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MPM ASSET MANAGEMENT LLC

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13F filer, CIK 1263048, BOSTON, MA

MPM ASSET MANAGEMENT LLC reported $44,506,160 across 4 holdings for the quarter ended 2025-09-30, in a 13F-HR filed 2025-11-14.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001193125-25-283116

Period
2025-09-30
Reported value
$44.5M
Holdings
4
Top 10 weight
100%
New
0
Sold out
1

Largest buys vs the previous quarter

None.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
ADAPYexited-4,809,677-$1.15M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q3 2025

Share positions as resolved from 13F-HR 0001193125-25-283116, largest first. % of portfolio is the value over $44,506,160, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
TRDAENTRADA THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: 4,425,784 shares; 2024Q1: 4,425,784 shares; 2024Q2: 4,425,784 shares; 2024Q3: 4,425,784 shares; 2024Q4: 4,381,062 shares; 2025Q1: 4,381,062 shares; 2025Q2: 4,381,062 shares; 2025Q3: 4,381,062 shares 4,381,062$25.4M57.09%0Timeline
DYNDYNE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: 4,951,303 shares; 2024Q1: 3,451,303 shares; 2024Q2: 1,561,496 shares; 2024Q3: 682,376 shares; 2024Q4: 682,376 shares; 2025Q1: 682,376 shares; 2025Q2: 682,376 shares; 2025Q3: 682,376 shares 682,376$8.63M19.4%0Timeline
HOWLWEREWOLF THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: 4,284,172 shares; 2024Q1: 4,284,172 shares; 2024Q2: 4,284,172 shares; 2024Q3: 4,284,172 shares; 2024Q4: 4,284,172 shares; 2025Q1: 4,309,860 shares; 2025Q2: 4,309,860 shares; 2025Q3: 4,309,860 shares 4,309,860$8.49M19.08%0Timeline
REPARE THERAPEUTICS INCREPARE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: 2,242,636 shares; 2024Q1: 2,242,636 shares; 2024Q2: 2,242,636 shares; 2024Q3: 2,242,636 shares; 2024Q4: 1,683,707 shares; 2025Q1: 1,121,318 shares; 2025Q2: 1,121,318 shares; 2025Q3: 1,121,318 shares 1,121,318$1.97M4.43%0

Sold out in Q3 2025

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
ADAPYADAPTIMMUNE THERAPEUTICS PLC S4,809,677$1.15Mshares

How Q3 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001193125-25-283116 base2025-11-14acceptance time not in the bulk data set