XAIR - GFI CNR and XAIR among pre market gainers

BioDelivery Sciences International BDSI +51% Collegium Pharmaceutical to acquire BioDelivery Sciences for $5.60/share in all cash deal. Cornerstone Building Brands (NYSE:CNR) +22% CD&R makes non-binding proposal to acquire cornerstone building brands. Splunk SPLK +9% as Credit Suisse calls it a 'unique asset,' M&A reports swirl. China Online Education (NYSE:COE) +8%. Beyond Air (NASDAQ:XAIR) +7%. Axcella Health (NASDAQ:AXLA) +6% announces FDA fast track designation for AXA1125 in NASH. Gold Fields Limited (NYSE:GFI) +5%.

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GFI, CNR and XAIR among pre market gainers