Intraday Gainers

InterDigital IDCC +13.87 on rumors of Samsung buying company's patent portfolio. NxStage Medical NXTM +12.44% on better than expected earnings. MasterCard MA +12.98 on better than expected earnings. WebMD Health WBMD +12.10 on better than expected earnings. Polypore International PPO +13.17 on better than expected earnings. World Fuel Services INT +11.90 on better than expected earnings. XL Group XL +8.44% on better than expected earnings.