 filed with the SEC on April 18, 2019 (File No. 333-230931)

As filed with the Securities and Exchange Commission on April 18, 2019 Registration Number 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

April 12, 2019 DEF 14A

SBBP / Strongbridge Biopharma plc DEF 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

March 11, 2019 8-K

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 11, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

March 11, 2019 EX-99.1

Strongbridge Biopharma plc Announces Top-Line Results from Extended Evaluation Phase of the Pivotal Phase 3 SONICS Study of RECORLEV™ (levoketoconazole) for the Potential Treatment of Endogenous Cushing’s Syndrome ~ Extended Evaluation Phase Meets Ob

Exhibit 99.1 Strongbridge Biopharma plc Announces Top-Line Results from Extended Evaluation Phase of the Pivotal Phase 3 SONICS Study of RECORLEV™ (levoketoconazole) for the Potential Treatment of Endogenous Cushing’s Syndrome ~ Extended Evaluation Phase Meets Objective of Showing Positive Long-Term Benefit-Risk Profile of RECORLEV™ (levoketoconazole) ~ ~ Favorable Liver-Related Findings: No Patie

March 8, 2019 8-K

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): March 8, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numbe

March 8, 2019 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., March 8, 2019 — Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awards

February 27, 2019 EX-10.15

Strongbridge Biopharma plc 2017 Inducement Plan (incorporated by reference to Exhibit 10.15 of Strongbridge Biopharma plc’s Annual Report on Form 10-K (File No. 001-37569) filed with the Securities and Exchange Commission on February 27, 2019)

Exhibit 10.15 STRONGBRIDGE BIOPHARMA PLC 2017 INDUCEMENT PLAN The purpose of the Strongbridge Biopharma plc 2017 Inducement Plan is to assist Strongbridge Biopharma plc and its affiliates and subsidiaries in attracting valued employees by offering them a greater stake in the Company’s success and a closer identity with it, and to encourage ownership of the Company’s stock by such employees. 1. Def

February 27, 2019 EX-10.14

Strongbridge Biopharma plc Non-Employee Director Equity Compensation Plan (incorporated by reference to Exhibit 10.14 of Strongbridge Biopharma plc’s Annual Report on Form 10-K (File No. 001-37569) filed with the Securities and Exchange Commission on February 27, 2019)

Exhibit 10.14 STRONGBRIDGE BIOPHARMA PLC NON-EMPLOYEE DIRECTOR EQUITY COMPENSATION PLAN The purpose of the Strongbridge Biopharma plc Non-Employee Director Equity Compensation Plan (the “Plan”) is to provide non-employee members of the Board of Directors (the “Board”) of Strongbridge Biopharma plc (the “Company”) with the opportunity to receive grants of nonqualified stock options and stock awards

February 27, 2019 EX-21.1

Subsidiaries of the Company

Exhibit 21.1 Subsidiaries of the Company Strongbridge U.S. Inc. (a Delaware corporation) Strongbridge Dublin Limited (a private limited company incorporated under the laws of Ireland) Cortendo AB (publ) (a public limited liability company incorporated under the laws of Sweden) Cortendo Cayman Ltd. (an exempted company incorporated in the Cayman Islands)

February 27, 2019 EX-10.13

Strongbridge Biopharma plc 2015 Equity Compensation Plan (incorporated by reference to Exhibit 10.13 of Strongbridge Biopharma plc’s Annual Report on Form 10-K (File No. 001-37569) filed with the Securities and Exchange Commission on February 27, 2019)

Exhibit 10.13 STRONGBRIDGE BIOPHARMA PLC 2015 EQUITY COMPENSATION PLAN The purpose of the Strongbridge Biopharma plc 2015 Equity Compensation Plan (the “Plan”) is to provide (i) designated employees of Strongbridge Biopharma plc (the “Company”) and its parents and subsidiaries; (ii) certain consultants and advisors who perform services for the Company or its parents or subsidiaries; and (iii) non-

