ERYTECH Pharma S.A.

Declaration of Voting Results & Voting Rights Announcements • Jun 3, 2015

Information related to total number of voting rights and shares composing the share capital May 2015

Article 223-16 of general regulation of french Autorité des Marchés Financiers Lyon - France

Listing market : Euronext Paris from Euronext Market segment : segment B ISIN Code : FR0011471135 website : www.erytech.com

Date	Total of shares composing the share capital	Total of brut(1) voting rights	Total of net(2) voting rights
31 January 2015	6 882 761	8 090 321	8 085 071
28 February 2015	6 886 441(3)	8 094 001	8 092 501
31 March 2015	6 886 941(3)	8 094 301	8 091 801
30 April 2015	6 888 441(3)	8 043 911	8 041 411
06 May 2015	6 888 441(3)	8 733 677(4)	8 731 177
31 May 2015	6 888 441(3)	8 728 137	8 725 637

(1) Gross voting rights number (or « theoretical » voting rights) is used as a calculus base for the crossing of the threshold. In accordance with article 223-11 of general regulation of Autorité des Marchés Financiers, this number is calculated on the basis of all shares carrying the single and double voting rights, including shares without voting rights.

(2) Without treasury shares

(3) The total of shares composing the share capital has increased with the exercise of securities giving access to the share capital. Capital increase will be recorded by delegation during the next Board of Directors.

(4) The total number of voting rights raised significantly due to the acquisition of double voting rights related to shares namely owned for more than two years.