Castle Island Ventures is a venture capital firm exclusively focused on public blockchains, investing in infrastructure and application companies that enable these transformative protocols to reach their full potential. Their strategy primarily targets early-stage (pre-seed and seed) companies within the blockchain and crypto asset space.
33% of their portfolio is in Crypto & Web3. Average disclosed round size is $23.5M (across 20 rounds with reported amounts).
Portfolio
21
Fund Size
$250M
Top Stage
Series A
Last 12 Mo
3
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
21 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Project Eleven | Series A | $20M | Jan 2026 |
 Tesser | Seed | $4.5M | Oct 2025 |
 Bob | Strategic | $8.1M | Aug 2025 |
 Surus | Seed | $8M | Feb 2025 |
 Hata | Seed | $4.2M | Oct 2024 |
 Arch Lending | Seed | $5M | Aug 2024 |
 BOB (Build on Bitcoin) | Unknown | — | Apr 2024 |
 DUST Identity, Inc. | Series B | $40M | Dec 2023 |
 CAT Labs | Pre-Seed | $4.3M | Apr 2023 |
 Andrena | Series A | $15M | Feb 2023 |
 Fordefi | Seed | $18M | Nov 2022 |
| HHalborn | Series A | $90M | Jul 2022 |
 Talos | Series B | $105M | May 2022 |
 TRM Labs | Series B | $60M | Dec 2021 |
 Pintu | Series A | $35M | Aug 2021 |
| Pintu | Series A | $6M | May 2021 |
| RRiver Financial | Series A | $12M | Mar 2021 |
 Flipside Crypto | Seed | $7.1M | Sep 2019 |
| DUST Identity, Inc. | Series A | $10M | Jul 2019 |
| DUST Identity, Inc. | Seed | $2.3M | Nov 2018 |
| FFélix Pago | Series A | $15.5M | — |
Top Co-Investors
Coinbase Ventures3 shared
Pantera3 shared
Digital Currency Group3 shared
Kleiner Perkins3 shared
Lightspeed Venture Partners2 shared
Intudo Ventures2 shared
Citi Ventures2 shared
DRW Venture Capital2 shared
PayPal Ventures2 shared
Initialized Capital2 shared
Airbus Ventures2 shared
Science2 shared
Angular Ventures2 shared
Illuminate Financial2 shared
Fin Capital2 shared
CMT Digital2 shared
Blockchain.com Ventures1 shared
Summit Partners1 shared
Dragonfly1 shared
Afore Capital1 shared
Last updated: 12 April 2026