February 27, 2019 10-K

SBBP / Strongbridge Biopharma plc 10-K (Annual Report)

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, 2018 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: 001-37

February 26, 2019 8-K

Regulation FD Disclosure, 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, 2019 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File N

February 26, 2019 EX-99.1

Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2018 Financial Results ~ RECORLEV™ (levoketoconazole) Phase 3 Clinical Program and Type C FDA Meeting in First Quarter Progressing as Planned ~ ~ $145 Million Upfront Cash Payment and $3

Exhibit 99.1 Strongbridge Biopharma plc Reports Fourth Quarter and Full-Year 2018 Financial Results ~ RECORLEV™ (levoketoconazole) Phase 3 Clinical Program and Type C FDA Meeting in First Quarter Progressing as Planned ~ ~ $145 Million Upfront Cash Payment and $36.7 Million Equity Investment from Novo Nordisk in Fourth Quarter 2018 Significantly Strengthened Company’s Financial Position Including

February 14, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / Opaleye Management Inc. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 STRONGBRIDGE BIOPHARMA PLC (Name of Issuer) Ordinary Shares (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule i

February 14, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / Vivo Capital VIII, LLC - SCHEDULE 13G/A Passive Investment

Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2) Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

February 14, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / ARMISTICE CAPITAL, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

February 13, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / Broadfin Capital, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

February 12, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / Longitude Capital Partners Iii, Llc - SC 13G/A Passive Investment

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)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value per share (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to

February 1, 2019 SC 13G/A

SBBP / Strongbridge Biopharma plc / HealthCap VI, L.P. - SC 13GA Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G85347105 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to design

December 28, 2018 EX-99.1

AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G

EX-99.1 CUSIP No. G85347105 SCHEDULE 13G Page 1 3 of 13 Pages EXHIBIT 1 AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G The undersigned hereby agree that the Schedule 13G relating to the common stock of Strongbridge Biopharma plc, and any further amendments thereto, to which this Agreement as to Joint Filing of Schedule 13G is attached as an exhibit is filed on behalf of each of them pursuant to and

December 28, 2018 SC 13G

SBBP / Strongbridge Biopharma plc / Capital Royalty L.p. - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 and 13d-2 Under the Securities Exchange Act of 1934 (Amendment No. )* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value per share (Title of Class of Securities) G85347105 (CUSIP Number) December 18, 2018 (Date of Event W

December 21, 2018 SC 13G

SBBP / Strongbridge Biopharma plc / NOVO NORDISK A S - FORM SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value per share (Title of Class of Securities) G85347105 (CUSIP Number) December 18, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

December 19, 2018 8-K

Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

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 18, 2018 STRONGBRIDGE BIOPHARMA plc (Exact Name of Registrant as Specified in Its Charter) Ireland (State or Other Jurisdiction of Incorporation) 001-37569 98-1275166 (Commis

November 9, 2018 SC 13G

SBBP / Strongbridge Biopharma plc / Longitude Capital Partners Iii, Llc - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value per share (Title of Class of Securities) G85347105 (CUSIP Number) October 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to des

November 9, 2018 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 Exhibit 1 JOINT FILING AGREEMENT The undersigned hereby agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned, and any amendments thereto executed by the undersigned shall be filed on behalf of each of the undersigned without the necessity of filing any additional joint filing agreement. The undersigned acknowledge that each is responsible for the

October 31, 2018 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, 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): October 31, 2018 STRONGBRIDGE BIOPHARMA plc (Exact Name of Registrant as Specified in Its Charter) Ireland (State or Other Jurisdiction of Incorporation) 001-37569 98-1275166 (Commiss

October 31, 2018 EX-2.1

Macrilen Acquisition Agreement, dated as of October 31, 2018, between Strongbridge Biopharma plc and Novo Nordisk Healthcare AG.

