Stocks on the Move Now By: CNBC.com News January 31, 2012 at 12:34 PM EST Shares of the following companies are showing unusual moves in Tuesday's trading session. Read More >> Related Stocks: Edwards Lifesciences GX Defense Tech ETF Gentex Corp Hologic Inc McKesson Corp Meritage Corp Paccar Inc Potlatch Cp Rent-A-Center Inc Under Armour Waddell & Reed Financial