Stocks Hitting 52-Week Highs By: Benzinga via Benzinga September 22, 2014 at 10:11 AM EDT Sigma-Aldrich (NASDAQ: SIAL) shares reached a new 52-week high of $137.765 after Germany's Merck KGaA (OTC: MKGAY) announced its plans ... Read More >> Related Stocks: Clorox Co Sigma-Aldrich