0000899243-21-040255.txt : 20211014 0000899243-21-040255.hdr.sgml : 20211014 20211014170028 ACCESSION NUMBER: 0000899243-21-040255 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20211012 FILED AS OF DATE: 20211014 DATE AS OF CHANGE: 20211014 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: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40869 FILM NUMBER: 211323848 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: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40869 FILM NUMBER: 211323847 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: Rock Springs Capital LLC CENTRAL INDEX KEY: 0001735397 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40869 FILM NUMBER: 211323843 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: Theseus Pharmaceuticals, Inc. CENTRAL INDEX KEY: 0001745020 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 830712806 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 245 MAIN STREET CITY: CAMBRIDGE STATE: MA ZIP: 02142 BUSINESS PHONE: (857) 400-9491 MAIL ADDRESS: STREET 1: 245 MAIN STREET CITY: CAMBRIDGE STATE: MA ZIP: 02142 4 1 doc4.xml FORM 4 SUBMISSION X0306 4 2021-10-12 1 0001745020 Theseus Pharmaceuticals, Inc. THRX 0001595725 Rock Springs Capital Management LP 650 SOUTH EXETER ST., SUITE 1070 BALTIMORE MD 21202 0 0 1 0 0001735393 Rock Springs Capital Master Fund LP C/O WALKERS CORPORATE LIMITED, CAYMAN CO CENTER 27 HOSPITAL ROAD GEORAGE TOWN E9 KY-1-9008 CAYMAN ISLANDS 0 0 1 0 0001735397 Rock Springs Capital LLC 650 SOUTH EXETER ST., SUITE 1070 BALTIMORE MD 2102 0 0 1 0 Common Stock 2021-10-12 4 C 0 349320 A 349320 I See Footnote Common Stock 2021-10-12 4 C 0 87329 A 87329 I See Footnote Common Stock 2021-10-12 4 P 0 250000 16.00 A 599320 I See Footnote Series B Convertible Preferred Stock 2021-10-12 4 C 0 349320 D Common Stock 349320 0 I See Footnote Series B Convertible Preferred Stock 2021-10-12 4 C 0 87329 D Common Stock 87329 0 I See Footnote The total represents shares received upon conversion of shares of Series B Convertible Preferred Stock. The reported security converted into the issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the issuer's initial public offering without payment of further consideration. 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 shares 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 shares held directly by Four Pines. Represents shares purchased in the issuer's initial public offering. By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital Management LP 2021-10-14 By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital Master Fund LP 2021-10-14 By: /s/ Mark Bussard, Authorized Signatory, Rock Springs Capital LLC 2021-10-14