Stocks With This Number Of Letters In Their Symbols Do Best

Many S&P 500 investors don't pay much attention to the number of letters in their stocks' symbols. But maybe they should. S&P 500 stocks with four-letter ticker symbols are trouncing those of all other lengths this year, says an Investor's Business Daily analysis of data from S&P Global Market Intelligence. They're up an average of 21.8% this year. That tops…