Gainers

• Vistagen Therapeutics(NASDAQ:VTGN) shares rose 871.4% to $16.32 during Monday's regular session. Trading volume for this security as of 13:30 EST is 40.9 million, which is 18764.9% of its average full-day volume over the last 100 days. The company's market cap stands at $130.3 million.

• Nektar Therapeutics(NASDAQ:NKTR) shares increased by 89.89% to $1.01. The current volume of 138.1 million shares is 4109.5% of Nektar Therapeutics's average full-day volume over the last 100 days (last updated at 13:30 EST). The market value of their outstanding shares is at $191.3 million.

• Tabula Rasa HealthCare (NASDAQ:TRHC) stock increased by 30.84% to $10.24. Trading volume for Tabula Rasa HealthCare's...