SPXU delivers a very aggressive single-day bet against the S&P 500, ratcheting up the leverage to provide 3x inverse exposure to the widely followed index. The fund, like most geared inverse products, is designed to deliver its -3x exposure to the S&P 500a cap-weighted basket of 500 of the largest firms in the USfor just one trading day. Holding it for a period longer than that will introduce the effects of compounding, a dynamic that`s increasingly pronounced as you add more leverage to the strategy. The tool is designed to be held for no more than one day or your position will need to be adjusted daily.