DBV Technologies (DBVT) 424B5 Prospectus supplement for primary offering

Filed Pursuant to Rule 424(b)(5)
Registration No. 333-233651

The information contained in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where such offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED JANUARY 29, 2020

PROSPECTUS SUPPLEMENT

(To prospectus dated October 1, 2019)

$125,000,000 Ordinary Shares

(including in the form of American Depositary Shares)

We are offering $125,000,000 of our ordinary shares (including in the form of American Depositary Shares, or ADSs) in a global offering.

We are offering ordinary shares in the form of ADSs in the United States, Canada and certain countries outside of Europe. The ADSs may be evidenced by American Depositary Receipts, or ADRs, and each ADS represents the right to receiveone-half of one ordinary share. We are offering ordinary shares in Europe (including France) exclusively addressed to “qualified investors” (as this term is defined under EU Regulation n°2017/1129), referred to herein as the European offering.

We have agreed to issue, at the option of the underwriters, within 30 days from the date of this prospectus, up to an aggregate of $18,750,000 of our ordinary shares in the form of ADSs to be sold to the several underwriters at the applicable offering price.

The total number of ordinary shares in the U.S. offering and European offering is subject to reallocation between them.

Our ADSs are listed on the Nasdaq Global Select Market under the symbol “DBVT.” On January 28, 2020, the last reported sale price of the ADSs on Nasdaq was $11.20 per ADS. Our ordinary shares are traded on Euronext Paris under the symbol “DBV.” On January 28, 2020, the last reported sale price of the ordinary shares on Euronext Paris was €20.40 per share, equivalent to a price of $11.23 per ADS, assuming an exchange rate of $1.1005 per euro.

Investing in our ordinary shares and ADSs involves a high degree of risk. You should review carefully the risks and uncertainties referenced under the heading “Risk Factors” on page S-8 of this prospectus supplement as well as those contained in the other documents that are incorporated by reference into this prospectus supplement or the accompanying prospectus.

	Per Ordinary Share	Per ADS	Total(1)
Public Offering Price	€	$	$
Underwriting Commission(2)	€	$	$
Proceeds to DBV Technologies (before expenses)	€	$	$

(1) Total gross proceeds from the global offering, including the European offering, are $         (assuming an exchange rate of $         per Euro). Such proceeds less underwriting commissions are $        .

(2) We refer you to “Underwriters” section of this prospectus supplement for additional information regarding underwriting compensation and estimated offering expenses.

Neither the United States Securities and Exchange Commission nor any U.S. state securities commission has approved or disapproved of these securities or passed upon the adequacy or the accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the ordinary shares and ADSs to purchasers on or about February    , 2020.

Joint-Book Running Managers

Goldman Sachs Citigroup

The date of this prospectus supplement is                , 2020.

TABLE OF CONTENTS

Prospectus Supplement

ABOUT THIS PROSPECTUS SUPPLEMENT	S-ii
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS	S-iv
PROSPECTUS SUPPLEMENT SUMMARY	S-1
THE OFFERING	S-4
SUMMARY CONSOLIDATED FINANCIAL DATA	S-6
RISK FACTORS	S-8
MARKET INFORMATION	S-13
USE OF PROCEEDS	S-14
CAPITALIZATION	S-15
DILUTION	S-16
DESCRIPTION OF SHARE CAPITAL	S-17
DESCRIPTION OF AMERICAN DEPOSITARY SHARES	S-20
MATERIAL INCOME TAX CONSIDERATIONS	S-30
UNDERWRITERS	S-39
MATERIAL CHANGES	S-46
ENFORCEMENT OF CIVIL LIABILITIES	S-46
LEGAL MATTERS	S-47
EXPERTS	S-47
WHERE YOU CAN FIND MORE INFORMATION	S-47
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE	S-48
EXPENSES	S-49

Prospectus

ABOUT THIS PROSPECTUS	1
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS	4
ABOUT DBV TECHNOLOGIES S.A.	6
RISK FACTORS	7
USE OF PROCEEDS	8
CAPITALIZATION	8
DESCRIPTION OF SHARE CAPITAL	9
DESCRIPTION OF AMERICAN DEPOSITARY SHARES	28
LIMITATIONS AFFECTING SHAREHOLDERS OF A FRENCH COMPANY	38
PLAN OF DISTRIBUTION	39
ENFORCEMENT OF CIVIL LIABILITIES	41
TAXATION	42
LEGAL MATTERS	43
EXPERTS	43
WHERE YOU CAN FIND MORE INFORMATION	44
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE	45

S-i

ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying prospectus are part of an effective “shelf” registration statement that we filed with the U.S. Securities and Exchange Commission, or the SEC, on September 6, 2019. This prospectus supplement provides you with the specific details regarding this offering. The accompanying prospectus provides you with more general information, some of which does not apply to this offering. You should rely only on the information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or any free writing prospectus that we have authorized for use in connection with this offering. To the extent information in this prospectus supplement is inconsistent with the accompanying prospectus or any of the documents incorporated by reference into this prospectus supplement and the accompanying prospectus, you should rely on this prospectus supplement. You should read and consider the information in both this prospectus supplement and the accompanying prospectus together with the additional information described under the headings “Where You Can Find More Information” and “Information Incorporated by Reference.”

Unless otherwise indicated or the context otherwise requires, references in this prospectus supplement to “DBV,” “the company,” “our company,” “we,” “us” and “our” refer to DBV Technologies S.A. and our consolidated subsidiary.

This prospectus supplement and the accompanying prospectus contain summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus supplement is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find More Information.”

Neither we, nor any agent, underwriter or dealer has authorized any person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or any related free writing prospectus prepared by or on behalf of us or to which we have referred you. This prospectus supplement, the accompanying prospectus or any related free writing prospectus do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor do this prospectus supplement, the accompanying prospectus or any related free writing prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction. If anyone provides you with different or inconsistent information, you should not rely on it. We and the underwriters take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you.

The information contained in this prospectus supplement, the accompanying prospectus and any accompanying free writing prospectus is accurate only as of the date of this prospectus supplement, the accompanying prospectus and any such accompanying free writing prospectus, regardless of the time of delivery of this prospectus supplement, the accompanying prospectus, any such accompanying free writing prospectus or of any sale of our ordinary shares or ADSs. You should not assume that the information contained in this prospectus supplement, the accompanying prospectus or any related free writing prospectus is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the document incorporated by reference, even though this prospectus supplement, the accompanying prospectus or any related free writing prospectus is delivered, or ordinary shares or ADSs are sold, on a later date. Our business, financial condition, results of operations and prospects may have changed since those dates. You should read this prospectus supplement, the accompanying prospectus, the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering, in their entirety before making an investment decision.

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For investors outside the United States: We have not done anything that would permit the offering or possession or distribution of this prospectus supplement and the accompanying prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus supplement and the accompanying prospectus must inform themselves about, and observe any restrictions relating to, the offering of the securities described herein and the distribution of this prospectus supplement and the accompanying prospectus outside the United States.

We are incorporated in France, and a majority of our outstanding securities are owned by U.S. residents. Under the rules of the SEC, we are currently eligible for treatment as a “foreign private issuer.” As a foreign private issuer, we will not be required to file periodic reports and financial statements with the SEC as frequently or as promptly as domestic registrants whose securities are registered under the Securities Exchange Act of 1934, as amended.

Presentation of Financial Information

We maintain our books and records in euros and report under International Financial Reporting Standards as issued by the International Accounting Standards Board. None of the consolidated financial statements incorporated by reference into this prospectus supplement were prepared in accordance with generally accepted accounting principles in the United States.

Our financial statements are presented in euros. All references in this prospectus supplement and the accompanying prospectus to “$,” “US$,” “U.S.$,” “U.S. dollars,” “dollars” and “USD” mean U.S. dollars and all references to “€” and “euros,” mean euros, unless otherwise noted. Throughout this prospectus supplement and the accompanying prospectus, references to ADSs mean ADSs or ordinary shares represented by ADSs, as the case may be.

Trademarks

We own various trademark registrations and applications, and unregistered trademarks and servicemarks, including “Viaskin^®,” “EPIT^™” “DBV Technologies^®,” “Abyldis^™” and our corporate logo. All other trademarks or trade names referred to in this prospectus supplement and the accompanying prospectus are the property of their respective owners. Trade names, trademarks and service marks of other companies appearing in this prospectus supplement and the accompanying prospectus are the property of their respective holders. Solely for convenience, the trademarks and trade names in this prospectus supplement and the accompanying prospectus may be referred to without the^® and^™ symbols, but such references should not be construed as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their rights thereto. We do not intend to use or display other companies’ trademarks and trade names to imply a relationship with, or endorsement or sponsorship of us by, any other companies.

S-iii

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, that involve a number of risks and uncertainties. Although our forward-looking statements reflect the good faith judgment of our management, these statements can only be based on facts and factors currently known by us. Consequently, these forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from results and outcomes discussed in the forward-looking statements.

All statements other than present and historical facts and conditions contained in this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus including statements regarding our future results of operations and financial positions, business strategy, plans and our objectives for future operations, are forward-looking statements. The words “anticipate,” “believe,” “can,” “could,” “estimate,” “expect,” “intend,” “is designed to,” “may,” “might,” “plan,” “potential,” “predict,” “objective,” “should,” or the negative of these and similar expressions identify forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

• the timing or likelihood of regulatory filings and approvals;

• our ability to continue as a going concern;

• the initiation, timing, progress and results of ourpre-clinical studies and clinical trials, and our research and development programs;

• our ability to advance product candidates into, and successfully complete, clinical trials;

• our ability to advance our Viaskin manufacturing capabilities, manufacture clinical and commercial supplies of our product candidates and comply with regulatory requirements related to the manufacturing of our product candidates;

• our ability to develop sales and marketing capabilities;

• the commercialization of our product candidates, if approved;

• the pricing and reimbursement of our product candidates, if approved;

• the implementation of our business model, strategic plans for our business, product candidates and technology;

• the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology;

• estimates of our expenses, future revenues, capital requirements and our needs for additional financing;

• the potential benefits of strategic collaboration agreements and our ability to enter into strategic arrangements;

• our ability to maintain and establish collaborations or obtain additional grant funding;

• the rate and degree of market acceptance of our product candidates, if approved by regulatory authorities;

• our financial performance;

• developments relating to our competitors and our industry, including competing therapies; and

• other risks and uncertainties, including those listed under the caption “Risk Factors” in this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus.

S-iv

As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus supplement, the accompanying prospectus and in the information incorporated by reference in this prospectus supplement and the accompanying prospectus will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

You should read this prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

This prospectus supplement, the accompanying prospectus and the information incorporated by reference in this prospectus supplement and the accompanying prospectus may contain market data and industry forecasts that were obtained from industry publications. These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. While we believe the market position, market opportunity and market size information included in this prospectus supplement, the accompanying prospectus and in the information incorporated by reference in this prospectus supplement and the accompanying prospectus is generally reliable, such information is inherently imprecise.

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PROSPECTUS SUPPLEMENT SUMMARY

This summary highlights certain information about us, this offering and selected information contained elsewhere in or incorporated by reference in this prospectus supplement. This summary is not complete and does not contain all of the information that you should consider before deciding whether to invest in our securities. For a more complete understanding of our company and this offering, we encourage you to read and consider carefully the more detailed information in this prospectus supplement and the accompanying prospectus, including the information referred to under the heading “Risk Factors” in this prospectus supplement beginning on pageS-8, the information incorporated by reference in this prospectus supplement and the accompanying prospectus, and the information included in any free writing prospectus that we have authorized for use in connection with this offering before making an investment decision.

DBV Technologies S.A.

Overview

We are a clinical-stage specialty biopharmaceutical company focused on changing the field of immunotherapy by developing a novel technology platform called Viaskin. Our therapeutic approach is based on epicutaneous immunotherapy, or EPIT, our proprietary method of delivering biologically active compounds to the immune system through intact skin using Viaskin. We have generated significant data demonstrating that Viaskin’s mechanism of action is novel and differentiated as it targets specific antigen-presenting immune cells in the skin, called Langerhans cells, which capture the antigen and migrate to the lymph node in order to activate the immune system without allowing passage of the antigen into the bloodstream, minimizing systemic exposure in the body. We are advancing this unique technology to address areas of unmet medical need, including in patients suffering from food allergies, for whom safety is paramount as the introduction of the offending allergen into their bloodstream can cause severe or life-threatening allergic reactions, such as anaphylactic shock.

Our proprietary platform is based on our epicutaneous Viaskin patch. We have designed and developed this technology internally, for which we have scalable manufacturing capabilities. Viaskin is an electrostatic patch, which may offer a convenient, self-administered,non-invasive immunotherapy to patients. Once applied on intact skin, Viaskin forms a condensation chamber, which hydrates the skin and solubilizes the antigen allowing it to penetrate the epidermis, where it is captured by Langerhans cells. Based on numerous scientific publications and our own research, we believe this unique mechanism of action has a favorable safety profile and that it generates a strong immune response that results in allergen desensitization. Our epicutaneous immunotherapy method allows us to develop product candidates addressing food allergies, as well as other unmet medical needs.

S-1

The following table summarizes our most advanced product candidates:

* US FDA Breakthrough Therapy and Fast Track designation in children

** US FDA Fast Track designation in pediatric patients two and older

We are focused on becoming the leader in discovering, developing and commercializing food allergies products. Our pipeline development strategy is based on leveraging Viaskin’s scientific profile while taking into consideration a combination of target market characteristics, which include allergen prevalence, persistence and severity. We select our target product candidates with the aim to address allergies that have high unmet medical needs.

Recent Developments

As of December 31, 2019, we had cash and cash equivalents of €172.0 million, or $193.1 million (based on the noon buying rate of the Federal Reserve Bank of New York of €1.00 to $1.1227 on December 31, 2019). The information above is based on preliminary unaudited information and management estimates for the year ended December 31, 2019, is not a comprehensive statement of our financial results, and is subject to completion of our financial closing procedures. Our independent registered public accounting firm has not conducted an audit or review of, and does not express an opinion or any other form of assurance with respect to, this preliminary estimate.

In January 2020, we announced the appointment of Ramzi Benamar as our Chief Financial Officer, effective January 6, 2020.

Also in January 2020, we announced positive topline results of the three-year, open-label extension of our Phase III PEPITES trial, or PEOPLE trial, evaluating the long-term efficacy and safety of investigational Viaskin Peanut in peanut-allergic children ages 4 to 11 years. The results demonstrated long-term clinical benefit as shown by an increase in eliciting dose, or ED, which may decrease the chance of reacting to an accidental peanut exposure. After three years, we observed that 75.9% (107/141) of patients had increased their ED from baseline, and 51.8% (73/141) of patients reached an ED of at least 1,000 mg peanut protein by year three. The safety profile of Viaskin Peanut was consistent with that observed in the clinical program to date in over 1,000 patients. During the PEOPLE trial, the most common adverse events were mild to moderate skin reactions localized to the

S-2

administration site, and there was no epinephrine use deemed related to treatment. No treatment related serious adverse events were reported. One patient experienced one case of mild anaphylaxis that was determined by the investigator to be possibly related to treatment and resolved without treatment. Treatment compliance remained high throughout the study at a mean of 98% over three years of treatment. Low discontinuations due to adverse events were observed.

Corporate Information

Our legal and commercial name is DBV Technologies S.A. We were incorporated as a société par actions simplifiée (S.A.S.) under the laws of the French Republic on March 29, 2002 for a period of 99 years and subsequently converted on March 13, 2003 into a société anonyme. We are registered at the Nanterre Commerce and Companies Register under the number 441 772 522. Our principal executive offices are located at177-181 Avenue Pierre Brossolette, 92120 Montrouge, France, and our telephone number is +33 1 55 42 78 78. Our agent for service of process in the United States is Cogency Global Inc. We maintain a corporate website atwww.dbv-technologies.com. Information contained on, or that can be accessed through, our website does not constitute a part of this prospectus supplement and the accompanying prospectus. We have included our website address in this prospectus supplement and the accompanying prospectus solely as an inactive textual reference.

Our ordinary shares in the form of ADSs have been listed on the Nasdaq Global Select Market under the symbol “DBVT” since October 22, 2014. Our ordinary shares have been trading on Euronext Paris under the symbol “DBV” since March 28, 2012.

S-3

THE OFFERING

Global offering $125,000,000 of our ordinary shares offered by us, including ordinary shares represented by American depositary shares, or ADSs, in the U.S. offering and the European offering. The total number of ordinary shares in the U.S. offering and European offering is subject to reallocation between these offerings as permitted under the applicable laws and regulations.

U.S. offering                 ordinary shares in the form of ADSs offered in the United States, Canada and certain countries outside of Europe.

European offering                 ordinary shares offered in Europe (including France).

Ordinary shares to be outstanding after this offering                 ordinary shares (including in the form of ADSs).

Option to purchase additional ordinary shares in this offering We have agreed to issue, at the option of the underwriters, within 30 days after the date of the underwriting agreement, up to $18,750,000 of our additional ordinary shares in the form of ADSs.

American Depositary Shares Each ADS representsone-half of one ordinary share, nominal value €0.10 per share. You will have the rights of an ADS holder as provided in the deposit agreement among us, the depositary and all holders and beneficial owners of ADSs issued thereunder. To better understand the terms of the ADSs, you should carefully read the section in this prospectus supplement and the accompanying prospectus titled “Description of American Depositary Shares.” We also encourage you to read the deposit agreement incorporated by reference into the registration statement of which this prospectus supplement forms a part.

Depositary Citibank, N.A.

Use of proceeds We currently intend to use the net proceeds from this offering, together with our existing cash and cash equivalents, primarily to prepare for the commercialization of Viaskin Peanut, including marketing efforts related to launch in the second half of 2020, if approved, as well as to advance the discovery and development of the Company’s product candidates using its Viaskin Platform and for working capital and general corporate purposes. See the section of this prospectus supplement titled “Use of Proceeds.”

Risk factors You should read the “Risk Factors” section of this prospectus supplement for a discussion of factors to consider carefully before deciding to invest in our ordinary shares or ADSs.

Nasdaq Global Select Market trading symbol “DBVT”

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Euronext Paris trading symbol “DBV”

The number of ordinary shares that will be outstanding after the global offering is based on 47,028,510 ordinary shares outstanding as of December 31, 2019 and excludes the following:

• 3,976,271 ordinary shares issuable upon the exercise of share options, free shares (actions gratuites) and warrants (including employee warrants (BSPCE)) issued pursuant to our share option plans and other delegations of authority from our shareholders at a weighted average exercise price of €30.64 per share (excluding 641,728 ordinary shares issuable upon the vesting of outstanding free shares that may be issued for free with no exercise price being paid); and

• 2,802,226 ordinary shares reserved for future issuance under free share plans, share option plans and other delegations of authority from our shareholders.

Unless otherwise indicated, all information contained in this prospectus supplement assumes no exercise of the underwriters’ option to purchase additional ordinary shares (which may be in the form of ADSs).

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SUMMARY CONSOLIDATED FINANCIAL DATA

The following tables summarize our consolidated historical financial data. We derived the summary consolidated statement of income (loss) data for the years ended December 31, 2016, 2017 and 2018 from our audited consolidated financial statements incorporated by reference into this prospectus supplement. The summary consolidated statement of income (loss) data for the years ended December 31, 2014 and 2015 are derived from our audited consolidated financial statements and related notes which are not incorporated by reference into this prospectus supplement. We derived the summary consolidated statement of income (loss) data for the nine months ended September 30, 2018 and 2019 and the consolidated statement of financial position data as of September 30, 2019 from our unaudited interim condensed consolidated financial statements incorporated by reference into this prospectus supplement. The unaudited consolidated financial statements were prepared in accordance with IAS 34,Interim Financial Reporting, the standard of IFRS applicable to interim financial statements. Our audited consolidated financial statements have been prepared in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. Our historical results are not necessarily indicative of the results that may be expected in the future, and our results for the nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the full fiscal year. The following information should be read in conjunction with our audited consolidated financial statements and related notes, as well as the information under the captions “Item 5. Operating and Financial Review and Prospects” appearing in ourAnnual Report on Form20-F for the year ended December 31, 2018 which is incorporated by reference herein. For more details on how you can obtain our reports and other information filed with the SEC, you should read the section of this prospectus supplement and the accompanying prospectus titled “Where You Can Find More Information.”

Consolidated Statement of Income (Loss) Data (in thousands, except share and per share data):

	Year Ended December 31,																		Nine Months Ended September 30,
	2014			2015			2016			2017			2018						2018			2019
	Euro			Euro			Euro			Euro			Euro			US$(1)			Euro			Euro			US$(2)
Operating income	€	4,762		€	6,166		€	9,084		€	11,909		€	14,537		$	16,653		€	10,260		€	9,910		$	10,807
Operating expenses:
Cost of goods sold		(136	)		(128	)		—			—			—			—			—			—			—
Research and development		(21,143	)		(34,234	)		(78,828	)		(105,232	)		(107,171	)		(122,776	)		(76,876	)		(73,673	)		(80,340	)
Sales and marketing		(13	)		(491	)		(11,282	)		(15,824	)		(32,169	)		(36,853	)		(20,785	)		(12,268	)		(13,378	)
General and administrative		(8,105	)		(16,859	)		(35,005	)		(35,837	)		(41,399	)		(47,426	)		(30,094	)		(34,803	)		(37,953	)
Total expenses		(29,397	)		(51,712	)		(125,115	)		(156,892	)		(180,739	)		(207,055	)		(127,754	)		(120,745	)		(131,672	)
Operating (loss)		(24,636	)		(45,546	)		(116,031	)		(144,983	)		(166,202	)		(190,401	)		(117,495	)		(110,835	)		(120,866	)
Financial profit (loss)		624			871			1,500			(2,709	)		141			162			1,854			(355	)		(387	)
Net (loss)	€	(24,012	)	€	(44,674	)	€	(114,531	)	€	(147,693	)	€	(166,076	)	$	(190,256	)	€	(115,640	)	€	(111,264	)	$	(121,333	)
Earnings (loss) per share(3)
Basic	€	(1.49	)	€	(2.08	)	€	(4.68	)	€	(5.97	)	€	(5.74	)	$	(6.58	)	€	(4.06	)	€	(3.27	)	$	(3.57	)
Diluted	€	(1.49	)	€	(2.08	)	€	(4.68	)	€	(5.97	)	€	(5.74	)	$	(6.58	)	€	(4.06	)	€	(3.27	)	$	(3.57	)
Number of shares used for computing
Basic		16,086,247			21,522,342			24,454,850			24,757,176			28,924,976			28,924,976			28,492,494			34,012,870			34,012,870
Diluted		16,086,247			21,522,342			24,454,850			24,757,176			28,924,976			28,924,976			28,492,494			34,012,870			34,012,870

(1) Translated solely for convenience into dollars at the noon buying rate of the Federal Reserve Bank of New York of €1.00 = $1.1456 at December 31, 2018.

