According to data compiled by Bloomberg, since the start of trading for ETFs, the total trading volume of GBTC is approximately $15.6 billion, while BlackRock and Fidelity funds have total trading volumes of around $7.3 billion and $5.9 billion respectively. Since the launch of physically-backed Bitcoin ETFs, nine new ones have attracted net inflows of around $8 billion, while Grayscale Fund has seen outflows of $6 billion. Grayscale Fund remains the largest with assets totaling $21 billion, followed by BlackRock ETF with assets totaling $3.4 billion and Fidelity ETF with assets totaling $2.9 billion.