X0306 4 2019-09-11 0 0001000694 NOVAVAX INC NVAX 0001468534 Trizzino John C/O NOVAVAX, INC. 21 FIRSTFIELD ROAD GAITHERSBURG MD 20878 0 1 0 0 SVP, CBO and CFO Common Stock 2019-09-11 4 S 0 5578 5.7209 D 4800 D The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.69 to $5.75, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth in this footnote. /s/ John A. Herrmann III, Attorney-in-Fact 2019-09-12