MPM BioVentures 2014 (B), L.P.
CIK 1609493 · last filed 2025-11-12
"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.
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Disclosed Exposure
$32.95M
Companies
3
Total Filings
24
Lifetime Open-Market Net
-$43.64M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| 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 · Page 2 of 3
24 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-12-22 | HOWL | Notice (144) | −8,679 | -$6.0K | EDGAR |
| 2025-12-10 | HOWL | Notice (144) | −5,912 | -$6.0K | EDGAR |
| 2025-12-03 | HOWL | Notice (144) | −8,679 | -$7.5K | EDGAR |
| 2025-11-24 | HOWL | Notice (144) | −8,679 | -$7.6K | EDGAR |
| 2025-11-17 | HOWL | Notice (144) | −8,679 | -$8.0K | EDGAR |
| 2025-11-12 | HOWL | Sell (S) | −1,067,645 | -$1.21M | EDGAR |
| 2025-11-10 | HOWL | Notice (144) | −8,679 | -$10.0K | EDGAR |
| 2025-11-04 | HOWL | Notice (144) | −8,679 | -$11.4K | EDGAR |
| 2025-10-30 | HOWL | Notice (144) | −8,679 | -$13.5K | EDGAR |
| 2025-10-27 | HOWL | Notice (144) | −8,679 | -$15.4K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.
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.