1 EXHIBIT 99.4 INVESTOR RIGHTS AGREEMENT THIS INVESTOR RIGHTS AGREEMENT (this "Agreement") is made as of the 19th day of December, 2000 by and between NOVAVAX, INC., a Delaware corporation (the "Company"), and KING PHARMACEUTICALS, INC., a Tennessee...Rights Agreement • January 2nd, 2001 • Novavax Inc • Biological products, (no disgnostic substances) • Delaware
