0000950123-20-004636.txt : 20200513 0000950123-20-004636.hdr.sgml : 20200513 20200513112500 ACCESSION NUMBER: 0000950123-20-004636 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20200331 FILED AS OF DATE: 20200513 DATE AS OF CHANGE: 20200513 EFFECTIVENESS DATE: 20200513 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: 20871639 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 false true false 0001263048 XXXXXXXX 03-31-2020 03-31-2020 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 05-12-2020 0 5 164386 false INFORMATION TABLE 2 form13fInfoTable.xml INFORMATION TABLE FOR FORM 13F Chiasma, Inc. Common 16706W102 20937 5736296 SH SOLE 5736296 0 0 Harpoon Therapeutics, Inc. Common 41358P106 52393 4524425 SH SOLE 4524425 0 0 Rhythm Pharmaceuticals, Inc. Common 76243J105 35911 2359463 SH SOLE 2359463 0 0 Syndax Pharmaceuticals, Inc. Common 87164F105 23791 2168691 SH SOLE 2168691 0 0 TCR2 Therapeutics, Inc. Common 87808K106 31354 4050865 SH SOLE 4050865 0 0