Matt Walsh (@MattWalshInBos) — Twitter Score 238 out of 1000

Matt Walsh is a venture capitalist who co-founded Castle Island Ventures, an early-stage firm focused on public blockchains. Matt Walsh's Twitter Score is 239 out of 1000 (an Excellent rating) as of September 2026, ranking #1,682 (top 0.5%) among 486,860 tracked accounts.

Matt Walsh founded Castle Island Ventures alongside Nic Carter. Per Axios, the firm raised about $30 million from early backers including former Fidelity Investments colleagues and Highland Capital Partners, and has since closed additional funds including Castle Island Ventures II at about $50 million and Castle Island Ventures III at about $250 million. Before founding the firm, Matt Walsh previously worked at Fidelity Investments as a Vice President leading blockchain and cryptoasset initiatives.

Matt Walsh co-hosts On The Brink with Castle Island, a podcast covering public blockchain topics, active since 2019. He also publishes a weekly newsletter and maintains affiliations with Coin Metrics, Dust Identity, Groma, Hidden Road, Notabene, and Station 70. Matt Walsh's account has 17,424 followers as of September 2026 and 2,292 posts, and has been mentioned by 164 accounts a total of 393 times.

Who follows Matt Walsh on X?

The accounts that follow Matt Walsh include 851 founders, 219 angel investors, 253 influencers and 26 VCs, among them Marc Andreessen, Toly, Laura Shin, Mike Dudas, Chris Burniske and Kyle Samani.