View the latest spxu stock quote and chart on msn money. Find the latest proshares ultrapro short s&p500 (spxu) stock quote, history, news and other vital information to help you with your stock trading and investing. Pairs Trading Strategy With Spxu And Spy Nysearcaspxu Seeking Alpha Proshares ultrapro short s&p500 (spxu) proshares ultrapro short s&p500. Spxu stock price after hours . Spxu support price is $13.16 and resistance is $13.58 (based on 1 day standard deviation move). Spxu premarket quote and chart. This means that using the most recent 20 day stock volatility and applying a one standard deviation move around the stock's closing price, stastically there is a 67% probability that spxu stock will trade within this expected range on the day. View spxu exchange traded fund data and compare to other etfs, stocks and exchanges. View the latest etf prices and news for better etf investing. View daily, weekly or monthly format back to when proshares ult...