Sean Judge
InvestorGeneral Partner at Castle Island Ventures
Boston, Massachusetts
Writes $100K β $10M checks Β· 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.
Invests in
Crypto & Web3CybersecurityData & InfrastructureDeveloper ToolsFintech
Experience
- Castle Island VenturesGeneral Partnercurrent2021 β presentBoston, Massachusetts, United States
- XFXBoard Membercurrent2025 β present
- ValinorBoard Membercurrent2025 β present
- CyclopsBoard Membercurrent2025 β present
- FΓ©lixBoard Membercurrent2024 β present
- ArchBoard Observercurrent2022 β present
- Eaglebrook AdvisorsBoard Membercurrent2021 β present
- PYORBoard Observercurrent2022 β present
- Try Your BestBoard Member2021 β 2026
- BeamBoard Member2025
- Coin MetricsBoard Member2018 β 2021
- Unchained CapitalInvestor2021Boston, Massachusetts, United States
- JerryInvestor2021
- Highland Capital PartnersPrincipal2016 β 2021
- Pomona CapitalSenior Associate2014 β 2016Hong Kong / New York
- Bank of America Merrill LynchInvestment Banking Analyst2011 β 2014New York, United States
- Bank of America Merrill LynchLeveraged Finance Analyst2010
Education
- Vanderbilt UniversityBachelor of Arts, Economics2007 β 2011
- The London School of Economics and Political Science (LSE)Economics2009
- Boston College High School2003 β 2007
Skills & more
Bloomberg4PowerPoint3Microsoft Excel1Credit Analysis2Valuation6Economics1Investment Banking3Capital Markets1Corporate Finance2Financial Modeling5Finance5Due Diligence4
+4 more
Private EquityEquity ResearchFinancial AnalysisInvestmentsFrom Sean's professional profile.
Same school
Also attended Vanderbilt University150
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 VenturesPayton DobbsOperating Partner at Hoxton VenturesJosh KipnisHead of Marketing & Communications at AlleyCorp
+ 144 more
Also attended The London School of Economics and Political Science (LSE)796
Lee FixelFounder of AdditionPat GradyPartner at Sequoia CapitalCyriac ParisotInvestor at Index VenturesSofia DolfeInvestor at Index VenturesJonas VetterleInvestor at Moonfire VenturesLavinia FerriAssociate at P101 Ventures
+ 790 more
Shared employers
Also worked at XFX1
Also worked at Jerry1
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 Lynch397
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
+ 391 more
Deals Β· 1
Cyclops, Inc.Board seat
via Castle Island Ventures Β· filed Jul 2026 Β· $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
Laura Lentz
Executive Assistant at Castle Island Ventures
Matthew Walsh
Founding Partner at Castle Island Ventures
Nic Carter
Investor in anti-authoritarian technology; general partner at Castle Island Ventures





















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