UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): June 17, 2015

NOVAVAX, INC.

(Exact name of registrant as specified in charter)

20 Firstfield Road

Gaithersburg, Maryland 20878

(Address of Principal Executive Offices, including Zip Code)

(240) 268-2000

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Appointment of Director Gail K. Boudreaux

On June 17, 2015, the Board of Directors (the “Board”) of Novavax, Inc. (the “Company”) appointed Gail K. Boudreaux to fill an existing vacancy in the Company’s Board. Ms. Boudreaux will serve as a Class III director and her term will expire at the Company’s 2016 annual meeting of stockholders. Ms. Boudreaux was also named to the Board’s Compensation and Nominating and Corporate Governance Committees. As compensation for her service on the Board, Ms. Boudreaux will receive an annual retainer of $40,000, as well as an additional $22,000 for her service on the Compensation and Nominating and Corporate Governance Committees. Ms. Boudreaux was also granted a stock option award of 40,000 shares of Company common stock under the Company’s 2015 Stock Incentive Plan. The Board has affirmatively determined that Ms. Boudreaux is independent and has no material direct or indirect interest in a related party transaction which requires disclosure. Ms. Boudreaux and the Company have entered into an indemnification agreement (the “Indemnification Agreement”) which will provide indemnification protection for Ms. Boudreaux in connection with her service as a director of the Company. The Indemnification Agreement is substantially similar to the form filed as Exhibit 10.19 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009, filed on March 16, 2010 and incorporated herein by reference.

On June 18, 2015, the Company issued a press release announcing Ms. Boudreaux’ appointment to the Board. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated in this Item 5.02 by reference.

The annual meeting of stockholders of the Company was held on June 18, 2015. Only stockholders of record as of April 20, 2015 (the “Record Date”) were entitled to vote at the annual meeting. As of the Record Date, there were 267,967,249 shares outstanding and entitled to vote at the annual meeting, of which 232,226,586 shares were represented by proxy, constituting a quorum on all matters voted upon. The stockholders voted on the following matters:

Proposal 1: Stockholders elected the following Class II nominees for director, each to serve until the 2018 Annual Meeting of Stockholders or until his successor is duly elected and qualified:

Proposal 2: Stockholders approved the Company’s Second Amended and Restated Certificate of Incorporation which increases the total number of authorized shares of the Company’s common stock, $0.01 par value from 300,000,000 shares to 600,000,000 shares:

Proposal 3: While a majority of the votes cast at the Annual Meeting of Stockholders were cast in favor of the proposal to Amend and Restate the Company’s By-Laws to adopt a forum selection clause, the proposal was not approved by a majority of the shares outstanding:

Proposal 4: Stockholders approved the Novavax, Inc. 2015 Stock Incentive Plan:

Proposal 5: Stockholders ratified the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2015:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX