What does the broader ETF market show? Total U.S. Spot Bitcoin ETFs reached 6.6% of the circulating supply, with combined holdings surpassing 1.3 million BTC. In fact, U.S. Spot Bitcoin ETFs now hold 6.6% of the circulating supply, while corporate treasuries account for another 7.22%. IBIT options volume surgesThe options market has shown a strong bullish tilt in recent sessions, led by BlackRock’s IBIT. At press time, it accounted for more than 50% of the U.S. spot Bitcoin ETF market, representing 3.84% of the circulating Bitcoin supply.