Altimmune Restructures Financing Agreement

Altimmune Restructures Financing Agreement

GAITHERSBURG, Md., June 22, 2018 (GLOBE

NEWSWIRE) Altimmune, Inc. (Nasdaq:ALT), a clinical-stage immunotherapeutics company focused on preventing infectious diseases, today announced it has entered into an agreement with the lead investor and one other investor in its Series B

Financing to restructure and terminate the previous arrangements. Under terms of the new agreement, these two investors, who collectively held approximately 68% of the outstanding shares of Series B preferred stock and associated warrants, will

receive cash instead of common shares as repayment of the final two installments of the Series B preferred stock. Additionally, the investors will receive a combination of cash and common stock to terminate all outstanding warrants held by them. A

portion of the cash will be in the form of a short-term note, which may be converted into shares of common stock at the election of the holder thereof upon the occurrence of certain specified events of default.

The securities offered in exchange for the warrants have not been registered under the Securities Act of 1933, as amended, and may not be offered or sold in

the United States absent registration or an applicable exemption from registration requirements.

Altimmune is a clinical-stage immunotherapeutics company focused on the development of products to stimulate robust and durable immune responses for the

prevention and treatment of infectious disease. NasoVAX our influenza vaccine candidate has unique characteristics, stimulating multiple arms of the immune system that offer the potential to stop infection and the spread of flu, while being easier

to administer through an intranasal spray. NasoShield and SparVax-L are two next-generation anthrax vaccine candidates that are intended to improve protection and safety while having favorable dosage and storage requirements compared to other

Forward-Looking Statement

statements made in this press release relating to future financial or business performance, conditions, plans, prospects, trends, or strategies and other financial and business matters, including without limitation, the prospects for commercializing

or selling any product or drug candidates, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, when or if used in this press release, the words may, could,

should, anticipate, believe, estimate, expect, intend, plan, predict and similar expressions and their variants, as they relate to Altimmune, Inc. (the

Company ) may identify forward-looking statements. The Company cautions that these forward-looking statements are subject to numerous assumptions, risks, and uncertainties, which change over time. Important factors that may cause actual

results to differ materially from the results discussed in the forward looking statements or historical experience include risks and uncertainties, including risks relating to: the terms of the Company s Series B preferred stock offering and

related warrants; our lack of financial resources and access to capital; realizing the benefits of the merger between Altimmune, Inc. and PharmAthene, Inc.; our ability to utilize the benefits of our tax assets and the results of a tax examination

initiated by the IRS; clinical trials and the commercialization of proposed product candidates (such as marketing, regulatory, product liability, supply, competition, dependence on third parties and other risks); the regulatory approval process;

dependence on intellectual property; the Company s BARDA contract and other government programs, reimbursement and regulation. Further information on the factors and risks that could affect the Company s business, financial conditions and

results of operations are contained in the Company s filings with the U.S. Securities and Exchange Commission, including under the heading Risk Factors in the Company s annual reports on Form

10-K and quarterly reports on Form 10- Q filed with the SEC, which are available at www.sec.gov.

Email: enright@altimmune.com

LifeSci Advisors, LLC