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Castle Island Ventures logo

Castle Island Ventures

United States$100K – $5M chequesUpdated May 2026
WebsiteLinkedInX / TwitterCrunchbase

Formative-stage investor (writes $250k–$1M checks) geared toward equity-only Bitcoin and public-distributed ledger technology companies, differentiated by ex-Fidelity expertise and research, podcast, and stablecoin reports connecting founders to banks and ETF issuers. Through targeted capital deployment, the fund plays an active role in the startup ecosystem.

Cheque size
$100K – $5M
Stages
Pre-SeedSeries A
Industries
Technology
Operating in
United States
How they invest
Not specified
Technologies
Not specified
In the Nautis docs

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