Nearly Two-Thirds Of The S&P 500 Already Sell Off In A Big Way

Even bullish S&P 500 investors are waiting for a market correction. But it's already here for nearly two-thirds of stocks. Roughly 300 stocks in the S&P 500 — including Trade Desk (TTD), Costar (CSGP) and Fiserv (FISV) — are down 10% or more from their 52-wee…