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Castle Island Ventures

Investor profile

Venture capital

Castle Island Ventures has backed 3 European tech companies across 3 funding rounds between 2024 and 2025, joining rounds totalling €23M. Most active in Fintech and Deeptech. Data as of 4 Nov 2026.

Deals
3
distinct rounds
Companies
3
backed
Active span
2024–2025
2 yrs
Total round €
€23M
sum of rounds joined

Deals by year

distinct rounds / year
Castle Island Ventures — deals by year — interactive chart.
Data table
Castle Island Ventures — deals by year
20241
20252

Top sectors

by deals
Castle Island Ventures — top sectors — interactive chart.
Data table
Castle Island Ventures — top sectors
Fintech2
Deeptech1

Stages

by deals
Castle Island Ventures — stages — interactive chart.
Data table
Castle Island Ventures — stages
Other2
Seed1

Countries

by deals
Castle Island Ventures — countries — interactive chart.
Data table
Castle Island Ventures — countries
UK3

Co-investment network

shared rounds
Co-investment network — interactive chart.
Castle Island Ventures — 3 dealsCastle Island VenturesAlliance Venture — 1 shared deals · click to openAlliance VentureAmber Group — 1 shared deals · click to openAmber GroupAnchorage — 1 shared deals · click to openAnchorageAsymmetric Capital Partners — 1 shared deals · click to openAsymmetric Capital PartnersBankless — 1 shared deals · click to openBanklessCMS Holdings — 1 shared deals · click to openCMS HoldingsDaedalus — 1 shared deals · click to openDaedalusFormation — 1 shared deals · click to openFormationHypersphere — 1 shared deals · click to openHypersphereIOSG Ventures — 1 shared deals · click to openIOSG VenturesLedger — 1 shared deals · click to openLedgerNebular — 1 shared deals · click to openNebularQuantonation — 1 shared deals · click to openQuantonationRockawayX — 1 shared deals · click to openRockawayXSats Ventures — 1 shared deals · click to openSats VenturesSigil/Zeeprime — 1 shared deals · click to openSigil/ZeeprimeUTXO Management — 1 shared deals · click to openUTXO ManagementVariant — 1 shared deals · click to openVariant

Hover a node for shared-deal counts; click a co-investor to open its profile.

Best viewed on a larger screen.

Frequent co-investors

shared rounds

Portfolio

top 30 by total round €
CompanyCountryRoundsTotal €
Build on BitcoinUK1€9.2M
BOBUK1€8.1M
Project ElevenUK1€5.2M

Biggest deals

top 10 by amount
CompanyStageAmountDate
Build on BitcoinSeed€9.2M2024-03
BOBOther€8.1M2025-08
Project ElevenOther€5.2M2025-06
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