Big Boards - Top Losers Tuesday Jan 31 - Source: finviz.com [ 10%+ losers ] PPO Polypore International Inc. 38.08 -29.92% RSH RadioShack Corp. 7.18 -29.81% SBSA Spanish Broadcasting System Inc. 5.88 -16.95% MNKD MannKind Corp. 2.70 -14.83% QPSA Quepasa Corp. 4.30 -13.83% RTIX RTI Biologics, Inc. 3.45 -13.53% KONA Kona Grill Inc. 6.06 -13.18% RENN Renren Inc. 5.55 -12.04% PBIB Porter Bancorp Inc. 2.21 -11.60% MTH Meritage Homes Corporation 24.20 -10.90% REXX Rex Energy Corporation 9.46 -10.84% GNTX Gentex Corp. 26.87 -10.79% CHCI Comstock Homebuilding Companies Inc. 1.48 -10.30% CNH CNH Global NV 41.74 -10.28%