Active: new deal Jun 2026 Verified 4 Nov 2026
Castle Island Ventures
Venture firm focused exclusively on public blockchains, investing in early-stage companies at the intersection of traditional finance and blockchain networks.
- Type
- VC firm
- Location
- Boston, Massachusetts, United States
- Stages
- Seed
- Backs
- Crypto and web3, B2B software, Fintech
- Sectors
- Crypto, Fintech, AI
- Fund size / AUM
- Fund size not disclosed on Form D
- Latest fund or filing
- 30 Oct 2025
- Portfolio mix
- Crypto and web3 52%; B2B software 24%; Fintech 19%; Hardware 5% (n=21)
- Website
- www.castleisland.vc
Fund filings (SEC Form D)
- Latest fund on file
- Castle Island Ventures IV Feeder
- Filed
- 30 Oct 2025 (new notice)
- Fund size
- Not disclosed on the filing
See this fund's filings on SEC EDGAR
Contacts on file
For Castle Island Ventures, the paid file holds: 8 named decision-makers with roles; firm contact email (domain checked); LinkedIn page.
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Notable investments
ARQBitwiseEreborFelixHidden Road
Sources
- www.sec.gov/Archives/edgar/data/2060985/000147083125000280/
- adviserinfo.sec.gov/firm/summary/298999
- castleisland.vc/
- castleisland.vc/portfolio/
- castleisland.vc/contact/
- www.sec.gov/Archives/edgar/data/2060993/000206099325000002/
Last checked 4 Nov 2026. Is something wrong? Tell us.
Appears in 25 lists
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