On The Fly: Pre-market Movers

HIGHER: PTC Therapeutics (PTCT), up 36% after the company reported data for oral SMA drug RG7916 at CureSMA that RBC Capital analyst Brian Abrahams called "impressive" and prompted him to upgrade the stock to Outperform. William Blair analyst Raju Prasad also upgraded PTC Therapeutics to Outperform, saying risdiplam showed "impressive efficacy" in spinal muscular atrophy... Rent-A-Center (RCII), up 22% after the company announced it has agreed to be acquired by Vintage Capital for $15 per share in cash... FleetCor (FLT), up 5% after the stock was selected to replace Time Warner (TWX) in the S&P 500 at open on June 20... JD.com (JD), up 5% after announcing Google (GOOG, GOOGL) will invest $550M in cash in JD as part of a strategic partnership. LOWER: Catalyst Biosciences (CBIO), down 52% after providing an update on the ongoing Phase 1/2 trial investigating its next generation Factor IX candidate CB 2679d/ISU304 for the treatment of severe hemophilia B... Ziopharm (ZIOP), down 7% after reporting that the FDA placed a clinical hold on its trial of CD19-targeted CAR T therapy... Zillow Group (ZG), down 3.5% after Goldman Sachs analyst Heath Terry downgraded the stock to Neutral... Biogen (BIIB), down 3%, and partner Ionis (IONS) down nearly 8% after PTC's spinal muscular atrophy data.