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 24 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing, for HOWL, was dated Jul 6, 2026. 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 $32.9M 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.
$32.95M
3
24
-$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 | $2.19M | -$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 | $6.95 | $30.76M | $18.00M | 1 | 2021-11-04 |
Recent Filings
24 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-06 | HOWL | Notice (144) | −6,459 | -$2.2K | EDGAR |
| 2026-06-29 | HOWL | Notice (144) | −7,087 | -$2.3K | EDGAR |
| 2026-05-28 | HOWL | Notice (144) | −16,287 | -$8.0K | EDGAR |
| 2026-05-18 | HOWL | Notice (144) | −19,370 | -$10.0K | EDGAR |
| 2026-05-11 | HOWL | Notice (144) | −5,635 | -$3.8K | EDGAR |
| 2026-05-01 | HOWL | Notice (144) | −24,251 | -$17.5K | EDGAR |
| 2026-04-29 | HOWL | Notice (144) | −8,678 | -$6.4K | EDGAR |
| 2026-04-27 | HOWL | Notice (144) | −8,678 | -$7.1K | EDGAR |
| 2026-01-06 | HOWL | Notice (144) | −13,256 | -$8.5K | EDGAR |
| 2025-12-29 | HOWL | Notice (144) | −8,679 | -$5.7K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.