Then why has the stock been down 30%+ in After Hours trading?

'(Bloomberg) – Novavax Inc.’s experimental vaccine for Covid-19 showed signs of promise in an early-stage study, becoming the latest shot to clear initial hurdles in the race to protect against the coronavirus.'

https://www.msn.com/en-us/health/medical/novavax-covid-19-vaccine-shows-promise-in-early-study/ar-BB17zdv3