Updated: June 13, 2026
Castle Island Ventures logo
Investment Fund
Venture Capital Firm
Web3
Crypto

Castle Island Ventures

Founded 2018 · Cambridge, UK

We are a venture capital firm focused exclusively on public blockchains.

Total investments

61

Successful exits

2

About the program

Investment focus areas
Description

Early-stage investor (writes $250k–$1M checks) focused on equity-only Bitcoin and public-blockchain companies, differentiated by ex-Fidelity expertise and research, podcast, and stablecoin reports connecting founders to banks and ETF issuers.

Founded2018

Location

Investment offer

Check size$100 – $10,000,000
Can lead rounds
Yes
Lead preference
Sometimes
Details

Avg Check: $100K - $5M ·

Funding requirements

We invest in various sectors.

Numbers

Total Investments
61
Total Exits
2