(2) Translated solely for convenience into dollars at the noon buying rate of the Federal Reserve Bank of New York of €1.00 = $1.0905 at September 30, 2019.

(3) See Note 22 to our consolidated financial statements for further details on the calculation of basic and diluted loss per ordinary share.

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Consolidated Statement of Financial Position Data (in thousands):

	As of September 30, 2019
	Euro		US$(1)
Cash and cash equivalents		73,010		79,617
Total assets		154,289		168,252
Total shareholders’ equity		85,841		93,610
Total liabilities		68,448		74,643

(1) Translated solely for convenience into dollars at the noon buying rate of the Federal Reserve Bank of New York of €1.00 = $1.0905 at September 30, 2019.

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RISK FACTORS

An investment in our securities involves a high degree of risk. Before deciding whether to purchase our securities, you should carefully consider the risk factors incorporated by reference from Part I, Item 3.D. of our most recentAnnual Report on Form20-F and the other information contained in this prospectus supplement and the accompanying prospectus, as updated by those subsequent filings with the SEC under the Exchange Act, that are incorporated herein by reference. These risks could materially affect our business, results of operations or financial condition and cause the value of our securities to decline, in which case you may lose all or part of your investment. For more information, see “Where You Can Find More Information” and “Incorporation of Information by Reference.”

Risks Related to This Offering

We Have Broad Discretion In The Use Of The Net Proceeds From This Offering And May Not Use Them Effectively.

Our management will have broad discretion with respect to the use of proceeds of this offering, including for any of the purposes described in the section of this prospectus supplement titled “Use of Proceeds.” You will be relying on the judgment of our management regarding the application of the proceeds of this global offering. The results and effectiveness of the use of proceeds are uncertain, and we could spend the proceeds in ways that you do not agree with or that do not improve our results of operations or enhance the value of our ordinary shares or ADSs. Our failure to apply these funds effectively could have a material adverse effect on our business, delay the development of our product candidates and cause the price of our ordinary shares or ADSs to decline. Pending their use, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

If You Purchase Ordinary Shares or ADSs In The Global Offering, You Will Experience Substantial And Immediate Dilution.

If you purchase ordinary shares (including in the form of ADSs) in this offering, you will experience substantial and immediate dilution of $                per ordinary share in the net tangible book value as of September 30, 2019 after giving effect to this offering because the price that you pay will be substantially greater than the net tangible book value per ordinary share (including in the form of ADSs) that you acquire. This dilution is due in large part to the fact that certain of our earlier investors paid substantially less than the public offering price when they purchased their ordinary shares or ADSs. You will experience additional dilution upon exercise of any outstanding options or warrants to purchase ordinary shares under our equity incentive plans, if we issue free shares to our employees under our equity incentive plans or if we otherwise issue additional ordinary shares or ADSs below the public offering price. For a further description of the dilution that you will experience immediately after this global offering, see the section of this prospectus supplement titled “Dilution.”

You May Experience Future Dilution As A Result Of Future Equity Offerings.

In order to raise additional capital, we may in the future offer additional ordinary shares or ADSs or other securities convertible into or exchangeable for our ordinary shares. We cannot assure you that we will be able to sell shares or other securities in any other offering at a price per share that is equal to or greater than the price per ordinary share or ADS paid by investors in this offering, and investors purchasing shares or other securities in the future could have rights superior to existing shareholders. The price per share at which we sell additional ordinary shares, ADSs or other securities convertible into or exchangeable for our ordinary shares in future transactions may be higher or lower than the price per ordinary share or ADS in this offering.

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Future Sales Of Ordinary Shares Or ADSs By Existing Shareholders Could Depress The Market Price Of Our Ordinary Shares and ADSs.

As of September 30, 2019, 36,157,777 ordinary shares were issued and outstanding. Sales of a substantial number of shares of our ordinary shares or ADSs in the public market, or the perception that these sales might occur, could depress the market price of our securities and could impair our ability to raise capital through the sale of additional equity securities. A substantial number of our shares are now generally freely tradable, subject, in the case of sales by our affiliates, to the volume limitations and other provisions of Rule 144 under the Securities Act. If holders of these shares sell, or indicate an intent to sell, substantial amounts of our securities in the public market, the trading price of our securities could decline significantly.

In addition, in connection with the completion of our global offering in March 2018, we entered into a registration rights agreement with entities affiliated with Baker Bros. Advisors LP, or Baker Brothers, pursuant to which Baker Brothers is entitled to rights with respect to the registration under the Securities Act of ordinary shares and ADSs, including ordinary shares or ADSs issuable upon the exercise or conversion of any other securities (whether equity, debt or otherwise) owned or subsequently acquired by Baker Brothers. Ordinary shares or ADSs sold under such registration statements can be freely sold in the public market. In the event such registration rights are exercised and a large number of ordinary shares or ADSs are sold in the public market, such sales could reduce the trading price of our ordinary shares or ADSs. Further, filing of such registration statements could reduce the trading price of our ordinary shares or ADSs regardless of whether any securities are sold thereunder. See “Description of Share Capital—Registration Rights” for a more detailed description of these registration rights.

We have also filed a registration statement with the SEC to register the ordinary shares that may be issued under our equity incentive plans. The ordinary shares subject to outstanding options under our equity incentive plans, ordinary shares reserved for future issuance under our equity incentive plans and ordinary shares subject to outstanding warrants will become eligible for sale in the public market in the future, subject to certain legal and contractual limitations. Sales of a large number of the shares issued under these plans in the public market could have an adverse effect on the market price of our securities.

You May Not Be Able Enforce Civil Liabilities Against Us If Certain Conditions Are Not Met.

We are incorporated in France, but a majority of our outstanding securities are owned by U.S. residents. A number of our officers and directors as well as our subsidiaries arenon-residents of the United States, and all or a substantial portion of the assets of such persons are located outside the United States. As a result, you may not be able to effect service of process within the United States upon suchnon-U.S. persons or to enforce judgments outside the United States against them, including judgments obtained in U.S. courts predicated upon the civil liability provisions of the federal securities laws of the United States. We have been advised by our French counsel that the enforceability in France in original actions, or in actions for enforcement of judgments of U.S. courts, of civil liabilities to the extent predicated upon the federal securities laws of the United States would be subject to conditions as described under “Enforcement of Civil Liabilities.”

In addition, awards of punitive damages in actions brought in the United States or elsewhere may be unenforceable in France. An award for monetary damages under the U.S. securities laws would be considered punitive if it does not seek to compensate the claimant for loss or damage suffered but is intended to punish the defendant. French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek indemnification from the directors of a corporation in the corporation’s interest if it fails to bring such legal action itself. If so, any damages awarded by the court are paid to the corporation and legal fees relating to such action may be borne by the relevant shareholder or the group of shareholders.

The enforceability of any judgment in France will depend on the particular facts of the case as well as the laws and treaties in effect at the time. The United States and France do not currently have a treaty providing for recognition and enforcement of judgments (other than arbitration awards) in civil and commercial matters.

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The Dual Listing Of Our Ordinary Shares And The ADSs May Adversely Affect The Liquidity And Value Of The ADSs.

The ADSs are traded on the Nasdaq Global Select Market, and our ordinary shares are listed on Euronext Paris. The dual listing of our ordinary shares and the ADSs may dilute the liquidity of these securities in one or both markets and may adversely affect the maintenance of an active trading market for the ADSs in the United States. The price of the ADSs could also be adversely affected by trading in our ordinary shares on Euronext Paris, and vice versa. In addition, currency fluctuations as between the euro and U.S. dollar may have an adverse impact on the value of our ADSs.

U.S. Holders Of ADSs May Suffer Adverse Tax Consequences If We Are Characterized As A Passive Foreign Investment Company.

Under the U.S. Internal Revenue Code of 1986, as amended, or Code, we will be a passive foreign investment company, or PFIC, for any taxable year in which, after the application of certain “look-through” rules with respect to subsidiaries, either (i) 75% or more of our gross income consists of “passive income,” or (ii) 50% or more of the average quarterly value of our assets, including cash, consists of assets that produce, or are held for the production of, “passive income.” Passive income generally includes interest, dividends, rents, certainnon-active royalties and capital gains. Whether we will be a PFIC in any year depends on the composition of our income and assets, and the relative fair market value of our assets from time to time, which we expect may vary substantially over time. Based on the composition of our gross income and gross assets for our 2018 taxable year, the latter determined by reference to the value of the ADSs and shares, we should not be treated as a PFIC for the taxable year ending December 31, 2018, and we do not expect to be classified as a PFIC for the taxable year ending December 31, 2019. However, there can be no assurance that we have not been or will not be a PFIC for the current taxable year or any future taxable year.

If we are a PFIC for any taxable year during which a U.S. Holder (as defined below) holds ADSs, a U.S. Holder may be subject to adverse tax consequences if amark-to-market election or a qualified electing fund, or QEF, election has not been made with respect to its ADSs. A U.S. Holder may incur significant additional U.S. federal income taxes on income resulting from certain distributions on, or any gain from the disposition of, such ADSs, as such income generally would be allocated over the U.S. Holder’s holding period for its ADSs. The amount allocated to the current taxable year (i.e., the year in which the distribution occurs or the gain is recognized) and any year prior to the first taxable year in which we are a PFIC would be subject to tax as ordinary income earned in the current year, and all other amounts would be subject to tax at the highest rates of U.S. federal income taxation in effect for such years, with an interest charge then imposed on the resulting taxes in respect of such income. Furthermore, if we are a PFIC for any taxable year during which the U.S. Holder holds ADSs, dividends paid by us would not be eligible for preferential individual rates of U.S. federal income tax. In addition, U.S. Holders that own an interest in a PFIC are required to comply with certain reporting requirements.

A U.S. Holder may in certain circumstances mitigate the adverse tax consequences of the PFIC rules by filing an election to treat the PFIC as a QEF, or, if shares of the PFIC are “marketable stock” for purposes of the PFIC rules, by making amark-to-market election with respect to the shares of the PFIC. See “Material Income Tax Considerations—Certain Material U.S. Federal Income Tax Considerations.”

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OurBy-Laws And French Corporate Law Contain Provisions That May Delay Or Discourage A Takeover Attempt.

Provisions contained in ourby-laws and the corporate laws of France, the country in which we are incorporated, could make it more difficult for a third-party to acquire us, even if doing so might be beneficial to our shareholders. In addition, provisions of ourby-laws impose various procedural and other requirements, which could make it more difficult for shareholders to effect certain corporate actions. These provisions include the following:

• under French law, anon-French resident as well as any French entity controlled bynon-French residents may have to file a declaration for statistical purposes with theBanque de France, within 20 working days following the date of certain direct foreign investments in us, including any purchase of our ADSs. In particular, such filings are required in connection with investments exceeding €15,000,000 that lead to the acquisition of at least 10% of our share capital or voting rights or cross such 10% threshold;

• under French law, certain investments in a French company relating to certain strategic industries by individuals or entities not residents in a Member State of the EU are subject to prior authorization of the Ministry of Economy;

• the owner of 90% of the share capital and voting rights of a public company listed on a regulated market in a Member State of the European Union or in a state party to the EEA Agreement, including from the main French Stock Exchange, has the right to force out minority shareholders following a tender offer made to all shareholders;

• a merger (i.e., in a French law context, a share for share exchange following which our company would be dissolved into the acquiring entity and our shareholders would become shareholders of the acquiring entity) of our company into a company incorporated in the European Union would require the approval of our board of directors as well as atwo-thirds majority of the votes held by the shareholders present, represented by proxy or voting by mail at the relevant meeting;

• under French law, a cash merger is treated as a share purchase and would require the consent of each participating shareholder;

• our shareholders have granted and may grant in the future our board of directors broad authorizations to increase our share capital or to issue additional ordinary shares or other securities (for example, warrants) to our shareholders, the public or qualified investors, including as a possible defense following the launching of a tender offer for our shares;

• our shareholders have preferential subscription rights on a pro rata basis on the issuance by us of any additional securities for cash or aset-off of cash debts, which rights may only be waived by the extraordinary general meeting (by atwo-thirds majority vote) of our shareholders or on an individual basis by each shareholder;

• our board of directors has the right to appoint directors to fill a vacancy created by the resignation or death of a director, subject to the approval by the shareholders of such appointment at the next shareholders’ meeting, which prevents shareholders from having the sole right to fill vacancies on our board of directors;

• our board of directors can only be convened by our chairman or our managing director, if any, or, when no board meeting has been held for more than two consecutive months, by directors representing at leastone-third of the total number of directors;

• our board of directors meetings can only be regularly held if at least half of the directors attend either physically or by way of videoconference or teleconference enabling the directors’ identification and ensuring their effective participation in the board’s decisions; however, this mode of participation (by way of videoconference or teleconference) does not apply to the adoption of decisions taken for the closing of the accounts for the fiscal year, including the consolidated financial statements;

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• our shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice. Shares issued are registered in individual accounts opened by us or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions;

• approval of at least a majority of the votes held by shareholders present, represented by a proxy, or voting by mail at the relevant ordinary shareholders’ general meeting is required to remove directors with or without cause;

• advance notice is required for nominations to the board of directors or for proposing matters to be acted upon at a shareholders’ meeting, except that a vote to remove and replace a director can be proposed at any shareholders’ meeting without notice;

• ourby-laws can be changed in accordance with applicable laws;

• the crossing of certain thresholds has to be disclosed and can impose certain obligations; see the section of our Annual Report on Form20-F for the year ended December 31, 2018 titled “Item 10.B—Memorandum and Articles of Association”;

• transfers of shares shall comply with applicable insider trading rules and regulations and in particular with the Market Abuse Directive and Regulation dated April 16, 2014; and

• pursuant to French law, the sections of theby-laws relating to the number of directors and election and removal of a director from office may only be modified by a resolution adopted by at least a two thirds majority vote of our shareholders present, represented by a proxy or voting by mail at the meeting.

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MARKET INFORMATION

Our ADSs have been listed on the Nasdaq Global Select Market under the symbol “DBVT” since October 22, 2014. Prior to that date, there was no public trading market for our ADSs. Our ordinary shares have been trading on Euronext Paris under the symbol “DBV” since March 28, 2012. Prior to that date, there was no public trading market for our ordinary shares. On January 28, 2020, the last reported sale price of the ADSs on the Nasdaq Global Select Market was $11.20 per ADS, and the last reported closing price of the ordinary shares on Euronext Paris was €20.40 per share.

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USE OF PROCEEDS

We estimate that we will receive net proceeds from this global offering of approximately $         (€        ) million, based on a public offering price of $         per ADS in the U.S. offering and €         per ordinary share in the European offering, after deducting underwriting commissions and estimated offering expenses payable by us. If the underwriters exercise in full their option to purchase additional ordinary shares (which may be in the form of ADSs), we estimate that we will receive net proceeds from the global offering of approximately $         (€        ) million, based on a public offering price of $         per ADS in the U.S. offering and €         per ordinary share in the European offering, after deducting underwriting commissions and estimated offering expenses payable by us.

We currently intend to use the net proceeds from this offering, together with our existing cash and cash equivalents, primarily to prepare for the commercialization of Viaskin Peanut, including marketing efforts related to launch in the second half of 2020, if approved, as well as to advance the discovery and development of the Company’s product candidates using its Viaskin Platform and for working capital and general corporate purposes.

Based on our current operations, plans and assumptions, we expect the net proceeds from this offering, combined with our current operating capital, to fund our operations                     .

To date, we have not generated any product revenue and we continue to prepare for the potential launch of our Viaskin Peanut product candidate in the United States in the second half of 2020, if approved. In October 2019, we announced the FDA’s acceptance for review of our Biologics License Application for Viaskin Peanut, with a target action date, provided by the FDA, of August 5, 2020.

We expect operating losses to continue for the foreseeable future. Current cash and cash equivalents are not projected to be sufficient to support our operating plan for the next 12 months. We believe that our existing cash and cash equivalents will be sufficient to fund our operations through the third quarter of 2020. We expect that we will need to raise additional capital in the future as we commercialize Viaskin Peanut, if approved, and continue to discover and develop other product candidates using our Viaskin Platform. We may finance our future cash needs through a combination of equity offerings, debt financings and potential collaborations, and license and development agreements.

This expected use of the net proceeds from this offering represents our intentions based upon our current plans and business conditions. As of the date of this prospectus supplement, we cannot predict with certainty all of the particular uses for the net proceeds to be received upon the completion of this offering or the amounts that we will actually spend on the uses set forth above. The amounts and timing of our actual expenditures and the extent of clinical development may vary significantly depending on numerous factors, including the progress of our development efforts, the status of and results frompre-clinical studies and any ongoing clinical trials or clinical trials we may commence in the future, as well as any collaborations that we may enter into with third parties for our product candidates and any unforeseen cash needs. As a result, our management will retain broad discretion over the allocation of the net proceeds from this offering.

Pending our use of the net proceeds from this offering, we intend to invest the net proceeds in a variety of capital preservation investments, including short-term, investment-grade, interest-bearing instruments.

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CAPITALIZATION

The following table sets forth our cash and cash equivalents and capitalization as of September 30, 2019 on:

• an actual basis; and

• an as adjusted basis to reflect: (1) our issuance and sale of (a)                ordinary shares in the European offering at a public offering price of €         per ordinary share and (b)                ADSs in the U.S. offering at a public offering price of $         per ADS, after deducting underwriting commissions and estimated offering expenses payable by us; and (2) the application of our net proceeds of this offering as described under the section of this prospectus supplement titled “Use of Proceeds.”

You should read this table in conjunction with other sections of this prospectus supplement, the accompanying prospectus and any documents that they incorporate by reference, including our consolidated financial statements and the related notes.

	As of September 30, 2019
	Actual			As Adjusted(1)
	(in thousands)
Cash and cash equivalents	€	73,010		€
Conditional advances		1,437
Lease debt		23,789
Share capital:
Ordinary shares, €0.10 nominal value: 36,157,777 shares issued and outstanding, actual; shares issued and outstanding, as adjusted		3,616
Premiums related to the share capital		605,079
Reserves		(411,590	)
Net loss		(111,264	)
Total equity attributable to our shareholders		85,841
Total capitalization	€	111,067		€

(1) Assumes an exchange rate of $         per euro.

The number of ordinary shares that will be outstanding after the global offering is based on 36,157,777 ordinary shares outstanding as of September 30, 2019 and excludes the following:

• 4,133,638 ordinary shares issuable upon the exercise of share options, free shares (actions gratuites) and warrants (including employee warrants (BSPCE)) issued pursuant to our share option plans and other delegations of authority from our shareholders at a weighted average exercise price of €31.26 per share (excluding 623,545 ordinary shares issuable upon the vesting of outstanding free shares that may be issued for free with no exercise price being paid); and

• 2,922,426 ordinary shares reserved for future issuance under share option plans and other delegations of authority from our shareholders.

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DILUTION

If you invest in the ordinary shares or ADSs in this global offering, your ownership interest will be immediately diluted to the extent of the difference between the public offering price per ordinary share or ADS paid by purchasers in the global offering and our as adjusted net tangible book value per ordinary share after this offering. Our net tangible book value as of September 30, 2019 was €85.8 million ($93.6 million), or €2.37 ($2.59) per ordinary share. Net tangible book value per ordinary share is determined by dividing (1) our total assets less our intangible assets and our total liabilities by (2) the number of ordinary shares outstanding as of September 30, 2019, or 36,157,777 ordinary shares (including ordinary shares represented by ADSs).

After giving effect to the sale of ordinary shares (which may be in the form of ADSs) in this global offering at a public offering price of €                 per ordinary share, and after deducting the underwriting commissions and estimated offering expenses payable by our, our as adjusted net tangible book value at September 30, 2019 would have been approximately €                million, or €                 per ordinary share. This represents an immediate increase in as adjusted net tangible book value of €                per ordinary share to existing shareholders and immediate dilution of €                 per ordinary share to new investors. The following table illustrates this dilution on a per share basis:

Public offering price per share			€
Historical net tangible book value per share as of September 30, 2019	€	2.37
Increase in net tangible book value per share attributable to new investors participating in this global offering
As adjusted net tangible book value per share after this offering
Dilution per share to new investors participating in this offering			€

If the underwriters exercise their option to purchase additional ordinary shares (which may be in the form of ADSs) in full, the as adjusted net tangible book value per ordinary share after the global offering would be €                 , the increase in the as adjusted net tangible book value to existing shareholders would be €                 per ordinary share, and the dilution to new investors participating in this offering would be €                 per ordinary share.

The tables and calculations above are based on 36,157,777 ordinary shares outstanding as of September 30, 2019 and exclude the following:

• 4,133,638 ordinary shares issuable upon the exercise of share options, free shares (actions gratuites) and warrants (including employee warrants (BSPCE)) issued pursuant to our share option plans and other delegations of authority from our shareholders at a weighted average exercise price of €31.26 per share (excluding 623,545 ordinary shares issuable upon the vesting of outstanding free shares that may be issued for free with no exercise price being paid); and

• 2,922,426 ordinary shares reserved for future issuance under share option plans and other delegations of authority from our shareholders.

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DESCRIPTION OF SHARE CAPITAL

The following description of our share capital summarizes certain provisions of ourby-laws. Such summaries do not purport to be complete and are subject to, and are qualified in their entirety by reference to, all of the provisions of ourby-laws, a copy of which is incorporated by reference into the registration statement of which this prospectus supplement forms a part.

General

As of December 31, 2019, our outstanding share capital consisted of a total of 47,028,510 issued ordinary shares, fully paid and with a nominal value €0.10 per share. We have no preferred shares outstanding.

Under French law, ourby-laws set forth only our issued and outstanding share capital as of the date of theby-laws. Our fully diluted share capital represents all issued and outstanding shares, as well as all potential shares which may be issued upon exercise of outstanding employee warrants, employee share options andnon-employee warrants, as approved by our shareholders and granted by our board of directors.

