BlackRock and Grayscale have solidified their positions as the top Bitcoin-holding companies globally, according to a recent report by HODL15Capital. BlackRock holds a staggering 305,614 BTC, while Grayscale follows with 277,067 BTC. After BlackRock and Grayscale, the list includes notable names like MicroStrategy with 226,331 BTC, Fidelity holding 167,375 BTC, and Tether with 75,354 BTC.