U.S. spot bitcoin ETFs surpassed $5.5 billion in daily trading volume as of Monday's U.S. stock market close, the second highest in history, according to data summarized by Bloomberg analyst Eric Balchunas. Of that, $2.4 billion was traded in BlackRock's IBIT alone, which has more than $1.1 billion in assets under management. Other volume figures are: Grayscale: $1.5 billion; Fidelity: $1 billion; ARK: $245 million; Bitwise: $163 million; VanEck: $27 million; Invesco: $25 million; WisdomTree: $16 million; Franklin Templeton; Valkyrie: $5 million.