 Shares of Heat Biologics NASDAQ: HTBX popped on Thursday after the biopharmaceutical company shared promising preclinical data for its COVID-19 vaccine. As of 1:30 p.m. EDT, Heat Biologics stock was up 15 after rising as much as 23 earlier in the day. Heat Biologics said data generated at the University of Miami Miller School of Medicine showed a robust T cell driven immune response to SARS-CoV-2, the virus that causes COVID-19. 