U.S. spot bitcoin ETFs have added just 4,500 BTC on a net basis in 2026, reflecting a notable slowdown in institutional demand after earlier strength in the year, according to Swissblock data.
The shift comes after a period of steady accumulation in March and April, when ETF inflows helped push bitcoin higher from levels near $65,000. In contrast, May has seen a reversal, with flows turning negative as the month draws to a close.
Swissblock highlighted that this transition is pushing its Risk Index into high-risk territory. The metric, which tracks the balance between selling pressure and market absorption, suggests that ETF demand is no longer sufficient to offset supply entering the market.
The change is significant because ETF inflows have been a key driver of bitcoin’s recent rallies, absorbing selling from miners, long-term holders, and traders taking profits. As that support weakens, prices may need to adjust lower or attract new sources of demand to maintain stability.
Bitcoin was trading around $75,800 during Asian hours on Tuesday, down roughly 2.6% over the past month and sitting near the lower end of its May range. Earlier in the month, the cryptocurrency briefly climbed above $82,000 before macroeconomic pressures pushed it back below $80,000.
Losses were also seen across the broader market, with ether, XRP, and solana trading in the red. Zcash led declines, falling about 9% on the day.
On-chain data is reinforcing the softer outlook. Measures of apparent demand have dropped to their lowest level since December, indicating reduced absorption of new supply.
In addition, CryptoOnchain reported approximately $1.74 billion in outflows from U.S. spot ETFs over the past two weeks. At the same time, retail traders have been increasing leverage in anticipation of a rebound—a setup that has historically preceded sharp liquidation events if the market moves lower.
Even so, it remains uncertain whether the current trend marks a temporary pause or a more sustained shift.
ETF flows have weakened before during this cycle without triggering deeper corrections. Meanwhile, global equity markets continue to trade near record highs, and technical indicators point to a possible “golden cross” forming in bitcoin as its 50-day moving average approaches a crossover above the 200-day average.
Still, ETF demand has been a primary channel for new capital entering the market. If that flow continues to deteriorate, the foundation supporting bitcoin’s rally since April could become increasingly fragile.
