Groupon (GRPN) shares decline after the company announced that CFO Jason Child will step down at the end of July.
Keybanc raises its price target for Ambarella (AMBA) to $123 from $96, reiterating its 'overweight' rating.
Ambarella (AMBA) shares gain after-hours Tuesday after the company beats analysts' estimates for earnings and revenue in the first quarter of fiscal 2016.
Violin Memory (VMEM) shares fall after the company misses analysts' estimates for earnings in the first quarter of fiscal 2016.
Nabors Industries (NBR) shares rise as oil prices increase.
Plug Power (PLUG) shares gain after the company announced a new hydrogen and fuel cell expansion contract with Walmart Canada (WMT).
Seadrill (SDRL) shares are up as oil prices increase ahead of OPEC's meeting on Friday.
Noble Corp. (NE) shares gain as oil prices increased ahead of OPEC's meeting on Friday.
ReneSola (SOL) shares declined after the company missed analysts' estimates for earnings in the first quarter.
PPL Corp. (PPL) shares fell after the company completed a spinoff and reiterated its 2015 earnings forecast.