Friday's Top Pre-Market Movers - Ambarella (NASDAQ:AMBA)

Avianca Holdings AVH was trading up 27.41% on news that all or part of the airline will be sold.
Talen Energy Corp. TLN up 16.18% after it announced an acquisition by Riverstone for $14.00 per share in cash.
Ambarella Inc. AMBA jumped 9.23% after the company reported better-than-expected results for its first quarter and announced $75 million buyback plan.
Broadcom Limited AVGO up 7.51% after Goldman Sachs raised price target from $171 to $185 after reporting earnings.
Achaogen Inc. AKAO traded up 7.74% after naming Tobin Shilke CFO.
Northstar Realty NRF up 3.71% after announcing it would enter a definitive merger agreement with CLNY.
Nanthealth Inc. NH jumped 4.84% after announcing commercial availability of GPS cancer and launch of GPS cancer browser on a secure mobile platform at the 2016 American Society of Clinical Oncology annual meeting.
GW Pharmaceutical GWPH traded up 3.95% after Cantor Initiated at Buy with $181 PT.
Pacific Biosciences PACB was trading up 1.77% after news that proactive investors reports GSK could be a buyer of Pacific Biosciences.