GW Pharma, Builders FirstSource Lead Monday's After-Hours Movers

AirMedia Group Inc. AMCN extended its earlier gains in the after-hours session Monday, increasing about 3 percent to $3.60 a share. Shares of the Chinese operator out-of-home advertising platforms including airport TV screens are up more than 73 percent in the past five trading days.

GW Pharmaceuticals PLC GWPH continued to tick upward in late trading Monday, changing hands recently at $20.07 a share after closing up more than 5 percent. The American Academy of Neurology issued a press release today on GW's investigational medicine, Epidiolex childhood epilepsy drug derived from cannabidiol.

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National Bank of Greece SA's Series A preferred shares (NYSE: NBG-A) rose more than 2 percent to $8.93 in the extended session on no news. The bank's common shares are down more than 75 percent this year on liquidity worries.

Glu Mobile Inc. GLUU fell more than 9 percent in the after-hours session to $4.62 a share. The San Francisco-based digital gaming company didn't issue any news.

Builders FirstSource, Inc. BLDR gave back a little of big gains seen earlier Monday, changing hands recently off about 5 percent at $11.01. The shares closed up nearly 68 percent Monday on news it will acquire building materials supplier ProBuild Holdings for $1.63 billion.

Norfolk Southern Corp. NSC declined more than 4 percent in extended trading Friday after the company issued a disappointing outlook on lower coal shipments via rail.

CSX Corp. CSX dipped more than 2 percent to $32.36. The railroad company is expected to post results Wednesday.

Union Pacific Corp. UNP sank more than 1 percent in late trading to $107 a share. The company is slated to post earnings April 23.

Pep Boys-Manny Moe and Jack PBY lost more than 3 percent after the bell to $9.30 a share on disappointing quarterly results.

Leju Holdings Ltd. LEJU gave back some of its earlier gains, changing hands recently down 2 percent to $8.94 a share. The Chinese real estate services provider had closed up earlier by 4 percent on no news.