) are higher on the session by 6.99%, currently trading at $1.937. The stock has been moving largely higher over the past five weeks and is currently trading above the 50-day moving average. Options traders are focusing on calls today. The strike seeing the heaviest volume is the June 2012 $2.50 call, which has traded 1,600 times on open interest of 602 contracts. Calls are outpacing puts today by 100 to 1. Mattson Technology, Inc. designs, manufactures, markets, and globally supports semiconductor wafer processing equipment used in the fabrication of integrated circuits.