Exhibit 2.1 Execution Version MACRILEN ACQUISITION AGREEMENT dated as of October 31, 2018 between NOVO NORDISK HEALTHCARE AG and STRONGBRIDGE BIOPHARMA PUBLIC LIMITED COMPANY #91416580v21 TABLE OF CONTENTS PAGE ARTICLE 1 DEFINITIONS Section 1.01. Definitions 1 Section 1.02. Construction 13 Section 1.03. Captions 14 Section 1.04. Time 14 ARTICLE 2 PUT AND CALL OPTIONS 14 Section 2.01. Put Option 14

October 31, 2018 EX-2.2

Macrilen Acquisition Agreement, dated as of October 31, 2018, between Strongbridge Biopharma plc and Novo Nordisk Healthcare AG (incorporated by reference to Exhibit 2.2 to the Form 8-K (File No. 001-37569) filed with the SEC on October 31, 2018)

Exhibit 2.2 Execution Version SHARE PURCHASE AGREEMENT dated as of October 31, 2018 between NOVO NORDISK A/S and STRONGBRIDGE BIOPHARMA PUBLIC LIMITED COMPANY TABLE OF CONTENTS PAGE ARTICLE 1 DEFINITIONS Section 1.01. Definitions 1 Section 1.02. Construction 15 Section 1.03. Captions 15 Section 1.04. Time 16 ARTICLE 2 PURCHASE AND SALE Section 2.01. Issuance and Sale 16 Section 2.02. Closing 16 Se

October 31, 2018 EX-99.1

Strongbridge Biopharma plc Enters into Agreement for Novo Nordisk to Acquire the U.S. and Canadian Rights to MACRILEN™ (macimorelin) ~ Strongbridge to Receive Upfront Payment of $145 Million and Tiered Royalty Stream from Novo Nordisk ~ ~ Novo Nordis

Exhibit 99.1 Strongbridge Biopharma plc Enters into Agreement for Novo Nordisk to Acquire the U.S. and Canadian Rights to MACRILEN™ (macimorelin) ~ Strongbridge to Receive Upfront Payment of $145 Million and Tiered Royalty Stream from Novo Nordisk ~ ~ Novo Nordisk to Purchase Approximately 5.2 Million Ordinary Shares of Strongbridge Biopharma plc at Purchase Price of $7.00 per Share, Resulting in

October 31, 2018 EX-99.1

Strongbridge Biopharma plc Reports Third Quarter 2018 Financial Results and Provides Corporate Update ~ Financial Position to be Significantly Strengthened in Fourth Quarter 2018 by $145 Million of Upfront Cash and $36.7 Million Equity Investment fro

Exhibit 99.1 Strongbridge Biopharma plc Reports Third Quarter 2018 Financial Results and Provides Corporate Update ~ Financial Position to be Significantly Strengthened in Fourth Quarter 2018 by $145 Million of Upfront Cash and $36.7 Million Equity Investment from Separately Announced Transactions with Novo Nordisk; Company Intends to Utilize Portion of Proceeds to Repay Outstanding Debt of $88 Mi

October 31, 2018 8-K

Regulation FD Disclosure, 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 31, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Nu

October 31, 2018 10-Q

SBBP / Strongbridge Biopharma plc 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended September 30, 2018 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 001-3

October 22, 2018 8-K

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 22, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Nu

October 22, 2018 EX-99.1

Strongbridge Biopharma plc Presents Detailed Initial Results from Pivotal Phase 3 SONICS Study of RECORLEV™ (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome at the 18th Annual Congress of the European NeuroEndocrine Association ~

Exhibit 99.1 Strongbridge Biopharma plc Presents Detailed Initial Results from Pivotal Phase 3 SONICS Study of RECORLEV™ (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome at the 18th Annual Congress of the European NeuroEndocrine Association ~ As Previously Reported, SONICS Met its Primary Endpoint With 30 Percent of the ITT Patient Population Reaching & Maintaining Mean Urinar

