0000950123-20-011704.txt : 20201113 0000950123-20-011704.hdr.sgml : 20201113 20201113120551 ACCESSION NUMBER: 0000950123-20-011704 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20200930 FILED AS OF DATE: 20201113 DATE AS OF CHANGE: 20201113 EFFECTIVENESS DATE: 20201113 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MPM ASSET MANAGEMENT LLC CENTRAL INDEX KEY: 0001263048 IRS NUMBER: 043351032 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-13379 FILM NUMBER: 201310135 BUSINESS ADDRESS: STREET 1: 450 KENDALL STREET CITY: CAMBRIDGE STATE: MA ZIP: 02142 BUSINESS PHONE: 6174259200 MAIL ADDRESS: STREET 1: 450 KENDALL STREET CITY: CAMBRIDGE STATE: MA ZIP: 02142 13F-HR 1 primary_doc.xml 13F-HR LIVE 0001263048 XXXXXXXX 09-30-2020 09-30-2020 false MPM ASSET MANAGEMENT LLC

450 KENDALL STREET CAMBRIDGE MA 02142

13F HOLDINGS REPORT 028-13379 N Ansbert Gadicke (617) 425-9200 /s/Ansbert Gadicke Cambridge MA 11-12-2020 0 8 536268 false INFORMATION TABLE 2 1813.xml INFORMATION TABLE FOR FORM 13F Chiasma, Inc. Common 16706W102 24666 5736296 SH SOLE 5736296 0 0 Dyne Therapeutics, Inc. Common 26818M108 99967 4951303 SH SOLE 4951303 0 0 Harpoon Therapeutics, Inc. Common 41358P106 76870 4524425 SH SOLE 4524425 0 0 iTeos Therapeutics, Inc. Common 46565G104 91443 3706663 SH SOLE 3706663 0 0 Repare Therapeutics, Inc. Common 760273102 92426 3003772 SH SOLE 3003772 0 0 Rhythm Pharmaceuticals, Inc. Common 76243J105 41374 1909258 SH SOLE 1909258 0 0 Syndax Pharmaceuticals, Inc. Common 87164F105 27208 1843388 SH SOLE 1843388 0 0 TCR2 Therapeutics, Inc. Common 87808K106 82314 4050865 SH SOLE 4050865 0 0