Reconciliation of the Number of Ordinary Shares Outstanding through December 31, 2019

Shares outstanding at December 31, 2017	24,990,822
Number of shares issued in connection with March 2018 Global offering	4,056,914
Number of ordinary shares issued in connection with the exercise of employee warrants, share options andnon-employee warrants and the acquisition of free shares	1,110,041
Shares outstanding at December 31, 2018	30,157,777
Number of shares issued in connection with April 2019 Global offering	6,000,000
Number of shares issued in connection with October 2019 Global offering	10,852,733
Number of ordinary shares issued in connection with the exercise of employee warrants, share options andnon-employee warrants and the acquisition of free shares	18,000
Shares outstanding at December 31, 2019	47,028,510

Shareholder Authorizations Regarding Share Capital

At our 2019 combined shareholders’ meeting held on May 24, 2019, our board of directors received the following authorizations from shareholders:

• authorization tobuy-back up to 5% of our shares (such authorization being capped to a maximum potential dilution equal to 5% of our share capital at the date of the relevantbuy-back) for a duration of 18 months (of which 9,000 shares have been bought back as of December 31, 2019);

• authorization to cancel the shares bought back by the company up to 5% of our shares (such authorization being capped to a maximum of 5% of our share capital at the date of the relevant cancellation decision) and to decrease our share capital accordingly, for a duration of 24 months (of which no shares have been canceled as of December 31, 2019);

• delegation of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company), with preferential subscription rights, for a duration of 26 months within a maximum aggregate potential dilution of 18,811,404 shares based on the ordinary shares outstanding at December 31, 2019 (such delegation of authority being capped to a maximum potential dilution of 40% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of December 31, 2019);

• delegations of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company), without preferential subscription rights (except for the rights offering), through public offerings and/or offerings under Article L.411-2. 1° of the French Monetary and Financial Code for the maximum

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duration permitted under French law (26 months) within a maximum aggregate potential dilution of 14,108,553 or 9,405,702 (depending on the delegations) shares based on the ordinary shares outstanding at December 31, 2019 (each delegation of authority has been capped to a maximum potential dilution equal to a percentage of 30% or 20% of our share capital, respectively (depending on the delegations) at the date of the relevant share capital increase) (of which no shares have been issued as of December 31, 2019), it being specified that any increases of our share capital under these delegations of authority (public offerings and/or offerings under Article L. 411-2. 1° of the French Monetary and Financial Code) together with any increases of our share capital under the delegation of authority mentioned in the following paragraph (authority to increase our share capital to the benefit of persons meeting certain characteristics) have been granted within a maximum potential dilution of 23,502,555 shares based on the ordinary shares outstanding at the date of the shareholders’ meeting (these delegations of authority being capped to a percentage of 65% of our share capital at the date of the shareholders’ meeting) (of which 10,852,733 shares have been issued as of December 31, 2019);

• delegation of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company) without preferential subscription rights, to the benefit of categories of persons meeting certain characteristics, for a duration of 18 months within a maximum potential dilution of 14,108,553 shares based on the ordinary shares outstanding at December 31, 2019 (such delegation of authority being capped to a maximum potential dilution of 30% of our share capital at the date of the relevant share capital increase) (of which 10,852,733 shares have been issued as of December 31, 2019), it being specified that any increases of our share capital under this delegation of authority (authority to increase our share capital to the benefit of persons meeting certain characteristics) together with any increases of our share capital under the delegation of authority mentioned in the previous paragraph (authority to increase our share capital through public offerings and/or offerings under Article L. 411-2. 1° of the French Monetary and Financial Code) have been granted within a maximum potential dilution of 23,502,555 shares based on the ordinary shares outstanding at the date of the shareholders’ meeting (these delegations of authority being capped to a percentage of 65% of our share capital at the date of the shareholders’ meeting) (of which 10,852,733 shares have been issued as of December 31, 2019);

• delegation of authority to issue equity warrants (bons de souscription d’actions, bons de souscription et/ou d’acquisition d’actions nouvelles et/ou existantes) or redeemable equity warrants (bons de souscription et/ou d’acquisition d’actions nouvelles et/ou existantes remboursables) without preferential subscription rights, to the benefit of categories of persons meeting certain characteristics for a maximum duration of 18 months, within a maximum potential dilution of 180,788 shares based on the ordinary shares outstanding at May 24, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 0.5% of our share capital on the date of the shareholders’ meeting) (of which no warrants have been issued as of December 31, 2019, for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such issuances);

• delegation of authority to increase our share capital by issuing ordinary shares and/or securities giving access to our share capital without preferential subscription rights, to the benefit of employees investing in our company saving plan (plan d’épargne entreprise), for a duration of 26 months, within a maximum aggregate potential dilution of 940,570 shares based on the ordinary shares outstanding at December 31, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 2% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of December 31, 2019, for which such delegation our shareholders automatically waived their preferential subscription rights with respect to all such issuances);

• authorization to grant free shares (attribution gratuite d’actions) to our employees and/or certain officers until the next general meeting approving the annual accounts to be held in 2020, within a maximum potential dilution of shares based on the ordinary shares outstanding at May 24, 2019 (such authorization being capped to a 723,155 maximum potential dilution equal to 2% of our share capital at the date of the shareholders’ meeting) (of which 87,350 free shares have been granted but no shares

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have been issued as of December 31, 2019, for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such grants); and

• authorization to grant share options (options de souscription et/ou d’achat d’actions) to our employees and/or certain officers for a maximum duration of 18 months, within a maximum potential dilution of 2,711,833 shares based on the ordinary shares outstanding at May 24, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 7.5% of our share capital at the date of the shareholders’ meeting) (of which 726,200 options have been granted but no shares have been issued as of December 31, 2019 for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such grants).

Furthermore, our board of directors received the following delegations from the shareholders at our combined shareholders’ meeting held on June 22, 2018:

• delegation of authority to increase our share capital by incorporation of reserves, profits or premium either by the issuance of new shares attributed to each existing shareholder or by the increase of the nominal value per share for a duration of 26 months within a maximum aggregate potential dilution of 23,514,255 shares based on the ordinary shares outstanding at December 31, 2019 (such delegation of authority being capped to a maximum potential dilution of 50% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of December 31, 2019); and

• delegation of authority to increase our share capital by issuing securities in view of remuneration of contributions in kind (shares and/or securities giving access to the share capital) to our company for a duration of 26 months within a maximum potential dilution of 3,000,635 shares based on the ordinary shares outstanding at June 22, 2018 (such delegation of authority being capped to a maximum potential dilution equal to 10% of our share capital at the date of the shareholders’ meeting), (of which no shares have been issued as of December 31, 2019).

Registration Rights

In connection with the completion of our global offering in March 2018, we entered into a registration rights agreement, or the Registration Rights Agreement, with entities affiliated with Baker Bros. Advisors LP, or Baker Brothers, pursuant to which Baker Brothers is entitled to rights with respect to the registration under the Securities Act of ordinary shares and ADSs, including ordinary shares or ADSs issuable upon the exercise or conversion of any other securities (whether equity, debt or otherwise) owned or subsequently acquired by Baker Brothers. These rights include demand registration rights and piggyback registration rights. All fees, costs and expenses of underwritten registrations will be borne by us and all selling expenses, including underwriting commissions, will be borne by Baker Brothers. Under the terms of the Registration Rights Agreement, we are required, upon the request of Baker Brothers, to file a registration statement covering, and use our reasonable best efforts to effect the registration of the ordinary shares, including in the form of ADSs, requested to be registered for public resale. In addition, if we register our securities either for our own account or for the account of other security holders under certain circumstances more than six months following the completion of the March 2018 global offering, Baker Brothers is entitled to include its ordinary shares or ADSs in such registration. Subject to certain exceptions, we and the underwriters may limit the number of ordinary shares or ADSs included in an underwritten offering conducted pursuant to the terms of the Registration Rights Agreement if the underwriters believe that including such securities would adversely affect the offering. The registration rights granted under the Registration Rights Agreement will terminate ten years following the completion of this offering.

Listing

Our ADSs are listed on the Nasdaq Global Select Market under the symbol “DBVT” and our ordinary shares are listed on Euronext Paris under the symbol “DBV.”

Transfer Agent and Registrar

The transfer agent and registrar for our ADSs is Citibank, N.A. The transfer agent and registrar for our ordinary shares is Société Générale Securities Services.

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DESCRIPTION OF AMERICAN DEPOSITARY SHARES

Citibank, N.A. has agreed to act as the depositary for the American Depositary Shares. Citibank’s depositary offices are located at 388 Greenwich Street, New York, New York 10013. American Depositary Shares are frequently referred to as ADSs and represent ownership interests in securities that are on deposit with the depositary. ADSs may be represented by certificates that are commonly known as American Depositary Receipts, or ADRs. The depositary typically appoints a custodian to safekeep the securities on deposit. In this case, the custodian is Citibank International Plc, located at EGSP 186, 1 North Wall Quay, Dublin 1 Ireland.

We have appointed Citibank as depositary pursuant to a deposit agreement. A copy of the deposit agreement is on file with the SEC under cover of a Registration Statement on FormF-6. You may obtain a copy of the deposit agreement from the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549 and from the SEC’s website at www.sec.gov. Please refer to Registration Number333-199231 when retrieving such copy.

We are providing you with a summary description of the material terms of the ADSs and of your material rights as an owner of ADSs. Please remember that summaries by their nature lack the precision of the information summarized and that the rights and obligations of an owner of ADSs will be determined by reference to the terms of the deposit agreement and not by this summary. We urge you to review the deposit agreement in its entirety. The portions of this summary description that are italicized describe matters that may be relevant to the ownership of ADSs but that may not be contained in the deposit agreement.

Each ADS represents the right to receiveone-half (1/2) of one ordinary share on deposit with the custodian. An ADS also represents the right to receive any other property received by the depositary or the custodian on behalf of the owner of the ADS but that has not been distributed to the owners of ADSs because of legal restrictions or practical considerations. The custodian, the depositary and their respective nominees will hold all deposited property for the benefit of the holders and beneficial owners of ADSs. The deposited property does not constitute the proprietary assets of the depositary, the custodian or their nominees. Beneficial ownership in the deposited property will under the terms of the deposit agreement be vested in the beneficial owners of the ADSs. The depositary, the custodian and their respective nominees will be the record holders of the deposited property represented by the ADSs for the benefit of the holders and beneficial owners of the corresponding ADSs. Owners of ADSs will be able to exercise beneficial ownership interests in the deposited property only through the registered holders of the ADSs, by the registered holders of the ADSs (on behalf of the applicable ADS owners) only through the depositary, and by the depositary (on behalf of the owners of the corresponding ADSs) directly, or indirectly through the custodian or their respective nominees, in each case upon the terms of the deposit agreement.

If you become an owner of ADSs, you will become a party to the deposit agreement and therefore will be bound to its terms and to the terms of any ADR that represents your ADSs. The deposit agreement and the ADR specify our rights and obligations as well as your rights and obligations as owner of ADSs and those of the depositary. As an ADS holder you appoint the depositary to act on your behalf in certain circumstances. The deposit agreement and the ADRs are governed by New York law. However, our obligations to the holders of ordinary shares will continue to be governed by the laws of France, which may be different from the laws in the United States.

In addition, applicable laws and regulations may require you to satisfy reporting requirements and obtain regulatory approvals in certain circumstances. You are solely responsible for complying with such reporting requirements and obtaining such approvals. Neither the depositary, the custodian, us or any of their or our respective agents or affiliates shall be required to take any actions whatsoever on your behalf to satisfy such reporting requirements or obtain such regulatory approvals under applicable laws and regulations.

As an owner of ADSs, we will not treat you as one of our shareholders and you will not have direct shareholder rights. The depositary will hold on your behalf the shareholder rights attached to the ordinary shares underlying

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your ADSs. As an owner of ADSs you will be able to exercise the shareholders rights for the ordinary shares represented by your ADSs through the depositary only to the extent contemplated in the deposit agreement. To exercise any shareholder rights not contemplated in the deposit agreement you will, as an ADS owner, need to arrange for the cancellation of your ADSs and become a direct shareholder.

As an owner of ADSs, you may hold your ADSs either by means of an ADR registered in your name, through a brokerage or safekeeping account, or through an account established by the depositary in your name reflecting the registration of uncertificated ADSs directly on the books of the depositary, commonly referred to as the direct registration system, or DRS. The direct registration system reflects the uncertificated (book-entry) registration of ownership of ADSs by the depositary. Under the direct registration system, ownership of ADSs is evidenced by periodic statements issued by the depositary to the holders of the ADSs. The direct registration system includes automated transfers between the depositary and The Depository Trust Company, or DTC, the central book-entry clearing and settlement system for equity securities in the United States. If you decide to hold your ADSs through your brokerage or safekeeping account, you must rely on the procedures of your broker or bank to assert your rights as ADS owner. Banks and brokers typically hold securities such as the ADSs through clearing and settlement systems such as DTC. The procedures of such clearing and settlement systems may limit your ability to exercise your rights as an owner of ADSs. Please consult with your broker or bank if you have any questions concerning these limitations and procedures. All ADSs held through DTC will be registered in the name of a nominee of DTC. This summary description assumes you have opted to own the ADSs directly by means of an ADS registered in your name and, as such, we will refer to you as the “holder.” When we refer to “you,” we assume the reader owns ADSs and will own ADSs at the relevant time.

Dividends and Distributions

As a holder of ADSs, you generally have the right to receive the distributions we make on the securities deposited with the custodian. Your receipt of these distributions may be limited, however, by practical considerations and legal limitations. Holders of ADSs will receive such distributions under the terms of the deposit agreement in proportion to the number of ADSs held as of a specified record date, after deduction the applicable fees, taxes and expenses.

Distributions of Cash

Whenever we make a cash distribution for the securities on deposit with the custodian, we will deposit the funds with the custodian. Upon receipt of confirmation of the deposit of the requisite funds, the depositary will arrange for the funds to be converted into U.S. dollars and for the distribution of the U.S. dollars to the holders, subject to French laws and regulations.

The conversion into U.S. dollars will take place only if practicable and if the U.S. dollars are transferable to the United States. The depositary will apply the same method for distributing the proceeds of the sale of any property (such as undistributed rights) held by the custodian in respect of securities on deposit.

The distribution of cash will be made net of the fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. The depositary will hold any cash amounts it is unable to distribute in anon-interest bearing account for the benefit of the applicable holders and beneficial owners of ADSs until the distribution can be effected or the funds that the depositary holds must be escheated as unclaimed property in accordance with the laws of the relevant states of the United States.

Distributions of Shares

Whenever we make a free distribution of ordinary shares for the securities on deposit with the custodian, we will deposit the applicable number of ordinary shares with the custodian. Upon receipt of confirmation of such deposit, the depositary will either distribute to holders new ADSs representing the ordinary shares deposited or

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modify theADS-to-ordinary share ratio, in which case each ADS you hold will represent rights and interests in the additional ordinary shares so deposited. Only whole new ADSs will be distributed. Fractional entitlements will be sold and the proceeds of such sale will be distributed as in the case of a cash distribution.

The distribution of new ADSs or the modification of theADS-to-ordinary share ratio upon a distribution of ordinary shares will be made net of the fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. In order to pay such taxes or governmental charges, the depositary may sell all or a portion of the new ordinary shares so distributed.

No such distribution of new ADSs will be made if it would violate a law (i.e., the U.S. securities laws) or if it is not operationally practicable. If the depositary does not distribute new ADSs as described above, it may sell the ordinary shares received upon the terms described in the deposit agreement and will distribute the proceeds of the sale as in the case of a distribution of cash.

Distributions of Rights

Whenever we intend to distribute rights to purchase additional ordinary shares, we will give prior notice to the depositary and we will assist the depositary in determining whether it is lawful and reasonably practicable to distribute rights to purchase additional ADSs to holders.

The depositary will establish procedures to distribute rights to purchase additional ADSs to holders and to enable such holders to exercise such rights if it is lawful and reasonably practicable to make the rights available to holders of ADSs, and if we provide all of the documentation contemplated in the deposit agreement (such as opinions to address the lawfulness of the transaction). You may have to pay fees, expenses, taxes and other governmental charges to subscribe for the new ADSs upon the exercise of your rights. The depositary is not obligated to establish procedures to facilitate the distribution and exercise by holders of rights to purchase new ordinary shares other than in the form of ADSs.

The depositary will not distribute the rights to you if:

• we do not timely request that the rights be distributed to you or we request that the rights not be distributed to you; or

• we fail to deliver satisfactory documents to the depositary; or

• it is not reasonably practicable to distribute the rights.

The depositary will sell the rights that are not exercised or not distributed if such sale is lawful and reasonably practicable. The proceeds of such sale will be distributed to holders as in the case of a cash distribution. If the depositary is unable to sell the rights, it will allow the rights to lapse.

Elective Distributions

Whenever we intend to distribute a dividend payable at the election of shareholders either in cash or in additional shares, we will give prior notice thereof to the depositary and will indicate whether we wish the elective distribution to be made available to you. In such case, we will assist the depositary in determining whether such distribution is lawful and reasonably practicable.

The depositary will make the election available to you only if it is reasonably practicable and if we have provided all of the documentation contemplated in the deposit agreement. In such case, the depositary will establish procedures to enable you to elect to receive either cash or additional ADSs, in each case as described in the deposit agreement.

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If the election is not made available to you, you will receive either cash or additional ADSs, depending on what a shareholder in France would receive upon failing to make an election, as more fully described in the deposit agreement.

Other Distributions

Whenever we intend to distribute property other than cash, ordinary shares or rights to purchase additional ordinary shares, we will notify the depositary in advance and will indicate whether we wish such distribution to be made to you. If so, we will assist the depositary in determining whether such distribution to holders is lawful and reasonably practicable.

If it is reasonably practicable to distribute such property to you and if we provide all of the documentation contemplated in the deposit agreement, the depositary will distribute the property to the holders in a manner it deems practicable.

The distribution will be made net of fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. In order to pay such taxes and governmental charges, the depositary may sell all or a portion of the property received.

The depositary will not distribute the property to you and will sell the property if:

• we do not request that the property be distributed to you or if we ask that the property not be distributed to you; or

• we do not deliver satisfactory documents to the depositary; or

• the depositary determines that all or a portion of the distribution to you is not reasonably practicable.

The proceeds of such a sale will be distributed to holders as in the case of a cash distribution.

Redemption

Whenever we decide to redeem any of the securities on deposit with the custodian, we will notify the depositary in advance. If it is practicable and if we provide all of the documentation contemplated in the deposit agreement, the depositary will provide notice of the redemption to the holders.

The custodian will be instructed to surrender the shares being redeemed against payment of the applicable redemption price. The depositary will convert the redemption funds received into U.S. dollars upon the terms of the deposit agreement and will establish procedures to enable holders to receive the net proceeds from the redemption upon surrender of their ADSs to the depositary. You may have to pay fees, expenses, taxes and other governmental charges upon the redemption of your ADSs. If less than all ADSs are being redeemed, the ADSs to be retired will be selected by lot or on a pro rata basis, as the depositary may determine.

Changes Affecting Ordinary Shares

The ordinary shares held on deposit for your ADSs may change from time to time. For example, there may be a change in nominal or par value, asplit-up, cancellation, consolidation or reclassification of such ordinary shares or a recapitalization, reorganization, merger, consolidation or sale of assets.

If any such change were to occur, your ADSs would, to the extent permitted by law, represent the right to receive the property received or exchanged in respect of the ordinary shares held on deposit. The depositary may in such circumstances deliver new ADSs to you, amend the deposit agreement, the ADRs and the applicable Registration Statement(s) on FormF-6, call for the exchange of your existing ADSs for new ADSs and take any other actions

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that are appropriate to reflect as to the ADSs the change affecting the shares. If the depositary may not lawfully distribute such property to you, the depositary may sell such property and distribute the net proceeds to you as in the case of a cash distribution.

Issuance of ADSs upon Deposit of Ordinary Shares

Upon completion of this offering, the ordinary shares being offered pursuant to this prospectus will be deposited by us with the custodian. Upon receipt of confirmation of such deposit, the depositary will issue ADSs to the underwriters named in this prospectus supplement.

After the closing of this offering, the depositary may create ADSs on your behalf if you or your broker deposit ordinary shares with the custodian. The depositary will deliver these ADSs to the person you indicate only after you pay any applicable issuance fees and any charges and taxes payable for the transfer of the ordinary shares to the custodian. Your ability to deposit ordinary shares and receive ADSs may be limited by U.S. and French legal considerations applicable at the time of deposit.

The issuance of ADSs may be delayed until the depositary or the custodian receives confirmation that all required approvals have been given and that the ordinary shares have been duly transferred to the custodian. The depositary will only issue ADSs in whole numbers.

When you make a deposit of ordinary shares, you will be responsible for transferring good and valid title to the depositary. As such, you will be deemed to represent and warrant that:

• The ordinary shares are duly authorized, validly issued, fully paid,non-assessable and legally obtained.

• All preemptive (and similar) rights, if any, with respect to such ordinary shares have been validly waived or exercised.

• You are duly authorized to deposit the ordinary shares.

• The ordinary shares presented for deposit are free and clear of any lien, encumbrance, security interest, charge, mortgage or adverse claim, and are not, and the ADSs issuable upon such deposit will not be, “restricted securities” (as defined in the deposit agreement).

• The ordinary shares presented for deposit have not been stripped of any rights or entitlements.

If any of the representations or warranties are incorrect in any way, we and the depositary may, at your cost and expense, take any and all actions necessary to correct the consequences of the misrepresentations.

Transfer, Combination and Split Up of ADRs

As an ADR holder, you will be entitled to transfer, combine or split up your ADRs and the ADSs evidenced thereby. For transfers of ADRs, you will have to surrender the ADRs to be transferred to the depositary and also must:

• ensure that the surrendered ADR is properly endorsed or otherwise in proper form for transfer;

• provide such proof of identity and genuineness of signatures as the depositary deems appropriate;

• provide any transfer stamps required by the State of New York or the United States; and

• pay all applicable fees, charges, expenses, taxes and other government charges payable by ADR holders pursuant to the terms of the deposit agreement, upon the transfer of ADRs.

To have your ADRs either combined or split up, you must surrender the ADRs in question to the depositary with your request to have them combined or split up, and you must pay all applicable fees, charges and expenses payable by ADR holders, pursuant to the terms of the deposit agreement, upon a combination or split up of ADRs.

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Withdrawal of Ordinary Shares Upon Cancellation of ADSs

As a holder, you will be entitled to present your ADSs to the depositary for cancellation and then receive the corresponding number of underlying ordinary shares at the custodian’s offices. Your ability to withdraw the ordinary shares may be limited by U.S. and French legal considerations applicable at the time of withdrawal. In order to withdraw the ordinary shares represented by your ADSs, you will be required to pay to the depositary the fees for cancellation of ADSs and any charges and taxes payable upon the transfer of the ordinary shares being withdrawn. You assume the risk for delivery of all funds and securities upon withdrawal. Once canceled, the ADSs will not have any rights under the deposit agreement.

If you hold ADSs registered in your name, the depositary may ask you to provide proof of identity and genuineness of any signature and such other documents as the depositary may deem appropriate before it will cancel your ADSs. The withdrawal of the ordinary shares represented by your ADSs may be delayed until the depositary receives satisfactory evidence of compliance with all applicable laws and regulations. Please keep in mind that the depositary will only accept ADSs for cancellation that represent a whole number of securities on deposit.

