NOTES RELATED TO THE CONSOLIDATED STATEMENTS OF FINANCIAL POSITION | NOTES RELATED TO THE CONSOLIDATED STATEMENTS OF FINANCIAL POSITIONFixed assetsIntangible assets other than goodwill (amounts in thousands of euros) Notes IP R&D and Other intangible assets GROSS VALUE As of December 31,2022 1,668 Business combination 4.1.2 17,098 Increase — Decrease — FX rate impact — Reclassification — As of June 30, 2023 18,766 ACCUMULATED AMORTIZATION AND IMPAIRMENT As of December 31,2022 (1,663) Increase (2) Decrease — FX rate impact — As of June 30, 2023 (1,665) NET VALUE As of December 31, 2022 5 As of June 30, 2023 17,101 Accounting Policy The Company accounts for business combinations using the acquisition method when the acquired set of activities and assets meets the definition of a business and control is transferred to the Company. The Company controls an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of acquired businesses are included in the consolidated financial statements from the date on which control commences until the date on which control ceases. The consideration transferred in the acquisition is generally measured at fair value, as are the identifiable net assets acquired. Any goodwill that arises is tested annually for impairment. Transaction costs are expensed as incurred. If share-based payment awards (replacement awards) are required to be exchanged for awards held by the acquiree's employees (acquiree's awards), then all or a portion of the amount of the acquirer's replacement awards is included in measuring the consideration transferred in the business combination. This determination is based on the market-based measure of the replacement awards compared with the market-based measure of the acquiree's awards and the extent to which the replacement awards relate to pre-combination service . On June 23, 2023, ERYTECH acquired 100% of the shares and voting interests in Pherecydes Pharma S.A. in exchange for the Company’s shares. The Company determined it obtained control of Pherecydes Pharma and it is the accounting acquirer as this date. On the same date, Pherecydes Pharma S.A. was merged into the Company. Taking control of Pherecydes Pharma S.A. will enable the Company to work towards becoming a global leader in phage therapy and other medical needs caused by antimicrobial resistance. Contribution of Pherecydes Pharma S.A. to the Company’s total expenses and net loss for the six months ended June 30, 2023 is immaterial. If the acquisition had occurred on January 1, 2023, management estimates that consolidated loss for the 6 months ended June 30, 2023 would have been approximately €17.9M. This increase in consolidated loss relates mainly to operating expenses net of research tax credit income. A. Consideration transferred (acquisition price) The following table summarizes the acquisition date fair value of each major class of consideration transferred. (In thousands of Euros) Note Equity instruments i 24,642 Replacement share-based payment awards ii 436 Total consideration transferred (acquisition price) 25,078 i. Equity instruments issued (numbers presented before the reverse stock split) The fair value of the ordinary shares issued was based on the listed share price of the Company; Number of shares Share price Value (€ thousands) Shares issued on May 15, 2023 3,101,745 0.95 2,956 Shares issued on June 23, 2023 26,575,894 0.82 21,686 Total 29,677,639 24,642 Consideration transferred to obtain control was made in 2 installments, the first on May 15, 2023 at an Erytech share price of €0.95, and the second on June 23, 2023 at an Erytech share price of €0.82. ii. Replacement share-based payment awards ln accordance with the terms of the acquisition agreement, the Group exchanged equity-settled share-based payment awards held by employees of Pherecydes Pharma S.A. (the acquiree's awards) for equity settled share-based payment awards of the Company (the replacement awards). Refer to note 3.3.3 for details of the replacement awards. The portion of the amount of the acquirer's replacement awards included in the measurement of the consideration transferred amounts to €436 thousand. The portion of the amount of the acquirer's replacement awards included as a share-based payment expense for the 6 months ended June 30, 2023 amounts to €436 thousand. B. Acquisition-related costs The total acquisition costs incurred amount to €3,413 thousand and are included in general and administrative expenses (see note 3.3.2). C. Fair value of identifiable assets acquired and liabilities assumed at acquisition date (in thousands of euros) Note 06/30/2023 IFRS Intangible assets 4.1.1 17,098 Property, plant and equipment 4.1.3 485 Rights of use 4.2 478 Other non-current assets 83 Other current assets 1,925 Cash and cash equivalents 30 Financial liabilities 4.6 (2,936) Lease obligations 4.7 (456) Other non-current liabilities (49) Other current liabilities (5,085) Net