Castle Island Ventures
Castle Island Ventures is a Seed venture capital firm based in Boston, MA investing in Fintech, Other. The firm typically writes $1.0M–$5.0M checks and has 69 portfolio companies in our records.
- Check size
- $1.0M–$5.0M
- Portfolio
- 69 companies on record
- Partners
- 3 listed
- AUM
- $330M
- Stage
- Seed
- Sectors
- Fintech, Other
- HQ
- Boston, MA
Last verified: 2026-05-24
Seed
$1.0M – $5.0M
$330M
69+ companies
3 partners
Investment Thesis
Focused exclusively on companies leveraging blockchain technology to transform financial services and capital markets infrastructure.
How Castle Island Ventures invests
Castle Island Ventures is a vc firm based in Boston, MA. The firm invests at the Seed stage, with a focus on Fintech, Other.
Castle Island Ventures typically writes checks of $1.0M–$5.0M per investment, backed by approximately $330M in assets under management.
Castle Island Ventures has backed 69 companies in our records, including Coin Metrics, BlockFi, Alkimiya.
Partners & Team
Industry Focus
Invests In
Portfolio Companies (69)
Other
Coin Metrics
BlockFi
Alkimiya
Alpen Labs
Andrena
Arcade
Arch
ARQ
Asymmetry Finance
Atrium
- •Raising at Seed? You're squarely in their sweet spot.
- •Lead with your fit in Fintech, Other — the sectors they actively back.
- •Size your ask to their typical $1.0M – $5.0M check.
- •warm intro preferred
- •Address your outreach to a specific partner, such as Laura Lentz, Executive Assistant.
- •A warm introduction beats a cold email. Get matched and request an intro.
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