MPM BioVentures 2014 (B), L.P.
CIK 1609493 · last filed 2025-11-12
MPM BioVentures 2014 (B), L.P. is a corporate insider who has filed 5 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing shows the insider sold $1.2M of HOWL on Nov 12, 2025. Across all open-market trades the lifetime net is −$43.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $30.8M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$30.77M
3
5
-$43.64M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| HOWL | 10%+ Owner | 5,731,860 | $0.38 | $2.18M | -$1.21M | 1 | 2025-11-12 |
| iTeos Therapeutics, Inc. (ITOS) Delisted | 10%+ Owner | 2,771,359 | $10.15 | $28.13M | -$60.44M | 2 | 2022-01-06 |
| TRDA | 10%+ Owner | 4,425,784 | $6.46 | $28.59M | $18.00M | 1 | 2021-11-04 |
Recent Filings
5 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-11-12 | HOWL | Sell (S) | −1,067,645 | -$1.21M | EDGAR |
| 2023-06-05 | — | Other (J) | −33,271,712 | $0 | |
| 2022-01-06 | iTeos Therapeutics, Inc. (ITOS) Delisted | Sell (S) | −1,320,165 | -$56.21M | EDGAR |
| 2021-11-04 | TRDA | Mixed | +39,832,056 | $18.00M | EDGAR |
| 2021-10-18 | iTeos Therapeutics, Inc. (ITOS) Delisted | Sell (S) | −153,891 | -$4.22M | EDGAR |