This simple investment strategy will protect you if the U.S. stock market cracks By: MarketWatch October 19, 2017 at 00:01 AM EDT The key is neutralizing risk, and you can do that with a ‘short’ ETF, says Thomas H. Kee Jr. Read More >> Related Stocks: International Business Machines NDX Nasdaq Composite SPDR S&P 500 ETF Trust Standard & Poors 500 Ultrashort Russell 2000 -2X ETF Ultrashort S&P500 -2X ETF