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    SEC Form SCHEDULE 13G filed by Upstream Bio Inc.

    2/14/25 5:38:41 PM ET
    $UPB
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $UPB alert in real time by email



    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549


    SCHEDULE 13G


    UNDER THE SECURITIES EXCHANGE ACT OF 1934
    Upstream Bio, Inc.

    (Name of Issuer)


    Common Stock, par value $0.001 per share

    (Title of Class of Securities)


    91678A107

    (CUSIP Number)


    12/31/2024

    (Date of Event Which Requires Filing of this Statement)


    Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
    Checkbox not checked   Rule 13d-1(b)
    Checkbox not checked   Rule 13d-1(c)
    Checkbox checked   Rule 13d-1(d)






    SCHEDULE 13G

    CUSIP No.
    91678A107


    1Names of Reporting Persons

    Decheng Capital Global Life Sciences Fund IV, L.P.
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    CAYMAN ISLANDS
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    3,085,293.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    3,085,293.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    3,085,293.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    5.8 %
    12Type of Reporting Person (See Instructions)

    PN


    SCHEDULE 13G

    CUSIP No.
    91678A107


    1Names of Reporting Persons

    Decheng Capital Management IV (Cayman), LLC
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    CAYMAN ISLANDS
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    3,085,293.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    3,085,293.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    3,085,293.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    5.8 %
    12Type of Reporting Person (See Instructions)

    OO


    SCHEDULE 13G

    CUSIP No.
    91678A107


    1Names of Reporting Persons

    Decheng Capital Global Healthcare Fund (Master), LP
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    CAYMAN ISLANDS
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    200,000.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    200,000.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    200,000.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    0.4 %
    12Type of Reporting Person (See Instructions)

    PN


    SCHEDULE 13G

    CUSIP No.
    91678A107


    1Names of Reporting Persons

    Decheng Capital Global Healthcare GP, LLC
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    CAYMAN ISLANDS
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    200,000.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    200,000.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    200,000.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    0.4 %
    12Type of Reporting Person (See Instructions)

    OO


    SCHEDULE 13G

    CUSIP No.
    91678A107


    1Names of Reporting Persons

    Xiangmin Cui
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    UNITED STATES
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    3,285,293.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    3,285,293.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    3,285,293.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    6.1 %
    12Type of Reporting Person (See Instructions)

    IN


    SCHEDULE 13G

    Item 1. 
    (a)Name of issuer:

    Upstream Bio, Inc.
    (b)Address of issuer's principal executive offices:

    890 Winter Street, Suite 200, Waltham, MA, 02451.
    Item 2. 
    (a)Name of person filing:

    The names of the persons filing this report (collectively, the "Reporting Persons") are: Decheng Capital Global Life Sciences Fund IV, L.P. ("Fund IV") Decheng Capital Management IV (Cayman), LLC ("GP IV") Decheng Capital Global Healthcare Fund (Master), LP ("Healthcare") Decheng Capital Global Healthcare GP, LLC ("Healthcare GP") Xiangmin Cui ("Dr. Cui") The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G.
    (b)Address or principal business office or, if none, residence:

    3000 Sand Hill Road, Building 2, Suite 110 Menlo Park, CA 94025
    (c)Citizenship:

    Fund IV Cayman Islands GP IV Cayman Islands Healthcare Cayman Islands Healthcare GP Cayman Islands Dr. Cui United States
    (d)Title of class of securities:

    Common Stock, par value $0.001 per share
    (e)CUSIP No.:

    91678A107
    Item 3.If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
    (a)Checkbox not checked   Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
    (b)Checkbox not checked   Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
    (c)Checkbox not checked   Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
    (d)Checkbox not checked   Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
    (e)Checkbox not checked   An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
    (f)Checkbox not checked   An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
    (g)Checkbox not checked   A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
    (h)Checkbox not checked   A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
    (i)Checkbox not checked   A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
    (j)Checkbox not checked   A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
           please specify the type of institution:
    (k)Checkbox not checked   Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
     
    Item 4.Ownership
    (a)Amount beneficially owned:

    Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference. The Reporting Persons' ownership of the Issuer's securities consists of (i) 3,085,293 shares of common stock held directly by Fund IV and (ii) 200,000 shares of common stock held directly by Healthcare. GP IV is the general partner of Fund IV and shares voting and investment authority over the shares held by Fund IV. Healthcare GP is the general partner of Healthcare and shares voting and investment authority over the shares held by Healthcare. Dr. Cui is the manager of GP IV and the indirect managing member and ultimate beneficial owner of Healthcare GP. Dr. Cui shares voting and investment authority over the shares held by each of Fund IV and Healthcare.
    (b)Percent of class:

    Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of the securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference. The percentage set forth in each row 11 is based upon 53,596,601 shares of the Issuer's common stock outstanding as of November 5, 2024, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 7, 2024.
    (c)Number of shares as to which the person has:
     (i) Sole power to vote or to direct the vote:

    Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference.

     (ii) Shared power to vote or to direct the vote:

    Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference.

     (iii) Sole power to dispose or to direct the disposition of:

    Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference.

     (iv) Shared power to dispose or to direct the disposition of:

    Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of December 31, 2024 and is incorporated by reference.

    Item 5.Ownership of 5 Percent or Less of a Class.
     
    Item 6.Ownership of more than 5 Percent on Behalf of Another Person.
     
    Not Applicable
    Item 7.Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
     
    Not Applicable
    Item 8.Identification and Classification of Members of the Group.
     
    Not Applicable
    Item 9.Notice of Dissolution of Group.
     
    Not Applicable

    Item 10.Certifications:
     
    Not Applicable

        SIGNATURE 
     
    After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

     
    Decheng Capital Global Life Sciences Fund IV, L.P.
     
    Signature:/s/ Xiangmin Cui
    Name/Title:By Decheng Capital Management IV (Cayman), LLC, its General Partner, By Xiangmin Cui, Manager
    Date:02/14/2025
     
    Decheng Capital Management IV (Cayman), LLC
     
    Signature:/s/ Xiangmin Cui
    Name/Title:By Xiangmin Cui, Manager
    Date:02/14/2025
     
    Decheng Capital Global Healthcare Fund (Master), LP
     
    Signature:/s/ Xiangmin Cui
    Name/Title:By Decheng Capital Global Healthcare GP, LLC, its General Partner, By Decheng Capital LLC, its Manager, By Xiangmin Cui, Manager
    Date:02/14/2025
     
    Decheng Capital Global Healthcare GP, LLC
     
    Signature:/s/ Xiangmin Cui
    Name/Title:By Decheng Capital LLC, its Manager, By Xiangmin Cui, Manager
    Date:02/14/2025
     
    Xiangmin Cui
     
    Signature:/s/ Xiangmin Cui
    Name/Title:Xiangmin Cui
    Date:02/14/2025
    Exhibit Information

    Exhibit 99.1 Joint Filing Agreement

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