Castle Island Ventures
Castle Island Ventures is a venture capital firm based in Cambridge, United States. This profile covers what Castle Island Ventures invests in, its typical stage and check size, and how founders can get in front of it in 2026.
Castle Island Ventures is a venture capital firm,
- Investment focus
- Crypto & Web3FintechPaymentsCybersecurityDeveloper Tools & Data
- Location
- Cambridge, United States
- Founded
- 2018
- Team size
- 1-10
- Investments
- 76
- Typical round
- $5.3M
How to pitch Castle Island Ventures
The founders who hear back from Castle Island Ventures lead with traction and a clear ask that matches its stage, not a generic mass email. Build a targeted, verified list, write a personalized note, and track who opens it, all in one place.
Connect with Castle Island Ventures
About this profile
This profile is part of Round Funded, an investor database and outreach platform for founders. It covers 60,000+ active VCs, angels, family offices and accelerators with verified contacts, lets you send pitches from your own Gmail, and includes a free Data Room for your raise. How this data is built.
Cite this page
Round Funded. "Castle Island Ventures." Round Funded investor database, updated October 19, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/vc/castle-island-ventures
Frequently Asked Questions
What does Castle Island Ventures invest in?
Castle Island Ventures focuses on Crypto & Web3, Fintech, Payments and Cybersecurity. Match your sector and stage before reaching out, then find similar active investors on Round Funded.
What is Castle Island Ventures's typical check size?
Castle Island Ventures's typical round is around $5.3M. Use it as a signal for whether your raise fits its stage.
Is Castle Island Ventures actively investing?
Yes, Castle Island Ventures is an active a venture capital firm. Reach out with a personalized pitch that fits its stage and focus, then track who opens it.
Where is Castle Island Ventures based?
Castle Island Ventures is based in Cambridge, United States. You can reach out from anywhere with a pitch that matches its focus.
How do I contact Castle Island Ventures?
Unlock Castle Island Ventures's verified email and reach out with a personalized pitch on Round Funded. We show only deliverable contacts, so your outreach does not bounce.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.