assets acquired 11,575 i. Measurement of fair values The valuation techniques used for measuring the fair value of the IP R&D was a discounted cash-flow model. The fair value is estimated as the present value of net cash flows expected to be generated by the intellectual property of two identified R&D projects. The provisional fair value amount of Pherecydes Pharma's assets includes the valuation of in progress research and development recorded under intangible assets in the amount of €17,070 thousand: • IP osteoarticular infections on prostheses (PJI) for €14,404 thousand ; • IP endocarditis (EnDoCom) for €2,666 thousand. Fair values measured on a provisional basis The fair value of Pherecydes Pharma's intangible assets (IP R&D) has been measured provisionally, pending completion of an independent valuation at of the acquisition date. If new information obtained within one year of the date of acquisition about facts and circumstances that existed at the date of acquisition identifies adjustments to the above amounts, or any additional provisions that existed at the date of acquisition, then the accounting for the acquisition will be revised. D. Provisional Goodwill Provisional Goodwill arising from the acquisition has been recognized as follows: (In thousands of Euros) Note Consideration transferred (acquisition price) A 25,078 Fair value of identifiable net assets C -11,575 Provisional Goodwill 13,503 (amounts in thousands of euros) General equipment, fixtures and fittings Plant, equipment and tooling Office equipment and computers Assets under construction TOTAL GROSS VALUE As of December 31,2022 2,914 3,111 750 — 6,775 Business combination 346 110 29 — 485 Increase 0 53 0 — 53 Decrease (155) 0 0 — (155) FX rate impact (2) (2) (1) — (5) Reclassification 0 0 0 — 0 As of June 30, 2023 3,103 3,272 778 — 7,155 ACCUMULATED DEPRECIATION AND IMPAIRMENT As of December 31, 2022 (2,701) (2,957) (725) — (6,383) Depreciation (16) (49) (9) — (74) Impairment — — — — — Decrease 155 — — — 155 FX rate impact 2 1 — — 3 Reclassification — — — — — As of As of June 30, 2023 (2,560) (3,005) (734) — (6,299) NET VALUE As of December 31, 2022 213 154 25 — 393 As of June 30, 2023 543 267 44 — 857 The main changes in the first half of 2023 relate to the business combination with Pherecydes Pharma, with a value of €485 thousand. (amounts in thousands of euros) Buildings Plant, equipment and tooling Transport equipment Office equipment and computers TOTAL GROSS VALUE As of December 31, 2022 5,673 954 119 118 6,864 Business combination 205 273 478 Increase 17 17 Decrease — FX rate impact — Reclassification — As of June 30, 2023 5,878 1,227 136 118 7,359 ACCUMULATED DEPRECIATION AND IMPAIRMENT As of December 31, 2022 (3,116) (954) (92) (118) (4,280) Increase (210) (13) (223) Decrease 87 — — — 87 FX rate impact — — — — — Reclassification 0 — — — — As of June 30, 2023 (3,239) (954) (105) (118) (4,416) NET VALUE As of December 31, 2022 2,557 — 27 — 2,584 As of June 30, 2023 2,639 273 31 — 2,943 The remaining right of use net book value of €2,943 thousand is mainly related to the Bioserra building lease in Lyon (France) for €2,433 thousand. Business combination additions relate to leases acquired in connection with the merger with Pherecydes (see Note 4.1.2) and include: • Nantes premises for €64K; • Roussel premises for €141K; • Research equipment for €205K. (amounts in thousands of euros) 12/31/2022 6/30/2023 Trade and other receivables 76 245 Total current trade receivables 76 245 Research Tax Credit 1,484 2,603 Other receivables (including tax and social receivables) 973 1,251 Net investment in a sublease 43 0 Deposits related to leased premises 121 (40) Advance payments and deposits to suppliers 342 342 Prepaid expenses 805 1,331 Total other current assets 3,769 5,488 Research Tax Credit The Company benefits from the provisions in Articles 244 quater B and 49 septies F of the French Tax Code related to the Research Tax Credit. As of June 30, 2023, the CIR receivables included Research Tax Credit of €1,484 thousand for the 2022 financial year, €243 thousand for the CIR estimate for the first half of 2023 and €876 thousand from Pherecydes merger (CIR estimate for the first half 2023). Prepaid expenses As of December 31, 2022 and June 30, 2023, prepaid expenses are mainly related to insurance expense. (amounts in thousands of euros) 12/31/2022 06/30/2023 Current account 26,676 13,105 Term deposits 12,113 12,084 Total cash and cash equivalents as reported in statement of financial position 38,789 25,189 Bank overdrafts — — Total cash and cash equivalents as reported in statement of cash flow 38,789 25,189 As of December 31, 2022 and June 30, 2023, term deposits included a term deposit of €12 million with a maturity of one month and deposits of €0.1 million convertible into cash immediately. As of June 30, 2023, the Parent company's share capital comprised 6,075,105 shares (60,751,053 