August 28, 2018 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., August 28, 2018 — Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awar

August 28, 2018 8-K

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): August 28, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Num

August 27, 2018 SC 13D/A

SBBP / Strongbridge Biopharma plc / CAXTON CORP Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2) Strongbridge Biopharma plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) G85347105 (CUSIP Number) Mr. Heath N. Weisberg Caxton Corporation 731 Alexander Road, Bldg. 2, Suite 500 Princeton, New Jersey 08540 (212) 205-6805 (Name, Addres

August 16, 2018 8-K

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 15, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Num

August 16, 2018 EX-99.1

Strongbridge Biopharma plc Announces Termination of Public Offering of Ordinary Shares

Exhibit 99.1 Strongbridge Biopharma plc Announces Termination of Public Offering of Ordinary Shares DUBLIN, Ireland and TREVOSE, Pa., August 15, 2018 — Strongbridge Biopharma plc (NASDAQ:SBBP) (the “Company”) today announced that it has terminated the public offering of ordinary shares previously announced on August 14, 2018. The termination results from an assessment by the Company’s management t

August 15, 2018 424B5

PROSPECTUS SUPPLEMENT (To Prospectus dated March 27, 2018) Subject to Completion, Dated August 14, 2018

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No.

August 8, 2018 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, 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 8, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

August 8, 2018 EX-99.2

Strongbridge Biopharma plc Announces Positive Top-Line Results from the Pivotal Phase 3 SONICS Study of RECORLEVÔ (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome ~ SONICS Study Met Primary Endpoint with RECORLEV Demonstrating a

Exhibit 99.2 Strongbridge Biopharma plc Announces Positive Top-Line Results from the Pivotal Phase 3 SONICS Study of RECORLEVÔ (levoketoconazole) for the Treatment of Endogenous Cushing’s Syndrome ~ SONICS Study Met Primary Endpoint with RECORLEV Demonstrating a Statistically Significant Normalization Rate of Urinary Free Cortisol at Six Months ~ ~ Key Secondary Endpoints Evaluating Cardiovascular

August 8, 2018 EX-99.1

Strongbridge Biopharma plc Reports Second Quarter 2018 Financial Results and Provides Corporate Update ~ Statistically Significant Positive Top-line Clinical Results Reported from SONICS Phase 3 Study of RECORLEV™ (levoketoconazole) in Endogenous Cus

Exhibit 99.1 Strongbridge Biopharma plc Reports Second Quarter 2018 Financial Results and Provides Corporate Update ~ Statistically Significant Positive Top-line Clinical Results Reported from SONICS Phase 3 Study of RECORLEV™ (levoketoconazole) in Endogenous Cushing’s Syndrome ~ ~ Rare Endocrine Franchise Expands with the U.S. Launch of MACRILENÔ (macimorelin) for the Diagnosis of Adult Growth Ho

August 8, 2018 EX-99.3

Strongbridge Biopharma plc August 2018

Exhibit 99.3 Strongbridge Biopharma plc August 2018 Forward-looking statements This document contains forward-looking statements relating to the Company’s strategy, objectives, business development plans and financial position. All statements other than statements of historical facts included in this document, including, without limitation, statements regarding the Company’s future financial posit

August 8, 2018 10-Q

SBBP / Strongbridge Biopharma plc 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2018 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 001-37569

August 8, 2018 EX-10.1

Amendment No. 2 to Term Loan Agreement, dated as of June 6, 2018, by and among and among Strongbridge U.S. Inc., Strongbridge Biopharma Public Limited Company, Cortendo Cayman Ltd., Strongbridge Ireland Limited, Cortendo AB (publ), CRG Servicing LLC, as administrative agent and collateral agent, and the lenders listed therein. (incorporated by reference to Exhibit 10.1 to the Form 10-Q (File No. 001-37569) filed with the SEC on August 8, 2018)

