Bitcoin and Ethereum Spot ETF Flows Diverge: Giant Moves Reveal Hidden Market Dynamics

For the week of March 2nd to 6th, U.S. spot cryptocurrency ETFs recorded a total net inflow of $615 million, but the fund flows for Bitcoin and Ethereum showed distinctly different structural characteristics.

On the Bitcoin side, net inflows for the week reached $568.5 million, corresponding to a net purchase of 8,940 BTC. BlackRock led the way with a massive purchase of 9,930 Bitcoins, adding approximately $685 million in positions in a single week, becoming the only institution driving overall positive inflows for the week. In contrast, Fidelity reduced its holdings by 2,058 BTC, while Bitwise, ARK 21Shares, and Grayscale also reduced their holdings by 281, 76, and 81, respectively. It is worth noting that if BlackRock's purchases are excluded, the remaining institutions were net sellers overall, highlighting the extremely high concentration of funds.

The Ethereum market is more complex. Although the total net inflow for the week was $23.5 million (approximately 17,347 ETH), it was backed by fierce long-short game. BlackRock and Grayscale bought 66,110 ETH and 50,695 ETH, respectively, contributing to the main buying; while Fidelity reduced its holdings by a staggering 103,822 ETH in a single week, and its selling volume exceeded the total purchases of all other institutions. In other words, without the strong purchases of BlackRock and Grayscale, Ethereum spot ETFs would have experienced significant net outflows, and the apparent "positive inflow" in the market was actually the result of a few leading institutions hedging large redemptions. Of particular note is that Fidelity reduced its holdings of both Bitcoin and Ethereum in the same week, indicating that it was not rotating between the two types of assets, but systematically reducing its exposure to crypto assets. This may stem from customer redemptions, risk preference adjustments, or position rebalancing, but it sends a signal that institutional strategies are becoming more cautious. In contrast, BlackRock and Grayscale continue to increase their holdings, reflecting their firm belief in long-term value. Overall, Bitcoin's fund flow shows a pattern of "head dominance and decentralized selling," while Ethereum reflects a contradictory structure of "two giants supporting the bottom and a single player dominating the selling pressure." Although both recorded net inflows, the underlying drivers and the intentions of market participants are fundamentally different, and it is worth continuing to track them to determine future trends.