Sean Judge
InvestorGeneral Partner at Castle Island Ventures · Board director at Valinor Digital · Board director at Coin Metrics
Boston, Massachusetts
Writes $100K – $10M checks · typically $1M
Find your path to Sean
473 people in our graph share verified history with Sean — schools, employers, funds. One of them is your warm intro.
Andrew WallaceunlockedSean: together at Bank of America Merrill Lynch (2010–2012)
Sean: together at The London School of Economics and Political Science (LSE)
×4Sean: together at Highland Capital Partners
Sean: together at Coin Metrics
About
Sean Judge is a former tech investor and investment banker who applies deep mainstream finance expertise to financial-market infrastructure, consumer fintech, public-blockchain use cases, and U.S. crypto-regulation analysis.
Contact· self-published, not guessed
Likely email· guessed from name + firm domain, not firm-published
- s•••@castleisland.vcreveal100% confident
Invests in
Crypto & Web3CybersecurityData & InfrastructureDeveloper ToolsFintech
Board director at Valinor Digital
Intro paths
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In turn, Sean can intro founders to Valinor Digital's investors below.
Valinor Digital's investors · 4
Co-founders at Valinor Digital
LY
Lily YarboroughCo-Founder and CBO
CD
Connor DoughertyCo-Founder and CEO
Board director at Coin Metrics
Intro paths
→
In turn, Sean can intro founders to Coin Metrics's investors below.
Coin Metrics's investors · 10
Acrew CapitalSan Francisco · $1M – $15M checks · since 2021Castle Island VenturesBoston · $100K – $5M checks · since 2023Coinbase VenturesStamford · $100K – $10M checksCollab+CurrencyEugeneCommunitas Capital PartnersNew YorkDigital Currency GroupNew YorkDragonflyNew York City · $3M – $30M checksF-Prime CapitalCambridge · $3M – $10M checksHighland Capital PartnersCambridge · $1M – $10M checks · since 2019MetastableNew York City · $3M – $30M checks
Co-founders at Coin Metrics
TR
Tim RiceFounder
Experience
- Castle Island VenturesGeneral Partnercurrent2021 — presentBoston, Massachusetts, United States
- XFXBoard Membercurrent2025 — present
- ValinorBoard Membercurrent2025 — present
- CyclopsBoard Membercurrent2025 — present
- FélixBoard Membercurrent2024 — present
- ArchBoard Observercurrent2022 — present
- Eaglebrook AdvisorsBoard Membercurrent2021 — present
- PYORBoard Observercurrent2022 — present
- Try Your BestBoard Member2021 — 2026
- BeamBoard Member2025
- Coin MetricsBoard Member2018 — 2021
- Unchained CapitalInvestor2021Boston, Massachusetts, United States
- JerryInvestor2021
- Highland Capital PartnersPrincipal2016 — 2021
- Pomona CapitalSenior Associate2014 — 2016Hong Kong / New York
- Bank of America Merrill LynchInvestment Banking Analyst2011 — 2014New York, United States
- Bank of America Merrill LynchLeveraged Finance Analyst2010
Skills & more
Bloomberg4PowerPoint3Microsoft Excel1Credit Analysis2Valuation6Economics1Investment Banking3Capital Markets1Corporate Finance2Financial Modeling5Finance5Due Diligence4
+4 more
Private EquityEquity ResearchFinancial AnalysisInvestmentsFrom Sean's professional profile.
Deals · 1
Cyclops, Inc.Board seat
via Castle Island Ventures · filed Jul 2026 · $20M raise
Attribution from SEC filings, press coverage, and firm rosters.
Other disclosed investments
Investor
Arnac Software Ltd.Coin MetricsCyclops.ioHataPYORSendblocksTry Your Best
Sources: SEC Form D filings · curated public sources.
Colleagues at Castle Island Ventures
Andrew Brochu
Controller at Castle Island Ventures
Gretchen McCarey
Chief Financial Officer at Castle Island Ventures
Gus Coldebella
Chief Legal Officer at Castle Island Ventures
Henry Harris
Investor at Castle Island Ventures
Hunter Merghart
Venture Partner at Castle Island Ventures
Jeff Nazzaro
Advisor and Co-founder at Collective Liquidity
Laura Lentz
Executive Assistant at Castle Island Ventures
Matt Walsh
Founding Partner at Castle Island Ventures
Frequently asked questions
- Who is Sean Judge?
- Sean Judge is a former tech investor and investment banker who applies deep mainstream finance expertise to financial-market infrastructure, consumer fintech, public-blockchain use cases, and U.S. crypto-regulation analysis.
- Where does Sean Judge work?
- Sean Judge is General Partner at Castle Island Ventures and Board director at Valinor Digital and Board director at Coin Metrics.
- What does Sean Judge invest in?
- Sean Judge invests in Crypto & Web3, Cybersecurity, Data & Infrastructure, Developer Tools, Fintech.
- What check size does Sean Judge write?
- Sean Judge typically writes checks of $100K – $10M.
- What boards does Sean Judge sit on?
- Sean Judge holds tracked board seats at Cyclops, Inc..
- What companies has Sean Judge invested in?
- Investments tracked here include Arnac Software Ltd., Coin Metrics, Cyclops.io, Hata, PYOR, Sendblocks, Try Your Best.
- Where did Sean Judge go to school?
- Sean Judge studied at Vanderbilt University (Bachelor of Arts, Economics); The London School of Economics and Political Science (LSE) (Economics); Boston College High School.
Same school
Also attended Vanderbilt University427
Jacob JofeInvestor at Index VenturesRoss Perot Jr.Chairman of The Perot Group at Perot JainDavid JohnsonManaging Director at Intel Capital, North AmericaTom DriscollPrincipal at Differential VenturesSabina SmithPrincipal at Scale Venture PartnersPayton DobbsOperating Partner at Hoxton Ventures
+ 421 more
Also attended The London School of Economics and Political Science (LSE)1,642
Lee FixelFounder of AdditionPat GradyPartner at Sequoia CapitalNeil MehtaCo-founder & Managing Partner at GreenoaksCyriac ParisotInvestor at Index VenturesSofia DolfeInvestor at Index VenturesJonas VetterleInvestor at Moonfire Ventures
+ 1,636 more
Also attended Boston College High School21
Matt WalshFounding Partner at Castle Island VenturesAlex SideropoulosInvestor at Silversmith Capital PartnersPeter LagrotteriaInvestor at Flourish VenturesRich RobinsonInvestor at NZVCAlan SwierczynskiSenior Associate at Fifth Down CapitalRobert BrookInvestment Associate at Stand Together Ventures Lab
+ 15 more
