The line chart shows the daily bitcoin holdings of BlackRock and Grayscale ETFs from March 8 to June 14, 2024. It reveals a general decline in bitcoin holdings for Grayscale ending with nearly 284 thousand on June 14. BlackRock's holdings show a steady increase over the same period ending with nearly 300 thousand. BlackRock's iShares Bitcoin Trust (IBIT) overtook Grayscale Bitcoin Trust (GBTC) in assets in early June.