Sean Judge
General Partner @ Castle Island Ventures
Boston, United States
Sean Judge is a General Partner at Castle Island Ventures and was a Principal at Highland Capital Partners. He attended Vanderbilt University and The London School of Economics and Political Science (LSE).
- Total investments:
- 11
- Last investment:
- Lead investor:
- 55%
Last updated:
For AI agents: llms.txt
Industries Sean Judge invests in
Stages Sean Judge invests in
Countries Sean Judge invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Blockchain 6 (55%)
- Cryptocurrency 4 (36%)
- Software 3 (27%)
- Web3 1 (9%)
- FinTech 1 (9%)
Stage
- Seed 7 (64%)
- Pre-Seed 1 (9%)
- Series A 1 (9%)
- Series B 1 (9%)
- Series C 1 (9%)
Country
- United States 4 (36%)
- India 1 (9%)
- Israel 1 (9%)
- Malaysia 1 (9%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| 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 | ||
| 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 | ||
| SendBlocks helps you cut the time to market from months to weeks and save up to 80% on development efforts. | $8.2M / Seed / Jul 02, 2024 | ||
| PYOR has extensive expertise building in crypto and has played major roles in the creation of several large Indian unicorns, as well as extensive experience in global blue chip organisations. | $4M / Seed / May 18, 2023 | ||
| Fordefi is a technology company that specializes in providing decentralized finance (DeFi) solutions and services. The platform aims to empower users by offering innovative financial products and tools that leverage blockchain technology, enabling secure and transparent transactions.Fordefi focuses on creating an accessible ecosystem for users toengage in various financial activities, such as lending, borrowing, and trading cryptocurrencies. The platform is designed to provide users with greater control over their financial assets, eliminating the need for traditional intermediaries.In addition to its core DeFi offerings, Fordefi emphasizes user education and community engagement, helping users understand the benefits and risks associated with decentralized finance. By fostering a supportive environment, the company aims to promote the adoption of DeFi solutions. | $18M / Seed / Nov 08, 2022 | ||
| Try Your Best is a blockchain technology company. | $9.8M / Seed / Jun 02, 2022 | ||
| 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 | ||
| Try Your Best is a blockchain technology company. | $2M / Pre-Seed / Mar 10, 2022 | ||
| 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 | ||
| 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. | $6M / Series A / Mar 26, 2020 | ||
| See all 11 investments → | |||
Co-Investors
About Castle Island Ventures
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.
Castle Island Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Ria Bhutoria
General Partner
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Hunter Merghart
Venture Partner
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Matt Walsh
Founding Partner
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Nic Carter
Founding Partner
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Sean Judge
General Partner
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FAQ
What does Sean Judge invest in?
Sean Judge invests primarily in Blockchain, Cryptocurrency and Software startups, most often at Seed and Pre-Seed stage. Most of the 11 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Sean Judge?
Public channels for Sean Judge include LinkedIn. 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.
When did Sean Judge last invest?
The most recent investment recorded for Sean Judge closed in Mar 2026. Shizune tracks 11 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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