Asset managers BlackRock and Grayscale now hold nearly 3% of the Bitcoin in circulation in their US Spot Bitcoin ETF, following an increase in inflows over the past week. The data shows that BlackRock's iShares Bitcoin Trust (IBIT) currently holds 357,736.76150 BTC, while Grayscale's GBTC holds 227,712.3295 BTC. In addition, Grayscale also holds 5,962 BTC in its Digital Big Cap Fund and 32,692.0926 BTC in its Grayscale Bitcoin Mini Trust.