CONFIDENTIAL TREATMENT REQUESTED UNDER C.F.R. SECTIONS 200.80(b)(4), 200.83 AND 230.406. [****] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION. Exhibit 10.1 EXECUTION VERSION AMENDMENT NO. 2 TO TERM LOAN AGREEMENT THIS AMENDMENT NO. 2 TO TERM LOAN AGREEMENT,

June 22, 2018 SC 13G

SBBP / Strongbridge Biopharma plc / Opaleye Management Inc. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 STRONGBRIDGE BIOPHARMA PLC (Name of Issuer) Ordinary Shares (Title of Class of Securities) G85347105 (CUSIP Number) June 12, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is file

June 11, 2018 8-K

Entry into 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 6, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 31, 2018 S-8

SBBP / Strongbridge Biopharma plc S-8

As filed with the Securities and Exchange Commission on May 31, 2018 Registration Number 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

May 17, 2018 8-K

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, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 10, 2018 8-K

Regulation FD Disclosure, 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 10, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number

May 10, 2018 EX-99.1

Strongbridge Biopharma plc Reports First Quarter 2018 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) First Quarter 2018 Revenue of $3.9 Million ~ ~ Increased Full-Year 2018 Revenue Guidance for KEVEYIS from $16 to $19 M

Exhibit 99.1 Strongbridge Biopharma plc Reports First Quarter 2018 Financial Results and Provides Corporate Update ~ KEVEYIS® (dichlorphenamide) First Quarter 2018 Revenue of $3.9 Million ~ ~ Increased Full-Year 2018 Revenue Guidance for KEVEYIS from $16 to $19 Million to $18 to $20 Million ~ ~ MACRILEN™ (macimorelin) Product Launch on Track for July 2018 ~ ~ Development Program for RECORLEV™ (lev

May 10, 2018 10-Q

SBBP / Strongbridge Biopharma plc 10-Q (Quarterly Report)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended March 31, 2018 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 001-37569

May 3, 2018 8-K

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): May 3, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Number)

May 3, 2018 EX-99.1

Strongbridge Biopharma plc Announces New Employment Inducement Awards

Exhibit 99.1 Strongbridge Biopharma plc Announces New Employment Inducement Awards Dublin, Ireland and Trevose, Pa., May 3, 2018 — Strongbridge Biopharma plc, (Nasdaq: SBBP), a global commercial-stage biopharmaceutical company focused on the development and commercialization of therapies for rare diseases with significant unmet needs, today announced that it has approved inducement equity awards t

April 13, 2018 DEF 14A

SBBP / Strongbridge Biopharma plc DEF 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

March 27, 2018 CORRESP

SBBP / Strongbridge Biopharma plc CORRESP

900 Northbrook Drive Suite 200 Trevose, PA 19053 (610) 254-9022 March 27, 2018 VIA EDGAR United States Securities and Exchange Commission 100 F Street, NE Washington, D.

March 27, 2018 CORRESP

SBBP / Strongbridge Biopharma plc CORRESP

900 Northbrook Drive Suite 200 Trevose, PA 19053 (610) 254-9022 March 27, 2018 VIA EDGAR United States Securities and Exchange Commission 100 F Street, NE Washington, D.

March 22, 2018 S-3/A

SBBP / Strongbridge Biopharma plc S-3/A

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on March 22, 2018.

March 22, 2018 CORRESP

SBBP / Strongbridge Biopharma plc CORRESP

599 Lexington Avenue New York, NY 10022-7650 Tel +1 212 521 5400 Fax +1 212 521 5450 reedsmith.

March 12, 2018 S-3

Registration Statement on Form S-3 (No. 333-223576), filed with the SEC on March 12, 2018;

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on March 12, 2018.

March 12, 2018 S-3

Form S-3 (No. 333-223575), filed with the SEC on March 12, 2018

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on March 12, 2018.

March 12, 2018 POS AM

SBBP / Strongbridge Biopharma plc POS AM

As filed with the Securities and Exchange Commission on March 12, 2018 Registration No.