You will have the right to withdraw the securities represented by your ADSs at any time except for:

• temporary delays that may arise because (i) the transfer books for the ordinary shares or ADSs are closed, or (ii) ordinary shares are immobilized on account of a shareholders’ meeting or a payment of dividends;

• obligations to pay fees, taxes and similar charges; or

• restrictions imposed because of laws or regulations applicable to ADSs or the withdrawal of securities on deposit.

The deposit agreement may not be modified to impair your right to withdraw the securities represented by your ADSs except to comply with mandatory provisions of law.

Voting Rights

As a holder, you generally have the right under the deposit agreement to instruct the depositary to exercise the voting rights for the ordinary shares represented by your ADSs. The voting rights of holders of ordinary shares are described in the sections of the accompanying prospectus titled “Description of Share Capital” and “Limitations Affecting Shareholders of a French Company.”

At our request, the depositary will distribute to you any notice of shareholders’ meeting received from us together with information explaining how to instruct the depositary to exercise the voting rights of the securities represented by ADSs.

If the depositary timely receives voting instructions from a holder of ADSs, it will endeavor to vote the securities (in person or by proxy) represented by the holder’s ADSs in accordance with such voting instructions.

If the depositary receives voting instructions which fail to specify the manner in which the depositary is to vote the deposited securities, you will be deemed to have instructed the depositary to vote in favor of all resolutions endorsed by our board of directors.

Please note that the ability of the depositary to carry out voting instructions may be limited by practical and legal limitations and the terms of the securities on deposit. We cannot assure you that you will receive voting materials in time to enable you to return voting instructions to the depositary in a timely manner. Securities represented by ADSs for which no timely voting instructions have been received by the depositary will not be voted.

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Fees and Charges

As an ADS holder, you will be required to pay the following service fees to the depositary:

Service	Fees
•  Issuance of ADSs	Up to U.S. $0.05 per ADS issued
•  Cancellation of ADSs	Up to U.S. $0.05 per ADS canceled
•  Distribution of cash dividends or other cash distributions	Up to U.S. $0.05 per ADS held
•  Distribution of ADSs pursuant to stock dividends, free stock distributions or exercise of rights.	Up to U.S. $0.05 per ADS held
•  Distribution of securities other than ADSs or rights to purchase additional ADSs	Up to U.S. $0.05 per ADS held
•  ADS Services	Up to U.S. $0.05 per ADS held on the applicable record date(s) established by the depositary

As an ADS holder you will also be responsible to pay certain fees and expenses incurred by the depositary and certain taxes and governmental charges such as:

• fees for the transfer and registration of ordinary shares charged by the registrar and transfer agent for the ordinary shares in France (i.e., upon deposit and withdrawal of ordinary shares);

• expenses incurred for converting foreign currency into U.S. dollars;

• expenses for cable, telex and fax transmissions and for delivery of securities;

• taxes and duties upon the transfer of securities (i.e., when ordinary shares are deposited or withdrawn from deposit); and

• fees and expenses incurred in connection with the delivery or servicing of ordinary shares on deposit.

Depositary fees payable upon the issuance and cancellation of ADSs are typically paid to the depositary by the brokers (on behalf of their clients) receiving the newly issued ADSs from the depositary and by the brokers (on behalf of their clients) delivering the ADSs to the depositary for cancellation. The brokers in turn charge these fees to their clients. Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary to the holders of record of ADSs as of the applicable ADS record date.

The depositary fees payable for cash distributions are generally deducted from the cash being distributed. In the case of distributions other than cash (i.e., stock dividend, rights), the depositary charges the applicable fee to the ADS record date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or uncertificated in direct registration), the depositary sends invoices to the applicable record date ADS holders. In the case of ADSs held in brokerage and custodian accounts (via DTC), the depositary generally collects its fees through the systems provided by DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to the ADS holder.

CERTAIN OF THE DEPOSITARY FEES AND CHARGES (SUCH AS THE ADS SERVICES FEE) MAY BECOME PAYABLE SHORTLY AFTER THE CLOSING OF THE ADS OFFERING.

Note that the fees and charges you may be required to pay may vary over time and may be changed by us and by the depositary. You will receive prior notice of such changes.

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The depositary may reimburse us for certain expenses incurred by us in respect of the ADR program established pursuant to the deposit agreement, by making available a portion of the depositary fees charged in respect of the ADR program or otherwise, upon such terms and conditions as we and the depositary may agree from time to time.

Amendments and Termination

We may agree with the depositary to modify the deposit agreement at any time without your consent. We undertake to give holders 30 days’ prior notice of any modifications that would materially prejudice any of their substantial rights under the deposit agreement. We will not consider to be materially prejudicial to your substantial rights any modifications or supplements that are reasonably necessary for the ADSs to be registered under the Securities Act or to be eligible for book-entry settlement, in each case without imposing or increasing the fees and charges you are required to pay. In addition, we may not be able to provide you with prior notice of any modifications or supplements that are required to accommodate compliance with applicable provisions of law.

You will be bound by the modifications to the deposit agreement if you continue to hold your ADSs after the modifications to the deposit agreement become effective. The deposit agreement cannot be amended to prevent you from withdrawing the ordinary shares represented by your ADSs (except as permitted by law).

We have the right to direct the depositary to terminate the deposit agreement. Similarly, the depositary may in certain circumstances on its own initiative terminate the deposit agreement. In either case, the depositary must give notice to the holders at least 30 days before termination. Until termination, your rights under the deposit agreement will be unaffected.

After termination, the depositary will continue to collect distributions received (but will not distribute any such property until you request the cancellation of your ADSs) and may sell the securities held on deposit. After the sale, the depositary will hold the proceeds from such sale and any other funds then held for the holders of ADSs in anon-interest bearing account. At that point, the depositary will have no further obligations to holders other than to account for the funds then held for the holders of ADSs still outstanding (after deduction of applicable fees, taxes and expenses).

Books of Depositary

The depositary will maintain ADS holder records at its depositary office. You may inspect such records at such office during regular business hours but solely for the purpose of communicating with other holders in the interest of business matters relating to the ADSs and the deposit agreement.

The depositary will maintain in New York facilities to record and process the issuance, cancellation, combination,split-up and transfer of ADSs. These facilities may be closed from time to time, to the extent not prohibited by law.

Limitations on Obligations and Liabilities

The deposit agreement limits our obligations and the depositary’s obligations to you. Please note the following:

• We and the depositary are obligated only to take the actions specifically stated in the deposit agreement without negligence or bad faith.

• The depositary disclaims any liability for any failure to carry out voting instructions, for any manner in which a vote is cast or for the effect of any vote, provided it acts without negligence in good faith and in accordance with the terms of the deposit agreement.

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• The depositary disclaims any liability for any failure to determine the lawfulness or practicality of any action, for the content of any document forwarded to you on our behalf or for the accuracy of any translation of such a document, for the investment risks associated with investing in ordinary shares, for the validity or worth of the ordinary shares, for any tax consequences that result from the ownership of ADSs, for the credit-worthiness of any third party, for allowing any rights to lapse under the terms of the deposit agreement, for the timeliness of any of our notices or for our failure to give notice.

• We and the depositary will not be obligated to perform any act that is inconsistent with the terms of the deposit agreement.

• We and the depositary disclaim any liability if we or the depositary are prevented or forbidden from, or delayed in, doing or performing any act or thing required by the terms of the deposit agreement, by reason of any provision, present or future, of any law or regulation, or subject to any civil or criminal penalty or restraint or by reason of any provision, present or future, of our Articles of Incorporation, or any provision of or governing the securities on deposit, or by reason of any act of God or war or other circumstances beyond our control.

• We and the depositary disclaim any liability by reason of any exercise of, or failure to exercise, any discretion provided for in the deposit agreement or in our Articles of Incorporation or in any provisions of or governing the securities on deposit.

• We and the depositary further disclaim any liability for any action or inaction in reliance on the advice or information received from legal counsel, accountants, any person presenting shares for deposit, any holder of ADSs or authorized representatives thereof, or any other person believed by either of us in good faith to be competent to give such advice or information.

• We and the depositary also disclaim liability for the inability by a holder to benefit from any distribution, offering, right or other benefit that is made available to holders of ordinary shares but is not, under the terms of the deposit agreement, made available to you.

• We and the depositary may rely without any liability upon any written notice, request or other document believed to be genuine and to have been signed or presented by the proper parties.

• We and the depositary also disclaim liability for any consequential or punitive damages for any breach of the terms of the deposit agreement.

• No disclaimer of any Securities Act liability is intended by any provision of the deposit agreement.

Pre-Release Transactions

Subject to the terms and conditions of the deposit agreement, the depositary may issue to broker/dealers ADSs before receiving a deposit of ordinary shares or release ordinary shares to broker/dealers before receiving ADSs for cancellation. These transactions are commonly referred to as“pre-release transactions,” and are entered into between the depositary and the applicable broker/dealer. The deposit agreement limits the aggregate size ofpre-release transactions (not to exceed 30% of the ordinary shares on deposit in the aggregate) and imposes a number of conditions on such transactions (i.e., the need to receive collateral, the type of collateral required, the representations required from brokers, etc.). The depositary may retain the compensation received from thepre-release transactions.

Taxes

You will be responsible for the taxes and other governmental charges payable on the ADSs and the securities represented by the ADSs. We, the depositary and the custodian may deduct from any distribution the taxes and governmental charges payable by holders and may sell any and all property on deposit to pay the taxes and governmental charges payable by holders. You will be liable for any deficiency if the sale proceeds do not cover the taxes that are due.

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The depositary may refuse to issue ADSs, to deliver, transfer, split and combine ADRs or to release securities on deposit until all taxes and charges are paid by the applicable holder. The depositary and the custodian may take reasonable administrative actions to obtain tax refunds and reduced tax withholding for any distributions on your behalf. However, you may be required to provide to the depositary and to the custodian proof of taxpayer status and residence and such other information as the depositary and the custodian may require to fulfill legal obligations. You are required to indemnify us, the depositary and the custodian for any claims with respect to taxes based on any tax benefit obtained for you.

Foreign Currency Conversion

The depositary will arrange for the conversion of all foreign currency received into U.S. dollars if such conversion is practical, and it will distribute the U.S. dollars in accordance with the terms of the deposit agreement. You may have to pay fees and expenses incurred in converting foreign currency, such as fees and expenses incurred in complying with currency exchange controls and other governmental requirements.

If the conversion of foreign currency is not practical or lawful, or if any required approvals are denied or not obtainable at a reasonable cost or within a reasonable period, the depositary may take the following actions in its discretion:

• convert the foreign currency to the extent practical and lawful and distribute the U.S. dollars to the holders for whom the conversion and distribution is lawful and practical;

• distribute the foreign currency to holders for whom the distribution is lawful and practical; and

• hold the foreign currency (without liability for interest) for the applicable holders.

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MATERIAL INCOME TAX CONSIDERATIONS

Certain Material U.S. Federal Income Tax Considerations

The following is a summary of certain material U.S. federal income tax considerations relating to the acquisition, ownership and disposition of ADSs by a U.S. Holder (as defined below). This summary addresses only the U.S. federal income tax considerations for U.S. Holders that are initial purchasers of the ADSs pursuant to the offering and that will hold such ADSs as capital assets. This summary does not address all U.S. federal income tax matters that may be relevant to a particular U.S. Holder. This summary does not address tax considerations applicable to a holder of ADSs that may be subject to special tax rules including, without limitation, the following:

• banks, financial institutions or insurance companies;

• brokers, dealers or traders in securities, currencies, commodities, or notional principal contracts;

• tax-exempt entities or organizations, including an “individual retirement account” or “Roth IRA” as defined in Section 408 or 408A of the Code (as defined below), respectively;

• real estate investment trusts, regulated investment companies or grantor trusts;

• persons that hold the ADSs as part of a “hedging,” “integrated” or “conversion” transaction or as a position in a “straddle” for U.S. federal income tax purposes;

• partnerships (including entities or arrangements treated as partnerships for U.S. federal income tax purposes) or other pass-through entities, or persons that will hold the ADSs through such an entity;

• S corporations;

• certain former citizens or long term residents of the United States;

• persons that are subject to Section 451(b) of the Code;

• persons that received ADSs as compensation for the performance of services;

• persons that acquire ADSs as a result of holding or owning our preferred shares;

• holders that own directly, indirectly, or through attribution 10% or more of our ADSs and shares; and

• holders that have a “functional currency” other than the U.S. dollar.

Further, this summary does not address the U.S. federal estate, gift, or alternative minimum tax considerations, or any U.S. state, local, ornon-U.S. tax considerations of the acquisition, ownership and disposition of the ADSs.

This description is based on the U.S. Internal Revenue Code of 1986, as amended (the “Code”), existing, proposed and temporary U.S. Treasury Regulations promulgated thereunder and administrative and judicial interpretations thereof, in each case as in effect and available on the date hereof. All the foregoing is subject to change, which change could apply retroactively, and to differing interpretations, all of which could affect the tax considerations described below. There can be no assurances that the U.S. Internal Revenue Service (the “IRS”) will not take a position concerning the tax consequences of the acquisition, ownership and disposition of the ADSs or that such a position would not be sustained. Holders should consult their own tax advisers concerning the U.S. federal, state, local andnon- U.S. tax consequences of acquiring, owning, and disposing of the ADSs in their particular circumstances.

For the purposes of this summary, a “U.S. Holder” is a beneficial owner of ADSs that is (or is treated as), for U.S. federal income tax purposes:

• an individual who is a citizen or resident of the United States;

• a corporation, or other entity that is treated as a corporation for U.S. federal income tax purposes, created or organized in or under the laws of the United States, any state thereof, or the District of Columbia;

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• an estate, the income of which is subject to U.S. federal income taxation regardless of its source; or

• a trust, if a court within the United States is able to exercise primary supervision over its administration and one or more U.S. persons have the authority to control all of the substantial decisions of such trust or has a valid election in effect under applicable U.S. Treasury Regulations to be treated as a United States person.

If a partnership (or any other entity or arrangement treated as a partnership for U.S. federal income tax purposes) holds ADSs, the U.S. federal income tax consequences relating to an investment in the ADSs will depend in part upon the status of the partner and the activities of the partnership. Such a partner or partnership should consult its tax advisor regarding the U.S. federal income tax considerations of acquiring, owning and disposing of the ADSs in its particular circumstances.

As indicated below, this discussion is subject to U.S. federal income tax rules applicable to a “passive foreign investment company,” or a PFIC.

Persons considering an investment in the ADSs should consult their own tax advisors as to the particular tax consequences applicable to them relating to the acquisition, ownership and disposition of the ADSs, including the applicability of U.S. federal, state and local tax laws andnon-U.S. tax laws.

The discussion below assumes that the representations contained in the deposit agreement are true and that the obligations in the deposit agreement and any related agreement will be complied with in accordance with their terms. Generally, a holder of an ADS should be treated for U.S. federal income tax purposes as the beneficial owner of the ordinary shares represented by the ADS. Accordingly, no gain or loss will be recognized upon an exchange of ADSs for ordinary shares. The U.S. Treasury has expressed concerns that intermediaries in the chain of ownership between the holder of an ADS and the issuer of the security underlying the ADS may be taking actions that are inconsistent with the beneficial ownership by the holder of the underlying security. Accordingly, the creditability of foreign taxes, if any, as described below, could be affected by actions taken by intermediaries in the chain of ownership between the holders of ADSs and our company if as a result of such actions the holders of ADSs are not properly treated as beneficial owners of the underlying ordinary shares.

Distributions.Subject to the discussion under “Passive Foreign Investment Company Considerations,” below, the gross amount of any distribution (before reduction for any amounts withheld in respect of French withholding tax) actually or constructively received by a U.S. Holder with respect to ADSs will be taxable to the U.S. Holder as a dividend to the extent of the U.S. Holder’s pro rata share of our current and accumulated earnings and profits as determined under U.S. federal income tax principles. Distributions in excess of earnings and profits will benon-taxable to the U.S. Holder to the extent of, and will be applied against and reduce, the U.S. Holder’s adjusted tax basis in the ADSs. Distributions in excess of earnings and profits and such adjusted tax basis will generally be taxable to the U.S. Holder as either long-term or short-term capital gain depending upon whether the U.S. Holder has held the ADSs for more than one year as of the time such distribution is received. However, since we do not calculate our earnings and profits under U.S. federal income tax principles, it is expected that any distribution will be reported as a dividend, even if that distribution would otherwise be treated as anon-taxable return of capital or as capital gain under the rules described above.Non-corporate U.S. Holders may qualify for the preferential rates of taxation with respect to dividends on ADSs applicable to long-term capital gains (i.e., gains from the sale of capital assets held for more than one year) applicable to qualified dividend income (as discussed below) if we are a “qualified foreign corporation” and certain other requirements (discussed below) are met. Anon- United States corporation (other than a corporation that is classified as a PFIC for the taxable year in which the dividend is paid or the preceding taxable year) generally will be considered to be a qualified foreign corporation (a) if it is eligible for the benefits of a comprehensive tax treaty with the United States which the Secretary of Treasury of the United States determines is satisfactory for purposes of these rules and which includes an exchange of information provision, or (b) with respect to any dividend it pays on ADSs which are readily tradable on an established securities market in the United States. The ADSs are listed on the Nasdaq

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Global Select Market, which is an established securities market in the United States, and we expect the ADSs to be readily tradable on the Nasdaq Global Select Market. However, there can be no assurance that the ADSs will be considered readily tradable on an established securities market in the United States in the current taxable year or later years. The company, which is incorporated under the laws of France, believes that it qualifies as a resident of France for purposes of, and is eligible for the benefits of, the Convention between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income and Capital, signed on August 31, 1994, as amended and currently in force, or the U.S.-France Tax Treaty, although there can be no assurance in this regard. Further, the IRS has determined that the U.S.-France Tax Treaty is satisfactory for purposes of the qualified dividend rules and that it includes anexchange-of-information program. Therefore, subject to the discussion under “Passive Foreign Investment Company Considerations,” below, such dividends will generally be “qualified dividend income” in the hands ofnon-corporate U.S. Holders, provided that a holding period requirement (more than 60 days of ownership, without protection from the risk of loss, during the121-day period beginning 60 days before theex-dividend date) and certain other requirements are met. The dividends will not be eligible for the dividends-received deduction generally allowed to corporate U.S. Holders.

A U.S. Holder generally may claim the amount of any French withholding tax as either a deduction from gross income or a credit against U.S. federal income tax liability. However, the foreign tax credit is subject to numerous complex limitations that must be determined and applied on an individual basis. Generally, the credit cannot exceed the proportionate share of a U.S. Holder’s U.S. federal income tax liability that such U.S. Holder’s taxable income bears to such U.S. Holder’s worldwide taxable income. In applying this limitation, a U.S. Holder’s various items of income and deduction must be classified, under complex rules, as either “foreign source” or “U.S. source.” In addition, this limitation is calculated separately with respect to specific categories of income. The amount of a distribution with respect to the ADSs that is treated as a “dividend” may be lower for U.S. federal income tax purposes than it is for French income tax purposes, potentially resulting in a reduced foreign tax credit for the U.S. Holder. Each U.S. Holder should consult its own tax advisors regarding the foreign tax credit rules.

In general, the amount of a distribution paid to a U.S. Holder in a foreign currency will be the dollar value of the foreign currency calculated by reference to the spot exchange rate on the day the U.S. Holder receives the distribution, regardless of whether the foreign currency is converted into U.S. dollars at that time. Any foreign currency gain or loss a U.S. Holder realizes on a subsequent conversion of foreign currency into U.S. dollars will be U.S. source ordinary income or loss. If dividends received in a foreign currency are converted into U.S. dollars on the day they are received, a U.S. Holder should not be required to recognize foreign currency gain or loss in respect of the dividend.

Sale, Exchange or Other Taxable Disposition of the ADSs.A U.S. Holder will generally recognize gain or loss for U.S. federal income tax purposes upon the sale, exchange or other taxable disposition of ADSs in an amount equal to the difference between the U.S. dollar value of the amount realized from such sale or exchange and the U.S. Holder’s tax basis for those ADSs. Subject to the discussion under “Passive Foreign Investment Company Considerations” below, this gain or loss will generally be a capital gain or loss. The adjusted tax basis in the ADSs generally will be equal to the cost of such ADSs. Capital gain from the sale, exchange or other taxable disposition of ADSs of anon-corporate U.S. Holder is generally eligible for a preferential rate of taxation applicable to capital gains, if thenon-corporate U.S. Holder’s holding period determined at the time of such sale, exchange or other taxable disposition for such ADSs exceeds one year (i.e., such gain is long-term capital gain). The deductibility of capital losses for U.S. federal income tax purposes is subject to limitations under the Code. Any such gain or loss that a U.S. Holder recognizes generally will be treated as U.S. source income or loss for foreign tax credit limitation purposes.

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For a cash basis taxpayer, units of foreign currency paid or received are translated into U.S. dollars at the spot rate on the settlement date of the purchase or sale. In that case, no foreign currency exchange gain or loss will result from currency fluctuations between the trade date and the settlement date of such a purchase or sale. An accrual basis taxpayer, however, may elect the same treatment required of cash basis taxpayers with respect to purchases and sales of the ADSs that are traded on an established securities market, provided the election is applied consistently from year to year. Such election may not be changed without the consent of the IRS. For an accrual basis taxpayer who does not make such election, units of foreign currency paid or received are translated into U.S. dollars at the spot rate on the trade date of the purchase or sale. Such an accrual basis taxpayer may recognize exchange gain or loss based on currency fluctuations between the trade date and the settlement date. Any foreign currency gain or loss a U.S. Holder realizes will be U.S. source ordinary income or loss.

Medicare Tax.Certain U.S. Holders that are individuals, estates or trusts are subject to a 3.8% tax on all or a portion of their “net investment income,” which may include all or a portion of their dividend income and net gains from the disposition of ADSs. Each U.S. Holder that is an individual, estate or trust is urged to consult its tax advisors regarding the applicability of the Medicare tax to its income and gains in respect of its investment in the ADSs.

Passive Foreign Investment Company Considerations.If we are classified as a passive foreign investment company (“PFIC”) in any taxable year, a U.S. Holder would be subject to special rules generally intended to reduce or eliminate any benefits from the deferral of U.S. federal income tax that a U.S. Holder could derive from investing in anon-U.S. company that does not distribute all of its earnings on a current basis.

A corporation organized outside the United States generally will be classified as a PFIC for U.S. federal income tax purposes in any taxable year in which, after applying certain look-through rules with respect to the income and assets of its subsidiaries, either: (i) at least 75% of its gross income is “passive income” or (ii) at least 50% of the average quarterly value of its total gross assets (which, if we are publicly traded for the entire year being tested, would be measured by the fair market value of our assets, and for which purpose the total value of our assets may be determined in part by the market value of the ADSs and our ordinary shares, which are subject to change) is attributable to assets that produce “passive income” or are held for the production of “passive income.”

