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MPM ASSET MANAGEMENT LLC

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13F filer, CIK 1263048, BOSTON, MA

MPM ASSET MANAGEMENT LLC reported $203,501,091 across 7 holdings for the quarter ended 2023-12-31, in a 13F-HR filed 2024-02-13.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000950123-24-001862

Period
2023-12-31
Reported value
$204M
Holdings
7
Top 10 weight
100%
New
1
Sold out
1

Largest buys vs the previous quarter

SecurityShares changeApprox. value
HARPOON THERAPEUTICS INCnew+313,136$3.56M

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.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
HARPOON THERAPEUTICS INCexited-313,136-$1.26M
ADAPYreduced-731,640-$580K

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, Q4 2023

Share positions as resolved from 13F-HR 0000950123-24-001862, largest first. % of portfolio is the value over $203,501,091, 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; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 4,425,784 shares 4,425,784$66.8M32.82%0Timeline
DYNDYNE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 4,951,303 shares 4,951,303$65.9M32.36%0Timeline
ITEOS THERAPEUTICS INCITEOS THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 2,738,785 shares 2,738,785$30M14.74%0
HOWLWEREWOLF THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 4,284,172 shares 4,284,172$16.5M8.13%0Timeline
REPARE THERAPEUTICS INCREPARE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 2,242,636 shares 2,242,636$16.4M8.04%0
ADAPYADAPTIMMUNE THERAPEUTICS PLC SQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 5,555,461 shares 5,555,461$4.41M2.16%-731,640Timeline
HARPOON THERAPEUTICS INCHARPOON THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2022Q1: restricted; 2022Q2: restricted; 2022Q3: restricted; 2022Q4: restricted; 2023Q1: restricted; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: 313,136 shares 313,136$3.56M1.75%new

Sold out in Q4 2023

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

SecurityShares beforeValue beforeType
HARPOON THERAPEUTICS INCHARPOON THERAPEUTICS INC313,136$1.26Mshares

How Q4 2023 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 0000950123-24-001862 base2024-02-13acceptance time not in the bulk data set