The granting of stock options while insiders have (bullish) material non-public information was discussed on a recent thread here with respect to CYTR (#msg-94971832). While this practice is not strictly illegal, it is unethical. (CYTR argued—lamely, IMO—that the option grants were not unethical because they were awarded on the same date in the prior year.)
In any case, I certainly wouldn’t infer that NVAX bullish news is imminent just because insiders were awarded stock otpions.