CLDX

EX-99.1

2 exh_991.htm

PRESS RELEASE

EdgarFiling

EXHIBIT 99.1

Celldex Reports Second Quarter Financial Results and Provides Corporate Update

Barzolvolimab Phase 3 chronic spontaneous urticaria studies (EMBARQ-CSU 1 and 2) ongoing, topline data expected in Sept/Oct 2026; BLA submission planned for 2027 Phase 3 barzolvolimab cold urticaria and symptomatic dermographism study (EMBARQ-ColdU and -SD) actively enrolling; Phase 2 topline data in AD expected in late 2026 Positive results from Phase 1 trial of bispecific CDX-622 showed rapid, profound, dose-dependent reductions in serum tryptase and CDX-622 was well tolerated; Phase 1 CDX-622 proof of mechanism study in asthma ongoing

HAMPTON, N.J., Aug. 06, 2026 (GLOBE NEWSWIRE) -- Celldex (NASDAQ:CLDX) today reported financial results for the second quarter ended June 30, 2026 and provided a corporate update.

“We are leaders in mast cell science with a pipeline of programs that have the potential to dramatically shift treatment paradigms for patients,” said Anthony Marucci, Co-founder, President and Chief Executive Officer at Celldex. “Barzolvolimab, followed by our first bispecific candidate CDX-622, are a powerful portfolio combination targeting inflammatory diseases where mast cells are implicated, with the goal of ultimately bringing our leading science to additional patient populations that could benefit from our medicines. We are looking forward to sharing the topline results from our two Phase 3 trials of barzolvolimab in the early fall and are actively driving towards potential commercialization.”

Recent Program Highlights

Barzolvolimab - KIT Inhibitor Program

Barzolvolimab is a humanized monoclonal antibody with a novel mechanism of action that targets mast cells by binding with high specificity to a unique part of the KIT receptor and potently inhibiting its activity. The KIT receptor is abundantly expressed by mast cells and critical for their function and survival. Mast cells are drivers of inflammatory responses such as hypersensitivity and allergic reactions and, in certain inflammatory diseases, such as chronic urticarias, mast cell activation plays a central role in the onset and progression of the disease.

Chronic Urticarias

Enrollment was completed six months ahead of guidance in the global Phase 3 program in chronic spontaneous urticaria (CSU), demonstrating strong interest in barzolvolimab. The Phase 3 program consists of two trials—EMBARQ-CSU1 and EMBARQ-CSU2. 1,939 patients were enrolled—the largest program conducted in antihistamine refractory CSU, including patients with advanced therapy experienced/refractory CSU. The studies included 43 countries and over 500 sites. EMBARQ-CSU1 and EMBARQ-CSU2 are designed to establish the efficacy and safety of barzolvolimab in adult patients with CSU who remain symptomatic despite H1 antihistamine treatment and also include patients who remain symptomatic after treatment with advanced therapies. Topline data are anticipated in September/October 2026, supporting a planned BLA filing in 2027.

In December 2025, Celldex initiated a global Phase 3 study in cold urticaria (ColdU) and symptomatic dermographism (SD)—EMBARQ-ColdU and -SD. Barzolvolimab is the first drug in development to demonstrate clinical benefit in patients with ColdU and SD in a large, randomized, placebo-controlled study. In the Phase 2 study, all primary and secondary endpoints were met with high statistical significance at 12 weeks and sustained through the end of the treatment period (20 weeks).

In June 2026, Celldex presented long-term barzolvolimab results that demonstrated sustained off-treatment improvement in patients with CSU at the European Academy of Allergy and Clinical Immunology (EAACI) Annual Meeting. Treatment with barzolvolimab resulted in rapid, significant, and durable improvements in angioedema patients with moderate to severe CSU. Seven months after the completion of dosing (Week 76), up to 64% of patients treated with barzolvolimab who had angioedema at baseline remained angioedema-free. Results support the potential of barzolvolimab to shift treatment goals from symptom control to disease modification.

Atopic Dermatitis and Prurigo Nodularis

Enrollment is complete in the Phase 2 study in atopic dermatitis (AD). This randomized, double-blind, placebo-controlled, parallel group study is evaluating the efficacy and safety profile of barzolvolimab in patients with moderate to severe AD. Topline data from this study are expected to be presented in late 2026.

Topline data from the Phase 2 study in prurigo nodularis (PN) were presented in July 2026 and demonstrated that the trial did not meet primary or key secondary endpoints. Barzolvolimab was well-tolerated and demonstrated a favorable safety profile consistent with prior studies. Rapid and profound suppression of circulating tryptase indicative of systemic mast cell depletion was observed. These data suggest that mast cells may not be the key pathogenic

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Form 8-KFalse000074421800007442182026-02-252026-02-25iso4217:USDxbrli:sharesiso4217:USDxbrli:shares

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):  February 25, 2026

Celldex Therapeutics, Inc. (Exact name of registrant as specified in its charter)

Delaware000-1500613-3191702 (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)

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)) Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, par value $.001CLDXNasdaq 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 2.02. Results of Operations and Financial Condition.

On February 25, 2026, Celldex Therapeutics, Inc. (the "Company") issued a press release announcing its financial results for the fourth quarter and year ended 2025. The full text of the press release is furnished as Exhibit 99.1 hereto and is incorporated by reference herein.

The information in this Item 2.02 of this Current Report on Form 8-K and Exhibit 99.1 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 9.01. Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release of Celldex Therapeutics, Inc., dated February 25, 2026. 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: February 25, 2026By: /s/ Sam Martin Sam Martin Senior Vice President and Chief Financial Officer