March 12, 2018 POS AM

SBBP / Strongbridge Biopharma plc POS AM

As filed with the Securities and Exchange Commission on March 12, 2018 Registration No.

March 12, 2018 8-K

SBBP / Strongbridge Biopharma plc 8-K (Current Report)

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 12, 2018 STRONGBRIDGE BIOPHARMA plc (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-37569 (Commission File Numb

March 12, 2018 EX-99.1

Strongbridge Biopharma plc Reports Full-Year 2017 Financial Results ~ KEVEYIS® (dichlorphenamide) Fourth Quarter and Full-Year 2017 Revenue of $3.0 Million and $7.0 Million, Respectively ~ ~ Full-Year 2018 KEVEYIS Revenue Guidance of $16 to $19 Milli

Exhibit 99.1 Strongbridge Biopharma plc Reports Full-Year 2017 Financial Results ~ KEVEYIS® (dichlorphenamide) Fourth Quarter and Full-Year 2017 Revenue of $3.0 Million and $7.0 Million, Respectively ~ ~ Full-Year 2018 KEVEYIS Revenue Guidance of $16 to $19 Million ~ ~ MACRILEN™ (macimorelin) Product Launch on Track for Mid-2018 ~ ~ RECORLEV™ (levoketoconazole) Phase 3 Clinical Program Progressing

March 12, 2018 EX-10.20

Form of Stock Option Award Agreement under the Strongbridge Biopharma plc 2017 Inducement Plan (incorporated by reference to Exhibit 10.20 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

Exhibit 10.20 STRONGBRIDGE BIOPHARMA plc 2017 INDUCEMENT PLAN STOCK OPTION AWARD Strongbridge Biopharma plc (the “Company”) has granted you a Stock Option (the “Option”) under the 2017 Inducement Plan (the “Plan”). The terms of the grant are set forth in the Stock Option Award Agreement provided to you (the “Agreement”). The following provides a summary of the key terms of the grant; however, you

March 12, 2018 EX-21.1

Subsidiaries of the Company

Exhibit 21.1 Subsidiaries of the Company Strongbridge U.S. Inc. (a Delaware corporation) Strongbridge Ireland Limited (a private limited company incorporated under the laws of Ireland) Cortendo AB (publ) (a public limited liability company incorporated under the laws of Sweden) Cortendo Cayman Ltd. (an exempted company incorporated in the Cayman Islands)

March 12, 2018 EX-10.29

Amendment No. 1 to Term Loan Agreement, dated January 16, 2018, by and among Strongbridge U.S. Inc., Strongbridge Biopharma plc, Cortendo Cayman Ltd., Strongbridge Ireland Limited, Cortendo AB (Publ), CRG Servicing LLC, as administrative agent and collateral agent, and the lenders listed therein

EXHIBIT 10.29 CONFIDENTIAL TREATMENT REQUESTED UNDER C.F.R. SECTIONS 200.80(b)(4), 200.83 AND 230.406. [****] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION. EXECUTION VERSION AMENDMENT 1 TO TERM LOAN AGREEMENT THIS AMENDMENT 1 TO TERM LOAN AGREEMENT, dated a

March 12, 2018 EX-10.16

Form of Incentive Stock Option Award Agreement under the Strongbridge Biopharma plc 2015 Equity Compensation Plan (incorporated by reference to Exhibit 10.16 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

Exhibit 10.16 STRONGBRIDGE BIOPHARMA PLC 2015 EQUITY COMPENSATION PLAN INCENTIVE STOCK OPTION AWARD Strongbridge Biopharma plc (the “Company”) has granted you an Incentive Stock Option (the “Option”) under the 2015 Equity Compensation Plan (the “Plan”). The terms of the grant are set forth in the Incentive Stock Option Award Agreement provided to you (the “Agreement”). The following provides a sum

