Samuel Bates Martin - 02 Jan 2026 Form 4 Insider Report for Celldex Therapeutics, Inc. (CLDX)

Role: SVP AND CFO
Signature: /s/ Anthony S. Marucci, attorney-in-fact for Samuel Bates Martin
Issuer symbol: CLDX
Transactions as of: 02 Jan 2026
Net transactions value: +$50,000
Form type: 4
Filing time: 06 Jan 2026, 16:23:48 UTC
Previous filing: 09 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Martin Samuel Bates	SVP AND CFO	C/O CELLDEX THERAPEUTICS, INC., 53 FRONTAGE ROAD, SUITE 220, HAMPTON	/s/ Anthony S. Marucci, attorney-in-fact for Samuel Bates Martin	06 Jan 2026	0001709024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CLDX	Common Stock	Options Exercise	$50,000	+4,817	+17%	$10.38	32,942	02 Jan 2026	Direct

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	CLDX	Incentive Stock Option (Right to Buy)	Options Exercise	$0	-4,817	-7.6%	$0.000000	58,815	02 Jan 2026	Common Stock	4,817	$10.38	Direct	F1

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

Explanation of Responses:

Id	Content
F1	As of June 18, 2024, the option is fully vested.