AAOI, HEAR, RIOT and BLCM among midday movers

Gainers: Protagonist Therapeutics (PTGX) +74%.Everspin Technologies (MRAM) +56%.American Axle & Manufacturing (AXL) +39%.PRA Group (PRAA) +34%.SAExploration (SAEX) +34%.Revolve Group (RVLV) +30%.Bellicum Pharmaceuticals (BLCM) +30%.Natural Grocers by Vitamin Cottage (NGVC) +29%.Carrols Restaurant (TAST) +28%.Riot Blockchain (RIOT) +26%.Losers: AG Mortgage Investment Trust (MITT) -25%.Hill International (HIL) -23%.ProAssurance (PRA) -20%.GTT Communications (GTT) -16%.Tetraphase Pharmaceuticals (TTPH) -16%.Catasys (CATS) -15%.Applied Optoelectronics (AAOI) -15%.Luminex (LMNX) -14%.Turtle Beach (HEAR) -14%.Cohen & Company (COHN) -13%.