Shares of Mercury Computer Systems Under Pressure, Down 1.8% Financial News Network Online Mercury Computer Systems (NASDAQ:MRCY) is one of today's biggest movers, down 1.8% to $13.21. The Dow Jones Industrial Average is now trading 0.4% lower to 12603 and the S&P is trading 0.2% lower to 1310. Mercury Computer Systems, Inc. designs, ... |