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    SEC Form SCHEDULE 13G filed by Xilio Therapeutics Inc.

    5/15/26 4:38:51 PM ET
    $XLO
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $XLO alert in real time by email



    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549


    SCHEDULE 13G


    UNDER THE SECURITIES EXCHANGE ACT OF 1934
    Xilio Therapeutics, Inc.

    (Name of Issuer)


    Common Stock, par value $0.0001 per share

    (Title of Class of Securities)




    28422T209

    (CUSIP Number)
    03/31/2026

    (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 checked   Rule 13d-1(b)
    Checkbox not checked   Rule 13d-1(c)
    Checkbox not checked   Rule 13d-1(d)




    schemaVersion:


    SCHEDULE 13G

    CUSIP Number(s):
    28422T209


    1Names of Reporting Persons

    ORBIMED ADVISORS LLC
    2Check the appropriate box if a member of a Group (see instructions)

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

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

    0.00
    6Shared Voting Power

    642,000.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    642,000.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    642,000.00
    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)

    9.99 %
    12Type of Reporting Person (See Instructions)

    IA


    SCHEDULE 13G

    CUSIP Number(s):
    28422T209


    1Names of Reporting Persons

    OrbiMed Capital GP X LLC
    2Check the appropriate box if a member of a Group (see instructions)

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

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

    0.00
    6Shared Voting Power

    481,500.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    481,500.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    481,500.00
    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)

    7.49 %
    12Type of Reporting Person (See Instructions)

    OO


    SCHEDULE 13G

    Item 1. 
    (a)Name of issuer:

    Xilio Therapeutics, Inc.
    (b)Address of issuer's principal executive offices:

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

    OrbiMed Advisors LLC ("OrbiMed Advisors"), a limited liability company organized under the laws of Delaware and a registered investment adviser under the Investment Advisers Act of 1940, as amended. OrbiMed Capital GP X LLC ("OrbiMed GP" and together with OrbiMed Advisors, the "Reporting Persons"), a limited liability company organized under the laws of Delaware.
    (b)Address or principal business office or, if none, residence:

    601 Lexington Avenue, 54th Floor New York, NY 10022
    (c)Citizenship:

    Please refer to Item 4 on each cover sheet for each filing person.
    (d)Title of class of securities:

    Common Stock, par value $0.0001 per share
    (e)CUSIP Number(s):

    28422T209
    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 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:

    OrbiMed Advisors: 642,000 OrbiMed GP: 481,500
    (b)Percent of class:

    OrbiMed Advisors: 9.99% OrbiMed GP: 7.49%
    (c)Number of shares as to which the person has:
     (i) Sole power to vote or to direct the vote:

    OrbiMed Advisors: 0 OrbiMed GP: 0

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

    OrbiMed Advisors: 642,000 OrbiMed GP: 481,500

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

    OrbiMed Advisors: 0 OrbiMed GP: 0

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

    OrbiMed Advisors: 642,000 OrbiMed GP: 481,500

    Item 5.Ownership of 5 Percent or Less of a Class.
     
    Not Applicable
    Item 6.Ownership of more than 5 Percent on Behalf of Another Person.
     
    If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.


    The Reporting Persons hold 9.99% of the shares of Common Stock upon conversion of warrants in the aggregate on behalf of other persons who have the right to receive or the power to direct the receipt of dividends from, or proceeds from the sale of, such securities. OrbiMed Advisors exercises investment and voting power over the shares of Common Stock through a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of the shares of Common Stock reported herein.
    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:
     
    By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

        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.

     
    ORBIMED ADVISORS LLC
     
    Signature:/s/ Carl L. Gordon
    Name/Title:Carl L. Gordon/Member
    Date:05/15/2026
     
    OrbiMed Capital GP X LLC
     
    Signature:/s/ Carl L. Gordon
    Name/Title:Carl L. Gordon/Member of OrbiMed Advisors LLC
    Date:05/15/2026
    Get the next $XLO alert in real time by email

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