SC 13G/A: Xilio Therapeutics, Inc.

AI Summary

SC 13G/A filing by Xilio Therapeutics, Inc..

Risk Assessment

Risk Level: low

Key Financial Figures

• $0.0001 — me of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securiti

Filing Documents

• rocksprings-xlo032724a1.htm (SC 13G/A) — 107KB
• 0001172661-24-001733.txt ( ) — 108KB

(a)Name of Issuer

Item 1. (a)Name of Issuer Xilio Therapeutics, Inc. (the “Issuer”) (b)Address of Issuer’s Principal Executive Offices 828 Winter Street, Suite 300 Waltham, Massachusetts 02451

(a)Name of Person Filing

Item 2. (a)Name of Person Filing This i. Rock Springs Capital Management LP (“RSCM”); ii. Rock Springs Capital LLC (“RSC”); and iii. Rock Springs Capital Master Fund LP (“Master Fund”). This partnership, and Four Pines Master Fund LP (“Four Pines”), which is a Cayman Islands exempted limited partnership, and indirectly held by RSCM, a Delaware limited partnership, and RSC, a Delaware limited liability company. RSCM serves as the investment manager to each of the Master Fund and Four Pines. RSC is the general partner of RSCM. (b)Address of Principal Business Office, or, if none, Residence Rock Springs Capital Management LP and Rock Springs Capital LLC 650 South Exeter, Suite 1070 Baltimore, MD 21202 (c)Citizenship Rock Springs Capital Management LP - Delaware Rock Springs Capital LLC - Delaware Rock Springs Capital Master Fund LP - Cayman Islands (d)Title of Class of Securities Common Stock, par value $0.0001 per share (the “Shares”) (e) CUSIP No.: 98422T100 CUSIP No. 98422T100 Schedule 13G/A/A Page 6 of 9 Pages

If

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) Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o); (b) Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c); (c) Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c); (d) Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8); (e) x An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E); (f) An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F); (g) x A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G); (h) A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) 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) A non-U.S. institution in accordance with 240.13d-1(b)(1)(ii)(J); (k) A group, in accordance with 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with 240.13d-1(b)(1)(ii)(J), please specify the type of institution: CUSIP No. 98422T100 Schedule 13G/A/A Page 7 of 9 Pages Item 4.Ownership Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. As of the date of this filing, the Reporting Persons may be deemed to be the beneficial owners of 3,003,259 Shares, which amount includes 2,600,625 Shares directly beneficially owned by the Master Fund, and 402,634 Shares directly beneficially owned by Four Pines. The percent of class is determined by dividing the number of Shares beneficially owned by the Reporting Persons by 34,473,486 as reported on the Issuer’s Form 10-K filed on April 1, 2024. (a) Amount beneficially owned: Rock

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