Castle Island Ventures key facts
- Castle Island Ventures is a other based in Boston, Massachusetts with 51 tracked portfolio companies.
- Notable positions include Crusoe, MoonPay, Erebor Bank.
- PrivateMarketView records 1 deal participation by Castle Island Ventures.
- Castle Island Ventures’s most recent recorded investment was in Feb 2026, one of 1 in the last 12 months.
- Castle Island Ventures has 8 funds on record.
- The team roster lists 6 people.
About Castle Island Ventures
Castle Island Ventures is a direct investment firm based in Cambridge, Massachusetts. Established in 2018, the firm is focused exclusively on public blockchains. It invests in infrastructure and application companies that will enable transformative protocols to power services for future users. The assets of the firm are managed by the executive management team.
Investment activity
Castle Island Ventures joined 1 recorded round in the last two years. Most recently: Erebor Bank (seed round, Feb 2026).
Castle Island Ventures portfolio at a glance
51 portfolio companies are on record for Castle Island Ventures, including Crusoe, MoonPay and Erebor Bank.
27 of the 51 carry a recorded valuation and 2 have recorded secondary-market trades, the names a secondary buyer or seller can price.
Castle Island Ventures funds
8 funds are on record for Castle Island Ventures. The most recent is Castle Island Ventures IV Feeder, L.P. (2025 vintage).
Castle Island Ventures team
6 people are on record at Castle Island Ventures: 5 partners and 1 other. Senior names include Henry Harris (Investor), Matthew Walsh (Founding Partner) and Nic Carter (Co-Founder). 3 of them have a verified direct contact on file.
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- ·The top 10 names in the book — of 51 recorded positions
- ·Watchlist + alerts for Castle Island Ventures's activity
Portfolio
51 companies · priced for members| Company | Industry | Valuation | First invested | Role |
|---|---|---|---|---|
| Crusoe | Systems and Information Management | ▮ | ▮ | ▮ |
| MoonPay | Other Financial Services | ▮ | ▮ | ▮ |
| Erebor Bank | — | ▮ | ▮ | ▮ |
+ 48 more companies · all 51, priced and dated or a free account shows the top 10 names — no card Membership and data by Private Market View | ||||
Castle Island Ventures recent deals
1 recordedMembership and data by Private Market View
Funds
6 of 8 recorded- Castle Island Ventures IV Feeder, L.P.2025—
- Castle Island Ventures IV, L.P.2025—
- Castle Island Ventures III-A, L.P.2022—
- Castle Island Ventures III, L.P.2022—
- Castle Island Ventures II-A, L.P.2020—
- Castle Island Ventures II, L.P.2020—
Partners, principals, and the people who answer a pitch. Pro members reveal contacts with credits.
Frequently asked about Castle Island Ventures
- What companies does Castle Island Ventures invest in?
- Castle Island Ventures has 51 recorded portfolio companies, including Crusoe, MoonPay, Erebor Bank.
- What is Castle Island Ventures's AUM?
- Castle Island Ventures manages approximately $22 in assets.
- Is Castle Island Ventures actively investing?
- Castle Island Ventures's most recent recorded investment was in Feb 2026, with 1 investments in the last 12 months.