Mark J. Casey - 01 Mar 2026 Form 4 Insider Report for NOVAVAX INC (NVAX)

Role: EVP, Chief Legal Officer
Signature: /s/ Mark J. Casey, Attorney-in-Fact
Issuer symbol: NVAX
Transactions as of: 01 Mar 2026
Net transactions value: +$1,369,370
Form type: 4
Filing time: 03 Mar 2026, 21:33:22 UTC
Previous filing: 15 Dec 2025
Next filing: 09 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Casey Mark J	EVP, Chief Legal Officer	21 FIRSTFIELD ROAD, GAITHERSBURG	/s/ Mark J. Casey, Attorney-in-Fact	03 Mar 2026	0001415297

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	NVAX	Common Stock	Options Exercise	$0	+4,000	+6.5%	$0.000000	65,159	01 Mar 2026	Direct
transaction	NVAX	Common Stock	Tax liability	$12,310	-1,214	-1.9%	$10.14	63,945	01 Mar 2026	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	NVAX	Restricted Stock Units	Options Exercise	$0	-4,000	-50%	$0.000000	4,000	01 Mar 2026	Common Stock	4,000	$0.000000	Direct	F2
transaction	NVAX	Restricted Stock Units	Award	$0	+101,000		$0.000000	101,000	02 Mar 2026	Common Stock	101,000	$0.000000	Direct	F3
transaction	NVAX	Non-Statutory Stock Opotion NQ	Award	$1,381,680	+152,000		$9.09	152,000	02 Mar 2026	Common Stock	152,000	$9.09	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents the number of shares of common stock withheld by the Company to satisfy tax withholding requirements in connection with the RSU vesting.
F2	One-third (1/3) of the RSUs subject to this grant under the Novavax, Inc. Amended and Restated 2015 Stock Incentive Plan, as amended, (the "Plan") vest on each of the first three (3) anniversaries of March 1, 2024, in each case subject to continued employment through such vesting date.
F3	One-third (1/3) of the RSUs subject to this grant under the Plan vest on each of the first three (3) anniversaries of March 2, 2026, in each case subject to continued employment through such vesting date.
F4	One quarter (1/4) of the shares subject to this option granted under the Plan vest on the first anniversary of March 2, 2026, and the remaining three-quarters (3/4) of the shares vest in equal monthly installments over the following three (3) years, in each case subject to continued employment with the Company through such vesting date.