one trader just took on a massive bet that us stocks will rally into the end of 2021 the flurry of trades with the spdr sp 500 etf trust spy  which took place between 1034 am and 1041 am new york time  involved call spreads maturing in each of the next three months the total cost was about 50 million should all the contracts be in the money by their respective expiration dates they would be worth 136 million  for a profit of roughly 70 according to an estimate from chris murphy cohead of derivatives strategy at susquehanna