Fundraising Fox

Sean Judge

Investor

General Partner at Castle Island Ventures · Board director at Coin Metrics

Boston, Massachusetts

Writes $100K – $10M checks · typically $1M

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

Invests in

Crypto & Web3CybersecurityData & InfrastructureDeveloper ToolsFintech

Board director at Coin Metrics

Intro paths

→

In turn, Sean can intro founders to Coin Metrics's investors below.

Coin Metrics's investors · 9

Acrew CapitalSan Francisco · $1M – $15M checksCastle 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 checksMetastableNew York City · $3M – $30M checks

Co-founders at Coin Metrics

TR
Timothy RiceExecutive Officer, Director
TR
Tim RiceFounder

Experience

  1. Castle Island VenturesGeneral Partnercurrent2021 — presentBoston, Massachusetts, United States
  2. XFXBoard Membercurrent2025 — present
  3. ValinorBoard Membercurrent2025 — present
  4. CyclopsBoard Membercurrent2025 — present
  5. FélixBoard Membercurrent2024 — present
  6. ArchBoard Observercurrent2022 — present
  7. Eaglebrook AdvisorsBoard Membercurrent2021 — present
  8. PYORBoard Observercurrent2022 — present
  9. Try Your BestBoard Member2021 — 2026
  10. BeamBoard Member2025
  11. Coin MetricsBoard Member2018 — 2021
  12. Unchained CapitalInvestor2021Boston, Massachusetts, United States
  13. JerryInvestor2021
  14. Highland Capital PartnersPrincipal2016 — 2021
  15. Pomona CapitalSenior Associate2014 — 2016Hong Kong / New York
  16. Bank of America Merrill LynchInvestment Banking Analyst2011 — 2014New York, United States
  17. Bank of America Merrill LynchLeveraged Finance Analyst2010

Skills & more

Bloomberg4PowerPoint3Microsoft Excel1Credit Analysis2Valuation6Economics1Investment Banking3Capital Markets1Corporate Finance2Financial Modeling5Finance5Due Diligence4
+4 morePrivate EquityEquity ResearchFinancial AnalysisInvestments

From 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.

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 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..
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 University196

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

+ 190 more

Also attended The London School of Economics and Political Science (LSE)980

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

+ 974 more

Also attended Boston College High School14

Matt WalshFounding Partner at Castle Island VenturesPeter LagrotteriaInvestor at Flourish VenturesRich RobinsonInvestor at NZVCAlan SwierczynskiSenior Associate at Fifth Down CapitalRobert BrookInvestment Associate at Stand Together Ventures LabBryan MaloneyEngineering / AI at M33 Growth

+ 8 more

Shared employers

Also worked at XFX1

Oivind LorentzenPartner at Oak HC/FT

Also worked at Jerry4

Kyle SpottiswoodAnalyst at Maniv MobilityArt AgrawalFounder/CEO at JerryMusawir ShahFounder/CTO at JerryLina ZhangCo-Founder at Jerry

Also worked at Highland Capital Partners33

Amanda HersonGeneral Partner at Founder CollectiveJen HolmstromInvestor at GGV CapitalSteve HarrickInvestor at IVP (Institutional Venture Partners)Graham GardnerExecutive Partner at Flare Capital PartnersJason ScottAccelerator Operations at Blockchain BuildersDan RosenPartner at Commerce Ventures

+ 27 more

Also worked at Bank of America Merrill Lynch454

Hans TungManaging Partner at Notable CapitalAnthony LinHead of Intel Capital, Corporate Vice President at Intel CapitalNoorPartner at Clear VenturesKesha CashFounder & General Partner at Impact America FundAftab MathurManaging Director at Temasek at Golden Gate VenturesAndrew WallaceVice President, Revolution Growth at Revolution

+ 448 more