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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

Filings

Every filing of this filer: 13F reports and notices, the 13D and 13G it filed or is a reporting person of, and Forms 3, 4 and 5 it reported as an owner.

FilingSubjectFiledAcceptedIngested
13F-HR 0001193125-25-283116 Quarter ended 2025-09-302025-11-14acceptance time not in the bulk data set
13F-HR 0000950123-25-008430 Quarter ended 2025-06-302025-08-14acceptance time not in the bulk data set
13F-HR 0000950123-25-005757 Quarter ended 2025-03-312025-05-15acceptance time not in the bulk data set
13F-HR 0000950123-25-002793 Quarter ended 2024-12-312025-02-14acceptance time not in the bulk data set
13F-HR 0000950123-24-011020 Quarter ended 2024-09-302024-11-13acceptance time not in the bulk data set
13F-HR 0000950123-24-008624 Quarter ended 2024-06-302024-08-14acceptance time not in the bulk data set
13F-HR 0000950123-24-005709 Quarter ended 2024-03-312024-05-15acceptance time not in the bulk data set
13F-HR 0000950123-24-001862 Quarter ended 2023-12-312024-02-13acceptance time not in the bulk data set
13F-HR 0000950123-23-010947 Quarter ended 2023-09-302023-11-14acceptance time not in the bulk data set
13F-HR/A 0000950123-23-008457 Quarter ended 2023-06-302023-09-07acceptance time not in the bulk data set
13F-HR 0000950123-23-007830 Quarter ended 2023-06-302023-08-14acceptance time not in the bulk data set
13F-HR 0000950123-23-004667 Quarter ended 2023-03-312023-05-12acceptance time not in the bulk data set
13F-HR 0000950123-23-002466 Quarter ended 2022-12-312023-02-14acceptance time not in the bulk data set
13F-HR 0000950123-22-011903 Quarter ended 2022-09-302022-11-14acceptance time not in the bulk data set
13F-HR 0000950123-22-008457 Quarter ended 2022-06-302022-08-11acceptance time not in the bulk data set
13F-HR 0000950123-22-005663 Quarter ended 2022-03-312022-05-13acceptance time not in the bulk data set
13F-HR 0000950123-22-002230 Quarter ended 2021-12-312022-02-11acceptance time not in the bulk data set
13F-HR 0000950123-21-015021 Quarter ended 2021-09-302021-11-15acceptance time not in the bulk data set
13F-HR 0000950123-21-010733 Quarter ended 2021-06-302021-08-13acceptance time not in the bulk data set
13F-HR 0000950123-21-006304 Quarter ended 2021-03-312021-05-13acceptance time not in the bulk data set
13F-HR 0000950123-21-002275 Quarter ended 2020-12-312021-02-16acceptance time not in the bulk data set
13F-HR 0000950123-20-011704 Quarter ended 2020-09-302020-11-13acceptance time not in the bulk data set
13F-HR 0000950123-20-008316 Quarter ended 2020-06-302020-08-12acceptance time not in the bulk data set
13F-HR 0000950123-20-004636 Quarter ended 2020-03-312020-05-13acceptance time not in the bulk data set
13F-HR 0000950123-20-002307 Quarter ended 2019-12-312020-02-14acceptance time not in the bulk data set
13F-HR 0000950123-19-011121 Quarter ended 2019-09-302019-11-14acceptance time not in the bulk data set
13F-HR 0000950123-19-008112 Quarter ended 2019-06-302019-08-14acceptance time not in the bulk data set
13F-HR/A 0000950123-19-005747 Quarter ended 2019-03-312019-05-29acceptance time not in the bulk data set
13F-HR 0000950123-19-004578 Quarter ended 2019-03-312019-05-13acceptance time not in the bulk data set
13F-HR 0000950123-19-001536 Quarter ended 2018-12-312019-02-13acceptance time not in the bulk data set
13F-HR 0000950123-18-011743 Quarter ended 2018-09-302018-11-14acceptance time not in the bulk data set
13F-HR 0000950123-18-008232 Quarter ended 2018-06-302018-08-13acceptance time not in the bulk data set
13F-HR 0000950123-18-004893 Quarter ended 2018-03-312018-05-11acceptance time not in the bulk data set
13F-HR 0000950123-18-000708 Quarter ended 2017-12-312018-02-02acceptance time not in the bulk data set
13F-HR 0000950123-17-010246 Quarter ended 2017-09-302017-11-13acceptance time not in the bulk data set
13F-HR 0000950123-17-006941 Quarter ended 2017-06-302017-08-09acceptance time not in the bulk data set
13F-HR 0000950123-17-005003 Quarter ended 2017-03-312017-05-15acceptance time not in the bulk data set
13F-HR 0000950123-17-000972 Quarter ended 2016-12-312017-02-07acceptance time not in the bulk data set
13F-HR 0000950123-16-021719 Quarter ended 2016-09-302016-11-10acceptance time not in the bulk data set
13F-HR 0000950123-16-018966 Quarter ended 2016-06-302016-08-08acceptance time not in the bulk data set
13F-HR 0000950123-16-016678 Quarter ended 2016-03-312016-05-11acceptance time not in the bulk data set
13F-HR 0000950123-16-013404 Quarter ended 2015-12-312016-02-04acceptance time not in the bulk data set
13F-HR 0000950123-15-011440 Quarter ended 2015-09-302015-11-12acceptance time not in the bulk data set
13F-HR 0000950123-15-007803 Quarter ended 2015-06-302015-07-29acceptance time not in the bulk data set
13F-HR 0000950123-15-004661 Quarter ended 2015-03-312015-04-27acceptance time not in the bulk data set
13F-HR 0000950123-15-000694 Quarter ended 2014-12-312015-02-02acceptance time not in the bulk data set
13F-HR 0000950123-14-010421 Quarter ended 2014-09-302014-10-23acceptance time not in the bulk data set
13F-HR 0000950123-14-007200 Quarter ended 2014-06-302014-07-17acceptance time not in the bulk data set
13F-HR 0000950123-14-005089 Quarter ended 2014-03-312014-05-08acceptance time not in the bulk data set
13F-HR 0000950123-14-000466 Quarter ended 2013-12-312014-01-23acceptance time not in the bulk data set
13F-HR 0000950123-13-010051 Quarter ended 2013-09-302013-11-26acceptance time not in the bulk data set
13F-HR 0000950123-13-005624 Quarter ended 2013-06-302013-08-08acceptance time not in the bulk data set