targeting the cause of

Targeting the cause of neurodegenerative and autoimmune diseases January 2019 Disclaimer This presentation has been prepared by GeNeuro solely for use in the context of a general information meeting. All persons accessing this document must

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  1. Targeting the cause of neurodegenerative and autoimmune diseases January 2019

  2. Disclaimer This presentation has been prepared by GeNeuro solely for use in the context of a general information meeting. All persons accessing this document must agree to the restrictions and limitations set out below. This material is given in conjunction with an oral presentation and should not be taken out of context. This presentation has been prepared for information and background purposes only and the information contained herein (unless otherwise indicated) has been prepared by GeNeuro S.A. (the “Company”) . It includes only summary information and does not purport to contain comprehensive or complete information about the Company and is qualified in its entirety by the business, financial and other information that the Company is required to publish in accordance with the rules, regulations and practices applicable to companies listed on Euronext Paris. No reliance may be placed for any purposes whatsoever on the information or opinions contained in this document or on its accuracy or completeness. This presentation includes “forward -looking statements. ” Any assumptions, views or opinions (including statements, projections, forecasts or other forward-looking statements) contained in this presentation represent the assumptions, views or opinions of the Company as of the date indicated and are subject to change without notice. All information not separately sourced is from internal Company data and estimates. Any data relating to past performance contained herein is no indication as to future performance. The information in this presentation is not intended to predict actual results, and no assurances are given with respect thereto. By their nature, such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of the Company to be materially different from results, performance or achievements expressed or implied by such forward-looking statements. Such forward-looking statements are based on numerous assumptions regarding the Company’s present and future business strategies and the environment in which the Company will operate in the future. These forward-looking statements speak only as of the date of this presentation. Investors are urged to consider these factors carefully in evaluating the forward-looking statements in this presentation and not to place undue reliance on such statements. The information contained in this presentation has not been independently verified and no representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information contained herein and no reliance should be placed on it. None of the Company or any of its affiliates, advisers, connected persons or any other person accept any liability for any loss howsoever arising (in negligence or otherwise), directly or indirectly, from this presentation or its contents or otherwise arising in connection with this presentation. Any securities mentioned herein have not been and will not be registered under the United States Securities Act of 1933, as amended (the “Securities Act”) or under the securities laws of any state or other jurisdiction of the United States and may not be offered, sold, resold or delivered, directly or indirectly, in or into the United States absent registration under the Securities Act or an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws. The distribution of this presentation may be restricted by law in certain jurisdictions, and persons into whose possession these materials come should inform themselves about, and observe, any such restrictions. No public offering of securities is being made in the United States or any other jurisdiction. 2 January 2019

  3. GeNeuro’s mission To develop therapies that improve the life of patients with neurodegenerative and autoimmune diseases • Leveraging the biology of human endogenous retroviruses (HERVs) to stop key causal factors associated with these disorders • The HERV field is a new frontier pioneered by GeNeuro since 2006, based on 15 years of R&D at Institut Mérieux and INSERM • Demonstrated benefit of blocking a causal factor in an autoimmune disease in a Phase IIb clinical trial in Multiple Sclerosis 3 January 2019

  4. Human Endogenous Retroviruses (HERVs) Ancestral retroviral genomic (DNA) insertions HERV elements are latent in human genome Other repeats 3% DNA transposons 3% • Represent approximately 8% of total human genome Non-LTR • Genetic transposition leads to variable copy number, retrotransposons Other non-coding 35% DNA with non-ubiquitous copies in individuals 48% • HERVs are normally latent but may be de-repressed and transcribed to produce viral proteins HERVs Protein-coding 8% genes 3% Missing link between viral infections and poorly understood autoimmune / neurodegenerative diseases • Strong epidemiology data associates environmental viruses with diseases such as MS and T1D • However environmental viruses do not appear to play a direct role in their development The enemy within: dormant retroviruses • These viruses may de-repress HERV proteins upon awaken infection of permissive cells Engel & Hiebert, Nature Medicine, 2010 • Pathogenic HERV proteins have been implicated as causal factors in autoimmune / neurodegenerative diseases 4 Sources: Regulatory evolution of innate immunity through co-option of endogenous retroviruses; Science, Vol. 351, Issue 6277 Discovery of unfixed endogenous retrovirus insertions in diverse human populations. Proc Natl Acad Sci U S A. 2016 Human Endogenous Retrovirus Type W Envelope Protein Inhibits Oligodendroglial Precursor Cell Differentiation; Ann Neurol. 2013;74(5)A

