ProShares UltraShort S&P500 ETF Posts 3.22% Weekly Decline ProShares UltraShort S&P500 (SDS) closed at $22.27, down 3.22% over the past five days. The ETF, which targets -2x the daily performance of the S&P 500, has also dropped 3.8% since January, though it remains up 13.2% year-to-date, reflecting recent market volatility.2