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Third Rock Ventures III, L.P.

CIK 1569705 · last filed 2023-02-06

Third Rock Ventures III, L.P. is a corporate insider who has filed 6 SEC Form 4 insider transactions across 4 companies since 2016. The most recent filing, for VYGR, was dated Feb 6, 2023. Across all open-market trades the lifetime net is −$354.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.89B across reported positions. The firm reports its address in Boston, MA. 53 SEC filings were submitted jointly with TRV GP III, 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.

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Disclosed Exposure

$1.89B

Companies

4

Total Filings

6

Lifetime Open-Market Net

-$354.13M

Filer Profile

Reported Address
29 NEWBURY STREET, 3RD FLOOR
BOSTON, MA 02116
Phone
(617) 585-2000
State of Incorporation
DE
Related Filers
TRV GP III, LLC — 53 joint filings, latest 2023-02-06
Third Rock Ventures GP III, L.P. — 53 joint filings, latest 2023-02-06
ROBERT I TEPPER — 49 joint filings, latest 2023-02-06
KEVIN P STARR — 36 joint filings, latest 2021-11-16
MARK J LEVIN — 31 joint filings, latest 2021-11-16
TRV GP II, LLC — 9 joint filings, latest 2020-02-18
Third Rock Ventures GP II, L.P. — 9 joint filings, latest 2020-02-18
Third Rock Ventures II, L.P. — 9 joint filings, latest 2020-02-18
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
VYGR 10%+ Owner 86,265 $3.51 $302.8K -$5.65M 3 2023-02-06
FULC 10%+ Owner 2,427,374 $3.85 $9.35M $0 1 2021-11-12
RVMD 10%+ Owner 8,933,348 $210.02 $1.88B $0 1 2020-12-04
Global Blood Therapeutics, Inc. (GBT) Delisted 10%+ Owner 1,285,713 $68.49 $88.06M -$348.48M 1 2016-11-16

Recent Filings

6 filings
Insider 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
2023-02-06 VYGR Other (J) −6,000,000 $0 EDGAR
2023-01-24 VYGR Sell (S) −620,000 -$5.65M EDGAR
2021-11-12 FULC Other (J) −5,000,000 $0 EDGAR
2020-12-04 RVMD Other (J) −6,000,000 $0 EDGAR
2018-09-19 VYGR Other (J) −7,500,000 $0 EDGAR
2016-11-16 Global Blood Therapeutics, Inc. (GBT) Delisted Sell (S) −18,000,000 -$348.48M 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.