NOTIFICATION TO SHAREHOLDERS OF ANNUAL GENERAL MEETING ON 8 JUNE 2017

DATE: 3 May 2017

London (United Kingdom) - The shareholders of Stallergenes Greer plc (the “Company”) (Euronext Paris: STAGR), a biopharmaceutical company specialising in treatments for respiratory allergies, are hereby
informed that they are invited to attend the Annual General Meeting at Palais Brongniart, 28 Place de la Bourse, 75002 Paris, France, on 8 June 2017 at 2:00p.m. (CET).

Notice of the meeting is available in the “Investors” section of the Company website at www.stallergenesgreer.com. It contains the draft resolutions proposed by the Board of Directors, the explanatory notes and the main conditions under which shareholders may participate, vote and exercise their rights.

All documents are at the disposal of shareholders, as part of the Annual General Meeting, and are available at the registered office of the Company in London (40 Bernard Street, 3rd Floor, London WC1N 1LE, United Kingdom), in Antony (6 rue Alexis de Tocqueville, 92160 Antony, France) and also in the “Investors” section of the Company’s website (www.stallergenesgreer.com), in “Results & Presentations / Annual General Meeting / 2017.”