Paris - Sanofi announced today that it intends to commence a tender offer (the 'Offer') today to acquire all of the outstanding shares of common stock of Principia Biopharma Inc. ('Principia') for $100 per share in cash, without interest thereon and net of any applicable withholding taxes.

The Offer is being made pursuant to the Agreement and Plan of Merger, dated as of August 16, 2020 (as it may be amended from time to time, the 'Merger Agreement'), by and among Principia, Sanofi and Kortex Acquisition Corp., a Delaware corporation and an indirect, wholly-owned subsidiary of Sanofi ('Purchaser').

The Offer is scheduled to expire one minute past 11:59 p.m., Eastern Time, on Friday, September 25, 2020, unless the Offer is extended in accordance with the Merger Agreement and the applicable rules and regulations of the U.S. Securities and Exchange Commission (the 'SEC').

The consummation of the Offer is subject to customary closing conditions, including the tender of at least a majority of the outstanding shares of Principia common stock, the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, and other customary conditions. Following the successful completion of the Offer, Purchaser will merge with and into Principia pursuant to Section 251(h) of the General Corporation Law of the State of Delaware, with Principia continuing as the surviving corporation and becoming an indirect, wholly-owned subsidiary of Sanofi (the 'Merger'). At the effective time of the Merger, the outstanding shares of common stock of Principia not tendered in the Offer will be converted into the right to receive the same $100 per share in cash that they would have received had they tendered their shares in the Offer.

Sanofi and Purchaser intend to commence the Offer by filing with the SEC a tender offer statement on Schedule TO. Principia intends to file a Solicitation/Recommendation Statement on Schedule 14D-9 with the SEC with respect to the Offer. Principia stockholders are urged to carefully read the relevant tender offer materials (including the offer to purchase, the related letter of transmittal and the other tender offer documents when they become available), and the Solicitation/Recommendation Statement on Schedule 14D-9 once it is available, because they contain important information that Principia stockholders should consider before making any decision regarding tendering their shares. The Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents, will be available to all holders of Principia stock at no expense to them. The tender offer materials will be available for free at the SEC's web site at www.sec.gov.

Evercore is acting as financial advisor to Sanofi and Weil, Gotshal & Manges LLP is acting as its legal counsel. Centerview Partners LLC and BofA Securities, Inc. are acting as financial advisors to Principia and Cooley LLP is acting as its legal counsel.

About Principia

Principia is a late-stage biopharmaceutical company dedicated to bringing transformative therapies to patients with significant unmet medical needs in immune-mediated diseases. Through Principia's proprietary Tailored Covalency platform, its strategy is to build and advance a pipeline of best-in-class drug candidates with significant therapeutic benefits, limit unintended side effects, improve quality of life and over time modify the course of disease. This highly reproducible approach enables the company to pursue multiple programs efficiently, having discovered three drug candidates. Rilzabrutinib, a reversible covalent BTK inhibitor, is being evaluated in a global Phase 3 clinical trial in participants with pemphigus, a Phase 1/2 clinical trial in participants with immune thrombocytopenia (ITP), and the company plans to initiate a Phase 2 clinical trial in participants with IgG4-Related Diseases and a Phase 3 trial in ITP. PRN2246/SAR442168 is a covalent BTK inhibitor which crosses the blood-brain barrier and is licensed to Sanofi. Sanofi has announced that SAR442168 has entered Phase 3 clinical trials in multiple sclerosis. PRN473 Topical, a topical reversible covalent BTK inhibitor designed for immune-mediated diseases that could benefit from localized application to the skin, is being evaluated in Phase 1 trials.

Contact:

Sally Bain

Tel: +1 781-264-1091

Email: sally.bain@sanofi.com

Sanofi and Principia Forward-Looking Statements

This communication contains forward-looking statements. Forward-looking statements are statements that are not historical facts and may 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', 'will be' and similar expressions. Although Sanofi's and Principia's management each 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 and Principia, 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, risks related to Sanofi's and Principia's ability to complete the acquisition on the proposed terms or on the proposed timeline, including the receipt of required regulatory approvals, the possibility that competing offers will be made, other risks associated with executing business combination transactions, such as the risk that the businesses will not be integrated successfully, that such integration may be more difficult, time-consuming or costly than expected or that the expected benefits of the acquisition will not be realized, risks related to future opportunities and plans for the combined company, including uncertainty of the expected financial performance and results of the combined company following completion of the proposed acquisition, disruption from the proposed acquisition making it more difficult to conduct business as usual or to maintain relationships with customers, employees, manufacturers, suppliers or patient groups, and the possibility that, if the combined company does not achieve the perceived benefits of the proposed acquisition as rapidly or to the extent anticipated by financial analysts or investors, the market price of Sanofi's shares could decline, as well as other risks related Sanofi's and Principia's respective businesses, including the ability to grow sales and revenues from existing products and to develop, commercialize or market new products, competition, including potential generic competition, the uncertainties inherent in research and development, including future clinical data and analysis, regulatory obligations and oversight by regulatory authorities, such as the FDA or the EMA, including decisions of such authorities regarding whether and when to approve any drug, device or biological application that may be filed for any product candidates as well as decisions regarding labelling and other matters that could affect the availability or commercial potential of any product candidates, the absence of a guarantee that any 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 and to complete related transactions and/or obtain regulatory clearances, risks associated with Sanofi's and Principia's 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 and market conditions, cost containment initiatives and subsequent changes thereto, and the impact that COVID-19 will have on Sanofi and Principia and their respective customers, suppliers, vendors, and other business partners, and the financial condition of any one of them, as well as on Sanofi's and Principia's employees and on the global economy as a whole. Any material effect of COVID-19 on any of the foregoing could also adversely impact Sanofi and Principia. This situation is changing rapidly and additional impacts may arise of which Sanofi and Principia are not currently aware and may exacerbate other previously identified risks. While the list of factors presented here is representative, no list should be considered a statement of all potential risks, uncertainties or assumptions that could have a material adverse effect on companies' consolidated financial condition or results of operations. The foregoing factors should be read in conjunction with the risks and cautionary statements discussed or identified in the public filings with the U.S. Securities and Exchange Commission (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, 2019, and the current reports on Form 8-K, quarterly reports on Form 10-Q and annual reports on Form 10-K filed by Principia with the SEC. The forward-looking statements speak only as of the date hereof and, other than as required by applicable law, Sanofi and Principia do not undertake any obligation to update or revise any forward-looking information or statements.

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