MPM ASSET MANAGEMENT LLC
Registered adviserRegulatory profile
From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.
| Rosters | Regulatory AUM | Main clients |
|---|---|---|
| May 2026 to Nov 2026 | $3,558,119,290 | Pooled investment vehicles (100%) |
| Apr 2026 | $3,419,319,257 | Pooled investment vehicles (100%) |
| Apr 2025 to Mar 2026 | $3,391,099,110 | Pooled investment vehicles (100%) |
| Apr 2024 to Mar 2025 | $3,348,681,232 | Pooled investment vehicles (100%) |
| May 2023 to Mar 2024 | $3,360,521,440 | Pooled investment vehicles (100%) |
| Apr 2023 | $3,360,521,440 | Pooled investment vehicles (100%) |
Portfolio style
Measured from the filed 13F common-share book for Sep 30, 2025, never from the firm's own description.
Closest benchmark: the Russell 2000 as of 2025-09-30, active share 99.9%; sector active share 86.8% against the combined 13F book's sector weights.
Over time 23 measured quarters
How the bands are measured
Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio Concentration
4 tracked positions · as of Sep 30, 2025 · Δ vs Jun 30, 2025Portfolio Trend
Sector Breakdown
As of Sep 30, 2025| Sector | % Portfolio | Value |
|---|---|---|
| Healthcare | 95.6% | $42,532,639 |
| Unclassified | 4.4% | $1,973,520 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increasedTrimmed
Positions the filer reducedNew Positions
Positions the filer opened this quarterSold Out
Positions the filer fully exited| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| ADAPY | Adaptimmune Therapeutics PLC | 4,809,677 | $1,154,322 | |
| No positions match the current search. | ||||
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| TRDA |
Entrada Therapeutics, Inc.
Healthcare
|
Held | 4,381,062 | $25,410,159 | 57.09% | |
| DYN |
Dyne Therapeutics, Inc.
Healthcare
|
Held | 682,376 | $8,632,056 | 19.40% | |
| HOWL |
Werewolf Therapeutics, Inc.
Healthcare
|
Held | 4,309,860 | $8,490,424 | 19.08% | |
|
|
Held | 1,121,318 | $1,973,520 | 4.43% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.