/

Investors / United States / Third Rock Ventures / Co-investors

Third Rock Ventures co-investors

Who invests alongside Third Rock Ventures · Venture capital · Boston, MA, United States

Third Rock Ventures shares at least one checked portfolio company with 121 other investors. It backs companies most often with Casdin Capital (7), General Catalyst (4) and Andreessen Horowitz (3), and 88% of its 34 checked companies have another investor VCinfo tracks.

121co-investors
30companies backed with another investorof 34 checked
88%of its portfolio is co-backed
Casdin Capitalmost frequent co-investor7 shared companies

Co-investor network

the 14 firms it shares most with, and the companies they back together
103 shared companies84 shared companies61 shared companies38 shared companies26 shared companies22 shared companies17 shared companies16 shared companies14 shared companies13 shared companies11 shared companies10 shared companies10 shared companies9 shared companies9 shared companies9 shared companies8 shared companies8 shared companies8 shared companies8 shared companies7 shared companies7 shared companies7 shared companies7 shared companiesCasdin Capital: 7 shared companiesCasdin Capital7General Catalyst: 4 shared companiesGeneral Catalyst4ARCH Venture Partners: 3 shared companiesARCH Venture Partners3Andreessen Horowitz: 3 shared companiesAndreessen Horowitz3Foresite Capital: 3 shared companiesForesite Capital3GV: 3 shared companiesGV3RA Capital: 3 shared companiesRA Capital3Astir Ventures: 2 shared companiesAstir Ventures2Boxer Capital: 2 shared companiesBoxer Capital2Frazier Life Sciences: 2 shared companiesFrazier Life Sciences2Molten Ventures: 2 shared companiesMolten Ventures2Omega Funds: 2 shared companiesOmega Funds2Y Combinator: 2 shared companiesY Combinator22150: 1 shared companies21501
Shared portfolio companies with Third Rock VenturesFirms that also back companies together

Circle size is the number of companies shared with Third Rock Ventures; a line joins two co-investors that back at least two companies together.

All co-investors

top 60 of 121, ranked by shared portfolio companies
#InvestorSharedCompanies both back
1Casdin CapitalVenture capital · United States7Compare · Its co-investors
2General CatalystVenture capital · United States4Compare · Its co-investors
3Andreessen HorowitzVenture capital · United States3Compare · Its co-investors
4ARCH Venture PartnersVenture capital · United States3Compare · Its co-investors
5Foresite CapitalVenture capital · United States3Compare · Its co-investors
6GVVenture capital · United States3Compare · Its co-investors
7RA CapitalVenture capital3Compare · Its co-investors
8Astir VenturesMicro VC · United States2Compare · Its co-investors
9Boxer CapitalVenture capital · United States2Compare · Its co-investors
10Frazier Life SciencesVenture capital · United States2Compare · Its co-investors
11Molten VenturesVenture capital · United Kingdom2Compare · Its co-investors
12Omega FundsVenture capital · United States2Compare · Its co-investors
13Y CombinatorAccelerator · United States2Compare · Its co-investors
142150Venture capital · United Kingdom1Compare · Its co-investors
1599 StartupsVenture capital · Mexico1Compare · Its co-investors
16A&E InvestmentsVenture capital1Compare · Its co-investors
17A.Capital VenturesVenture capital · United States1Compare · Its co-investors
18a16z FrontierVenture capital · United States1Compare · Its co-investors
19AENUVenture capital · Germany1Compare · Its co-investors
20Agent CapitalVenture capital · United States1Compare · Its co-investors
21AloniqVenture capital1Compare · Its co-investors
22Alstin CapitalVenture capital · Germany1Compare · Its co-investors
23Altamont Pharmaceutical HoldingsUnited States1Compare · Its co-investors
24Arche CapitalVenture capital1Compare · Its co-investors
25ATEL VenturesUnited States1Compare · Its co-investors
26Azure Capital PartnersVenture capital · United States1Compare · Its co-investors
27B CapitalVenture capital · United States1Compare · Its co-investors
28Balerion Space VenturesVenture capital · United States1Compare · Its co-investors
29BBQ CapitalVenture capital · United States1Compare · Its co-investors
30Bessemer Venture PartnersVenture capital · United States1Compare · Its co-investors
31Biomatics CapitalVenture capital · United States1Compare · Its co-investors
32Bonfire VenturesVenture capital · United States1Compare · Its co-investors
33Calm/Storm VenturesVenture capital1Compare · Its co-investors
34CanaanVenture capital · United States1Compare · Its co-investors
35Capital FactoryVenture capital · United States1Compare · Its co-investors
36Capitoriacapitoria.com1Compare · Its co-investors
37Catalio Capital ManagementVenture capital · United States1Compare · Its co-investors
38Claritas CapitalVenture capital · United States1Compare · Its co-investors
39Clinton Capital PartnersAustralia1Compare · Its co-investors
40CRVVenture capital · United States1Compare · Its co-investors
41Divergence VenturesVenture capital1Compare · Its co-investors
42Draft VenturesVenture capital1Compare · Its co-investors
43ElefundVenture capital · United States1Compare · Its co-investors
44Emergence CapitalVenture capital · United States1Compare · Its co-investors
45Ensemble VCVenture capital · United States1Compare · Its co-investors
46F-Prime CapitalVenture capital · United States1Compare · Its co-investors
47FelicisVenture capital · United States1Compare · Its co-investors
48Fin CapitalVenture capital · United States1Compare · Its co-investors
49First MomentumVenture capital · Germany1Compare · Its co-investors
50First Trust Capital PartnersCorporate VC · United States1Compare · Its co-investors
51Foundation CapitalVenture capital · United States1Compare · Its co-investors
52Founders, Inc.Accelerator · United States1Compare · Its co-investors
53Frontierspace VenturesVenture capital · United States1Compare · Its co-investors
54Fulgur VenturesVenture capital · United States1Compare · Its co-investors
55Future VenturesVenture capital · United States1Compare · Its co-investors
56G2 Venture PartnersVenture capital · United States1Compare · Its co-investors
57General AtlanticVenture capital · United States1Compare · Its co-investors
58Good Growth CapitalVenture capital · United States1Compare · Its co-investors
59Grid110Accelerator · United States1Compare · Its co-investors
60Hack VCVenture capital · United States1Compare · Its co-investors
Showing the top 60 of 121. GET /v1/firms/thirdrockventures.com/coinvestors returns the ranked list as JSON for a CRM, a sheet or an AI agent: 25 firms a call on the free plan, 100 on Pro.
Get free API keyAPI docs

A co-investor is a firm whose own portfolio page lists a company that Third Rock Ventures' page lists too, both checked against the company's site. It shows who backs the same companies, not who joined the same round. How the data is graded

Free account · no card

Get Third Rock Ventures' co-investors as data

Pull this ranked list, Third Rock Ventures' portfolio and any firm's profile through one API key or MCP, compare portfolios side by side, and get an email when Third Rock Ventures adds a company.

Work email, sign-in link by email. Already have an account? Log in
  • Ask AI5 plain-English investor searches a day
  • Full listsEvery portfolio row and two-firm overlap
  • API and MCP100 REST or MCP calls a month, one key
  • AlertsFollow 5 investors for portfolio and fund changes
VCinfo API
$ curl -H "X-API-Key: YOUR_KEY" \
  https://api.vcinfo.io/v1/firms/thirdrockventures.com/coinvestors

# also
GET /v1/firms/thirdrockventures.com
GET /v1/firms/thirdrockventures.com/portfolio
The same data as an MCP server for Claude, Cursor and other AI tools. Set up MCP · Docs · Pricing