Co-investors · VC firm · United States

Who invests with Castle Island Ventures

37 investors have backed two or more of the 55 startups Castle Island Ventures has backed in rounds we track. Grouped by kind, each ranked by how many of these startups it shares; Founders Fund shares the most, 4.

37co-investors
2kinds
Founders Fundmost shared (4)
VC firmsmost common kind

Castle Island Ventures's whole portfolioCastle Island Ventures's profile

VC firms

34

+10 more

Private equity and asset managers

3

Segment by segment

VC firms

34 investors

  1. Founders FundVC firmUnited States4 backed
  2. ArcaVC firmUnited States4 backed
  3. Andreessen HorowitzVC firmUnited States4 backed
  4. ArchetypeVC firmUnited States4 backed
  5. PolychainVC firmUnited States4 backed
  6. CMT DigitalVC firmUnited States4 backed
  7. ParaFi CapitalVC firmUnited States4 backed
  8. Craft VenturesVC firmUnited States3 backed

Private equity and asset managers

3 investors

  1. Franklin TempletonPrivate equityUnited States2 backed
  2. GaingelsPrivate equityUnited States2 backed
  3. ApolloPrivate equityUnited States2 backed

How this map is made. Every investor here has backed two or more of the same startups as Castle Island Ventures, in rounds we track. Grouped by kind, each ranked by how many startups it shares with Castle Island Ventures. Rebuilt nightly; updated 15 November 2026.

More portfolio maps

All portfolios
Portfolio mapCastle Island Ventures portfolio map46 startups · $1.9BSector portfolioCastle Island Ventures' Web3 & Crypto portfolio26 startups · $450MCo-investorsWho invests with Techstars991 co-investorsCo-investorsWho invests with SV Angel988 co-investorsCo-investorsWho invests with Andreessen Horowitz977 co-investorsCo-investorsWho invests with Alumni Ventures911 co-investors

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