ERYTECH Pharma S.A.

Declaration of Voting Results & Voting Rights Announcements • Oct 12, 2020

Monthly information related to total number of voting rights and shares composing the share capital – September 30, 2020

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 31,2019	17 940 035	19 534 014	19 531 514
January 31, 2020	17 940 035	19 534 260	19 531 760
February 29, 2020	17 940 035	19 534 260	19 531 760
March 31, 2020	17 940 035	19 536 736	19 534 236
April 30, 2020	17 940 035	19 536 806	19 534 306
May 30, 2020	17 940 035	19 489 410	19 486 910
June 30, 2020	17 956 115	19 495 805	19 493 305
July 31, 2020	18 081 843	19 616 534	19 614 034
August 31, 2020	18 301 621	19 836 312	19 833 812
September 30,2020	18 995 590	20 530 281	20 527 781

(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.