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    SEC Form S-8 filed by Rhythm Pharmaceuticals Inc.

    2/26/26 5:16:44 PM ET
    $RYTM
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $RYTM alert in real time by email
    S-8 1 rytm-20260226xsx8.htm S-8 Document

    As filed with the Securities and Exchange Commission on February 26, 2026

    Registration No. 333-
    UNITED STATES
    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549
    FORM S-8
    REGISTRATION STATEMENT
    UNDER
    THE SECURITIES ACT OF 1933
    Rhythm Pharmaceuticals, Inc.
    (Exact name of registrant as specified in its charter)
    Delaware46-2159271
    (State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.)
    222 Berkeley Street
    12th Floor
    Boston, MA 02116
    (857) 264-4280
    (Address of Principal Executive Offices) (Zip Code)
    Rhythm Pharmaceuticals, Inc. 2017 Equity Incentive Plan
    (Full title of the plan)
    David P. Meeker, M.D.
    Chief Executive Officer, President and Chairman of the Board
    Rhythm Pharmaceuticals, Inc.
    222 Berkeley Street
    12th Floor
    Boston, MA 02116
    (857) 264-4280
    (Name and address of agent for service) (Telephone number, including area code, of agent for service)
    With copies to:
    Peter N. Handrinos, Esq.
    Latham & Watkins LLP
    John Hancock Tower
    200 Clarendon Street
    Boston, MA 02116
    (617) 948-6060
    Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.



    Large accelerated filer x
    Accelerated filer ¨
    Non-accelerated filer ¨
    Smaller reporting company ¨
    Emerging growth company ¨
    If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act. ¨
    EXPLANATORY NOTE
    This Registration Statement on Form S-8 is being filed for the purpose of registering an additional 2,688,212 shares of the Registrant’s common stock to be issued pursuant to the Rhythm Pharmaceuticals, Inc. 2017 Equity Incentive Plan (the “Incentive Plan”). A Registration Statement of the Registrant on Form S-8 relating to the Incentive Plan is effective.

    INCORPORATION BY REFERENCE OF CONTENTS OF REGISTRATION STATEMENTS ON FORM S-8
    The contents of the Registration Statements on Form S-8 (File Nos. 333-220925, 333-223647, 333-229642, 333-236829, 333-253709, 333-263168, 333-270231, 333-277539, and 333-285411, including any amendments thereto, filed with the Securities and Exchange Commission, relating to the Incentive Plan, are incorporated herein by reference.

    Item 8. Exhibits
    Exhibit
     Number
    Description
    4.1
    Amended and Restated Certificate of Incorporation of Rhythm Pharmaceuticals, Inc. and Certificate of Amendment (incorporated by reference to Exhibit 3.1 to Rhythm Pharmaceuticals, Inc.’s Current Report on Form 8-K (File No. 001-38223) filed on June 26, 2025)
    4.2
    Amended and Restated Certificate of Designations of Rhythm Pharmaceuticals, Inc. (incorporated by reference to Exhibit 3.4 to Rhythm Pharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (File No. 001 38223) filed on May 7, 2024)
    4.3
    Amended and Restated Bylaws of Rhythm Pharmaceuticals, Inc. (incorporated by reference to Exhibit 3.1 to Rhythm Pharmaceuticals, Inc.’s Current Report on Form 8-K (File No. 001-38223) filed on December 18, 2023)
    5.1*
    Opinion of Latham & Watkins LLP
    23.1*
    Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm
    23.2*
    Consent of Latham & Watkins LLP (included in Exhibit 5.1)
    24.1*
    Power of Attorney (included on signature page)
    99.1
    Rhythm Pharmaceuticals, Inc. 2017 Equity Incentive Plan and Form of Option Agreement (incorporated by reference to Exhibit 10.2 to Rhythm Pharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (File No. 001-38223) filed on November 14, 2017)
    99.2
    2017 Equity Incentive Plan Form of Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.18 to Rhythm Pharmaceuticals, Inc.’s Annual Report on Form 10-K (File No. 001-38223) filed on March 2, 2020)
    99.3
    2017 Equity Incentive Plan Performance Unit Agreement (incorporated by reference to Exhibit 10.4 to Rhythm Pharmaceuticals, Inc.’s Quarterly Report on Form 10 Q (File No. 001 38223) filed on May 7, 2024)
    107.1*
    Filing Fee Table
    * Filed herewith.



    SIGNATURES
    Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth of Massachusetts, on February 26, 2026.
    RHYTHM PHARMACEUTICALS, INC.
    By:/s/ David P. Meeker, M.D.
    David P. Meeker, M.D.
    Chief Executive Officer, President and Chairman of the Board
    POWER OF ATTORNEY
    Each person whose signature appears below hereby constitutes and appoints David P. Meeker, M.D. and Hunter C. Smith, or each of them singly, with full power to act without the other, such person’s true and lawful attorneys-in-fact and agents, with full power of substitution and re-substitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign this registration statement and any and all amendments, including post-effective amendments to this registration statement, and to file the same, with exhibits and schedules thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary or desirable to be done in connection therewith as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his or her substitute or substitutes may lawfully do or cause to be done by virtue hereof.
    Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the date indicated.
    SignatureTitleDate
    /s/ David P. Meeker, M.D.Chief Executive Officer, President and Director
    February 26, 2026
    David P. Meeker, M.D.(Principal Executive Officer)
    /s/ Hunter C. SmithChief Financial Officer
    February 26, 2026
    Hunter C. Smith(Principal Financial Officer)
    /s/ Christopher P. GermanCorporate Controller
    February 26, 2026
    Christopher P. German(Principal Accounting Officer)
    /s/ Edward T. MathersLead Director
    February 26, 2026
    Edward T. Mathers
    /s/ Stuart ArbuckleDirector
    February 26, 2026
    Stuart Arbuckle
    /s/ Jennifer L. GoodDirector
    February 26, 2026
    Jennifer L. Good
    /s/ Christophe R. JeanDirector
    February 26, 2026
    Christophe R. Jean
    /s/ David W. J. McGirrDirector
    February 26, 2026
    David W. J. McGirr
    /s/ Lynn A. Tetrault, J.D.Director
    February 26, 2026
    Lynn A. Tetrault, J.D.




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