PARIS and LONDON ? April 14, 2020?- Sanofi and GSK today announce that they have signed a letter of intent to develop an adjuvanted vaccine for COVID-19, using innovative technology from both companies, to help address the ongoing pandemic. Sanofi will contribute its S-protein COVID-19 antigen, which is based on recombinant DNA technology. This technology has produced an exact genetic match to proteins found on the surface of the virus, and the DNA sequence encoding this antigen has been combined into the DNA of the baculovirus expression platform, the basis of Sanofi?s licensed recombinant influenza product in the US. GSK will contribute its proven pandemic adjuvant technology. The use of an adjuvant can be of particular importance in a pandemic situation since it may reduce the amount of vaccine protein required per dose, allowing more vaccine doses to be produced and therefore contributing to protect more people. ?As the world faces this unprecedented global health crisis, it is clear that no one company can go it alone.??says Paul Hudson, Chief Executive Officer, Sanofi. ?That is why Sanofi is continuing to complement its expertise and resources with our peers, such as GSK, with the goal to create and supply sufficient quantities of vaccines that will help stop this virus.? ?This collaboration brings together two of the world?s largest vaccines companies.??says Emma Walmsley, Chief Executive Officer, GSK. ?By combining our scientific expertise, technologies and capabilities, we believe that we can help accelerate the global effort to develop a vaccine to protect as many people as possible from Covid-19.? The combination of a protein-based antigen together with an adjuvant is well-established and used in a number of vaccines available today. An adjuvant is added to some vaccines to enhance the immune response and has been shown to create a stronger and longer- lasting immunity against infections than the vaccine alone. It can also improve the likelihood of delivering an effective vaccine that can be manufactured at scale. The companies plan to initiate phase I clinical trials in the second half of 2020 and, subject to regulatory considerations, aim to complete the development required for availability by the second half of 2021. As previously announced by Sanofi, development of the recombinant-based COVID-19 vaccine candidate is being supported through funding and a collaboration with the Biomedical Advanced Research and Development Authority (BARDA), part of the office of the Assistant Secretary for Preparedness and Response at the U.S. Department of Health and Human Services. The companies plan to discuss funding support with other governments and global institutions prioritising global access. ?Strategic alliances among vaccine industry leaders are essential to make a coronavirus vaccine available as soon as possible,? says?BARDA Director, Rick A. Bright, Ph.D. ?Development of the adjuvanted recombinant-based COVID-19 vaccine candidate holds the potential to lower the vaccine dose to provide vaccine to a greater number of people to end this pandemic, and help the world become better prepared or even prevent future coronavirus outbreaks.? The companies have set up a Joint Task Force, co-chaired by David Loew, Global Head of Vaccines, Sanofi and Roger Connor, President Vaccines, GSK. The taskforce will seek to mobilize resources from both companies to look for every opportunity to accelerate the development of the candidate vaccine. Considering the extraordinary humanitarian and financial challenge of the pandemic, both companies believe that global access to COVID-19 vaccines is a priority and are committed to making any vaccine that is developed through the collaboration affordable to the public and through mechanisms that offer fair access for people in all countries. These efforts mark a significant milestone in Sanofi?s and GSK?s ongoing contributions to help fight COVID-19. The companies have entered into a Material Transfer Agreement to enable them to start working together immediately.? Full terms of the collaboration will be finalised over the next few weeks. About GSK GSK is a science-led global healthcare company with a special purpose: to help people do more, feel better, live longer. GSK is the leading manufacturer of vaccines globally.? For further information please visit www.gsk.com

About Sanofi Sanofi is dedicated to supporting people through their health challenges. We are a global biopharmaceutical company focused on human health. We prevent illness with vaccines, provide innovative treatments to fight pain and ease suffering. We stand by the few who suffer from rare diseases and the millions with long-term chronic conditions. With more than 100,000 people in 100 countries, Sanofi is transforming scientific innovation into healthcare solutions around the globe. Sanofi, Empowering Life

 

Media Relations Contact Marion Breyer Tel.: +33 (0)1 53 77 46 46 mr@sanofi.com

Investor Relations Contact Felix Lauscher Tel.: +33 (0)1 53 77 45 45 ir@sanofi.com

Sanofi Forward-Looking Statements This press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements are statements that are not historical facts. These statements include projections and estimates and their underlying assumptions, statements regarding plans, objectives, intentions and expectations with respect to future financial results, events, operations, services, product development and potential, and statements regarding future performance. Forward-looking statements are generally identified by the words ?expects?, ?anticipates?, ?believes?, ?intends?, ?estimates?, ?plans? and similar expressions. Although Sanofi?s management believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks and uncertainties, many of which are difficult to predict and generally beyond the control of Sanofi, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include among other things, the uncertainties inherent in research and development, future clinical data and analysis, including post marketing, decisions by regulatory authorities, such as the FDA or the EMA, regarding whether and when to approve any drug, device or biological application that may be filed for any such product candidates as well as their decisions regarding labelling and other matters that could affect the availability or commercial potential of such product candidates, the absence of guarantee that the product candidates if approved will be commercially successful, the future approval and commercial success of therapeutic alternatives, Sanofi?s ability to benefit from external growth opportunities, to complete related transactions and/or obtain regulatory clearances, risks associated with intellectual property and any related pending or future litigation and the ultimate outcome of such litigation, trends in exchange rates and prevailing interest rates, volatile economic conditions, the impact of cost containment initiatives and subsequent changes thereto, the average number of shares outstanding as well as those discussed or identified in the public filings with the SEC and the AMF made by Sanofi, including those listed under ?Risk Factors? and ?Cautionary Statement Regarding Forward-Looking Statements? in Sanofi?s annual report on Form 20-F for the year ended December 31, 2018. Other than as required by applicable law, Sanofi does not undertake any obligation to update or revise any forward-looking information or statements.