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    Large owner Arch Venture Partners Xii, Llc converted options into 23,530,631 shares and bought $39,999,996 worth of shares (2,222,222 units at $18.00) (SEC Form 4)

    2/3/25 7:01:33 PM ET
    $MTSR
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $MTSR alert in real time by email
    SEC FORM 4 SEC Form 4
    FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
    or Section 30(h) of the Investment Company Act of 1940
    OMB APPROVAL
    OMB Number: 3235-0287
    Estimated average burden
    hours per response: 0.5
      
    Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
      
    Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
    1. Name and Address of Reporting Person*
    ARCH Venture Partners XII, LLC

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)
    2. Issuer Name and Ticker or Trading Symbol
    Metsera, Inc. [ MTSR ]
    5. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    3. Date of Earliest Transaction (Month/Day/Year)
    02/03/2025
    4. If Amendment, Date of Original Filed (Month/Day/Year)
    6. Individual or Joint/Group Filing (Check Applicable Line)
    Form filed by One Reporting Person
    X Form filed by More than One Reporting Person
    Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
    1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
    Code V Amount (A) or (D) Price
    Common Stock 02/03/2025 C 16,006,949 A (1) 17,070,904 I See Footnote(2)
    Common Stock 02/03/2025 C 7,523,682 A (1) 7,523,682 I See Footnote(3)(4)
    Common Stock 02/03/2025 P 1,432,224 A $18 18,503,128 I See Footnote(2)
    Common Stock 02/03/2025 P 789,998 A $18 8,313,680 I See Footnote(3)(4)
    Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
    (e.g., puts, calls, warrants, options, convertible securities)
    1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
    Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
    Series Seed Preferred Stock (1) 02/03/2025 C 19,933,333 (1) (1) Common Stock 8,483,268 (1) 0 I See Footnote(2)
    Series A Convertible Preferred Stock (1) 02/03/2025 C 15,000,000 (1) (1) Common Stock 6,383,730 (1) 0 I See Footnote(2)
    Series B Convertible Preferred Stock (1) 02/03/2025 C 2,678,571 (1) (1) Common Stock 1,139,951 (1) 0 I See Footnote(2)
    Series A Convertible Preferred Stock (1) 02/03/2025 C 15,000,000 (1) (1) Common Stock 6,383,731 (1) 0 I See Footnote(3)(4)
    Series B Convertible Preferred Stock (1) 02/03/2025 C 2,678,571 (1) (1) Common Stock 1,139,951 (1) 0 I See Footnote(3)(4)
    1. Name and Address of Reporting Person*
    ARCH Venture Partners XII, LLC

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    ARCH Venture Fund XII, L.P.

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    ARCH Venture Partners XII, L.P.

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    ARCH Venture Fund XIII, L.P.

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    ARCH Venture Partners XIII, L.P.

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    ARCH Venture Partners XIII, LLC

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    CRANDELL KEITH

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    GILLIS STEVEN

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    1. Name and Address of Reporting Person*
    NELSEN ROBERT

    (Last) (First) (Middle)
    8755 W. HIGGINS ROAD, SUITE 1025

    (Street)
    CHICAGO IL 60631

    (City) (State) (Zip)

    Relationship of Reporting Person(s) to Issuer
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    Explanation of Responses:
    1. The shares of Issuer's preferred stock have no expiration date and are convertible at the holder's election into Issuer's common stock at a conversion ratio of 1-for-2.349723. The preferred stock automatically converted into shares of the Issuer's common stock, for no additional consideration, upon the closing of the Issuer's initial public offering.
    2. Represents shares held directly by ARCH Venture Fund XII, L.P ("ARCH Venture Fund XII"). ARCH Venture Partners XII, L.P. ("AVP XII LP"), as the sole general partner of ARCH Venture Fund XII, may be deemed to beneficially own the shares held by ARCH Venture Fund XII. ARCH Venture Partners XII, LLC ("AVP XII LLC"), as the sole general partner of AVP XII LP, may be deemed to beneficially own the shares held by ARCH Venture Fund XII. AVP XII LP and AVP XII LLC disclaim beneficial ownership except to the extent of any pecuniary interest therein. As members of the investment committee of AVP XII LLC, each of Kristina M. Burow, Keith Crandell, Steven Gillis and Robert Nelsen (the "AVP XII Committee Members") may also be deemed to share the power to direct the disposition and vote of the ARCH Venture Fund XII shares. Each AVP XII Committee Member disclaims beneficial ownership except to the extent of any pecuniary interest therein.
    3. Represents shares held directly by ARCH Venture Fund XIII, L.P.("ARCH Venture Fund XIII"). ARCH Venture Partners XIII, L.P. ("AVP XIII LP"), as the sole general partner of ARCH Venture Fund XIII, may be deemed to beneficially own the shares held by ARCH Venture Fund XIII. ARCH Venture Partners XIII, LLC ("AVP XIII LLC"), as the sole general partner of AVP XIII LP, may be deemed to beneficially own the shares held by ARCH Venture Fund XIII. AVP XIII LP and AVP XIII LLC disclaim beneficial ownership except to the extent of any pecuniary interest therein. As members of the investment committee of AVP XIII LLC, each of Paul L. Berns, Kristina M. Burow, Keith Crandell, Steven Gillis and Robert Nelsen (the "AVP XIII Committee Members") may also be deemed to share the power to direct the disposition and vote of the ARCH Venture Fund XIII shares. Each AVP XIII Committee Member disclaims beneficial ownership except to the extent of any pecuniary interest therein.
    4. (Continued from footnote 3) Each of Kristina Burow and Paul Berns has filed a separate Form 4.
    ARCH Venture Fund XII, L.P. By: ARCH Venture Partners XII, L.P., its General Partner By: ARCH Venture Partners XII, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    ARCH Venture Partners XII, L.P. By: ARCH Venture Partners XII, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    ARCH Venture Partners XII, LLC By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    ARCH Venture Fund XIII, L.P. By: ARCH Venture Partners XIII, L.P., its General Partner By: ARCH Venture Partners XIII, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    ARCH Venture Partners XIII, L.P. By: ARCH Venture Partners XIII, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    ARCH Venture Partners XIII, LLC By: /s/ Mark McDonnell, as Attorney-in-Fact 02/03/2025
    /s/ Keith Crandell, By: Mark McDonnell, attorney-in-fact 02/03/2025
    /s/ Steven Gillis, By: Mark McDonnell, attorney-in-fact 02/03/2025
    /s/ Robert Nelsen, By: Mark McDonnell, attorney-in-fact 02/03/2025
    ** Signature of Reporting Person Date
    Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
    * If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
    ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
    Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
    Get the next $MTSR alert in real time by email

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