The S&P's Rout

Worries about a looming trade war with China resulted in the worst day for the markets all year yesterday. The S&P 500 finished down by nearly 3 percent on the day—the biggest one-day drop for the index this year.

All 11 of the S&P's sectors declined, led by a 4.2 percent drop for the tech sector.  The S&P 500 is now down 4.6 percent in the last five days, and is off 6 percent from its July 26 high.

The carnage was so thorough that only 11 stocks in the S&P 500 closed higher. Some of the more notable names in that group included Tyson Foods, Abiomed, and Newmont Goldcorp.