On The Fly: Pre-market Movers

HIGHER: WSP Holdings (WH), up 75.6% after agreeing to "going private" transaction... ParkerVision (PRKR), up 35.4% after saying it received favorable "markman order" in patent infringement suit against Qualcomm (QCOM)... Berry Petroleum (BRY), up 22% agreeing to stock-for-stock merger with LINN Energy (LINE) and LinnCo (LNCO) for total consideration of $4.3B, including the assumption of debt... Groupon (GRPN), up 3.4% following upgrade to Overweight from Neutral at Piper Jaffray... US Airways (LCC), up 2.6% following upgrade to Overweight at JPMorgan... UP AFTER EARNINGS: Pegasystems (PEGA), up 17.3%... Imax (IMAX), up 4.8%... Wal-Mart (WMT), up 1.3%... LOWER: VeriFone (PAY), down 35.9% after the company issues preliminary Q1 results and preliminary Q2 guidance below expectations, downgraded by at least five firms... BHP Billiton (BHP), down 2.2% following downgrade to Neutral at Citigroup... DOWN AFTER EARNINGS: Tesla (TSLA), down 5.6%... Walter Energy (WLT), down 4.8%... VASCO Data Security (VDSI), down 3%.