ERYTECH Pharma S.A.

Declaration of Voting Results & Voting Rights Announcements • Jan 10, 2020

Monthly information related to total number of voting rights and shares composing the share capital – December 31, 2019

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

Listing markets: Euronext Paris from Euronext (Market segment C - ISIN Code: FR0011471135- Symbol: ERYP) & Nasdaq Global Select Market in the United-States (Symbol : ERYP) Website : www.erytech.com

Date	Total of shares composing the share capital	Total of brut(1) voting rights	Total of net(2) voting rights
December 31, 2018	17 940 035	19 525 606	19 523 106
January 31, 2019	17 940 035	19 525 918	19 523 418
February 28, 2019	17 940 035	19 525 792	19 523 292
March 31, 2019	17 940 035	19 525 808	19 523 308
April 30, 2019	17 940 035	19 526 588	19 524 088
May 31, 2019	17 940 035	19 526 590	19 524 090
June 30, 2019	17 940 035	19 526 590	19 524 090
July 31, 2019	17 940 035	19 526 591	19 524 091
August 31, 2019	17 940 035	19 526 591	19 524 091
September 30, 2019	17 940 035	19 526 591	19 524 091
October 31, 2019	17 940 035	19 530 032	19 527 532
November 30, 2019	17 940 035	19 534 259	19 531 759
December 31,2019	17 940 035	19 534 014	19 531 514

(1) Gross voting rights number (or « theoretical » voting rights) is used as a basis for calculating 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.