1. Stocks ended lower after a choppy trading session. The S&P 500 flirted with a correction, down 9.3% from its February 19 record close. 2. Small businesses are feeling the heat of the Trump transition, with the NFIB optimism index slipping to 100.7. 3. Bulls hoping for an oversold bounce were left holding the bag as traders chose to fade rallies rather than buy dips.