According to official data from Grayscale, as of January 30th, the Bitcoin holdings of its spot Bitcoin ETF GBTC reached 492,112.4534 BTC, a decrease of about 4461 from the 496,573.8166 BTC on January 29th. The current market value of GBTC's Bitcoin holdings is approximately $21,436,507,050.86 USD. The current number of circulating shares for GBTC is 550,730,100 with each share holding approximately 0.00089356 BTC.