Passive income for this purpose generally includes dividends, interest, royalties, rents, gains from commodities and securities transactions, the excess of gains over losses from the disposition of assets which produce passive income, and includes amounts derived by reason of the temporary investment of funds raised in offerings of the ADSs. If anon-U.S. corporation owns directly or indirectly at least 25% by value of the stock of another corporation, thenon-U.S. corporation is treated for purposes of the PFIC tests as owning its proportionate share of the assets of the other corporation and as receiving directly its proportionate share of the other corporation’s income. If we are classified as a PFIC in any year with respect to which a U.S. Holder owns the ADSs, we will continue to be treated as a PFIC with respect to such U.S. Holder in all succeeding years during which the U.S. Holder owns the ADSs, regardless of whether we continue to meet the tests described above.

The market value of our assets may be determined in large part by reference to the market price of the ADSs and our ordinary shares, which is likely to fluctuate after the offering. In addition, the composition of our income and assets will be affected by how, and how quickly, we use the cash proceeds from this global offering in our business. Whether we are a PFIC for any taxable year will depend on our assets and income (including whether we receive certainnon-refundable grants or subsidies and whether such amounts, and the amounts of any reimbursements of research tax credits we receive, will constitute gross income for purposes of the PFIC income test) in each year, and because this is a factual determination made annually after the end of each taxable year, there can be no assurance that we will not be considered a PFIC in any taxable year. Nevertheless, based on the composition of our assets and income for our 2018 taxable year, we believe we were not likely a PFIC for our 2018 taxable year and do not expect to be a PFIC for our 2019 taxable year. However, there can be no assurance that we have not been or will not be a PFIC for the current taxable year or any future taxable year. Our U.S.

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counsel expresses no opinion with respect to our PFIC status for our taxable year ending December 31, 2018, and also expresses no opinion with regard to our expectations regarding our PFIC status in the future.

If we are a PFIC, and you are a U.S. Holder, then unless you make one of the elections described below, a special tax regime will apply to both (a) any “excess distribution” by us to you (generally, your ratable portion of distributions in any year which are greater than 125% of the average annual distribution received by you in the shorter of the three preceding years or your holding period for the ADSs) and (b) any gain realized on the sale or other disposition of the ADSs. Under this regime, any excess distribution and realized gain will be treated as ordinary income and will be subject to tax as if (a) the excess distribution or gain had been realized ratably over your holding period, (b) the amount deemed realized in each year had been subject to tax in each year of that holding period at the highest marginal rate for such year (other than income allocated to the current period or any taxable period before we became a PFIC, which would be subject to tax at the U.S. Holder’s regular ordinary income rate for the current year and would not be subject to the interest charge discussed below), and (c) the interest charge generally applicable to underpayments of tax had been imposed on the taxes deemed to have been payable in those years. In addition, dividend distributions made to you will not qualify for the lower rates of taxation applicable to long-term capital gains discussed above under “Distributions.”

Certain elections exist that may alleviate some of the adverse consequences of PFIC status and would result in an alternative treatment (such asmark-to-market treatment) of the ADSs. If a U.S. Holder makes themark-to- market election, the U.S. Holder generally will recognize as ordinary income any excess of the fair market value of the ADSs at the end of each taxable year over their adjusted tax basis, and will recognize an ordinary loss in respect of any excess of the adjusted tax basis of the ADSs over their fair market value at the end of the taxable year (but only to the extent of the net amount of income previously included as a result of themark-to-market election). If a U.S. Holder makes the election, the U.S. Holder’s tax basis in the ADSs will be adjusted to reflect these income or loss amounts. Any gain recognized on the sale or other disposition of ADSs in a year when we are a PFIC will be treated as ordinary income and any loss will be treated as an ordinary loss (but only to the extent of the net amount of income previously included as a result of themark-to-market election). Themark-to-market election is available only if we are a PFIC and the ADSs are “regularly traded” on a “qualified exchange.” The ADSs will be treated as “regularly traded” in any calendar year in which more than a de minimis quantity of the ADSs are traded on a qualified exchange on at least 15 days during each calendar quarter (subject to the rule that trades that have as one of their principal purposes the meeting of the trading requirement are disregarded). The Nasdaq Global Select Market is a qualified exchange for this purpose and, consequently, if the ADSs are regularly traded, themark-to-market election will be available to a U.S. Holder.

We do not currently intend to provide the information necessary for U.S. Holders to make qualified electing fund elections if we are treated as a PFIC for any taxable year. U.S. Holders should consult their tax advisors to determine whether any of these elections would be available and if so, what the consequences of the alternative treatments would be in their particular circumstances.

If we are determined to be a PFIC, the general tax treatment for U.S. Holders described in this section would apply to indirect distributions and gains deemed to be realized by U.S. Holders in respect of any of our subsidiaries that also may be determined to be PFICs.

If a U.S. Holder owns ADSs during any taxable year in which we are a PFIC, the U.S. Holder generally will be required to file an IRS Form 8621 (Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund) with respect to the company, generally with the U.S. Holder’s federal income tax return for that year. If our company were a PFIC for a given taxable year, then you should consult your tax advisor concerning your annual filing requirements.

The U.S. federal income tax rules relating to PFICs are complex. Prospective U.S. investors are urged to consult their own tax advisers with respect to the acquisition, ownership and disposition of the ADSs, the consequences to them of an investment in a PFIC, any elections available with respect to the ADSs and the

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IRS information reporting obligations with respect to the acquisition, ownership and disposition of the ADSs.

Backup Withholding and Information Reporting.U.S. Holders generally will be subject to information reporting requirements with respect to dividends on ADSs and on the proceeds from the sale, exchange or disposition of ADSs that are paid within the United States or through U.S.-related financial intermediaries, unless the U.S. Holder is an “exempt recipient.” In addition, U.S. Holders may be subject to backup withholding on such payments, unless the U.S. Holder provides a taxpayer identification number and a duly executed IRS FormW-9 or otherwise establishes an exemption. Backup withholding is not an additional tax, and the amount of any backup withholding will be allowed as a credit against a U.S. Holder’s U.S. federal income tax liability and may entitle such holder to a refund, provided that the required information is timely furnished to the IRS.

Foreign Asset Reporting.Certain U.S. Holders who are individuals are required to report information relating to an interest in the ADSs, subject to certain exceptions (including an exception for shares held in accounts maintained by U.S. financial institutions) by filing IRS Form 8938 (Statement of Specified Foreign Financial Assets) with their federal income tax return. U.S. Holders are urged to consult their tax advisors regarding their information reporting obligations, if any, with respect to their ownership and disposition of the ADSs.

THE DISCUSSION ABOVE IS A GENERAL SUMMARY. IT DOES NOT COVER ALL TAX MATTERS THAT MAY BE OF IMPORTANCE TO A PROSPECTIVE INVESTOR. EACH PROSPECTIVE INVESTOR IS URGED TO CONSULT ITS OWN TAX ADVISOR ABOUT THE TAX CONSEQUENCES TO IT OF AN INVESTMENT IN ADSS IN LIGHT OF THE INVESTOR’S OWN CIRCUMSTANCES.

French Tax Consequences

The following describes the material French tax consequences to U.S. Holders (as defined below) of purchasing, owning and disposing of our ADSs and, unless otherwise noted, this discussion is the opinion of McDermott Will & Emery AARPI, our French tax counsel, insofar as it relates to matters of French tax law and legal conclusions with respect to those matters.

This discussion does not purport to be a complete analysis or listing of all potential tax effects of the acquisition, ownership or disposition of our ADSs to any particular investor, and does not discuss tax considerations that arise from rules of general application or that are generally assumed to be known by investors. All of the following is subject to change. Such changes could apply retroactively and could affect the consequences described below.

French tax rules applicable to French assets that are held by or in foreign trusts provide inter alia for the inclusion of trust assets in the settlor’s net assets for purpose of assessing the French real estate wealth tax, the French gift and estate tax, the specific tax on value of the French assets, within the scope of the French real estate wealth tax, held in or by foreign trusts not already subject to the French real estate wealth tax, and for a number of French tax reporting and disclosure obligations. The following discussion does not address the French tax consequences applicable to ADSs held in trusts. If ADSs are held in trust, the grantor, trustee and beneficiary are urged to consult their own tax adviser regarding the specific tax consequences of acquiring, owning and disposing of securities.

The description of the French income tax and wealth tax consequences set forth below is based on the Convention Between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on

Income and Capital of August 31, 1994, or the Treaty, which came into force on December 30, 1995 (as amended by any subsequent protocols, including the protocol of January 13, 2009), and the tax guidelines issued by the French tax authorities in force as of the date of this prospectus (the “Treaty”).

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For the purposes of this discussion, a “U.S. Holder” is a beneficial owner of ADSs that is (or is treated as), for U.S. federal income tax purposes: (1) an individual who is a citizen or resident of the United States; (2) a corporation, or other entity that is treated as a corporation for U.S. federal income tax purposes, created or organized in or under the laws of the United States, any state thereof, or the District of Columbia; (3) an estate, the income of which is subject to U.S. federal income taxation regardless of its source; or (4) a trust, if a court within the United States is able to exercise primary supervision over its administration and one or more U.S. persons have the authority to control all of the substantial decisions of such trust or has a valid election in effect under applicable U.S. Treasury Regulations to be treated as a United States person.

If a partnership (or any other entity treated as partnership for U.S. federal income tax purposes) holds ADSs, the tax treatment of the partnership and a partner in such partnership generally will depend on the status of the partner and the activities of the partnership. Such partner or partnership is urged to consult its own tax adviser regarding the specific tax consequences of acquiring, owning and disposing of securities.

This discussion applies only to investors that hold ADSs as capital assets that have the U.S. dollar as their functional currency, that are entitled to Treaty benefits under the “Limitation on Benefits” provision contained in the Treaty, and whose ownership of the ADSs is not effectively connected to a permanent establishment or a fixed base in France. Certain U.S. Holders (including, but not limited to, U.S. expatriates, partnerships or other entities classified as partnerships for U.S. federal income tax purposes, banks, insurance companies, regulated investment companies,tax-exempt organizations, financial institutions, persons subject to the alternative minimum tax, persons who acquired the securities pursuant to the exercise of employee share options or otherwise as compensation, persons that own (directly, indirectly or by attribution) 5% or more of our voting stock or 5% or more of our outstanding share capital, dealers in securities or currencies, persons that elect to mark their securities to market for U.S. federal income tax purposes and persons holding securities as a position in a synthetic security, straddle or conversion transaction) may be subject to special rules not discussed below.

U.S. Holders are urged to consult their own tax advisers regarding the tax consequences of the purchase, ownership and disposition of securities in light of their particular circumstances, especially with regard to the ‘‘Limitations on Benefits’’ provision.

Estate and Gift Taxes and Transfer Taxes

In general, a transfer of securities by gift or by reason of death of a U.S. Holder that would otherwise be subject to French gift or inheritance tax, respectively, will not be subject to such French tax by reason of the Convention between the Government of the United States of America and the Government of the French Republic for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Estates, Inheritances and Gifts, dated November 24, 1978 (as amended by the protocol of December 8, 2004), unless the donor or the transferor is domiciled in France at the time of making the gift or at the time of his or her death, or the securities were used in, or held for use in, the conduct of a business through a permanent establishment or a fixed base in France.

Pursuant to Article 235 ter ZD of the Code général des impôts (French Tax Code, or FTC), purchases of shares or ADSs of a French company listed on a regulated market of the European Union or an exchange formally acknowledged by the French Financial Market Authority (AMF) are subject to a 0.3% French tax on financial transactions provided that the issuer’s market capitalization exceeds 1 billion euros as of December 1 of the year preceding the taxation year. A list of French relevant companies whose market capitalization exceeds 1 billion euros as of December 1 of the year preceding the taxation year is published annually by the French State. Although we were included in the list published for calendar years 2016 and 2017, we were not included in the list published for calendar years 2018, 2019 and 2020, but this may change in the future.

Pursuant to Article 726 II d) of the FTC, transfers of securities that are subject to the French tax on financial transactions are exempt from any transfer tax in France. Conversely, in the case where Article 235 ter ZD of the

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FTC is not applicable, transfers of shares issued by a French listed company will be subject to uncapped registration duties at the rate of 0.1% if the transfer is evidenced by a written statement (“acte”) executed either in France or outside France. Although there is no case law or official guidelines published by the French tax authorities on this point, transfers of ADSs should remain outside of the scope of the aforementioned 0.1% registration duties.

Wealth Tax

The French real estate wealth tax (impôt sur la fortune immobilière), introduced by French Finance Bill dated December 30^th 2017, applies only to individuals who own, directly or indirectly, through one or more legal entities, real estate property in France (subject to certain exemptions) ) and whose net taxable assets amount to at least €1,300,000.

French real estate wealth tax in France may only apply to U.S. Holders, with respect to shares, rights, or interest in a company, to the extent that such company holds real estate assets that are not allocated to its operational activity, for the fraction of the value of the shares, rights or interest in the company representing such real estate assets, In any case, pursuant to Article 965 2° of the FTC, shares of an operating entity holding French real estate assets in which the taxpayer holds, directly and indirectly, less than 10% of the share capital or voting rights are exempt from real estate wealth tax.

Taxation of Dividends

Dividends paid by a French corporation tonon-residents of France are generally subject to French withholding tax at a rate of 12.8% when the recipient is an individual and at the standard corporate income tax rate set forth in Article219-I of the FTC i.e., 28% in 2020) otherwise. Dividends paid by a French corporation in anon-cooperative State or territory, within the meaning of Article238-0 A of the FTC (other than thenon-cooperative States or territories mentioned in Article238-0 A 2 bis 2° of the FTC), will generally be subject to French withholding tax at a rate of 75%. However, eligible U.S. Holders, other than individuals subject to the French withholding tax at a rate of 12.8%, entitled to Treaty benefits under the “Limitation on Benefits” provision contained in the Treaty who are U.S. residents, as defined pursuant to the provisions of the Treaty, may be subject to the withholding tax at a reduced rate (as described below).

Under the Treaty, the rate of French withholding tax on dividends paid to an eligible U.S. Holder which is a U.S. resident as defined pursuant to the provisions of the Treaty and which ownership of the ordinary shares or ADSs is not effectively connected with a permanent establishment or fixed base that such U.S. Holder has in France may be capped at 15%, or 5% if such U.S. Holder is a corporation and owns directly or indirectly at least 10% of the share capital of the issuer; such U.S. Holder may claim a refund from the French tax authorities of the amount withheld in excess of the Treaty rates of 15% or 5%, if any.

For U.S. Holders that are not individuals but are U.S. residents, as defined pursuant to the provisions of the Treaty, the requirements for eligibility for Treaty benefits, including the reduced 5% or 15% withholding tax rates, contained in the “Limitation on Benefits” provision of the Treaty, are complex. U.S. Holders are advised to consult their own tax advisers regarding their eligibility for Treaty benefits in light of their own particular circumstances.

Dividends paid to an eligible U.S. Holder may immediately be subject to the reduced rates provided that such U.S. Holder establishes before the date of payment that it is a U.S. resident under the Treaty by completing and providing the depositary with a treaty form (Form 5000). Dividends paid to a U.S. Holder, other than individuals subject to the French withholding tax at the rate of 12.8%, that has not filed the Form 5000 before the dividend payment date will be subject to French withholding tax at the rate of 28%, or 75% if paid in anon-cooperative State or territory (within the meaning of Article238-0 A of the FTC, other than thenon-cooperative States or territories mentioned in Article238-0 A 2 bis 2° of the FTC), and then reduced at a later date to 5% or 15%, provided that such holder duly completes and provides the depositary with the treaty forms Form 5000 and Form 5001 before December 31 of the second calendar year following the year during which the dividend is paid.

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Certain qualifying pension funds and certain othertax-exempt entities are subject to the same general filing requirements as other U.S. Holders except that they may have to supply additional documentation evidencing their entitlement to these benefits.

Form 5000 and Form 5001, together with instructions, will be provided by the depositary to all U.S. Holders registered with the depositary. The depositary will arrange for the filing with the French Tax authorities of all such forms properly completed and executed by U.S. Holders of ordinary shares or ADSs and returned to the depositary in sufficient time so that they may be filed with the French tax authorities before the distribution in order to obtain immediately a reduced withholding tax rate.

The withholding tax refund, if any, ordinarily occurs within 12 months from filing the applicable French Treasury Form, but not before January 15 of the year following the calendar year in which the related dividend was paid.

Since the withholding tax rate applicable under French domestic law to U.S. Holders who are individuals does not exceed the cap provided in the Treaty (i.e. 15%), the 12.8% rate shall apply to dividends paid to those U.S. Holders, without any reduction provided under the Treaty.

Tax on Sale or Other Disposition

In general, under the Treaty, a U.S. Holder who is a U.S. resident for purposes of the Treaty will not be subject to French tax on any capital gain from the redemption, sale or exchange of ordinary shares or ADSs unless the ordinary shares or the ADSs form part of the business property of a permanent establishment or fixed base that the U.S. Holder has in France. Special rules apply to U.S. Holders who are residents of more than one country.

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UNDERWRITERS

The global offering consists of:

• an offering of a total of ordinary shares in the form of ADSs in the United States, Canada and countries outside Europe; and

• a concurrent offering of a total of ordinary shares in Europe (including France) exclusively addressed to “qualified investors” (as this term is defined under EU Regulation n°2017/1129).

Under the terms and subject to the conditions in an underwriting agreement dated the date of this prospectus supplement, the U.S. underwriters named below, for whom Goldman Sachs International, Citigroup Global Markets Inc. and Citigroup Global Markets Limited are acting as managers, have severally agreed to purchase, and we have agreed to sell to them, severally, the number of ADSs and/or ordinary shares indicated below:

Name	Number of ADSs	Number of Ordinary Shares
Goldman Sachs International
Citigroup Global Markets Inc.
Citigroup Global Markets Limited
Total

The underwriters are offering the ADSs and ordinary shares subject to their acceptance of the ADSs and ordinary shares from us and subject to prior sale. The underwriting agreement provides that the obligations of the several underwriters to pay for and accept delivery of the ADSs and ordinary shares offered by this prospectus supplement are subject to the approval of certain legal matters by their counsel and to certain other conditions. The underwriters are obligated to take and pay for all of the ADSs and ordinary shares offered by this prospectus supplement if any such securities are taken. However, the underwriters are not required to take or pay for the ADSs and ordinary shares covered by the underwriters’ option to purchase additional shares described below. The offering price and the total underwriting commissions per ADS or per ordinary share for the U.S. offering and the European offering are identical, subject to the ratio of ADSs/ordinary shares and currency conversion. The underwriters may provide their services in this global offering through or in conjunction with one or more of their respective affiliates.

The underwriters initially propose to offer part of the ADSs and ordinary shares directly to the public at the offering price listed on the cover page of this prospectus supplement and part to certain dealers. After the initial offering of the ADSs and ordinary shares, the offering price and other selling terms may from time to time be varied by the representative.

We have agreed to issue at the option of the underwriters up to                additional ordinary shares in the form of ADSs at the public offering price listed on the cover page of this prospectus supplement, less underwriting commissions. The option granted may be exercised at any time in whole or in part by the underwriters within 30 days from the date of the underwriting agreement. To the extent the option is exercised, each underwriter will become obligated, subject to certain conditions, to purchase about the same percentage of the additional ordinary shares in the form of ADSs as the number listed next to the underwriter’s name in the preceding table bears to the total number of ADSs or ordinary shares, as applicable, listed next to the names of all underwriters in the preceding table.

The address of Goldman Sachs International is Plumtree Court, 25 Shoe Lane, London EC4A 4AU, the address of Citigroup Global Markets Inc. is 388 Greenwich Street, New York, New York 10013 and the address of Citigroup Global Markets Limited is Citigroup Centre, Canada Square, Canary Wharf E14 5LB—United Kingdom.

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The following table shows the per share and total public offering price, underwriting commissions, and proceeds before expenses to us. These amounts are shown assuming both no exercise and full exercise of the underwriters’ option to purchase up to                additional ordinary shares in the form of ADSs.

	Paid by DBV Technologies
	No Exercise	Full Exercise
Per Ordinary Share	$	$
Per ADS(1)	$	$
Total(1)	$	$

(1) Assumes an exchange rate of $ per Euro.

The estimated offering expenses payable by us, exclusive of the underwriting commissions, are approximately $1.0 million. We have agreed to reimburse the underwriters for expense relating to clearance of this offering with the Financial Industry Regulatory Authority up to $30,000.

The ADSs are listed on the Nasdaq Global Select Market under the trading symbol “DBVT,” and the ordinary shares are listed on Euronext Paris under the symbol “DBV.” The public offering price for the ordinary shares and ADSs was determined by negotiations between us and the representatives and based, in part, on the trading price of our ordinary shares on Euronext Paris and our ADSs on the Nasdaq Global Select Market, and prevailing market conditions.

We, all of our directors and officers have agreed that, without the prior written consent of Goldman Sachs International and Citigroup Global Markets Inc. on behalf of the underwriters, we and they will not, subject to specified exemptions offer, sell, assign, transfer, pledge, contract to sell, or otherwise dispose of or announce the intention to otherwise dispose of, or enter into any swap, hedge or similar agreement or arrangement that transfers, in whole or in part, the economic risk of ownership of, directly or indirectly, or make any demand or request or exercise any right with respect to the registration of, or file with the Securities and Exchange Commission a registration statement under the Securities Act of 1933, as amended, relating to, any ordinary shares or securities convertible into or exchangeable or exercisable for any ordinary shares (including ADSs).

The restrictions described in the immediately preceding paragraph to do not apply to the following, subject to specified exceptions:

(i) ordinary shares or ADSs acquired in the global offering;

(ii) ordinary shares or ADSs acquired in open market transactions on or after the date of this prospectus supplement;

(iii) ordinary shares or ADSs disposed of as bona fide gifts;

(iv) transfers to any trust for the shareholder’s direct or indirect benefit or to its immediate family, or to any beneficiary;

(v) by will or intestate succession upon death;

(vi) by operation of law pursuant to a qualified domestic order or in connection with a divorce settlement; or

(vii) if the shareholder is a corporation, partnership, limited liability company, trust or other business entity (A) to another corporation, partnership, limited liability company, trust or other business entity that is the shareholder’s affiliate or (B) as part of a distribution without consideration by us to our stockholders, partners, members or other equity holders.

Goldman Sachs International and Citigroup Global Markets Inc., in their sole discretion, may release the ordinary shares or ADSs and other securities subject to thelock-up agreements described above in whole or in part at any time.

