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THIRD ROCK VENTURES LP

CIK 1408591 · last filed 2018-07-24

THIRD ROCK VENTURES LP is a corporate insider who has filed 5 SEC Form 4 insider transactions across 4 companies since 2013. The most recent filing, for CNST, was dated Jul 24, 2018. Across all open-market trades the lifetime net is −$576.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $103.2M across reported positions. The firm reports its address in Boston, MA. 40 SEC filings were submitted jointly with TRV GP, 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

$103.16M

Companies

4

Total Filings

5

Lifetime Open-Market Net

-$576.44M

Filer Profile

Reported Address
29 NEWBURY STREET
SUITE 401
BOSTON, MA 02116
Phone
(617) 859-3099
State of Incorporation
DE
Related Filers
TRV GP, LLC — 40 joint filings, latest 2018-09-04
Third Rock Ventures GP, L.P. — 40 joint filings, latest 2018-09-04
MARK J LEVIN — 21 joint filings, latest 2018-09-04
ROBERT I TEPPER — 18 joint filings, latest 2018-09-04
KEVIN P STARR — 16 joint filings, latest 2018-09-04
bluebird bio, Inc. — 10 joint filings, latest 2015-02-13
Third Rock Ventures GP III, L.P. — same reported address
Third Rock Ventures II, L.P. — same reported address
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
CONSTELLATION PHARMACEUTICALS INC (CNST) Delisted 10%+ Owner 2,983,051 $33.99 $101.39M $20.00M 1 2018-07-24
Foundation Medicine, Inc. (FMI) Delisted 10%+ Owner 950,956 — — -$596.44M 1 2015-04-09
bluebird bio, Inc. (BLUE) Delisted 10%+ Owner 15,043 $4.97 $74.8K $0 2 2015-02-04
AGIO 10%+ Owner 3,070,090 $33.60 $103.16M $0 1 2014-09-12

Recent Filings

5 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
2018-07-24 CONSTELLATION PHARMACEUTICALS INC (CNST) Delisted Mixed +14,860,005 $20.00M EDGAR
2015-04-09 Foundation Medicine, Inc. (FMI) Delisted Sell (S) −11,928,834 -$596.44M EDGAR
2015-02-04 bluebird bio, Inc. (BLUE) Delisted Other (J) −3,645,162 $0 EDGAR
2014-09-12 AGIO Other (J) −2,475,000 $0 EDGAR
2013-12-18 bluebird bio, Inc. (BLUE) Delisted Other (J) −4,260,822 $0 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.