MPM BioVentures 2014 LLC
CIK 1765021 · last filed 2025-11-25
MPM BioVentures 2014 LLC is a corporate insider who has filed 11 SEC Form 4 insider transactions across 4 companies since 2019. The most recent filing shows the insider sold $897.8K of HOWL on Nov 25, 2025. Across all open-market trades the lifetime net is −$72.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $5.1M across reported positions. The firm reports its address in Boston, MA. 54 SEC filings were submitted jointly with MPM Asset Management Investors BV2014 LLC.
"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.
$5.07M
4
11
-$72.06M
Filer Profile
SUITE 1100
BOSTON, MA 02116
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| HOWL | 10%+ Owner | 5,257,105 | $0.96 | $5.07M | -$3.60M | 3 | 2025-11-25 |
| iTeos Therapeutics, Inc. (ITOS) Delisted | 10%+ Owner | 2,108,594 | $10.15 | $21.40M | -$86.75M | 3 | 2025-05-15 |
| Harpoon Therapeutics, Inc. (HARP) Delisted | 10%+ Owner | 322,190 | $23.01 | $7.41M | -$11.72M | 4 | 2021-04-15 |
| Repare Therapeutics Inc. (RPTX) Delisted | 10%+ Owner | 1,801,581 | $2.65 | $4.77M | $30.00M | 1 | 2020-06-25 |
Recent Filings
11 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-11-25 | HOWL | Sell (S) | −978,330 | -$897.8K | EDGAR |
| 2025-11-20 | HOWL | Sell (S) | −800,515 | -$739.6K | EDGAR |
| 2025-11-03 | HOWL | Sell (S) | −1,475,215 | -$1.96M | EDGAR |
| 2025-05-15 | iTeos Therapeutics, Inc. (ITOS) Delisted | Sell (S) | −5,671,719 | -$45.71M | EDGAR |
| 2021-12-07 | iTeos Therapeutics, Inc. (ITOS) Delisted | Sell (S) | −448,479 | -$15.13M | EDGAR |
| 2021-12-02 | iTeos Therapeutics, Inc. (ITOS) Delisted | Sell (S) | −751,671 | -$25.91M | EDGAR |
| 2021-04-15 | Harpoon Therapeutics, Inc. (HARP) Delisted | Sell (S) | −37,328 | -$752.6K | EDGAR |
| 2021-04-13 | Harpoon Therapeutics, Inc. (HARP) Delisted | Sell (S) | −102,368 | -$2.37M | EDGAR |
| 2021-02-12 | Harpoon Therapeutics, Inc. (HARP) Delisted | Sell (S) | −1,647,459 | -$32.95M | EDGAR |
| 2020-06-25 | Repare Therapeutics Inc. (RPTX) Delisted | Mixed | +18,022,632 | $30.00M | 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.