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In order to facilitate the offering of the ADSs and ordinary shares, the underwriters may engage in transactions that stabilize, maintain or otherwise affect the price of the ADSs and ordinary shares. Stabilization transactions will need to comply with European Union laws and notably the Market Abuse Regulations. These activities may have the effect of stabilizing or maintaining the market price of the ADSs and ordinary shares at the level above the one that might otherwise prevail in the open market. Specifically, the underwriters may sell more shares than they are obligated to purchase under the underwriting agreement, creating a short position. A short sale is covered if the short position is no greater than the number of shares available for purchase by the underwriters under the option. The underwriters can close out a covered short sale by exercising the option or purchasing shares in the open market. In determining the source of shares to close out a covered short sale, the underwriters will consider, among other things, the open market price of shares compared to the price available under the option. The underwriters may also sell shares in excess of the option, creating a naked short position. The underwriters must close out any naked short position by purchasing shares in the open market. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the ADSs and ordinary shares in the open market after pricing that could adversely affect investors who purchase in this offering. As an additional means of facilitating this offering, the underwriters may bid for, and purchase, ADSs and ordinary shares in the open market to stabilize the price of the ADSs and ordinary shares. These activities may raise or maintain the market price of the ADSs and ordinary shares above independent market levels or prevent or retard a decline in the market price of the ADSs and ordinary shares. The underwriters are not required to engage in these activities and may end any of these activities at any time.

We and the underwriters have agreed to indemnify each other against certain liabilities, including liabilities under the Securities Act.

A prospectus supplement in electronic format may be made available on websites maintained by one or more underwriters, or selling group members, if any, participating in this offering. The representatives may agree to allocate a number of ADSs and ordinary shares to underwriters for sale to their online brokerage account holders. Internet distributions will be allocated by the representatives to underwriters that may make Internet distributions on the same basis as other allocations.

The underwriters and their respective affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, investment research, principal investment, hedging. financing and brokerage activities. Certain of the underwriters and their respective affiliates have, from time to time, performed, and may in the future perform, various financial advisory and investment banking services for us, for which they received or will receive customary fees and expenses.

In addition, in the ordinary course of their various business activities, the underwriters and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers and may at any time hold long and short positions in such securities and instruments. Such investment and securities activities may involve our securities and instruments. The underwriters and their respective affiliates may also make investment recommendations or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to clients that they acquire, long or short positions in such securities and instruments.

Extended Settlement

We expect that delivery of the ordinary shares and ADSs will be made to investors on or about the third business day following the date of the final prospectus supplement (this settlement cycle being referred to as “T+3”). Under Rule 15c6-1 of the Securities Exchange Act of 1934, as amended, trades in the secondary market are required to settle in two business days, unless the parties to any such trade expressly agree otherwise. Accordingly, if you wish to trade the securities before their delivery, you will be required, because the securities

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initially will settle in T+3, to specify an alternate settlement cycle at the time of any such trade to prevent a failed settlement. If you wish to trade the securities before their delivery, you should consult your advisors.

Selling Restrictions

European Economic Area

In relation to each Member State of the European Economic Area (each, a “Member State”), no offer of shares may be made to the public in that Member State other than:

• to any legal entity which is a “qualified investor” as defined in the Prospectus Regulation;

• to fewer than 150 natural or legal persons (other than qualified investors as defined in the Prospectus Regulation), subject to obtaining the prior consent of the underwriters for any such offer; or

• in any other circumstances falling within Article 1(4) of the Prospectus Regulation, provided that no such offer of shares shall require us or any underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 23 of the Prospectus Regulation and each person who initially acquires any shares or to whom any offer is made will be deemed to have represented, acknowledged and agreed to and with each of the underwriters and us that it is a “qualified investor” as defined in the Prospectus Regulation.

In the case of any shares being offered to a financial intermediary as that term is used in Article 5 of the Prospectus Regulation, each such financial intermediary will be deemed to have represented, acknowledged and agreed that the shares acquired by it in the offer have not been acquired on a nondiscretionary basis on behalf of, nor have they been acquired with a view to their offer or resale to, persons in circumstances which may give rise to an offer of any shares to the public other than their offer or resale in a Member State to qualified investors as so defined or in circumstances in which the prior consent of the underwriters has been obtained to each such proposed offer or resale.

For the purposes of this provision, the expression an “offer of shares to the public” in relation to any shares in any Member State means the communication in any form and by means of sufficient information on the terms of the offer and the shares to be offered so as to enable an investor to decide to purchase shares, and the expression “Prospectus Regulation” means Regulation (EU) 2017/1129 (as amended).

According to the product governance requirements contained within: (a) EU Directive 2014/65/EU on markets in financial instruments, as amended (“MiFID II”); (b) Articles 9 and 10 of Commission Delegated Directive (EU) 2017/593 supplementing MiFID II; and (c) local implementing measures (together the “MiFID II Product Governance Requirements”), and disclaiming all and any liability, which any “manufacturer” (for the purposes of the MiFID II Product Governance Requirements) may otherwise have with respect thereto, the target market assessment in respect of the ordinary shares offered in the global offering has led to the conclusion that the ordinary shares are: (i) compatible with an end target market of retail investors and investors who meet the criteria of eligible counterparties and professional clients, each as defined in MiFID II; and (ii) eligible for distribution through all distribution channels as are permitted by MiFID II (the “Target Market Assessment”). The Target Market Assessment is without prejudice to the requirements of any contractual, legal or regulatory selling restrictions in relation to the European offering tranche of the global offering. Furthermore, it is noted that, notwithstanding the Target Market Assessment, the joint lead book-running managers and theco-managers will only procure investors who meet the criteria of professional clients and eligible counterparties with respect to the ordinary shares. The Target Market Assessment is conducted solely for the purposes of the manufacturer’s product approval process and neither constitutes an assessment for any particular client of suitability or appropriateness for the purposes of MiFID II nor a recommendation to invest in, or purchase, or take any other action whatsoever with respect to the ordinary shares. Notwithstanding the Target Market Assessment, the attention of distributors is drawn to the fact that: the price of the ordinary shares sold in the European offering could decline and investors could lose all or part of their investment; the ordinary shares sold in the European

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offering offer no guaranteed income and no capital protection; and that an investment in such shares is compatible only with investors who do not need a guaranteed income or capital protection, who are capable (either alone or in conjunction with an appropriate financial or other adviser) of evaluating the merits and risks of such an investment and have sufficient resources to be able to bear any losses that may result therefrom.

France

The ADSs and the ordinary shares have not been offered or sold and will not be offered or sold, directly or indirectly, to the public in France and no offering or this prospectus or any marketing materials relating to the ADSs and the ordinary shares must be made available or distributed in any way that would constitute, directly or indirectly, an offer to the public in France.

The ADSs and the ordinary shares may only be offered or sold in Europe (including France) pursuant to article L.411-2 of the FrenchCode monétaire et financierto qualified investors (investisseurs qualifiés) acting for their own account, as defined in Prospectus Regulation 2017/1129 dated June 14, 2017 (“Prospectus Regulation”).

Prospective investors are informed that:

• neither this prospectus nor any other offering materials relating to the ADSs described in this prospectus has been submitted for clearance to the French financial market authority (Autorité des marchés financiers);

• neither this prospectus, nor any offering material relating to the ADSs and the ordinary shares has been or will be released, issued, distributed or caused to be released, issued or distributed to investors other than qualified investors (as defined under Article 2(e) of the Prospectus Regulation) in France or used in connection with any offer for subscription or sale of the ADSs and the ordinary shares to the public in France within the meaning of the Prospectus Regulation;

• individuals or entities referred to as “qualified investors” under Article 2 point (e) of the Prospectus Regulation may participate in the global offering for their own account, as provided under articlesD.411-1 andD.411-2 of the French Monetary and Financial Code (Code monétaire et financier) ; and

• the direct and indirect distribution or sale to the public of the ordinary shares, including in the form of ADSs, acquired by them may only be made in compliance with Prospectus Regulation and articlesL. 411-1 to L.411-2-1, L.412-1 and L.621-8 to L.621-8-2 of the FrenchCode monétaire et financier.

United Kingdom

Each underwriter has represented and agreed that:

(a) it has only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000 (“FSMA”) received by it in connection with the issue or sale of the shares of our ADSs in circumstances in which Section 21(1) of the FSMA does not apply to us; and

(b) it has complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the shares of our ADSs in, from or otherwise involving the United Kingdom.

Hong Kong

The securities may not be offered or sold in Hong Kong by means of any document other than (i) in circumstances which do not constitute an offer to the public within the meaning of the Companies Ordinance (Cap. 32, Laws of Hong Kong), or (ii) to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder, or (iii) in other circumstances which do not result in the

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document being a “prospectus” within the meaning of the Companies Ordinance (Cap. 32, Laws of Hong Kong) and no advertisement, invitation or document relating to the securities may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the laws of Hong Kong) other than with respect to the securities which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder.

Japan

No registration pursuant to Article 4, paragraph 1 of the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended) (the “FIEL”) has been made or will be made with respect to the solicitation of the application for the acquisition of the ADSs.

Accordingly, the securities have not been, directly or indirectly, offered or sold and will not be, directly or indirectly, offered or sold in Japan or to, or for the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan) or to others forre-offering orre-sale, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan except pursuant to an exemption from the registration requirements, and otherwise in compliance with, the FIEL and the other applicable laws and regulations of Japan.

For Qualified Institutional Investors (“QII”)

Please note that the solicitation for newly-issued or secondary securities (each as described in Paragraph 2, Article 4 of the FIEL) in relation to the securities constitutes either a “QII only private placement” or a “QII only secondary distribution” (each as described in Paragraph 1, Article23-13 of the FIEL). Disclosure regarding any such solicitation, as is otherwise prescribed in Paragraph 1, Article 4 of the FIEL, has not been made in relation to the ADSs. The ADSs may only be transferred to QIIs.

ForNon-QII Investors

Please note that the solicitation for newly-issued or secondary securities (each as described in Paragraph 2, Article 4 of the FIEL) in relation to the securities constitutes either a “small number private placement” or a “small number private secondary distribution” (each as is described in Paragraph 4, Article23-13 of the FIEL). Disclosure regarding any such solicitation, as is otherwise prescribed in Paragraph 1, Article 4 of the FIEL, has not been made in relation to the securities. The securities may only be transferred en bloc without subdivision to a single investor.

Singapore

This prospectus has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the securities may not be circulated or distributed, nor may the securities be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor under Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”), (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to Section 275(1A), and in accordance with the conditions specified in Section 275 of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA, in each case subject to compliance with conditions set forth in the SFA.

Where the securities are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

• a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

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• a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an accredited investor.

• shares, debentures and units of shares and debentures of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the securities pursuant to an offer made under Section 275 of the SFA except:

• to an institutional investor (for corporations, under Section 274 of the SFA) or to a relevant person defined in Section 275(2) of the SFA, or to any person pursuant to an offer that is made on terms that such shares, debentures and units of shares and debentures of that corporation or such rights and interest in that trust are acquired at a consideration of not less than $0.2 million (or its equivalent in a foreign currency) for each transaction, whether such amount is to be paid for in cash or by exchange of securities or other assets, and further for corporations, in accordance with the conditions specified in Section 275 of the SFA;

• where no consideration is or will be given for the transfer; or

• where the transfer is by operation of law.

Canada

The securities may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument45-106Prospectus Exemptions or subsection 73.3(1) of theSecurities Act (Ontario), and are permitted clients, as defined in National Instrument31-103Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the securities must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 of National Instrument33-105 Underwriting Conflicts (“NI33-105”), the underwriters are not required to comply with the disclosure requirements of NI33-105 regarding underwriter conflicts of interest in connection with this offering.

Switzerland

The securities may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange, or the SIX, or on any other stock exchange or regulated trading facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other offering or marketing material relating to the securities or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this document nor any other offering or marketing material relating to the offering, the company or the securities have been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the offer of securities will not be supervised by, the Swiss Financial Market Supervisory Authority FINMA (FINMA), and the offer of securities has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes, or CISA. The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of securities.

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MATERIAL CHANGES

Except as described above or otherwise described in ourAnnual Report on Form20-F for the fiscal year ended December 31, 2018 and in our Form6-Ks incorporated by reference into this prospectus supplement, no reportable material changes have occurred since December 31, 2018.

ENFORCEMENT OF CIVIL LIABILITIES

We are a corporation organized under the laws of France. The majority of our directors are citizens and residents of countries other than the United States, and the majority of our assets are located outside of the United States. Accordingly, it may be difficult for investors:

• to obtain jurisdiction over us or ournon-U.S. resident officers and directors in U.S. courts in actions predicated on the civil liability provisions of the U.S. federal securities laws;

• to enforce judgments obtained in such actions against us or ournon-U.S. resident officers and directors;

• to bring an original action in a French court to enforce liabilities based upon the U.S. federal securities laws against us or ournon-U.S. resident officers or directors; and

• to enforce against us or our directors innon-U.S. courts, including French courts, judgments of U.S. courts predicated upon the civil liability provisions of the U.S. federal securities laws.

Nevertheless, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would be recognized and enforced in France provided that a French judge considers that this judgment meets the French legal requirements concerning the recognition and the enforcement of foreign judgments and is capable of being immediately enforced in the United States. A French court is therefore likely to grant the enforcement of a foreign judgment without a review of the merits of the underlying claim thereby adjudicated through an action for exequatur, only if (1) such U.S. judgment was rendered by a court having jurisdiction over the matter because the dispute is clearly connected to the jurisdiction of such court (i.e., there was no international forum shopping); (2) the choice of U.S. court was not fraudulent and the French courts did not have exclusive jurisdiction over the matter; (3) that judgment resulted from legal proceedings compatible with French standards of due process; (4) that judgment does not contravene international public order and public policy of France; (5) the jurisdiction of the United States federal or state court is consistent with French conflict of jurisdiction rules and (6) there are no proceedings pending before French courts at the time enforcement of the U.S. judgment is sought and having the same or similar subject matter as the U.S. judgment and no such proceedings are filed before French courts after the enforcement proceedings have been initiated. The French court would also require that the U.S. judgment is not tainted with fraud and is not incompatible with a judgment rendered by a French court in the same matter, or with an earlier judgment rendered by a foreign court in the same matter.

In addition, French law guarantees full compensation for the harm suffered but is limited to the actual damages, so that the victim does not suffer or benefit from the situation. Such system excludes damages such as, but not limited to, punitive and exemplary damages.

As a result, the enforcement, by U.S. investors, of any judgments obtained in U.S. courts in civil and commercial matters, including judgments under the U.S. federal securities law against us or members of our board of directors, officers or certain experts named herein who are residents of France or countries other than the United States would be subject to the above conditions.

Finally, there may be doubt as to whether a French court would impose civil liability on us, the members of our board of directors, our officers or certain experts named herein in an original action predicated solely upon the U.S. federal securities laws brought in a court of competent jurisdiction in France against us or such members, officers or experts, respectively.

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LEGAL MATTERS

Cooley LLP, Boston, Massachusetts, will be representing us in connection with this offering. McDermott Will & Emery AARPI will pass upon the validity of the ordinary shares, including ordinary shares represented by ADSs, to be offered and other legal matters relating to French law, including matters of French income tax law, in connection with this offering. Goodwin Procter LLP, New York, New York, and Gide Loyrette Nouel A.A.R.P.I are representing the underwriters in connection with this offering.

EXPERTS

Our consolidated financial statements as of December 31, 2017 and 2018, and for each of the three years in the period ended December 31, 2018, appearing in our Annual Report on Form20-F for the year ended December 31, 2018, and the effectiveness of internal control over financial reporting as of December 31, 2018, have been audited by Deloitte & Associés, an independent registered public accounting firm, as stated in their reports thereon, included therein, and are incorporated by reference herein (which reports: (1) express an unqualified opinion on the consolidated financial statements and includes an explanatory paragraph referring to going concern and (2) express an unqualified opinion on the effectiveness of internal control over financial reporting). Such consolidated financial statements have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

The offices of Deloitte & Associés are located at 6, place de la Pyramide, 92908Paris-la-Défense Cedex, Puteaux, France.

WHERE YOU CAN FIND MORE INFORMATION

We have filed with the SEC a registration statement on FormF-3 under the Securities Act with respect to the securities described in this prospectus supplement and the accompanying prospectus. This prospectus supplement and the accompanying prospectus do not contain all of the information included in that registration statement.

The SEC maintains an Internet website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers, such as us, that file electronically with the SEC.

We are subject to the information reporting requirements of the Exchange Act applicable to foreign private issuers and under those requirements we file reports with the SEC. Those reports may be inspected without charge at the locations described above. As a foreign private issuer, we are exempt from the rules under the Exchange Act related to the furnishing and content of proxy statements, and our officers, directors and principal shareholders will be exempt from the reporting and short-swing profit recovery provisions contained in Section 16 of the Exchange Act. In addition, we are not be required under the Exchange Act to file periodic reports and financial statements with the SEC as frequently or as promptly as United States companies whose securities are registered under the Exchange Act.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” into this prospectus supplement and the accompanying prospectus the information we have filed with the SEC. This means that we can disclose important information by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be a part of this prospectus supplement, and information that we file later with the SEC will also be deemed to be incorporated by reference into this prospectus supplement and to be a part hereof from the date of filing of such documents and will automatically update and supersede previously filed information, including information contained in this document.

We incorporate by reference into this prospectus supplement the following documents that we have filed with the SEC:

• ourAnnual Report on Form20-F for the fiscal year ended December 31, 2018, filed with the SEC on April 1, 2019;

• our Current Reports on Form6-K furnished to the SEC onJanuary 3, 2019,February 13, 2019,February  22, 2019,March 5, 2019,April  4, 2019,April 9, 2019,May  10, 2019,May 14, 2019,May  24, 2019,June 3, 2019,June  26, 2019,August 1, 2019,August  7, 2019,September 27, 2019,October  4, 2019,October 9, 2019,January  3, 2020,January 9, 2020,January 13, 2020 andJanuary 29, 2020; and

• the description of our ordinary shares contained in ourRegistration Statement on Form8-A, filed with the SEC on October 17, 2014.

We are also incorporating by reference all subsequent annual reports on Form20-F that we file with the SEC and those of our current reports on Form6-K that we furnish to the SEC that we specifically identify in such form as being incorporated by reference into this prospectus supplement after the date hereof and prior to the completion of an offering of securities under this prospectus supplement.

We will furnish without charge to each person, including any beneficial owner, to whom a prospectus supplement and the accompanying prospectus is delivered, on written or oral request, a copy of any or all of the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, including exhibits to these documents. You should direct any requests for documents, either in writing to Corporate Secretary, c/o DBV Technologies S.A.,177-181 Avenue Pierre Brossolette, 92120 Montrouge, France or by telephone at +33 1 55 42 78 78.

You also may access these filings on our website atwww.dbv-technologies.com. We do not incorporate the information on our website into this prospectus supplement or the accompanying prospectus and you should not consider any information on, or that can be accessed through, our website as part of this prospectus supplement or the accompanying prospectus (other than those filings with the SEC that we specifically incorporate by reference into this prospectus supplement).

Any statement contained in a document incorporated or deemed to be incorporated by reference in this prospectus supplement will be deemed modified, superseded or replaced for purposes of this prospectus or any prospectus supplement to the extent that a statement contained in any other subsequently filed document that also is or is deemed to be incorporated by reference in this prospectus or any prospectus supplement modifies, supersedes or replaces such statement. Any statement that is modified or superseded will not constitute a part of this prospectus or prospectus supplement, except as modified or superseded.

S-48

EXPENSES

The following table sets forth the expenses, other than any underwriting commissions or agency fees and other items constituting underwriters’ or agents’ compensation, expected to be incurred by us in connection with a possible offering of securities registered under the registration statement of which this prospectus supplement is a part. All amounts are estimated.

Legal fees and expenses	$	550,000
Accounting fees and expenses		170,000
Printing expenses		20,000
Miscellaneous expenses		250,000
Total	$	990,000

S-49

PROSPECTUS

DBV TECHNOLOGIES S.A.

$300,000,000

Ordinary Shares

Ordinary Shares in the Form of American Depositary Shares

We may offer from time to time the securities described in this prospectus, either individually or in any combination, in one or more offerings at prices and on terms that will be determined at the time of the offering. The aggregate initial offering price of the securities that we may offer and sell under this prospectus will not exceed $300,000,000.

We may offer and sell these securities on a continuous or delayed basis to or through one or more underwriters, dealers and agents, or directly to purchasers. For additional information on the methods of sale, you should refer to the section titled “Plan of Distribution” in this prospectus.

Other than any securities sold in connection with a rights offering, we will only sell securities pursuant to this prospectus for which preferential subscription rights shall have been waived by our shareholders in accordance with French law.

Our ordinary shares may be sold in the form of American Depositary Shares, or ADSs. Each ADS representsone-half of one ordinary share. Our ordinary shares in the form of ADSs are listed on the Nasdaq Global Select Market under the symbol “DBVT.” On September 5, 2019, the last reported sale price of the ADSs on Nasdaq was $9.94 per ADS. Our ordinary shares are traded on Euronext Paris under the symbol “DBV.” On September 5, 2019, the last reported sale price of the ordinary shares on Euronext Paris was €17.85 per share.

This prospectus describes the general terms of the securities we may offer and the general manner in which we may offer these securities. We will provide the specific terms of any offering of securities in one or more supplements to this prospectus. Such prospectus supplements may also add, update or change information contained in this prospectus. You should carefully read this prospectus and the applicable prospectus supplement, together with the documents we incorporate by reference, before you invest. This prospectus may not be used to consummate a sale of securities unless accompanies by the applicable prospectus supplement.

Our principal executive offices are located at177-181 Avenue Pierre Brossolette—92120 Montrouge France and our telephone number is +33 1 55 42 78 78.

INVESTING IN OUR SECURITIES INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD REVIEW CAREFULLY THE RISKS AND UNCERTAINTIES REFERENCED UNDER THE HEADING “RISK FACTORS” ON PAGE 7 OF THIS PROSPECTUS AS WELL AS THOSE CONTAINED IN THE APPLICABLE PROSPECTUS SUPPLEMENT AND ANY RELATED FREE WRITING PROSPECTUS, AND IN THE OTHER DOCUMENTS THAT ARE INCORPORATED BY REFERENCE INTO THIS PROSPECTUS OR THE APPLICABLE PROSPECTUS SUPPLEMENT.

Neither the United States Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or the accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is October 1, 2019.

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS	1
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS	4
ABOUT DBV TECHNOLOGIES S.A.	6
RISK FACTORS	7
USE OF PROCEEDS	8
CAPITALIZATION	8
DESCRIPTION OF SHARE CAPITAL	9
DESCRIPTION OF AMERICAN DEPOSITARY SHARES	28
LIMITATIONS AFFECTING SHAREHOLDERS OF A FRENCH COMPANY	38
PLAN OF DISTRIBUTION	39
ENFORCEMENT OF CIVIL LIABILITIES	41
TAXATION	42
LEGAL MATTERS	43
EXPERTS	43
WHERE YOU CAN FIND MORE INFORMATION	44
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE	45

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the U.S. Securities and Exchange Commission, or the SEC, as a “shelf” registration process.

