UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 719, 2025

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Celldex Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

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Delaware		000-15006		13-3191702
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

Perryville III Building, 53 Frontage Road, Suite 220

Hampton, New Jersey 08827

(Address of Principal Executive Offices) (Zip Code)

(908) 200-7500

(Registrant'’s telephone number, including area code)

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

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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:

☐¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $.001	CLDX	Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐¨

Item 28.0201. ~~Results~~Other ~~of Operations and Financial Condition~~Events.

On August 719, 2025, Celldex Therapeutics, Inc. ~~(the "Company")~~ issued a press release announcing results from its ~~financial~~Phase ~~results~~2 ~~for~~Study ~~the~~of ~~second~~Barzolvolimab ~~quarter~~in ofEosinophilic ~~2025~~Esophagitis (EoE). ~~The~~A ~~full~~copy ~~text~~ of ~~the~~this press release is ~~furnished~~attached hereto as Exhibit 99.1 hereto and is incorporated by reference herein.

~~The information in this~~ Item 29.0201. ofFinancial ~~this~~Statements ~~Current Report on Form 8-K~~ and ~~Exhibit 99~~Exhibits.1 attached hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

~~Item~~(d) ~~9.01. Financial Statements and~~ Exhibits.

(d) Exhibits
99.1	Press Release of Celldex Therapeutics, Inc., dated August 19, 2025.
99.1	Press Release of Celldex Therapeutics, Inc., dated August 7, 2025.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURE

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.

	Celldex Therapeutics, Inc.
Date: August 7, 2025	By:	/s/ Sam Martin
Date: August 19, 2025	By:	/s/ Sam Martin
		Sam Martin
		Senior Vice President andChief Financial Officer
		Senior Vice President and Chief Financial Officer

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