Opexa Therapeutics, Inc. (NASDAQ: OPXA), a biotechnology company developing Tcelna®, a patient-specific T-cell immunotherapy for the treatment of multiple sclerosis (MS), today announced the closing of the partial exercise of the over-allotment option granted to the underwriters to purchase an additional 650,000 shares of its common stock, at a price to the public of $1.50 per share, in connection with the Company’s recently announced underwritten public offering of 12,000,000 shares of common stock, bringing total gross proceeds from the offering to $18,975,000, before deducting underwriting discounts and commissions and other offering expenses payable by the Company. Aegis Capital Corp. acted as sole book-running manager for the offering. A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on August 7, 2013. The offering was made only by means of a prospectus. Copies of the prospectus relating to the offering are available on the SEC’s website at http://www.sec.gov . Copies of the prospectus may also be obtained from the offices of Aegis Capital Corp., Prospectus Department, 810 Seventh Avenue, 18 th Floor, New York, NY, 10019, via telephone at (212) 813-1010, or via email at email@example.com . This press release does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor will there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale is not permitted. About Opexa Opexa’s mission is to lead the field of Precision Immunotherapy™ by aligning the interests of patients, employees and shareholders. The Company’s leading therapy candidate, Tcelna®, is a personalized T-cell immunotherapy that is in a Phase IIb clinical development program (the Abili-T trial) for the treatment of Secondary Progressive MS. Tcelna is derived from T-cells isolated from the patient’s peripheral blood, expanded ex vivo, and reintroduced into the patients via subcutaneous injections. This process triggers a potent immune response against specific subsets of autoreactive T-cells known to attack myelin.