Under this shelf registration, we may offer our ordinary shares, ordinary shares in the form of ADSs or any combination thereof from time to time in one or more offerings, for an aggregate offering price of up to $300,000,000. This prospectus only provides you with a general description of the securities we may offer. Each time we sell securities described herein, we will provide prospective investors with a supplement to this prospectus that will contain specific information about the terms of that offering, including the specific amounts, prices and terms of the securities offered. The prospectus supplement may also add to, update or change information contained in this prospectus. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement and any related free writing prospectus that we may authorize to be provided to you may also add, update or change information contained in this prospectus or in any documents that we have incorporated by reference into this prospectus. Accordingly, to the extent inconsistent, information in this prospectus is superseded by the information in any prospectus supplement. You should carefully read this prospectus, any applicable prospectus supplement and any related free writing prospectus, together with the information incorporated herein by reference as described under the heading “Incorporation of Certain Information by Reference,” before investing in any of the securities offered.

THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE A SALE OF SECURITIES UNLESS IT IS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.

Unless otherwise indicated or the context otherwise requires, references in this prospectus to “DBV,” “the company,” “our company,” “we,” “us” and “our” refer to DBV Technologies S.A. and our consolidated subsidiary. All references in this prospectus to “$,” “US$,” “U.S.$,” “U.S. dollars,” “dollars” and “USD” mean U.S. dollars and all references to “€” and “euros,” mean euros, unless otherwise noted. Throughout this prospectus, references to ADSs mean ADSs or ordinary shares represented by ADSs, as the case may be.

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find More Information.”

Neither we, nor any agent, underwriter or dealer has authorized any person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus, any applicable prospectus supplement or any related free writing prospectus prepared by or on behalf of us or to which we have referred you. This prospectus, any applicable supplement to this prospectus or any related free writing prospectus do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor do this prospectus, any applicable supplement to this prospectus or any related free writing prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.

You should not assume that the information contained in this prospectus, any applicable prospectus supplement or any related free writing prospectus is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the document incorporated by reference, even though this prospectus, any applicable prospectus supplement or any related free writing prospectus is delivered, or securities are sold, on a later date.

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For investors outside the United States: We have not done anything that would permit the offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the securities described herein and the distribution of this prospectus outside the United States.

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TRADEMARKS

We own various trademark registrations and applications, and unregistered trademarks and servicemarks, including “Viaskin^®,” “EPIT^®,” “DBV Technologies^®,” “Abyldis^®” and our corporate logo. All other trademarks or trade names referred to in this prospectus and any prospectus supplement are the property of their respective owners. Trade names, trademarks and service marks of other companies appearing in this prospectus or any prospectus supplement are the property of their respective holders. Solely for convenience, the trademarks and trade names in this prospectus or any prospectus supplement may be referred to without the^® and^™ symbols, but such references should not be construed as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their rights thereto. We do not intend to use or display other companies’ trademarks and trade names to imply a relationship with, or endorsement or sponsorship of us by, any other companies.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Exchange Act of 1934, as amended, or the Exchange Act, that involve a number of risks and uncertainties. Although our forward-looking statements reflect the good faith judgment of our management, these statements can only be based on facts and factors currently known by us. Consequently, these forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from results and outcomes discussed in the forward-looking statements.

All statements other than present and historical facts and conditions contained in this prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement including statements regarding our future results of operations and financial positions, business strategy, plans and our objectives for future operations, are forward-looking statements. The words “anticipate,” “believe,” “can,” “could,” “estimate,” “expect,” “intend,” “is designed to,” “may,” “might,” “plan,” “potential,” “predict,” “objective,” “should,” or the negative of these and similar expressions identify forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

• the timing or likelihood of regulatory filings and approvals, including with respect to our submission of a Biologics License Application to the U.S. Food and Drug Administration for Viaskin Peanut in August 2019;

• our ability to continue as a going concern;

• the initiation, timing, progress and results of ourpre-clinical studies and clinical trials, and our research and development programs;

• our ability to advance product candidates into, and successfully complete, clinical trials;

• our ability to advance our Viaskin manufacturing capabilities, manufacture clinical and commercial supplies of our product candidates and comply with regulatory requirements related to the manufacturing of our product candidates;

• our ability to develop sales and marketing capabilities;

• the commercialization of our product candidates, if approved;

• the pricing and reimbursement of our product candidates, if approved;

• the implementation of our business model, strategic plans for our business, product candidates and technology;

• the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology;

• estimates of our expenses, future revenues, capital requirements and our needs for additional financing;

• the potential benefits of strategic collaboration agreements and our ability to enter into strategic arrangements;

• our ability to maintain and establish collaborations or obtain additional grant funding;

• the rate and degree of market acceptance of our product candidates, if approved by regulatory authorities;

• our financial performance;

• developments relating to our competitors and our industry, including competing therapies; and

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• other risks and uncertainties, including those listed under the caption “Risk Factors” in this prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement.

As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

You should read this prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

This prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement may contain market data and industry forecasts that were obtained from industry publications. These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. While we believe the market position, market opportunity and market size information included in this prospectus, any prospectus supplement and the information incorporated by reference in this prospectus and any prospectus supplement is generally reliable, such information is inherently imprecise.

5

ABOUT DBV TECHNOLOGIES S.A.

We are a clinical-stage specialty biopharmaceutical company focused on changing the field of immunotherapy by developing a novel technology platform called Viaskin. Our therapeutic approach is based on epicutaneous immunotherapy, or EPIT, our proprietary method of delivering biologically active compounds to the immune system through intact skin using Viaskin. We have generated significant data demonstrating that Viaskin’s mechanism of action is novel and differentiated as it targets specific antigen-presenting immune cells in the skin, called Langerhans cells, which capture the antigen and migrate to the lymph node in order to activate the immune system without allowing passage of the antigen into the bloodstream, minimizing systemic exposure in the body. We are advancing this unique technology to address areas of unmet medical need, including in patients suffering from food allergies, for whom safety is paramount as the introduction of the offending allergen into their bloodstream can cause severe or life-threatening allergic reactions, such as anaphylactic shock.

Our legal and commercial name is DBV Technologies S.A. We were incorporated as asociété par actions simplifiée (S.A.S.) under the laws of the French Republic on March 29, 2002 for a period of 99 years and subsequently converted on March 13, 2003 into asociété anonyme. We are registered at the Nanterre Commerce and Companies Register under the number 441 772 522. Our principal executive offices are located at177-181 Avenue Pierre Brossolette—92120 Montrouge France and our telephone number is +33 1 55 42 78 78. Our agent for service of process in the United States is Cogency Global Inc. We maintain a corporate website atwww.dbv-technologies.com. Information contained on, or that can be accessed through, our website does not constitute a part of this prospectus. We have included our website address in this prospectus solely as an inactive textual reference.

Our ordinary shares in the form of ADSs have been listed on the Nasdaq Global Select Market under the symbol “DBVT” since October 22, 2014. Our ordinary shares have been trading on Euronext Paris under the symbol “DBV” since March 28, 2012.

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RISK FACTORS

An investment in our securities involves a high degree of risk. Before deciding whether to purchase our securities, you should carefully consider the risk factors incorporated by reference from Part I, Item 3.D. of our most recentAnnual Report on Form20-F and the other information contained in this prospectus or any applicable prospectus supplement, as updated by those subsequent filings with the SEC under the Exchange Act, that are incorporated herein by reference. These risks could materially affect our business, results of operations or financial condition and cause the value of our securities to decline, in which case you may lose all or part of your investment. For more information, see “Where You Can Find More Information” and “Incorporation of Certain Information by Reference.”

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USE OF PROCEEDS

Unless otherwise set forth in a prospectus supplement, we currently intend to use the net proceeds of any offering of securities for working capital and other general corporate purposes. Accordingly, we will have significant discretion in the use of any net proceeds. We may provide additional information on the use of the net proceeds from the sale of the offered securities in an applicable prospectus supplement relating to the offered securities.

CAPITALIZATION

We intend to include information about our capitalization and indebtedness in prospectus supplements.

8

DESCRIPTION OF SHARE CAPITAL

The following description of our share capital summarizes certain provisions of ourby-laws. Such summaries do not purport to be complete and are subject to, and are qualified in their entirety by reference to, all of the provisions of ourby-laws, a copy of which has been filed with the SEC.

General

As of December 31, 2018, our outstanding share capital consisted of a total of 30,157,777 issued ordinary shares, fully paid and with a nominal value €0.10 per share. As of August 31, 2019, our outstanding share capital consisted of a total of 36,157,777 issued ordinary shares, fully paid and with a nominal value €0.10 per share. We have no preferred shares outstanding.

Under French law, ourby-laws set forth only our issued and outstanding share capital as of the date of theby-laws. Our fully diluted share capital represents all issued and outstanding shares, as well as all potential shares which may be issued upon exercise of outstanding employee warrants, employee share options andnon-employee warrants, as approved by our shareholders and granted by our board of directors.

Reconciliation of the Number of Ordinary Shares Outstanding through August 31, 2019

Shares outstanding at December 31, 2017	24,990,822
Number of shares issued in connection with March 2018 Global offering	4,056,914
Number of ordinary shares issued in connection with the exercise of employee warrants, share options andnon-employee warrants and the acquisition of free shares	1,110,041
Shares outstanding at December 31, 2018	30,157,777
Number of shares issued in connection with April 2019 Global offering	6,000,000
Number of ordinary shares issued in connection with the exercise of employee warrants, share options andnon-employee warrants and the acquisition of free shares	—
Shares outstanding at August 31, 2019	36,157,777

Shareholder Authorizations Regarding Share Capital

At our 2019 combined shareholders’ meeting held on May 24, 2019, our board of directors received the following authorizations from shareholders:

• authorization tobuy-back up to 5% of our shares (such authorization being capped to a maximum potential dilution equal to 5% of our share capital at the date of the relevantbuy-back) for a duration of 18 months (of which 30,281 shares have been bought back as of August 31, 2019);

• authorization to cancel the shares bought back by the company up to 5% of our shares (such authorization being capped to a maximum of 5% of our share capital at the date of the relevant cancellation decision) and to decrease our share capital accordingly, for a duration of 24 months (of which no shares have been canceled as of August 31, 2019);

• delegation of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company), with preferential subscription rights, for a duration of 26 months within a maximum aggregate potential dilution of 14,463,110 shares based on the ordinary shares outstanding at August 31, 2019 (such delegation of authority being capped to a maximum potential dilution of 40% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of August 31, 2019);

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• delegations of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company), without preferential subscription rights (except for the rights offering), through public offerings and/or private placements for the maximum duration permitted under French law (26 months) within a maximum aggregate potential dilution of 10,847,333 or 7,231,555 (depending on the delegations) shares based on the ordinary shares outstanding at August 31, 2019 (each delegation of authority has been capped to a maximum potential dilution equal to a percentage of 30% or 20% of our share capital, respectively (depending on the delegations) at the date of the relevant share capital increase) (of which no shares have been issued as of August 31, 2019);

• delegation of authority to increase our share capital by issuing ordinary shares giving access, if applicable, to ordinary shares or the allocation of debt securities (of the company or any group company) and/or securities giving access to ordinary shares (of the company or any group company) without preferential subscription rights, to the benefit of categories of persons meeting certain characteristics, for a duration of 18 months within a maximum potential dilution of 10,847,333 shares based on the ordinary shares outstanding at August 31, 2019 (such delegation of authority being capped to a maximum potential dilution of 30% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of August 31, 2019);

• delegation of authority to issue equity warrants (bons de souscription d’actions, bons de souscription et/ou d’acquisition d’actions nouvelles et/ou existantes) or redeemable equity warrants (bons de souscription et/ou d’acquisition d’actions nouvelles et/ou existantes remboursables) without preferential subscription rights, to the benefit of categories of persons meeting certain characteristics for a maximum duration of 18 months, within a maximum potential dilution of 180,788 shares based on the ordinary shares outstanding at August 31, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 0.5% of our share capital on the date of the shareholders’ meeting) (of which no warrants have been issued as of August 31, 2019, for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such issuances);

• delegation of authority to increase our share capital by issuing ordinary shares and/or securities giving access to our share capital without preferential subscription rights, to the benefit of employees investing in our company saving plan (plan d’épargne entreprise), for a duration of 26 months, within a maximum aggregate potential dilution of 723,155 shares based on the ordinary shares outstanding at August 31, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 2% of our share capital at the date of the relevant share capital increase) (of which no shares have been issued as of August 31, 2019, for which such delegation our shareholders automatically waived their preferential subscription rights with respect to all such issuances);

• authorization to grant free shares (attribution gratuite d’actions) to our employees and/or certain officers until the next general meeting approving the annual accounts to be held in 2020, within a maximum potential dilution of 723,155 shares based on the ordinary shares outstanding at August 31, 2019 (such authorization being capped to a maximum potential dilution equal to 2% of our share capital at the date of the shareholders’ meeting) (of which 23,750 free shares have been granted but no shares have been issued as of August 31, 2019, for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such grants); and

• authorization to grant share options (options de souscription et/ou d’achat d’actions) to our employees and/or certain officers for a maximum duration of 18 months, within a maximum potential dilution of 2,711,833 shares based on the ordinary shares outstanding at August 31, 2019 (such delegation of authority being capped to a maximum potential dilution equal to 7.5% of our share capital at the date of the shareholders’ meeting) (of which 635,600 share options have been granted but no shares have been issued as of August 31, 2019 for which delegation our shareholders waived automatically their preferential subscription rights with respect to all such grants).

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Key Provisions of OurBy-laws and French Law Affecting Our Ordinary Shares

The description below reflects the terms of ourby-laws, and summarizes the material rights of holders of our ordinary shares under French law. Please note that this is only a summary and is not intended to be exhaustive. For further information, please refer to the full version of ourby-laws.

Corporate Purpose (Article 4 of theBy-laws)

Our corporate purpose in France and abroad includes:

• the development of any innovative medical product, and in particular any drug, diagnostic, or care product;

• the study, research, development, industrial manufacture, and marketing of such products; and

• the use and the development of all patents or any licenses relating to these products, and generally, all commercial transactions, moveable or immoveable, financial or otherwise, directly or indirectly related, in whole or in part, to the company’s objective or any other similar or related objective, which may facilitate operation and business development.

Directors

Directors’ Designation. Directors are designated at a shareholders’ ordinary general meeting, by a simple majority vote of the shareholders present and voting at the meeting in person or by proxy, for a period of two years that expires at the end of the shareholders’ general meeting convened to approve the financial statements for the past fiscal year and held in the year during which the respective director’s term expires.

Vacancies on the Board of Directors. Under French law, vacancies on the board of directors resulting from death or a resignation, provided that at least three directors remain in office, may be filled by a majority of the remaining directors pending ratification by the shareholders by the next shareholders’ meeting.

Quorum and Voting (Article 11 of theBy-laws).The board of directors can only deliberate if at least half of the directors attend the meeting in the manners provided for in ourby-laws. French law and the rules of procedure of the board allow directors to attend meetings of the board of directors in person or, to the extent permitted by applicable law, by videoconference or other telecommunications arrangements. Decisions of the board of directors are taken by the majority of the voting rights held by the directors present or represented.

Directors’ Voting Powers on Proposal, Arrangement or Contract in which any Director Is Materially Interested.Under French law, any agreement entered into (directly or through an intermediary) between us and any director that is not entered into (1) in the ordinary course of our business and (2) upon standard market terms is subject to the prior authorization of the board of directors (it being specified that the interested director cannot vote on such decision). The same provision applies to agreements between us and another company if one of our directors is the owner or a general partner, manager, director, general manager or member of the executive or supervisory board of the other company, as well as to agreements in which one of our directors has an indirect interest.

Directors’ Compensation.The aggregate amount of attendance fees (jetons de présence) of the board of directors is determined at the shareholders’ annual ordinary general meeting, on the basis of a submission of the board of directors of proposed compensation for the board of directors, following the recommendation of the compensation committee (comité des rémunérations) which is comprised of four directors, of which at least two are independent, to the board. The board of directors then divides this aggregate amount among some or all of its members by a simple majority vote, on the basis of a proposal of the compensation committee.

In addition, the board of directors may grant exceptional compensation (rémunérations exceptionnelles) to individual directors on acase-by-case basis for special and temporary assignments. The board of directors may

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also authorize the reimbursement of reasonable travel and accommodation expenses, as well as other expenses incurred by directors in the corporate interest.

Board of Directors’ Borrowing Powers.There are currently no limits imposed on the amounts of loans or borrowings that the board of directors may approve.

Directors’ Age Limits (Article 10 of theBy-laws).The number of directors who are more than 80 years old may not exceedone-third of the directors in office.

Directors’ Share Ownership Requirements.None.

Rights, Preferences and Restrictions Attaching to Ordinary Shares

Dividends (Article 37 of theBy-laws).We may only distribute dividends out of our “distributable profits,” plus any amounts held in our reserves that the shareholders decide to make available for distribution, other than those reserves that are specifically required by law.

“Distributable Profits” consist of our unconsolidated net profit in each fiscal year, as increased or reduced by any profit or loss carried forward from prior years, less any contributions to the reserve accounts pursuant to French law (see below).

Legal Reserve.Pursuant to French law, we must allocate 5% of our unconsolidated net profit for each year to our legal reserve fund before dividends may be paid with respect to that year. Funds must be allocated until the amount in the legal reserve is equal to 10% of the aggregate par value of the issued and outstanding share capital. This restriction on the payment of dividends also applies to our French subsidiary on an unconsolidated basis.

Approval of Dividends.Pursuant to French law, our board of directors may propose a dividend for approval by the shareholders at the annual ordinary general meeting.

Upon recommendation of our board of directors, our shareholders may decide to allocate all or part of any distributable profits to special or general reserves, to carry them forward to the next fiscal year as retained earnings or to allocate them to the shareholders as dividends. However, dividends may not be distributed when our net assets are or would become as a result of such distribution lower than the amount of the share capital plus the amount of the legal reserves which, under French law, may not be distributed to shareholders (the amount of our share capital which may not be distributed was equal to €3.6 million on August 31, 2019).

Our board of directors may distribute interim dividends after the end of the fiscal year but before the approval of the financial statements for the relevant fiscal year when the interim balance sheet, established during such year and certified by an auditor, reflects that we have earned distributable profits since the close of the last financial year, after recognizing the necessary depreciation and provisions and after deducting prior losses, if any, and the sums to be allocated to reserves, as required by law or theby-laws, and including any retained earnings. The amount of such interim dividends may not exceed the amount of the profit so defined.

Distribution of Dividends.Dividends are distributed to shareholders pro rata according to their respective holdings of shares. In the case of interim dividends, distributions are made to shareholders on the date set by our board of directors during the meeting in which the distribution of interim dividends is approved. The actual dividend payment date is decided by the shareholders at an ordinary general shareholders’ meeting or by our board of directors in the absence of such a decision by the shareholders. Shareholders that own shares on the actual payment date are entitled to the dividend.

Dividends may be paid in cash or, if the shareholders’ meeting so decides, in kind, provided that all shareholders receive a whole number of assets of the same nature paid in lieu of cash.

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Timing of Payment.Pursuant to French law, dividends must be paid within a maximum of nine months after the close of the relevant fiscal year, unless extended by court order. Dividends not claimed within five years after the payment date shall be deemed to expire and revert to the French state.

Voting Rights (Article 33 of theBy-laws).Each share shall entitle its holder to vote and be represented in the shareholders’ meetings in accordance with the provisions of French law and of ourby-laws. Ownership of one share implies, ipso jure, adherence to ourby-laws and the decisions of the shareholders’ meeting.

In general, each shareholder is entitled to one vote per share at any general shareholders’ meeting. Pursuant to Law no.2014-384 of March 29, 2014, as of April 2016, double voting rights are granted to the shares being registered, unless theby-laws are modified in order to provide otherwise. Ourby-laws (Article 23 of theby-laws) were amended by the general meeting dated June 23, 2015 in order to expressly prohibit the use of double voting rights following the modification of the provisions of Article L.225-123 of the French Commercial Code by Law no.2014-384 of March 29, 2014. As a consequence, each shareholder is entitled to one vote per share at any general shareholders’ meeting.

Under French law, treasury shares or shares held by entities controlled by us are not entitled to voting rights and do not count for quorum purposes.

Rights to Share in Our Profit.Each ordinary share entitles its holder to a portion of the corporate profits and assets proportional to the amount of share capital represented thereby.

Rights to Share in the Surplus in the Event of Liquidation (Article 38 of theBy-laws).If we are liquidated, any assets remaining after payment of the debts, liquidation expenses and all of the remaining obligations will first be used to repay in full the par value of our shares. Any surplus will be distributed pro rata among shareholders in proportion to the number of shares respectively held by them, taking into account, where applicable, of the rights attached to shares of different classes.

Repurchase and Redemption of Shares.Under French law, we may acquire our own shares for the following purposes only:

• to decrease our share capital, provided that such a decision is not driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the shareholders at an extraordinary general meeting; in this case, the shares repurchased must be cancelled within one month from the expiry of the purchase offer;

• to provide shares for distribution to employees or managers under a profit-sharing, free share or share option plan; in this case the shares repurchased must be distributed within 12 months from their repurchase failing which they must be cancelled; or

• under abuy-back program to be authorized by the shareholders in accordance with the provisions of Article L. 225—209 of the French Commercial Code and in accordance with Regulation (EU) No 596/2014 of the European Parliament and of the Council of April 16, 2014 on market abuse, Commission Delegated Regulation (EU) 2016/1052 of March 8, 2016, and the general regulations of, and market practices accepted by theAutorité des marchés financiers, or the AMF.

No such repurchase of shares may result in us holding, directly or through a person acting on our behalf, more than 10% of our issued share capital. Shares repurchased by us continue to be deemed “issued” under French law but are not entitled to dividends or voting rights so long as we hold them directly or indirectly, and we may not exercise the preemptive rights attached to them.

Sinking Fund Provisions.Ourby-laws do not provide for any sinking fund provisions.

Liability to Further Capital Calls.Shareholders are liable for corporate liabilities only up to the par value of the shares they hold; they are not liable to further capital calls.

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Requirements for Holdings Exceeding Certain Percentages.None except as described under the section of this prospectus titled “—Form, Holding and Transfer of Shares—Ownership of Shares byNon-French Persons.”

Actions Necessary to Modify Shareholders’ Rights

Shareholders’ rights may be modified as allowed by French law. Only the extraordinary shareholders’ meeting is authorized to amend any and all provisions of ourby-laws. It may not, however, increase shareholder commitments without the prior approval of each shareholder.

