US Bancorp disclosed spot Bitcoin ETF investments worth over $15 million on May 8.The company revealed investments in Fidelity's FBTC, Grayscale's GBTC, and BlackRock's IBIT, totaling $20 million.Rothschild firm separately disclosed spot Bitcoin ETF investments worth over $4.2 million on May 9.Several other companies have also disclosed investments in spot Bitcoin ETFs.