TONIX PHARMACEUTICALS ANNOUNCES FULL

TONIX PHARMACEUTICALS ANNOUNCES FULL

EXERCISE AND CLOSING OF UNDERWRITERS' OVER-ALLOTMENT OPTION

NEW YORK, April 13, 2017 (GLOBE NEWSWIRE)

- Tonix Pharmaceuticals Holding Corp. (TNXP) ("Tonix"), a company that is developing innovative pharmaceutical

products to address public health challenges, today announced that the underwriters of Tonix's previously announced public

offering that initially closed on April 4, 2017, have purchased an additional 270,000 shares of Tonix's common stock at a

price of $4.45 per share, before deducting the underwriting discount, in connection with the exercise in full of their over-allotment

option. Tonix has now sold a total of 2,070,000 shares of its common stock in connection with the offering, with total gross proceeds

of $9,211,500, before deducting underwriting discounts and commissions and other estimated offering expenses payable by Tonix.

Aegis Capital Corp. acted as the sole book-running

manager for the offering and Dawson James Securities, Inc. acted as a co-manager.

The shares described above were offered

pursuant to an effective shelf registration statement on Form S-3 (No. 333-197824) previously filed with the U.S. Securities and

Exchange Commission (the "SEC"). A final prospectus supplement and accompanying base prospectus describing the terms

of the offering are on file with the SEC and are available on the SEC's website located at http://www.sec.gov. Electronic

copies of the final prospectus supplement may be obtained from Aegis Capital Corp., 810 7th Avenue, 18th Floor, New York, NY 10019

or via telephone at 212-813-1010 or email: prospectus@aegiscap.com. This press release shall not constitute an offer

to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in

which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any

such state or jurisdiction.

About Tonix Pharmaceuticals Holding

Tonix is developing innovative pharmaceutical

products to address public health challenges. TNX-102 SL is in Phase 3 development and has been granted Breakthrough Therapy designation

by the FDA for the treatment of PTSD. PTSD is a serious condition characterized by chronic disability, inadequate treatment options

especially for military-related PTSD, and an overall high utilization of healthcare services that contributes to significant economic

burdens. The Protectic protective eutectic and Angstro-Technology formulation are essential elements of the proprietary

TNX-102 SL composition for which a Notice of Allowance has been issued by the U.S. Patent and Trademark Office. Other development

efforts include TNX-601 (tianeptine oxalate), a clinical candidate at Pre-IND (Investigational New Drug) application stage, designed

for daytime use for the treatment of PTSD, and TNX-801, a potential smallpox-preventing vaccine based on a live synthetic version

Forward Looking Statements

Certain statements in this press release

are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. These statements may be identified

by the use of forward-looking words such as "anticipate," "believe," "forecast," "estimate,"

"expect," and "intend," among others. These forward-looking statements are based on Tonix's current expectations

and actual results could differ materially. There are a number of factors that could cause actual events to differ materially from

those indicated by such forward-looking statements. These factors include, but are not limited to, substantial competition; our

need for additional financing; uncertainties of patent protection and litigation; uncertainties of government or third party payor

reimbursement; limited research and development efforts and dependence upon third parties; and risks related to failure to obtain

FDA clearances or approvals and noncompliance with FDA regulations. As with any pharmaceutical under development, there are significant

risks in the development, regulatory approval and commercialization of new products. Tonix does not undertake an obligation to

update or revise any forward-looking statement. Investors should read the risk factors set forth in the Annual Report on Form 10-K

for the year ended December 31, 2015, as filed with the Securities and Exchange Commission (the "SEC") on March 3,

2016, and future periodic reports filed with the SEC on or after the date hereof. All of Tonix's forward-looking statements are

expressly qualified by all such risk factors and other cautionary statements. The information set forth herein speaks only as of

Corporate Communications Contact:

Edison Advisors (investors)

Russo Partners (media)