) are lower on the session by 8.46%, currently trading at $27.38. The stock has been moving largely lower over the past three months and is currently trading below the 50-day average. Options traders are focusing on calls today. A short while ago the September 2011 $30.00 call traded 2,350 times on open interest of 2,080 contracts. Patterson Companies, Inc. is a distributor serving three markets: North American dental supply, U.S. companion-pet (dogs, cats and other common household pets) and equine veterinary supply, and the worldwide rehabilitation and assistive products supply market.