MPM BioVentures 2014, L.P.
CIK 1609492 · last filed 2025-12-04
"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
$4.70M
Companies
3
Total Filings
22
Lifetime Open-Market Net
$114.28M
Filer Profile
Reported Address
C/O MPM BIOIMPACT399 BOYLSTON STREET, SUITE 1100
BOSTON, MA 02116
Phone
(617) 425-9200
State of Incorporation
DE
Related Filers
MPM Asset Management Investors BV2014 LLC — 57 joint filings, latest 2026-08-31
MPM BioVentures 2014 (B), L.P. — 57 joint filings, latest 2026-08-31
MPM BioVentures 2014 GP LLC — 54 joint filings, latest 2026-08-31
MPM BioVentures 2014 LLC — 54 joint filings, latest 2026-08-31
Todd Foley — 41 joint filings, latest 2026-08-31
LUKE EVNIN — 38 joint filings, latest 2026-08-31
MPM ASSET MANAGEMENT INVESTORS BV2018 LLC — 26 joint filings, latest 2026-08-31
MPM BIOVENTURES 2018 (B), L.P. — 26 joint filings, latest 2026-08-31
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses.
View filings on SEC EDGAR.
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 | 4,867,341 | $0.96 | $4.70M | -$916.4K | 1 | 2025-12-04 | |
| iTeos Therapeutics, Inc. (ITOS) Delisted | 10%+ Owner | 69,951 | $10.15 | $710.0K | $30.40M | 1 | 2020-07-29 |
| TCR2 THERAPEUTICS INC. (TCRR) Delisted | 10%+ Owner | 3,021,298 | $1.48 | $4.47M | $84.80M | 1 | 2019-02-21 |
Recent Filings · Page 3 of 3
22 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 |
|---|---|---|---|---|---|
| 2020-07-29 | iTeos Therapeutics, Inc. (ITOS) Delisted | Mixed | +37,066,630 | $30.40M | EDGAR |
| 2019-02-21 | TCR2 THERAPEUTICS INC. (TCRR) Delisted | Mixed | +30,839,704 | $84.80M | EDGAR |
Showing 21–22 of 22
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Page 3 of 3
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.