I would think the 13F filing is the numbers you are looking for. Almost every SPAC that deSPAC’d (acquired a private company) is below the $10 mark that all SPACs close deals at, so even if this was the full list, it looks like they lost almost half, I would wager it is much more now.

Edit: here is most recent.

https://www.sec.gov/Archives/edgar/data/1321655/000095012322...