shares before reverse share split, see Note 2.9), fully paid up, with a nominal value of 1.00 euro. During the first half of 2023, the Company carried out the following capital increases (adjusted for the effects of the reverse share split): • May 2023, issue of 3,101,745 ordinary shares before reverse share split • June 2023, issue of 26,630,756 ordinary shares before reverse share split (amounts in thousands of euros) Convertible notes Conditional advances Bank loans Other Total As of December 31, 2022 — — 10,071 41 10,112 Business combination — 603 2,313 2,916 Increase — — 12 — 12 Fair value of embedded derivatives — Amortized cost — Conversion — Extinguishment of conditional advance — Repayment — — (1,243) (39) (1,282) FX rate impact (3) (3) As of June 30, 2023 — 603 11,153 (1) 11,753 Financial liabilities by maturity June 30, 2023 (in thousands of euros) Less than one year One to three years Three to five years More than five years Total Convertible notes — — — — — Conditional advances 121 481 — — 603 Bank loans 3,198 6,784 1,169 — 11,151 Other 1 — — — 1 Total financial liabilities 3,321 7,265 1,169 — 11,753 The €603 thousand business combination increase in conditional advances is due to the acquisition of Pherecydes, and concerns the Phagogram project (€118 thousand), the E.Coli project (€169 thousand) and the Phagosclin project (€345 thousand). Amounts resulting from the advantage of the conditional advance not bearing interest at a market rate are considered as grants. The impact on Pherecydes contracts is €29 thousand. (in thousands of euros) Lease Liabilities As of December 31, 2022 3,455 Business combination 456 Increase without cash impact 17 Repayment (414) Decrease without cash impact (127) FX rate impact (1) Capitalized interests — Reclassification — As of June 30, 2023 3,387 Lease liabilities by maturity (in thousands of euros) Less than one year One to three years Three to five years More than five years Total As of June 30, 2023 828 1,255 1,303 0 3,387 (amounts in thousands of euros) 12/31/2022 06/30/2023 Vendors 1,562 4,336 Vendors - accruals 3,553 4,785 Total trade and other payables 5,115 9,121 Social liabilities, taxation and social security 2,799 3,554 Fixed assets payables — — Deferred revenue 51 420 Other payables 59 59 Total other current liabilities 2,909 4,033 The increase in trade and other payables is mostly due to a €3,300 thousand increase resulting from the merger with Pherecydes. The increase in other current liabilities include a €1,339 thousand increase in accrued social and tax liabilities and a €416 thousand increase in deferred revenue resulting from the merger with Pherecydes. As of December 31, 2022 Carrying amount on the statement of financial position (1) Fair value through profit and loss Fair value through other comprehensive income Financial assets at amortized cost Financial liabilities at amortized cost Fair value Other non-current financial assets 195 195 195 Other current financial assets 464 464 464 Trade and other receivables 76 76 76 Other current assets 1,798 1,798 1,798 Cash and cash equivalents (2) 38,789 38,789 38,789 Total financial assets 41,322 38,789 — 2,533 — 41,322 Financial liabilities - non current portion (3) 7,547 7,547 7,547 Lease liabilities - non current portion (4) 2,680 2,680 2,680 Financial liabilities - current portion (3) 2,565 2,565 2,565 Lease liabilities - current portion (4) 775 775 775 Trade and other payables 5,115 5,115 5,115 Other current liabilities (6) 2,858 2,858 2,858 Total financial liabilities 21,540 — — — 21,540 21,540 As of June 30, 2023 Carrying amount on the statement of financial position (1) Fair value through profit and loss Fair value through other comprehensive income Financial assets at amortized cost Financial liabilities at amortized cost Fair value Other non-current financial assets 205 205 205 Other current financial assets 302 302 302 Trade and other receivables 245 245 245 Other current assets 3,854 3,854 3,854 Cash and cash equivalents (2) 25,189 25,189 25,189 Total financial assets 29,795 25,189 — 4,606 — 29,795 Financial liabilities - non current portion (3) 8,552 8,552 8,552 Lease liabilities - non current portion (4) 2,559 2,559 2,559 Financial liabilities - current portion (3) 3,201 3,201 3,201 Lease liabilities - current portion (4) 828 828 828 Trade and other payables 9,120 9,120 9,120 Other current liabilities (5) 3,613 3,613 3,613 Total financial liabilities 27,873 — — — 27,873 27,873 (1) The carrying amount of these assets and liabilities is a reasonable approximation of their fair value. (2) Cash and cash equivalents are comprised of money market funds and time deposit accounts, which are measured using level 1 measurements. (3) The fair value of financial liabilities is determined using level 2 measurements. (4) The fair value of lease liabilities is determined using level 2 measurements. (5) Excluding current liabilities accruals |