Bitcoin has been the clear institutional favorite in 2025. It maintained overwhelming dominance, consistently capturing 70-85% of the total crypto exchange-traded fund market share across the year. This concentration reflects how institutional investors have approached cryptocurrency exposure, treating Bitcoin as the primary entry point while remaining cautious about broader digital asset allocation.
Bitcoin’s dominance in the ETF market share has remained remarkably stable despite the launch of multiple alternative asset products. The $31 billion in combined flows to spot Bitcoin and Ethereum ETFs during 2025 demonstrates substantial institutional demand, though the distribution heavily favored Bitcoin.
This institutional buying through ETFs and other investment vehicles has provided consistent price support for Bitcoin throughout 2025, contributing to its relative outperformance compared to the broader cryptocurrency market. The concentration of flows suggests institutional portfolios are treating Bitcoin as distinct from other digital assets, viewing it more as a macro hedge or digital commodity rather than grouping it with the wider crypto sector.
Spot Bitcoin ETF volumes have compressed significantly over the last three weeks, with daily volumes throughout December largely struggling to break the $5 billion mark. This signals a potential shift in market participant behavior as the year draws to a close, settling into a lower range of activity reminiscent of this year’s summer lull rather than last year’s Q4 breakout.
Ethereum has captured approximately 15-30% of the ETF market share throughout 2025, representing the second-largest institutional allocation. This positioning makes ETH market share a useful gauge for broader altcoin sentiment relative to Bitcoin. The gradual expansion of Ethereum’s share from early 2025 to December indicates growing institutional comfort with the second-largest cryptocurrency, though it remains significantly overshadowed by Bitcoin allocation.
While the broader crypto market experienced chops and corrections in recent weeks, public treasury accumulation of ETH has accelerated aggressively, driven by a single corporate whale. The total balance held by public companies increased from 4.5 million ETH at the beginning of the month to 5.09 million at the time of writing.
Taking a more granular look at the data, this recent buying spree of 590,000 ETH can be attributed entirely to Tom Lee’s BitMine Immersion (BMNR). While the holdings of other notable ETH DATs have flatlined, Bitmine’s holdings have continued to expand this month. This purchasing power is derived from BitMine’s aggressive At-the-Market (ATM) equity strategy, which allows the company to issue new shares to fund its ETH acquisitions as long as its stock trades at a premium to its NAV.
Long-tail assets, including XRP, SOL, LINK, LTC, and DOGE, appear negligible in the current market share. However, many of these ETF products only received approval late in 2025, making them extremely early in their lifecycle.
This is an excerpt from The Block’s Data & Insights newsletter. Dig into the numbers making up the industry’s most thought-provoking trends.
© 2025 The Block. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.
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