Nikolas Gierczyk, a California-based FTX customer, said he sold his $15.9 million claim to hedge fund Olympus Peak at a “significant 42% discount” late last year, and that FTX won approval for a bankruptcy reorganization plan this year that expects to repay customers between 129% and 146%. Gierczyk claims Olympus Peak owes him a larger payout because the fund stood to make more than $1 million from their trades.

Olympus Peak, based in Greenwich, Connecticut, did not immediately respond to a request for comment outside business hours.