0001104659-21-128646.txt : 20211021 0001104659-21-128646.hdr.sgml : 20211021 20211021205122 ACCESSION NUMBER: 0001104659-21-128646 CONFORMED SUBMISSION TYPE: 3 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20211021 FILED AS OF DATE: 20211021 DATE AS OF CHANGE: 20211021 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Rock Springs Capital Management LP CENTRAL INDEX KEY: 0001595725 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40925 FILM NUMBER: 211338461 BUSINESS ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 4102200129 MAIL ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Rock Springs Capital Master Fund LP CENTRAL INDEX KEY: 0001735393 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40925 FILM NUMBER: 211338459 BUSINESS ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 410-220-0142 MAIL ADDRESS: STREET 1: 190 ELGIN AVENUE CITY: GEORGE TOWN STATE: E9 ZIP: KY1 9001 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Four Pines Master Fund LP CENTRAL INDEX KEY: 0001888685 STATE OF INCORPORATION: E9 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40925 FILM NUMBER: 211338458 BUSINESS ADDRESS: STREET 1: 190 ELGIN AVENUE CITY: GEORGE TOWN STATE: E9 ZIP: KY1-9008 BUSINESS PHONE: 410-220-0130 MAIL ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Rock Springs Capital LLC CENTRAL INDEX KEY: 0001735397 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40925 FILM NUMBER: 211338460 BUSINESS ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 410-220-0142 MAIL ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Xilio Therapeutics, Inc. CENTRAL INDEX KEY: 0001840233 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 851623397 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 828 WINTER STREET CITY: WALTHAM STATE: MA ZIP: 02451 BUSINESS PHONE: 617-833-1027 MAIL ADDRESS: STREET 1: 828 WINTER STREET CITY: WALTHAM STATE: MA ZIP: 02451 3 1 tm2130646-15_3seq1.xml OWNERSHIP DOCUMENT X0206 3 2021-10-21 0 0001840233 Xilio Therapeutics, Inc. XLO 0001595725 Rock Springs Capital Management LP 650 SOUTH EXETER ST., SUITE 1070 BALTIMORE MD 21202 0 0 1 0 0001735397 Rock Springs Capital LLC 650 SOUTH EXETER ST., SUITE 1070 BALTIMORE MD 21202 0 0 1 0 0001735393 Rock Springs Capital Master Fund LP 190 ELGIN AVENUE GEORGE TOWN E9 KY1 9001 CAYMAN ISLANDS 0 0 1 0 0001888685 Four Pines Master Fund LP 650 SOUTH EXETER ST., SUITE 1070 BALTIMORE MD 21202 0 0 1 0 Series C Preferred Stock Common Stock 756472 I See footnote Series C Preferred Stock Common Stock 151294 I See footnote The Series C Preferred Stock automatically converts into the number of shares of Common Stock as shown in Column 3 without payment of further consideration at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date. The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the Series C Preferred Stock held directly by Master Fund. The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the Series C Preferred Stock held directly by Four Pines. By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital Management LP 2021-10-21 By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital LLC 2021-10-21 By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital Master Fund LP 2021-10-21 By: /s/ Mark Bussard, Authorized Signatory, Four Pines Master Fund LP 2021-10-21