Odaily News According to the US spot Bitcoin ETF data monitored by Lookonchain on May 13: 1. Grayscale GBTC reduced its holdings of 706 bitcoins, worth approximately US$44.74 million; 2. Grayscale currently holds a total of 291,084 bitcoins, worth approximately US$18.45 billion; 3. BlackRock increased its holdings of 205 bitcoins, worth approximately US$13 million, and currently holds a total of 274,755 bitcoins, worth approximately US$17.41 billion; 4. 9 Bitcoin ETFs reduced their holdings by a total of 866 bitcoins, worth approximately US$54.85 million.