Last updated 2026-06-18
Portfolio
2
in our dataset
Rounds participated
2
Rounds led
1
Rounds' value
$26.2M
total disclosed, rounds participated
Stages
—
About
Public blockchain and cryptoasset venture firm located in Cambridge, Massachusetts.
Portfolio · 2
Investment activity
1 portfolio exit on record.
Portfolio by sector
Business Software2
Q&A
- What is Castle Island Ventures' investment focus?
- Castle Island Ventures is a public blockchain and cryptoasset venture firm.
- Which companies are notable in Castle Island Ventures' portfolio?
- Castle Island Ventures' portfolio includes Fordefi, an institutional MPC wallet and security platform, and SendBlocks, a blockchain data-management platform.
- Has Castle Island Ventures had any recent exits?
- Yes, Fordefi, a portfolio company of Castle Island Ventures, was acquired by Paxos in November 2025 for $100M.
- What is the typical investment stage for Castle Island Ventures?
- Castle Island Ventures primarily invests in Seed stage companies, with two such rounds recorded.
- What sectors does Castle Island Ventures concentrate on for investments?
- Castle Island Ventures shows a concentration in the Business Software sector, with all two of its recorded investment rounds and both of its portfolio companies falling into this category.
- What was Castle Island Ventures' most recent investment?
- Castle Island Ventures participated in a Seed round for SendBlocks in July 2024, which raised $8.2M.
- What was the investment amount for Fordefi?
- Castle Island Ventures invested in Fordefi, which raised $18M in a funding round.