According to Odaily, Bitwise's Chief Investment Officer, Matt Hougan, recently revealed that as of last Thursday, May 9, 563 professional investment firms reported owning Bitcoin ETFs valued at $3.5 billion. By the May 15 deadline for 13F filings, we could see over 700 companies with total assets under management approaching $5 billion.

For new ETFs, this level of holdings is unprecedented. Most ETFs attract only a few 13F applicants in the first few months of listing. The surge in Bitcoin ETF ownership among professional investment firms indicates a growing interest in cryptocurrency as an asset class.

However, it's important to note that the figures provided are estimates and the actual number of firms and the total value of their holdings could be higher or lower. The final figures will be known after the deadline for 13F filings.