GW Pharma, Builders FirstSource Lead Monday's After-Hours Movers By: Benzinga via Benzinga April 13, 2015 at 19:26 PM EDT AirMedia Group Inc. (NASDAQ: AMCN) extended its earlier gains in the after-hours session Monday, increasing about 3 percent to $3.60 ... Read More >> Related Stocks: Airmedia Group Inc Builders Firstsource CSX Corp Glu Mobile Inc Gw Pharma ADR Leju Holdings Ltd ADR Norfolk Southern Union Pacific