March 12, 2018 EX-10.21

Form of Restricted Stock Unit Award Agreement under the Strongbridge Biopharma plc 2017 Inducement Plan (incorporated by reference to Exhibit 10.21 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

EXHIBIT 10.21 STRONGBRIDGE BIOPHARMA PLC 2017 INDUCEMENT PLAN RESTRICTED STOCK UNIT AWARD Strongbridge Biopharma plc (the “Company”) has determined to grant to you an award of restricted stock units (the “RSUs”) under the 2017 Inducement Plan (the “Plan”). The terms of the grant are set forth in the attached Restricted Stock Unit Award Agreement (the “Agreement”). The following provides a summary

March 12, 2018 EX-10.30

Form of Warrant to CR Group Lenders, dated January 16, 2018 (incorporated by reference to Exhibit 10.30 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

EXHIBIT 10.30 Exhibit I to Term Loan Agreement FORM OF WARRANT THIS WARRANT AND THE UNDERLYING SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR UNDER THE SECURITIES LAWS OF ANY STATE. THESE SECURITIES MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED EXCEPT AS PERMITTED UNDER THE ACT AND APPLICABLE STATE SECURITIES LAWS IN AC

March 12, 2018 EX-10.8

Form of Amended and Restated Employment Agreement, dated as of October 13, 2017, by and between Strongbridge U.S. Inc. and certain of its executive officers (incorporated by reference to Exhibit 10.8 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

EXHIBIT 10.8 AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (the “Agreement”) is made by and between Strongbridge U.S. Inc., a Delaware corporation (the “Company”), and (“Executive”) as of October 13, 2017. W I T N E S S E T H: WHEREAS, the Company and Executive are parties to an amended and restated employment agreement (such agreement, the “Prior Agreeme

March 12, 2018 EX-10.14

Strongbridge Biopharma plc Non-Employee Director Equity Compensation Plan

Exhibit 10.14 STRONGBRIDGE BIOPHARMA PLC NON-EMPLOYEE DIRECTOR EQUITY COMPENSATION PLAN The purpose of the Strongbridge Biopharma plc Non-Employee Director Equity Compensation Plan (the “Plan”) is to provide non-employee members of the Board of Directors (the “Board”) of Strongbridge Biopharma plc (the “Company”) with the opportunity to receive grants of nonqualified stock options and stock awards

March 12, 2018 10-K

SBBP / Strongbridge Biopharma plc 10-K (Annual Report)

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, 2017 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: 001-37

March 12, 2018 EX-10.17

Form of Nonqualified Stock Option Award Agreement under the Strongbridge Biopharma plc 2015 Equity Compensation Plan (incorporated by reference to Exhibit 10.17 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

Exhibit 10.17 STRONGBRIDGE BIOPHARMA PLC 2015 EQUITY COMPENSATION PLAN NONQUALIFIED STOCK OPTION AWARD Strongbridge Biopharma plc (the “Company”) has granted you a Nonqualified Stock Option (the “Option”) under the 2015 Equity Compensation Plan (the “Plan”). The terms of the grant are set forth in the Nonqualified Stock Option Award Agreement provided to you (the “Agreement”). The following provid

March 12, 2018 EX-10.18

Form of Restricted Stock Unit Award Agreement under the Strongbridge Biopharma plc 2015 Equity Compensation (incorporated by reference to Exhibit 10.18 to the Form 10-K (File No. 001-37569) filed with the SEC on March 12, 2018)

Exhibit 10.18 STRONGBRIDGE BIOPHARMA PLC 2015 EQUITY COMPENSATION PLAN RESTRICTED STOCK UNIT AWARD Strongbridge Biopharma plc (the “Company”) has determined to grant to you an award of restricted stock units (the “RSUs”) under the 2015 Equity Compensation Plan (the “Plan”). The terms of the grant are set forth in the attached Restricted Stock Unit Award Agreement (the “Agreement”). The following p

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