0000950123-19-005747.txt : 20190529 0000950123-19-005747.hdr.sgml : 20190529 20190529104030 ACCESSION NUMBER: 0000950123-19-005747 CONFORMED SUBMISSION TYPE: 13F-HR/A PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20190331 FILED AS OF DATE: 20190529 DATE AS OF CHANGE: 20190529 EFFECTIVENESS DATE: 20190529 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/A SEC ACT: 1934 Act SEC FILE NUMBER: 028-13379 FILM NUMBER: 19860248 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/A 1 primary_doc.xml 13F-HR/A LIVE false true false 0001263048 XXXXXXXX 03-31-2019 03-31-2019 true 1 RESTATEMENT 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 05-24-2019 0 7 242512 false INFORMATION TABLE 2 form13fInfoTable.xml INFORMATION TABLE FOR FORM 13F Aratana Therapeutics, Inc. Common 03874P101 900 250000 SH SOLE 250000 0 0 Chiasma, Inc. Common 16706W102 29829 5736296 SH SOLE 5736296 0 0 Conatus Pharmaceuticals, Inc. Common 20600T108 2662 2464807 SH SOLE 2464807 0 0 Harpoon Therapeutics, Inc. Common 41358P106 42846 4524425 SH SOLE 4524425 0 0 Rhythm Pharmaceuticals, Inc. Common 76243J105 84283 3074893 SH SOLE 3074893 0 0 Syndax Pharmaceuticals, Inc. Common 87164F105 11386 2168691 SH SOLE 2168691 0 0 TCR2 Therapeutics, Inc. Common 87808K106 70607 4050865 SH SOLE 4050865 0 0