Castle Island Ventures
Fund Size
$250M+ across multiple funds.
Thesis
Bitcoin infrastructure, stablecoins, and financial plumbing. Castle Island's focus is on the companies building the connective tissue between Bitcoin, digital assets, and the traditional financial system, the picks-and-shovels of the industry. They bring a deeply analytical, data-driven approach rooted in their Fidelity backgrounds.
Portfolio
Blockstream, River, Voltage, NYDIG, Coin Metrics, Casa, Bitwise, Talos, MoonPay, Flipside Crypto, Matrixport, and other infrastructure companies across the ecosystem.
Why It Matters
Carter and Walsh's Fidelity pedigree gives them access to institutional LPs, while their deep technical understanding of Bitcoin makes them trusted partners for founders. Their research output (particularly Carter's) has shaped how allocators think about the space.