More than four-fifths of U.S. Bitcoin ETF assets are tied to Coinbase in some custody role, underscoring a central bottleneck in ETF custody flows. Morgan Stanley launched the Morgan Stanley Bitcoin Trust, becoming the first US bank-affiliated asset manager to offer a cryptocurrency ETP, with Coinbase and BNY as its custody providers.
As of April 8, the U.S. bitcoin ETF complex tracked by Bitbo held about $91.71 billion in assets under management. Funds naming Coinbase as custodian or primary custodian accounted for roughly $77.10 billion of that total, or 84.1% of the entire market. Using a stricter methodology that excludes multi-custodian arrangements yields about $74.06 billion, or 80.8%.
BlackRock’s IBIT prospectus names Coinbase as its Bitcoin custodian but also discloses Anchorage as an additional available custodian, illustrating the near-dominance of Coinbase even as some issuers disclose backup options. The market does show exceptions—Fidelity self-custodies through its own digital asset subsidiary, and VanEck using Gemini—yet the weight remains heavily skewed toward Coinbase.
The concentration is reinforced by structural considerations: Coinbase is a regulated qualified custodian under New York trust rules, offering a compliance profile favored by institutional gatekeepers and facilitating a rapid ETF launch timeline. If Coinbase’s position is cemented by a finalized OCC national trust charter, the firm would operate as a federally regulated digital asset custodian, widening the gap to competitors still navigating state-by-state licenses.
A central risk is that a disruption at Coinbase could ripple across multiple ETF issuers, given the shared custody backbone. ETF structures require segregation and fiduciary duties, so a single setback—whether a technology outage, settlement bottleneck, or regulatory action—could affect funds holding more than $74 billion in custody across the market. Some issuers have begun disclosing backup custodians, but meaningful redistribution of actual BTC holdings remains limited so far.
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