MPM Asset Management LLC: 13F holdings, Q3 2025
Hedge fund · SEC EDGAR filings (CIK 1263048) · Explore on the interactive board
MPM Asset Management LLC disclosed 4 US equity positions worth $44.5m in its Q3 2025 13F filing (holdings as of September 30, 2025, filed November 14, 2025). Its largest position is TRDA at 57.1% of the reported book, followed by DYN, HOWL. The top ten holdings are 100.0% of the book, and the portfolio behaves like about 2 equal-weight positions. Versus the prior filing it opened 0 new positions, added to 0, reduced 0 and exited 1. Note: this manager's most recent filing is 3 quarters behind the newest quarter on file, so these figures are history rather than current positioning.
What does MPM Asset Management LLC own? Top holdings as of September 30, 2025
Change is measured in shares against the previous filing (Q2 2025), so price moves do not read as decisions. This quarter: 0 new, 0 added, 0 reduced, 1 exited.
| # | Stock | Sector | Weight | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|---|
| 1 | TRDA Entrada Therapeutics, Inc. | 57.1% | $25.4m | 4,381,062 | 0% | held | |
| 2 | DYN Dyne Therapeutics, Inc. | Healthcare | 19.4% | $8.6m | 682,376 | 0% | held |
| 3 | HOWL Werewolf Therapeutics, Inc. | 19.1% | $8.5m | 4,309,860 | 0% | held | |
| 4 | RPTX Repare Therapeutics, Inc. | 4.4% | $2.0m | 1,121,318 | 0% | held |
What did MPM Asset Management LLC sell? Positions exited since the previous filing
| Stock | Prior weight | Prior value |
|---|---|---|
| ADAPY Adaptimmune Therapeutics plc | 100.0% | $1.2m |
Sector mix
| Sector | Weight |
|---|---|
| Healthcare | 19.4% |
Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.
Filing history
How concentrated is MPM Asset Management LLC's portfolio?
Across every quarter MPM Asset Management LLC has filed, its median largest position is 57.1% of the book and its median top-ten weight is 100.0%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 2.0 completed holding spells, the median lasted 3.5 quarters; 4.0 positions are still open and their final length is unknown.