# Matt Walsh

> Matt Walsh is a seed investor at Castle Island Ventures (Boston) backing Blockchain and Software. See 16 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Castle Island Ventures](https://shizune.co/investors/profile/castle-island-ventures)
- Location: Boston, United States
- Total investments: 16
- Last investment: Jul 2026
- Lead investor: 38%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/matthewpwalsh/
- X (Twitter): https://twitter.com/mattwalshinbos
- Website: https://x.com/mattwalshinbos

Matt Walsh is a seed investor at Castle Island Ventures in Boston focused on Blockchain and Software. Matt Walsh is the Founding Partner of Castle Island Ventures. He attended Duke University - The Fuqua School of Business.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Blockchain | 5 | 31% |
| Software | 3 | 19% |
| Cryptocurrency | 3 | 19% |
| FinTech | 2 | 13% |
| Analytics | 2 | 13% |

29 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 4 | 25% |
| Pre-Seed | 3 | 19% |
| Series A | 3 | 19% |
| Series B | 2 | 13% |
| Series C | 2 | 13% |

6 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 7 | 44% |
| Canada | 1 | 6% |
| France | 1 | 6% |
| Malaysia | 1 | 6% |

## 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 |  |
| Hata | Hata is a regulated platform where businesses & consumers can transact and access cryptocurrencies with fiat currency such as the US Dollar & Malaysia Ringgit. Our vision is to enable safe & effortless access to cryptocurrency for all. We're committed to achieve that by providing a reliable platform for all to accesscryptocurrency easily, through our commitment to customers and compliance with regulations. Hata is regulated by the Securities Commission of Malaysia as a Recognised Market Operator (Digital Asset Exchange & Digital Broker) , and the Labuan Financial Services Authority (Malaysia) as a Licensed Money Broker & Payment System Operator. Learn more at : https://hata.io | $4.2M | Seed | Oct 21, 2024 |  |
| Station70 | Station70 provides scalable and resilient disaster recovery solutions. | $5M | Seed | Apr 01, 2024 |  |
| Groma | Groma is a vertically integrated real estate investment, development and management company combined with a tech startup building tools to provide better outcomes for our investors, tenants and the communities we serve. | $20M | Series A | Jan 30, 2023 |  |
| Halborn | Halborn is a cybersecurity company protecting blockchain organizations from cyber attacks. It serves as a third-party partner to continuously assess an organization's most vital assets, drive maximum automation and provide world-class cybersecurity consulting and execution every step of the way - far beyond smart contracts. | $90M | Series A | Jul 19, 2022 |  |
| Ellis | Ellis is a high-tech, high-touch immigration law firm offering premier immigration support for startups and growing companies. We ensure your international hires arrive on-time, stay compliant, and feel valued from Day 1. | $5.6M | Seed | Apr 14, 2022 |  |
| Coin Metrics | Coin Metrics is the provider of crypto financial intelligence, providing network data, market data, indexes, and network risk solutions to the most prestigious institutions touching crypto-assets. Coin Metrics is an open-source project to determine the economic significance of public blockchains. Today, we expand on that original purpose to empowerpeople and institutions to make informed crypto-financial decisions. | $35M | Series C | Apr 06, 2022 |  |
| Ellis | Ellis is a high-tech, high-touch immigration law firm offering premier immigration support for startups and growing companies. We ensure your international hires arrive on-time, stay compliant, and feel valued from Day 1. | $1.1M | Pre-Seed | Aug 02, 2021 |  |
| Coin Metrics | Coin Metrics is the provider of crypto financial intelligence, providing network data, market data, indexes, and network risk solutions to the most prestigious institutions touching crypto-assets. Coin Metrics is an open-source project to determine the economic significance of public blockchains. Today, we expand on that original purpose to empowerpeople and institutions to make informed crypto-financial decisions. | $15M | Series B | May 05, 2021 |  |
| Mash | Mash is the knowledge agent platform that helps complex & multi-product revenue teams get the information they need, when & where they need it – take the next actions from creating a feature request to escalating an issue to the internal expert – without even asking. Designed for technical & complex products, Mash’s platform automatesanswers, getting contextually relevant information, and managing complex organization workflows. They are the foundation for bringing client, technical, product and tribal knowledge to the entire organization. |  | Pre-Seed | Apr 03, 2021 |  |

10 of 16 investments shown.

## Co-investors
- [Highland Capital Partners](https://shizune.co/investors/profile/highland-capital-partners) — VC Fund, 6 deals together
- [Avon Ventures](https://shizune.co/investors/profile/avon-ventures) — VC Fund, 5 deals together
- [Goldman Sachs](https://shizune.co/investors/profile/goldman-sachs) — VC Fund, 4 deals together
- [Cadenza Ventures](https://shizune.co/investors/profile/cadenza-capital-management) — VC Fund, 3 deals together
- [Communitas Capital Partners](https://shizune.co/investors/profile/communitas-asset-management) — VC Fund, 3 deals together
- [Communitas Capital Partners](https://shizune.co/investors/profile/communitas-capital-partners) — VC Fund, 3 deals together

## About Castle Island Ventures

VC Fund · Cambridge, United States

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.

5 contacts available at Castle Island Ventures.

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

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does Matt Walsh invest in?

Matt Walsh invests primarily in Blockchain, Software and Cryptocurrency startups, most often at Seed and Pre-Seed stage. Most of the 16 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Matt Walsh last invest?

The most recent investment recorded for Matt Walsh closed in Jul 2026. Shizune tracks 16 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### 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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