Castle Island Ventures Raises Hundreds of Millions For New Fund

The fundraising haul reflects continued institutional investor demand for private market blockchain plays

article-image

Nic Carter; Blockworks exclusive Art by Axel Rangel

share
  • The firm is expected to finalize its fundraise in the next couple of weeks, sources said
  • Castle Island has previously hit on winning VC stakes in companies including Bitwise and BlockFolio

Cryptocurrency venture capital firm Castle Island Ventures has raised hundreds of millions of dollars for its latest fund as institutional investors continue to plow capital into the space, despite record valuations. 

The huge fundraising haul reflects Castle Island’s track record of investing early — often in pre-seed or seed rounds — in some of the most successful crypto companies in the industry, according to three sources familiar with the matter who confirmed the fundraise.

Sources were granted anonymity to discuss sensitive business dealings. The precise amount raised isn’t known, and the firm declined to comment.

The new fund remains open to investors, sources said, though it’s expected to finalize its capital-raising haul in about two weeks. In the meantime, Castle Island is working to finalize commitments from a number of large investors. 

The fund, Castle Island Ventures III, is the third for the firm, which also engages in co-investment opportunities with its limited partners. This time around, sources said, Castle Island scored larger institutions as investors, branching out from the high-net worth individuals and family offices that have traditionally backed private digital asset plays. 

The third fund is set to follow the strategy of the firm’s first two vehicles — at least for the most part. Those funds earmark about 20% of capital to early-stage tokens, often coming in and investing before the token launches. 

“On one hand, these valuations are crazy high,” one source said. “On the other, LPs are looking for experienced, winning managers that can still derive a ton of alpha from this space.”

Massachusetts-based Castle Island’s portfolio includes the likes of Bitwise, BlockFi, Casa, ErisX, Matrixport, MoonPay and River Financial. 

Castle Island is led by co-founders and managers Matthew Walsh and Nic Carter, both veterans of Fidelity’s crypto investment operations. Sean Judge, formerly of Highland Capital, is a general partner.

It would likely go down as one of the largest so far this year, even as firms including Brevan Howard set up their own operations, which are expected to take in large amounts of capital.


Get the news in your inbox. Explore Blockworks newsletters:

Tags

Decoding crypto and the markets. Daily, with Byron Gilliam.

Upcoming Events

Javits Center North | 445 11th Ave

Tues - Thurs, March 24 - 26, 2026

Blockworks’ Digital Asset Summit (DAS) will feature conversations between the builders, allocators, and legislators who will shape the trajectory of the digital asset ecosystem in the US and abroad.

recent research

Report Neutrl Cover.png

Research

Neutrl is a synthetic dollar protocol designed to monetize structural inefficiencies in crypto markets, with a particular focus on hedged OTC token arbitrage. By pairing discounted locked-token purchases with delta-neutral hedging, the protocol offers yields that are less dependent on funding rate cycles than traditional cash and carry strategies. Early traction has been strong, with TVL growing from $120M to $210M following the removal of deposit caps, while sNUSD currently yields materially more than competing yield-bearing stablecoins. The key question for Neutrl is scalability: whether access to high-quality OTC deal flow and disciplined liquidity management can support continued TVL growth without compressing returns.

article-image

As Hyperliquid and Lighter battle for perps DEX dominance, Boros could capture the structural upside

article-image

Investors are often right about the future, but wrong about the returns

article-image

A look back at 2025, reflections on our industry, and what it means for Blockworks in 2026

article-image

Hyperliquid’s weekly volume trails newer rivals as a Lighter airdrop looms

article-image

Gold is having its best year since 1979, while many DeFi names are trading near multi-year lows

by Carlos /
article-image

Maple is outperforming peers on growth, yield, and revenue — while benefiting from limited supply overhang and clear value accrual

by Carlos /