BlackRock’s spot bitcoin (BTC) exchange-traded fund (ETF) is now the largest product of its kind, flipping Grayscale’s GBTC after a $102 million inflow on Tuesday.

IBIT holds nearly $20 billion worth of bitcoin as of Wednesday morning. Since going live in January, investors have poured in $16.5 billion to IBIT and have withdrawn $17 billion from the Grayscale fund.