Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga September 22, 2014 at 08:08 AM EDT Sigma-Aldrich (NASDAQ: SIAL) shares jumped 34.41% to $137.60 after Germany's Merck KGaA (OTC: MKGAY) announced its plans to acquire ... Read More >> Related Stocks: Best Buy Clorox Co Sigma-Aldrich T A T Tech Ltd