About

Castle Island Ventures is a venture capital firm based in Boston, Massachusetts, founded in 2018. They focus exclusively on public blockchains and invest in infrastructure and application companies.

Key facts

Website: castleisland.vc
Type: Venture Capital
Headquarters: Cambridge, United States
Portfolio companies: 5
Stages: Seed
Series A
Cheque size: $8M to $40M
Sector focus: Authentication
Wallet
Web3
Blockchain
Fintech

Recent investments

Recent funding rounds Castle Island took part in
Date	Company	Round	Amount
2 Sept 2025	Kite	Seed	$18M
2 Jul 2024	SendBlocks	Seed	$8M
13 Dec 2023	Dynamic	Series A	$14M
8 Nov 2022	FORDEFI	Seed	$18M
28 Jun 2022	Dynamic	Seed	$8M
27 May 2021	Talos	Series A	$40M

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Frequently asked

What companies has Castle Island invested in?

Castle Island has invested in Kite, SendBlocks, Dynamic, FORDEFI, Talos and 1 more.