BlackRock and Fidelity have significantly increased their holdings in spot Bitcoin ETFs, now owning a combined total of 445,429 BTC worth $30.6 billion. This represents an increase from previous holdings, with BlackRock adding 1,321 BTC worth $89.7 million and Fidelity contributing to the total. These ETFs now hold 231,029 more Bitcoin than MicroStrategy. Additionally, 9 ETFs added 1,228 BTC worth $83.4 million, while Grayscale decreased its holdings by 243 BTC. BlackRock has also added Bitcoin exposure to its Strategic Income Opportunities Portfolio, marking a substantial move in the cryptocurrency market.