) are higher on the session by 2.25%, currently trading at $74.42. The stock has been moving largely higher over the past five months and is currently trading above the 50-day moving average. Options traders are buying calls on the name today. Though action has been primarily in small lots, overall call volume is now running at 2.65x the daily average with 96% of all calls traded being purchases on the offer. Sigma-Aldrich Corporation is a life science and high technology company. The company develops, manufactures, purchases and distributes a range of chemicals, biochemicals and equipment.