Project to Combine STALLERGENES and GREER Laboratories

Regulatory News:

Not for release directly or indirectly in South Africa, Australia, Canada, Japan, New Zealand or the United States of America

STALLERGENES (Paris:GENP) announces that the report by Ricol Lasteyrie Corporate Finance, independent expert, is now available on its website¹.

In the webcast presentation made today, Patrick Langlois, Chairman of the Board of Directors of STALLERGENES, Christian Chavy, Chief Executive Officer of STALLERGENES, and Rick Russell, Chief Executive Officer of GREER presented the proposed combination with GREER, the terms and timetable of the transaction, as well as GREER's operations and major financial indicators.

The slides used for this presentation are available on STALLERGENES website (www.stallergenes.com). These slides include information (in particular the results of the valuation exercise using the discounted cash flow analysis) extracted from the preliminary conclusions of the independent expert and the court-appointed valuation expert (the "Experts"). The extracts do not include the entirety of the work undertaken by the Experts, which used a multi-criteria approach. The final report of the independent expert was made available today and the report of the court-appointed valuation expert is epected to be available early next week. Only the final reports will be considered binding on their respective authors.

The transaction is subject to certain customary conditions, notably the approval of the French tax authorities and confirmation by the French Autorité des marchés financiers that it will not trigger a requirement to make a public buy-out offer for STALLERGENES’ shares and the absence of any appeal against this decision (unless this latter condition is waived).

According to the planned timetable, the transaction could take effect at the latest during the third quarter of 2015, following completion of the legal formalities required for implementation. The reports of the court-appointed valuation expert will be published as soon as possible. A detailed information document will be made available to STALLERGENES shareholders by the end of the month.

ABOUT STALLERGENES

STALLERGENES is a global healthcare company specialized in the diagnosis and treatment of allergies. For more than 50 years, STALLERGENES has been continuously expanding the existing frontiers of science in order to provide allergy patients with ever more effective long lasting therapeutic options. Thanks to its innovation strategy, fueled by investments in research and development amounting to around 20% of total annual revenues as well as external partnerships, STALLERGENES is able to provide targeted allergen immunotherapy-based allergy solutions that significantly improve the lives of allergy patients around the world.

STALLERGENES operates in 23 countries and employs over 1,000 people. In 2014, the Company generated total revenues of €251 million, and more than 500,000 patients were treated with STALLERGENES products.

Forward-looking statements related to STALLERGENES

This press release may contain forward-looking statements concerning the proposed combination and the benefits expected. Such statements are based upon the current beliefs and expectations of Stallergenes’ management and are subject to risks and uncertainties. Actual results may differ from those set forth in the forward-looking statements, due to various factors. Without being exhaustive, such factors include economic situations and business conditions, including legal and product evaluation issues, fluctuations in currencies and demand, and changes in competitive factors. The Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information or future events and except as required by law.

Restrictions

This document may not be released, directly or indirectly, in South Africa, Australia, Canada, Japan, New Zealand or the United States of America. The information contained in this document does not constitute an offer to sell or to purchase or the solicitation of an offer to purchase or sell shares or other financial instruments in Ares Allergy Holding or Stallergenes in the United States of America or any other jurisdiction in which such an offer, solicitation, purchase or sale would be unlawful prior to the registration, exemption from registration or other qualification under the terms of legislation on financial instruments in such a jurisdiction. Shares in Ares Allergy Holding have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act”) or under any other legislation of any jurisdiction in the United States of America and may not be offered or sold in the United States absent registration or an applicable exemption from registration under the Securities Act. There will not be any public offering of securities in the United States.

Persons in possession of this document are required to inform themselves about and comply with these restrictions. Neither Stallergenes, nor Ares Allergy Holding or any other party to this transaction mentioned in this document accepts any liability in respect of persons who have obtained this document in violation of these restrictions.

¹ www.stallergenes.com