Stocks plunge deep into bear-market territory amid European travel ban The early selling, which pushed all three of the major averages deep into bear-market territory, is on track to end the S&P 500 and Nasdaq Composite's historic bull markets that began on March 9, 2009. The Dow's bull-run ended on Wednesday. A bear market is defined by a 20 percent drop from the recent peak. More on this For more news, please go to FoxBusiness.com and watch Fox Business Network.