X0306 4 2016-09-20 0 0001000694 NOVAVAX INC NVAX 0001287920 BOUDREAUX GAIL C/O NOVAVAX, INC. 20 FIRSTFIELD ROAD GAITHERSBURG MD 20878 1 0 0 0 Common Stock 2016-09-20 4 P 0 100000 1.4485 A 200000 D The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.44 to $1.45, inclusive. The reporting person undertakes to provide 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 2016-09-21