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Form 8-K

sec.gov

8-K — Altimmune, Inc.

Accession: 0001104659-26-074575

Filed: 2026-06-16

Period: 2026-06-16

CIK: 0001326190

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Other Events

Documents

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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 16, 2026

ALTIMMUNE, Inc.

(Exact name of registrant as specified in its

charter)

Delaware

001-32587

20-2726770

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

910 Clopper Road, Suite 201S

Gaithersburg, Maryland

20878

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number including

area code: (240) 654-1450

Not Applicable

(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 class

Trading Symbol(s)

Name of each exchange on which registered

Common stock, par value $0.0001 per share

ALT

The NASDAQ Global 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 8.01 Other Events.

On June 16, 2026, Altimmune,

Inc. (the “Company”) announced plans to relocate its corporate headquarters from Gaithersburg, Maryland to Morristown, New

Jersey later this year. The new headquarters is in a geography with a strong presence of biopharmaceutical companies, which is expected

to support the Company’s ability to attract top-tier talent in its hybrid business model, as the Company continues its growth as

a late-stage development company.

The Company has entered into an office lease agreement for the New

Jersey headquarters where the Company will make rent payments of approximately $300,000 annually for the 5-year lease term.  The

move of the headquarters is expected to help the company achieve cost efficiencies over the long term.

Cautionary Note Regarding Forward Looking Statements

This Current Report on Form 8-K and certain of the materials

filed herewith contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as

amended, including, without limitation, statements regarding the Offering and anticipated closing, and expectations regarding our

cash runway, use of capital, expenses and other future financial results. The words “may,” “might,”

“will,” “could,” “would,” “should,” “expect,” “plan,”

“anticipate,” “intend,” “believe,” “expect,” “estimate,”

“seek,” “predict,” “future,” “project,” “potential,”

“continue,” “target” and similar words or expressions are intended to identify forward-looking statements,

although not all forward-looking statements contain these identifying words. Any forward-looking statements, such as those related

to the anticipated plan to relocate the Company’s headquarters, the anticipated timing of the relocation, the potential of the

new location to assist in attracting talent, the continued growth of the company and any potential cost efficiencies created by the

move, are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ

materially from those expressed or implied by any forward-looking statements contained in this Current Report on Form 8-K. These

statements are based on management's current expectations and are not predictions of actual performance. These forward-looking

statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on, by any investor

as a guarantee, an assurance, a prediction, or a definitive statement of fact or probability. Actual events and circumstances are

difficult or impossible to predict and will differ from assumptions. These and other risks and uncertainties are described in

greater detail in the section entitled “Risk Factors” in the Company’s Annual Report on Form 10-K for the year

ended December 31, 2025 and any subsequent filings with the Securities and Exchange Commission. In addition, any forward-looking

statements represent the Company’s views only as of today and should not be relied upon as representing its views as of any

subsequent date. The Company explicitly disclaims any obligation to update any forward-looking statements. No representations or

warranties (expressed or implied) are made about the accuracy of any such forward-looking statements.

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.

ALTIMMUNE, INC.

By:

/s/ Gregory Weaver

Name: Gregory Weaver

Title: Chief Financial Officer

Dated: June 16, 2026

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