United States · 
What does Castle Island Ventures invest in?
Castle Island Ventures invests most often at Seed and Venture (68% of the rounds on record), in sectors such as Public Blockchains, Blockchain Infrastructure and Blockchain Applications.
Castle Island Ventures highlights
- 01
16 cheques in the last 12 months
- 02
Mostly Seed and Venture: 68% of its rounds
- 03
Sole investor in 3 rounds, median $4.0M
What they do
We are a venture capital firm focused exclusively on public blockchains.From their own website
- Type
- VC firm (from a list, unverified)
- Cheque size
- $100K – $10M as they say
- Stages
- Pre-seedSeedSeries ASeries B
- Sectors
- Public BlockchainsBlockchain InfrastructureBlockchain Applications
- Based in
- Boston, United States
- Cold pitches
- Not accepted
The record
Every round we can evidence, newest first79 appearances
- 2026
13 rounds
- Oct
- Sept
- Sept
- Sept
- Sept
- Aug
- Jul
- Jul
- May
- Mar
- Mar
- Feb
- Jan
- 2025
22 rounds
- Dec
- Nov
- Nov
- Oct
- Oct
- Oct
- Sept
- Aug
- Aug
- Jul
- Jun
- Jun
- May
- May
- Apr
- Apr
- Apr
- Mar
- Feb
- Feb
- Jan
- Jan
- 2024
15 rounds
- Dec
- Dec
- Oct
- Oct
- Oct
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
The team
Named by the firm itself, on a filing, its Form ADV or its company registration4 named
GMGretchen Marie MccareyChief Financial OfficeriForm ADV
MPMatthew P WalshManaging MemberiFiling they signed
NENicolas Elliott CarterManaging MemberiFiling they signed
SMSean Michael JudgeManaging MemberiForm ADV
We also hold 10 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
What the register says
From the firm's own filings with the SEC, which it must file accurately by law
$790Mgross assets of its fundsOct 2026
Exemptreporting adviserventure or small private funds
- Legal name
- Castle Island Management, LLC
- SEC number
- CRD 298999
What they claim to have backed
From their own portfolio page (on their website)
10 of 12 we have independently watched raise
ArqfinanceEreborFelixpagoGromaProjectelevenRippleStation70TrmlabsXfxYellowcardBitwiseinvestmentsTalos
Weaker than a round we watched, stronger than a list somebody sold us. A firm is far less willing to put a company on its own site that it never funded.