According to TechFlow, on September 21, according to SoSoValue data, yesterday (September 20, US Eastern Time), the total net inflow of Bitcoin spot ETFs was US$91.9965 million. Yesterday, the Grayscale ETF GBTC had a daily net outflow of US$0.00, and the current historical net outflow of GBTC is US$20.069 billion. The Grayscale Bitcoin Mini Trust ETF BTC had a daily net inflow of US$13.3728 million, and the current historical total net inflow of Grayscale Bitcoin Mini Trust BTC is US$408 million.

The Bitcoin spot ETF with the largest daily net inflow yesterday was Fidelity's ETF FBTC, with a daily net inflow of $26.123 million. Currently, FBTC's total historical net inflow has reached $9.78 billion. The second largest was Ark Invest and 21Shares' ETF ARKB, with a daily net inflow of $21.9938 million. Currently, ARKB's total historical net inflow has reached $2.453 billion.

As of press time, the total net asset value of the Bitcoin spot ETF was US$57.474 billion, the ETF net asset ratio (market value as a percentage of the total market value of Bitcoin) reached 4.63%, and the historical cumulative net inflow has reached US$17.694 billion.