Cboe open-close data indicates customer buyer of massive June put fly

Cboe open-close data indicates customer buyer of massive June put fly. Data confirms a customer paid 14c for the June 360/405/450 put fly this morning as the underlying ETF traded near $514.25. All legs open and the total premium outlay of $2.45M could return $787M in gains if SPY were to decline nearly 22% to the center 405 strike in the next 39 days.