RegeneRx Issues Letter to Sharholders

RegeneRx Biopharmaceuticals, Inc. (OTC Bulletin Board: RGRX) (“the Company” or “RegeneRx”) today issued a letter to shareholders describing its future plans and initiatives. The letter may be viewed on RegeneRx’s home page or by following this link: http://www.regenerx.com/pdf/Letter-to-Shareholders_5-13-2013_Final.pdf

The document will also be publicly disclosed in an 8-K filing.

About RegeneRx Biopharmaceuticals, Inc. (www.regenerx.com)

RegeneRx is focused on the development of a novel therapeutic peptide, Thymosin beta 4, for tissue and organ protection, repair and regeneration. RegeneRx currently has three drug formulations in development for ophthalmic, cardiac, central nervous system and dermal indications, two strategic licensing agreements in China and the EU, and has an extensive worldwide patent portfolio covering its products.

Forward Looking Statements

Any statements in this press release that are not historical facts are forward-looking statements made under the provisions of the Private Securities Litigation Reform Act of 1995. Any forward-looking statements involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Please view these and other risks described in the Company’s filings with the Securities and Exchange Commission (“SEC”), including those identified in the “Risk Factors” section of the annual report on Form 10-K for the year ended December 31, 2012, and subsequent quarterly reports filed on Form 10-Q, as well as other filings it makes with the SEC. Any forward-looking statements in this press release represent the Company’s views only as of the date of this release and should not be relied upon as representing its views as of any subsequent date. The Company specifically disclaims any obligation to update this information, as a result of future events or otherwise, except as required by applicable law.