US spot Bitcoin ETFs added 79,800 BTC in Q3 as public treasuries slowed purchases

US spot Bitcoin exchange-traded funds (ETFs) accumulated 79,800 BTC, valued at approximately $6.2 billion, during the third quarter of 2026, according to 21Shares’ latest Bitcoin Market Report. This influx marks a significant shift after the same funds reported $4.8 billion in net outflows in the previous quarter. The Q3 report from 21Shares highlights that the US spot Bitcoin ETF sector acquired nearly double the newly mined supply for the quarter. While just 41,300 BTC, worth around $2.9 billion, entered the market through mining, ETF demand absorbed substantially more, reinforcing their position as a dominant institutional buyer.