# Castle Island Ventures

> Castle Island Ventures is a VC fund backing Blockchain and Cryptocurrency. See 139 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: Cambridge, United States
- Total investments: 139
- Last investment: Jul 2026
- Lead investor: 35%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/castle-island-ventures
- X (Twitter): https://twitter.com/CastleIslandVC
- Website: http://www.castleisland.vc/

Castle Island Ventures is a VC fund in Cambridge focused on Blockchain and Cryptocurrency. They are a venture capital firm focused exclusively on public blockchains. They invest in infrastructure and application companies that will enable these transformative protocols to power services for the next billion users.

## Contacts

5 contacts available for Castle Island Ventures. Shizune tracks 5 team members at Castle Island Ventures. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/castle-island-ventures?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.9M–$11M |
| Pre-Seed | $125k–$8M |
| Series A | $6M–$50M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Blockchain | 41 | 29% |
| Cryptocurrency | 35 | 25% |
| FinTech | 21 | 15% |
| Financial Services | 20 | 14% |
| Software | 15 | 11% |

102 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 59 | 42% |
| Series A | 25 | 18% |
| Pre-Seed | 10 | 7% |
| Series B | 9 | 6% |
| Venture - Series Unknown | 7 | 5% |

8 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 60 | 43% |
| India | 2 | 1% |
| China | 1 | 1% |
| Canada | 1 | 1% |
| France | 1 | 1% |

13 countries tracked in total.

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Ria Bhutoria | General Partner | 2 | https://shizune.co/investors/profile/ria-bhutoria |
| Hunter Merghart | Venture Partner | 0 | https://shizune.co/investors/profile/hunter-merghart |
| Matt Walsh | Founding Partner | 16 | https://shizune.co/investors/profile/matt-walsh-5103 |
| Nic Carter | Founding Partner | 32 | https://shizune.co/investors/profile/nic-carter |
| Sean Judge | General Partner | 10 | https://shizune.co/investors/profile/sean-judge-2 |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Birdai Labs | Birdai Labs provides software and data services for measuring execution quality in onchain markets. Its infrastructure reconstructs transaction flows from public blockchain data and analyzes the gap between an order and its fill, including fees, price impact, and ordering effects. The company offers trade-level execution scoring, value attribution,historical analytics, and REST API access for traders, market makers, protocols, decentralized exchanges, and validators. Birdai Labs also publishes research and a regulatory intelligence feed covering digital-asset market structure and related rules. | $4M | Seed | Jul 28, 2026 |  |
| Cyclops.io | Cyclops.io is a team of serial entrepreneurs with backgrounds from Cisco, Nuance, Bessemer Venture Partners, MIT, Caltech and Harvard. They have an extensive background in online video and collaboration, machine vision and deep learning. Their mission is to replicate the feeling and collaborative richness of being in the same room. It could be usedinternally by distributed teams or by sales or customer service with customers or partners. Everything should be as simple as a click. They are constantly looking for ways to improve your experience. Stay tuned for new and exciting features. | $20M | Series A | Jul 15, 2026 |  |
| XFX | XFX makes global money movement fast, transparent, and capital-efficient across fiat and stablecoin rails. | $17M | Series A | Mar 26, 2026 |  |
| Cyclops.io | Cyclops.io is a team of serial entrepreneurs with backgrounds from Cisco, Nuance, Bessemer Venture Partners, MIT, Caltech and Harvard. They have an extensive background in online video and collaboration, machine vision and deep learning. Their mission is to replicate the feeling and collaborative richness of being in the same room. It could be usedinternally by distributed teams or by sales or customer service with customers or partners. Everything should be as simple as a click. They are constantly looking for ways to improve your experience. Stay tuned for new and exciting features. | $8M | Seed | Mar 04, 2026 |  |
| Valinor | Valinor is a digital investment firm that offers flexible financial capital for fintech companies. | $25M | Seed | Feb 05, 2026 |  |
| Project Eleven | Project Eleven is a development company dedicated to advancing post-quantum cryptography solutions. | $20M | Series A | Jan 14, 2026 |  |
| ARX | ARX smart contracts and HaLo chips enable creators build decentralized, immutable and composable physical crypto assets. | $6.1M | Seed | Nov 06, 2025 |  |
| Atrium | Atrium is an AI-powered intelligence platform built for investors, analysts, and bankers who need to move fast. | $4M | Seed | Oct 22, 2025 |  |
| Tesser | Tesser is a low-code blockchain payment solution platform that provides stability coin payments. | $4.5M | Seed | Oct 21, 2025 |  |
| RockSolid Network | RockSolid Network is a DeFi protocol offering institutional-grade liquid vaults and white-label vault solutions. | $2.8M | Pre-Seed | Sep 09, 2025 |  |

10 of 139 investments shown.

## Co-investors
- [Coinbase Ventures](https://shizune.co/investors/profile/coinbase-ventures) — VC Fund, 20 deals together
- [CMT Digital](https://shizune.co/investors/profile/cmt-digital-ventures-llc) — VC Fund, 13 deals together
- [Avon Ventures](https://shizune.co/investors/profile/avon-ventures) — VC Fund, 11 deals together
- [Cadenza Ventures](https://shizune.co/investors/profile/cadenza-capital-management) — VC Fund, 10 deals together
- [Polychain](https://shizune.co/investors/profile/polychain-capital) — VC Fund, 10 deals together
- [Notation Capital](https://shizune.co/investors/profile/notation-capital-2) — VC Fund, 9 deals together

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## FAQ

### What does Castle Island Ventures invest in?

Castle Island Ventures invests primarily in Blockchain, Cryptocurrency and FinTech startups, most often at Seed and Series A stage. Most of the 139 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Castle Island Ventures's check size?

Castle Island Ventures typically joins rounds of $1.9M–$11M at Seed, $125k–$8M at Pre-Seed and $6M–$50M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Castle Island Ventures participates in.

### How do I contact Castle Island Ventures?

Public channels for Castle Island Ventures include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### Who are the partners at Castle Island Ventures?

The team at Castle Island Ventures includes Ria Bhutoria (General Partner), Hunter Merghart (Venture Partner) and Matt Walsh (Founding Partner). The Team section lists each member with their title, investment count and links.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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