  5. Viruses triggering HERV Proteins and link to disease Examples of pHERV Env mediated diseases • Pathogenic HERV Suspected transactivating viruses and affected organs proteins found at high HERV-W HERV-K levels in affected organs CNS White Matter CNS Gray Matter • Pathogenicity is generally EBV, HSV1, HHV6, VZV,… CMV, Toxoplasma… mediated by (abnormally Multiple Sclerosis Inflammatory Psychoses 75-100% of cases expressed) viral envelope 40-60 % of cases? proteins – pHERV Env Motor neurons • pHERV Env directed Neurotropic viruses,… Peripheral Nerves toxicities found in: CMV, … Sporadic ALS CIDP • Microglia ~ 50% of cases ? • OPCs Synovial membrane • Pancreatic beta ? islet cells RA Pancreas • Neurons Enteroviruses, • Schwan cells Coxsackie viruses … Other Diseases ? Type 1 Diabetes • Others… (Systemic lupus, 50-60 % of cases ? psoriasis, etc.) 5 Antony Nature Neuroscience 2006; Perron et al.J Gen Virol 1993; Ruprecht & Perron JAMA 2005; Christensen Rev Med Virol 2005; Nellaker Retrovirology 2006 ; Frank et al. J Infect Dis. 2006; Brown AS. Schizophr Bull. 2006; Vandenberghe et al Amyotroph Lateral Scler. 2010; Arias et al. Schizophr Res. 2012; Leboyer et al.World J Biol Psychiatry. 2013; Fung et al. Cell Death Differ. 2015. Freimanis et al. A role for human endogenous retrovirus-K (HML-2) in rheumatoid arthritis Clin Exp Immunol. 2010

  6. Recent data validates GeNeuro’s platform approach against pathogenic HERV proteins • Positive results of 270-patient RRMS Phase IIb study funded by Servier, • Consistent benefit with GNbAC1 at highest dose on three key markers of neurodegeneration linked to disease progression • Results strongly supported by preclinical evidence and mode of action rationale ➢ Clear positioning against the key unmet medical need in MS: disease progression • Successful Phase IIa in T1D • Launch of the pHERV-K monoclonal antibody program against ALS, in partnership with NIH • Wide application potential in other autoimmune and degenerative diseases 6 January 2019

  7. First mover in HERV-mediated diseases Program Pre-clinical Phase I Phase IIa Phase IIb Phase III 270 patients / 50 centers in the RRMS indication / Completed March 2018 1. GNbAC1 Multiple Sclerosis Planning next stage developments based on positive neurodegeneration 48-week results 2. GNbAC1 Safety & signal finding Phase IIa Type 1 Diabetes Launched April 2017 / 6-month data Sept. 2018, full 12-month data 2Q2019 3. GNbAC1 Phase 1c study on 24 healthy controls with doses up to 110 mg/kg / results end 2018 Pharmacology ODD granted by the US FDA 4. GNbAC1 CIDP Planning discussions with FDA to design a proof-of-concept study 5. New anti HERV-W Ab R&D collaborations with Academic labs Inflammatory Psychosis 6. Anti-HERV-K R&D Agreement with NIH in ALS ALS 7 January 2019

  8. Part 1 GeNeuro development in MS 8 January 2019

  9. 2.5 million MS patients worldwide $22.3bn market in 2017 MS is a life-long inflammatory and degenerative disorder of the central nervous system Nerve cell Neuron Normal myelin Brain impairment Vision, cognition motor coordination, equilibrium Nerve fiber Axon Damaged myelin Spinal cord • Disease onset mainly occurs in young impairment adults Walking, strength, sensation, sexuality, • Female to male ratio is 2:1 bowel / bladder control • Mean prevalence about 1/1000 Source: Inserm/Disc : F. Koulikoff. 9 January 2019

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