CIENA CORP (CIEN) 13.17 -$0.30 (-2.23%) 11:17PM (15 mins delay)

The S&P 500 is down about 3% since October 19th, as the bull market charge higher has taken at least a breather over the past week or so. As shown in the table at right, the Materials sector is down the most since 10/19 with a decline of 5.68%, followed by Financials (-4.50%), Industrials (-4.15%), and Consumer Discretionary (-3.50%). Technology is down the least since 10/19, but it is really struggling today (Nasdaq down 26 points).

While the index is down 2.89% since 10/19, the average S&P 500 stock is down 4.32%, which means investors are probably getting hit a little harder than the broad market indices show. Below is a list of the 25 worst performing stocks in the S&P 500 since 10/19. As shown, MI is down the most at -25.35%, followed by MBI, WFR, BSX, ATI, CIEN, and GNW.