Special Voting Rights of Warrant Holders

Under French law, the holders of warrants of the same class (i.e., warrants that were issued at the same time and with the same rights), including founders’ warrants, are entitled to vote as a separate class at a general meeting of that class of warrant holders under certain circumstances, principally in connection with any proposed modification of the terms and conditions of the class of warrants or any proposed issuance of preferred shares or any modification of the rights of any outstanding class or series of preferred shares.

Rules for Admission to and Calling Annual Shareholders’ Meetings and Extraordinary Shareholders’ Meetings

Access to, Participation in and Voting Rights at Shareholders’ Meetings (Articles 20 & 21 of theBy-laws).Shareholders’ meetings are composed of all shareholders. Each shareholder has the right to attend the meetings and participate in the discussions (1) personally, or (2) by granting proxy to any individual or legal entity of his choosing; or (3) by sending a proxy to the company without indication of the mandate, or (4) by voting by correspondence, or (5) by videoconference or another means of telecommunication in accordance with applicable laws that allow identification. The board of directors organizes, in accordance with legal and regulatory requirements, the participation and vote of these shareholders at the meeting, assuring, in particular, the effectiveness of the means of identification.

Participation in shareholders’ general meetings, in any form whatsoever, is subject to registration or registration of shares under the conditions and time limits provided for applicable laws.

The final date for returning voting ballots by correspondence is set by the board of directors and disclosed in the notice of meeting published in the French Journal of Mandatory Statutory Notices (Bulletin des Annonces Légales Obligatoires (BALO)). This date cannot be earlier than three days prior to the meeting.

The shareholder having voted by correspondence will no longer be able to participate directly in the meeting or to be represented. In the case of returning the proxy form and the voting by correspondence form, the proxy form is taken into account, subject to the votes cast in the voting by correspondence form.

Any shareholder may be represented at meetings by any individual or legal entity of his choosing, by means of a proxy form which is addressed to him by us (1) at his request, addressed to us by any means. This request must be received at the registered office at least five days before the date of the meeting; or (2) at our initiative.

The proxy is only valid for a single meeting or for successive meetings convened with the same agenda. It can also be granted for two meetings, one ordinary, the other extraordinary, held on the same day or within a period of fifteen days.

Any shareholder may vote by correspondence by means of a voting form, which is sent by us (1) upon request, addressed in writing (this request must be received at the registered office at least six days before the date of the meeting); or (2) at our initiative; or (3) in appendix to a proxy voting form under the conditions provided for by current laws and requirements. In any case this voting form is available on our website at least 21 days before the date of the meeting.

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The voting by correspondence form addressed by a shareholder is only valid for a single meeting or for successive meetings convened with the same agenda.

To better understand the voting rights of the ADSs, you should carefully read the section in this prospectus titled “Description of American Depositary Shares—Voting Rights.”

Notice of Annual Shareholders’ Meetings.Shareholders’ meetings are convened by our board of directors, or, failing that, by the statutory auditors, or by a court appointed agent or liquidator in certain circumstances. Meetings are held at our registered offices or at any other location indicated in the convening notice. A convening notice is published in the French Journal of Mandatory Statutory Notices (Bulletin des Annonces Légales Obligatoires (BALO)) at least 35 days prior to a meeting, as well as on our website at least 21 days prior to the meeting. In addition to the particulars relative to the company, it indicates, notably, the meeting’s agenda and the draft resolutions that will be presented. The requests for recording of issues or draft resolutions on the agenda must be addressed to the company under the conditions provided for in the current legislation.

Subject to special legal provisions, the meeting notice is sent out at least fifteen days prior to the date of the meeting, by means of a notice inserted both in a legal announcement bulletin of the registered office department and in the French Journal of Mandatory Statutory Notices (Bulletin des Annonces Légales Obligatoires (BALO)). Further, the holders of registered shares for at least a month at the time of the latest of the insertions of the notice of meeting shall be summoned individually, by regular letter (or by registered letter if they request it and include an advance of expenses) sent to their last known address. This notice may also be transmitted by electronic means of telecommunication, in lieu of any such mailing, to any shareholder requesting it beforehand by registered letter with acknowledgment of receipt in accordance with legal and regulatory requirements, specifying hise-mail address. The latter may at any time expressly request by registered letter to the company with acknowledgment of receipt that the aforementioned means of telecommunication should be replaced in the future by a mailing.

The convening notice must also indicate the conditions under which the shareholders may vote by correspondence and the places and conditions in which they can obtain voting forms by mail.

The convening notice may be addressed, where appropriate, with a proxy form and a voting by correspondence form, under the conditions specified in ourby-laws, or with a voting by correspondence form alone, under the conditions specified in ourby-laws. When the shareholders’ meeting cannot deliberate due to the lack of the required quorum, the second meeting must be called at least ten days in advance in the same manner as used for the first notice.

Agenda and Conduct of Annual Shareholders’ Meetings.The agenda of the shareholders’ meeting shall appear in the notice to convene the meeting and is set by the author of the notice. The shareholders’ meeting may only deliberate on the items on the agenda except for the removal of directors and the appointment of their successors which may be put to vote by any shareholder during any shareholders’ meeting. One or more shareholders representing a percentage of share capital required by French law (currently at 5%), and acting in accordance with legal requirements and within applicable time limits, may request the inclusion of items or proposed resolutions on the agenda.

Shareholders’ meetings shall be chaired by the Chairman of the board of directors or, in his or her absence, the meeting itself shall elect a Chairman. Vote counting shall be performed by the two members of the meeting who are present and accept such duties, who represent, either on their own behalf or as proxies, the greatest number of votes.

Ordinary Shareholders’ Meeting.Ordinary shareholders’ meetings are those meetings called to make any and all decisions that do not amend ourby-laws. An ordinary meeting shall be convened at least once a year within six months of the end of each fiscal year in order to approve the annual and consolidated accounts for the relevant

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fiscal year or, in case of postponement, within the period established by court order. Upon first notice, the meeting may validly deliberate only if the shareholders present or represented by proxy or voting by mail represent at leastone-fifth of the shares entitled to vote. Upon second notice, no quorum is required. Decisions are made by a majority of the votes held by the shareholders present, or represented by proxy, or voting by mail. Abstentions will have the same effect of a “no” vote.

Extraordinary Shareholders’ Meeting.Only an extraordinary shareholders’ meeting is authorized to amend ourby-laws. It may not, however, increase shareholder commitments without the approval of each shareholder. Subject to the legal provisions governing share capital increases from reserves, profits or share premiums, the resolutions of the extraordinary meeting shall be valid only if the shareholders present, represented by proxy or voting by mail represent at leastone-fifth of all shares entitled to vote upon first notice, it being specified that, upon second notice, no quorum is required as long as the original agenda is not modified. If the latter quorum is not reached, the second meeting may be postponed to a date no later than two months after the date for which it was initially called. Decisions are made by atwo-thirds majority of the votes held by the shareholders present, represented by proxy, or voting by mail. Abstentions will have the same effect of a “no” vote.

Provisions Having the Effect of Delaying, Deferring or Preventing a Change in Control of the Company

Provisions contained in ourby-laws and the corporate laws of France, the country in which we are incorporated, could make it more difficult for a third-party to acquire us, even if doing so might be beneficial to our shareholders. These provisions include the following:

• a merger (i.e., in a French law context, a stock for stock exchange following which our company would be dissolved into the acquiring entity and our shareholders would become shareholders of the acquiring entity) of our company into a company incorporated in the European Union would require the approval of our board of directors as well as atwo-thirds majority of the votes held by the shareholders present, represented by proxy or voting by mail at the relevant meeting;

• a merger of our company into a company incorporated outside of the European Union would require 100% of our shareholders to approve it;

• under French law, a cash merger is treated as a share purchase and would require the consent of each participating shareholder;

• our shareholders have granted and may grant in the future our board of directors broad authorizations to increase our share capital or to issue additional ordinary shares or other securities (for example, warrants) to our shareholders, the public or qualified investors, including as a possible defense following the launching of a tender offer for our shares;

• our shareholders have preferential subscription rights on a pro rata basis on the issuance by us of any additional securities for cash or aset-off of cash debts, which rights may only be waived by the extraordinary general meeting (by atwo-thirds majority vote) of our shareholders or on an individual basis by each shareholder;

• our board of directors has the right to appoint directors to fill a vacancy created by the resignation or death of a director, subject to the approval by the shareholders of such appointment at the next shareholders’ meeting, which prevents shareholders from having the sole right to fill vacancies on our board of directors;

• our board of directors can only be convened by its chairman or, when no board meeting has been held for more than two consecutive months, by directors representing at least one fourth of the total number of directors;

• our board of directors meetings can only be regularly held if at least half of the directors attend either physically or by way of videoconference or teleconference enabling the directors’ identification and ensuring their effective participation in the board’s decisions;

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• the shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice. Shares issued are registered in individual accounts opened by the company or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions;

• under French law, anon-resident of France may have to file an administrative notice with French authorities in connection with a direct or indirect investment in us, as defined by administrative rulings; see the section of this prospectus titled “Limitations Affecting Shareholders of a French Company”;

• approval of at least a majority of the votes held by shareholders present, represented by a proxy, or voting by mail at the relevant ordinary shareholders’ general meeting is required to remove directors with or without cause;

• advance notice is required for nominations to the board of directors or for proposing matters to be acted upon at a shareholders’ meeting, except that a vote to remove and replace a director can be proposed at any shareholders’ meeting without notice;

• theby-laws can be changed in accordance with applicable laws;

• the crossing of certain thresholds has to be disclosed and can impose certain obligations; see the section of this prospectus below titled “Declaration of Crossing of Ownership Thresholds”;

• transfers of shares shall comply with applicable insider trading rules; and

• pursuant to French law, the sections of theby-laws relating to the number of directors and election and removal of a director from office may only be modified by a resolution adopted by at least atwo-thirds majority vote of our shareholders present, represented by a proxy or voting by mail at the meeting.

Declaration of Crossing of Ownership Thresholds

Set forth below is a summary of certain provisions of ourby-laws and of the French Commercial Code applicable to us. This summary is not intended to be a complete description of applicable rules under French law.

Any individual or legal entity referred to in ArticlesL.233-7,L.233-9 andL.223-10 of the French Commercial Code coming to directly or indirectly own, alone or in concert, a number of shares representing a fraction of the company’s capital or voting rights greater or equal to 2.5% or a multiple of this percentage must inform the company of the total number of shares and voting rights and of securities giving access to the capital or voting rights that it owns immediately or over time, by registered letter with request for acknowledgment of receipt addressed to the registered office within a period of four trading days from the crossing of the said holding thresholds.

This obligation also applies under the same conditions when crossing each of the above-mentioned thresholds in a downward direction.

In case of failure to declare, shares or voting rights exceeding the fraction that should have been declared are deprived of voting rights at general meetings of shareholders for any meeting that would be held until the expiry of a period of two years from the date of regularization of the notification in accordance with Article L.233-14 of the Commercial Code, if the failure to declare has been determined and one or several shareholders holding at least 2.5% of the capital make the request recorded in the minutes of the general meeting.

These requirements are without prejudice to the threshold crossing declarations provided for under French law which impose a declaration to us and to the AMF upon crossing of the following thresholds no later than the 4th training day following the crossing: 5%, 10%, 15%, 20%, 25%, 30%, 33.33%, 50%, 66.66%, 90% and 95%.

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Further, any shareholder crossing, alone or acting in concert, the 10%, 15%, 20% or 25% threshold shall file a declaration pursuant to which it shall expose its intention over the following 6 months, including notably whether it intends to continue acquiring shares of the company, it intends to acquire control over the company, its intended strategy for the company.

Further, and subject to certain exemptions, any shareholder crossing, alone or acting in concert, the 30% threshold shall file a mandatory public tender offer. Also, any shareholder holding directly or indirectly a number between 30% and 50% of the capital or voting rights and who, in less than twelve consecutive months, increases his/her/its holding of capital or voting rights by at least 1% company’s capital or voting rights, shall file a mandatory public tender offer.

Changes in Share Capital

Increases in Share Capital.Pursuant to French law, our share capital may be increased only with shareholders’ approval at an extraordinary general shareholders’ meeting following the recommendation of our board of directors. The shareholders may delegate to our board of directors either the authority (délégation de compétence) or the power (délégation de pouvoir) to carry out any increase in share capital.

Increases in our share capital may be effected by:

• issuing additional shares;

• increasing the par value of existing shares;

• creating a new class of equity securities; and

• exercising the rights attached to securities giving access to the share capital.

Increases in share capital by issuing additional securities may be effected through one or a combination of the following:

• in consideration for cash;

• in consideration for assets contributed in kind;

• through an exchange offer;

• by conversion of previously issued debt instruments;

• by capitalization of profits, reserves or share premium; and

• subject to certain conditions, by way of offset against debt incurred by us.

Decisions to increase the share capital through the capitalization of reserves, profits and/or share premium require shareholders’ approval at an extraordinary general shareholders’ meeting, acting under the quorum and majority requirements applicable to ordinary shareholders’ meetings. Increases effected by an increase in the par value of shares require unanimous approval of the shareholders, unless effected by capitalization of reserves, profits or share premium. All other capital increases require shareholders’ approval at an extraordinary general shareholders’ meeting acting under the regular quorum and majority requirements for such meetings.

Reduction in Share Capital.Pursuant to French law, any reduction in our share capital requires shareholders’ approval at an extraordinary general shareholders’ meeting following the recommendation of our board of directors. The share capital may be reduced either by decreasing the par value of the outstanding shares or by reducing the number of outstanding shares. The number of outstanding shares may be reduced by the repurchase and cancellation of shares. Holders of each class of shares must be treated equally unless each affected shareholder agrees otherwise.

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Preferential Subscription Right. According to French law, if we issue additional securities for cash, current shareholders will have preferential subscription rights to these securities on a pro rata basis. Preferential subscription rights entitle the individual or entity that holds them to subscribe pro rata based on the number of shares held by them to the issuance of any securities increasing, or that may result in an increase of, our share capital by means of a cash payment or aset-off of cash debts. The preferential subscription rights are transferable during the subscription period relating to a particular offering.

The preferential subscription rights with respect to any particular offering may be waived at an extraordinary general meeting by atwo-thirds vote of our shareholders or individually by each shareholder. Our board of directors and our independent auditors are required by French law to present reports to the shareholders’ meeting that specifically address any proposal to waive the preferential subscription rights.

In the future, to the extent permitted under French law, we may seek shareholder approval to waive preferential subscription rights at an extraordinary general shareholders’ meeting in order to authorize the board of directors to issue additional shares and/or other securities convertible or exchangeable into shares.

Form, Holding and Transfer of Shares

Form of Shares.The shares are nominative or bearer, if the legislation so permits, according to the shareholder’s choice.

Further, in accordance with applicable laws, we may request at any time from the central depository responsible for holding our shares, the information referred to in Article L.228-2 of the French Commercial Code. Thus, we are, in particular and at any time, entitled to request the name and year of birth or, in the case of a legal entity, the name and the year of incorporation, nationality and address of holders of securities conferring immediate or long-term voting rights at its general meetings of shareholders and the amount of securities owned by each of them and, where applicable, the restrictions that the securities could be affected by.

Holding of Shares.In accordance with French law concerning the “dematerialization” of securities, the ownership rights of shareholders are represented by book entries instead of share certificates. Shares issued are registered in individual accounts opened by us or any authorized intermediary, in the name of each shareholder and kept according to the terms and conditions laid down by the legal and regulatory provisions.

Ownership of Shares byNon-French Persons.Neither French law nor ourby-laws limit the right ofnon-residents of France ornon-French persons to own or, where applicable, to vote our securities.

Assignment and Transfer of Shares.Shares are freely negotiable, subject to applicable legal and regulatory provisions. French law notably provides for standstill obligations and prohibition of insider trading.

Listing

Our ADSs are listed on the Nasdaq Global Select Market under the symbol “DBVT” and our ordinary shares are listed on Euronext Paris under the symbol “DBV.”

Transfer Agent and Registrar

The transfer agent and registrar for our ADSs is Citibank, N.A. The transfer agent and registrar for our ordinary shares is Société Générale Securities Services.

Differences in Corporate Law

The laws applicable to French sociétés anonymes differ from laws applicable to U.S. corporations and their shareholders. Set forth below is a summary of certain differences between the provisions of the French

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Commercial Code applicable to us and the Delaware General Corporation Law relating to shareholders’ rights and protections. This summary is not intended to be a complete discussion of the respective rights and it is qualified in its entirety by reference to Delaware law and French law.

	France	Delaware
Number of Directors	Under French law, asociété anonymemust have at least three and may have up to 18 directors. The number of directors is fixed by or in the manner provided in theby-laws.	Under Delaware law, a corporation must have at least one director and the number of directors shall be fixed by or in the manner provided in theby-laws.
Director Qualifications	Under French law, a corporation may prescribe qualifications for directors under itsby-laws. In addition, under French law, members of a board of directors of a corporation may be legal entities, and such legal entities may designate an individual to represent them and to act on their behalf at meetings of the board of directors.	Under Delaware law, a corporation may prescribe qualifications for directors under its certificate of incorporation orby-laws. Under Delaware law, only individuals may be members of a corporation’s board of directors.
Removal of Directors	Under French law, directors may be removed from office, with or without cause, at any shareholders’ meeting without notice or justification, by a simple majority vote of the shareholders present and voting at the meeting in person or by proxy.	Under Delaware law, unless otherwise provided in the certificate of incorporation, directors may be removed from office, with or without cause, by a majority stockholder vote, though in the case of a corporation whose board is classified, stockholders may effect such removal only for cause.
Vacancies on the Board of Directors	Under French law, vacancies on the board of directors resulting from death or a resignation, provided that at least three directors remain in office, may be filled by a majority of the remaining directors pending ratification by the shareholders by the next shareholders’ meeting.	Under Delaware law, vacancies on a corporation’s board of directors, including those caused by an increase in the number of directors, may be filled by a majority of the remaining directors.
Annual General Meeting	Under French law, the annual general meeting of shareholders shall be held at such place, on such date and at such time as decided each year by the board of directors and notified to the shareholders in the convening notice of the annual meeting, within six months after the close of the relevant fiscal year unless such period is extended by court order.	Under Delaware law, the annual meeting of stockholders shall be held at such place, on such date and at such time as may be designated from time to time by the board of directors or as provided in the certificate of incorporation or by theby-laws.
General Meeting	Under French law, general meetings of the shareholders may be called by the board of directors or, failing that,	Under Delaware law, special meetings of the stockholders may be called by the board of directors or by such

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	France	Delaware
	by the statutory auditors, or by a court appointed agent or liquidator in certain circumstances, or by the majority shareholder in capital or voting rights following a public tender offer or exchange offer or the transfer of a controlling block on the date decided by the board of directors or the relevant person.	person or persons as may be authorized by the certificate of incorporation or by theby-laws.
Notice of General Meetings	A convening notice is published in the French Journal of Mandatory Statutory Notices (Bulletin des Annonces Légales Obligatoires (BALO)) at least 35 days prior to a meeting and made available on the website of the company at leasttwenty-one day prior to the meeting. Subject to special legal provisions, the meeting notice is sent out at least fifteen days prior to the date of the meeting, by means of a notice inserted both in a legal announcement bulletin of the registered office department and in the BALO. Further, the holders of registered shares for at least a month at the time of the latest of the insertions of the notice of meeting shall be summoned individually, by regular letter (or by registered letter if they request it and include an advance of expenses) sent to their last known address. This notice may also be transmitted by electronic means of telecommunication, in lieu of any such mailing, to any shareholder requesting it beforehand by registered letter with acknowledgment of receipt in accordance with legal and regulatory requirements, specifying hise-mail address. The convening notice must also indicate the conditions under which the shareholders may vote by correspondence and the places and conditions in which they can obtain voting forms by mail.	Under Delaware law, unless otherwise provided in the certificate of incorporation orby-laws, written notice of any meeting of the stockholders must be given to each stockholder entitled to vote at the meeting not less than 10 nor more than 60 days before the date of the meeting and shall specify the place, date, hour, and purpose or purposes of the meeting.
Proxy	Each shareholder has the right to attend the meetings and participate in the discussions (i) personally, or (ii)	Under Delaware law, at any meeting of stockholders, a stockholder may designate another person to act for

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	France	Delaware
	by granting proxy to any individual or legal entity of his choosing; or (iii) by sending a proxy to the company without indication of the mandate, or (iv) by voting by correspondence, or (v) by videoconference or another means of telecommunication in accordance with applicable laws that allow identification. The proxy is only valid for a single meeting or for successive meetings convened with the same agenda. It can also be granted for two meetings, one ordinary, the other extraordinary, held on the same day or within a period of fifteen days.	such stockholder by proxy, but no such proxy shall be voted or acted upon after three years from its date, unless the proxy provides for a longer period.
Shareholder Action by Written Consent	Under French law, shareholders’ action by written consent is not permitted in asociété anonyme.	Under Delaware law, a corporation’s certificate of incorporation (1) may permit stockholders to act by written consent if such action is signed by all stockholders, (2) may permit stockholders to act by written consent signed by stockholders having the minimum number of votes that would be necessary to take such action at a meeting or (3) may prohibit actions by written consent.
Preemptive Rights	Under French law, in case of issuance of additional shares or other securities for cash orset-off against cash debts, the existing shareholders have preferential subscription rights to these securities on a pro rata basis unless such rights are waived by atwo-thirds majority of the votes held by the shareholders present at the extraordinary meeting deciding or authorizing the capital increase, voting in person or represented by proxy or voting by mail. In case such rights are not waived by the extraordinary general meeting, each stockholder may individually either exercise, assign or not exercise its preferential rights.	Under Delaware law, unless otherwise provided in a corporation’s certificate of incorporation, a stockholder does not, by operation of law, possess preemptive rights to subscribe to additional issuances of the corporation’s stock.
Sources of Dividends	Under French law, dividends may only be paid by a Frenchsociété anonyme out of “distributable profits,” plus any distributable	Under Delaware law, dividends may be paid by a Delaware corporation either out of (1) surplus or (2) in case there is no surplus, out of its net

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	France	Delaware
	reserves and “distributable premium” that the shareholders decide to make available for distribution, other than those reserves that are specifically required by law. “Distributable profits” consist of the unconsolidated net profits of the relevant corporation for each fiscal year, as increased or reduced by any profit or loss carried forward from prior years. “Distributable premium” refers to the contribution paid by the stockholders in addition to the par value of their shares for their subscription that the stockholders decide to make available for distribution. Except in case of a share capital reduction, no distribution can be made to the stockholders when the net equity is, or would become, lower than the amount of the share capital plus the reserves which cannot be distributed in accordance with the law orby-laws.	profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year, except when the capital is diminished by depreciation in the value of its property, or by losses, or otherwise, to an amount less than the aggregate amount of capital represented by issued and outstanding stock having a preference on the distribution of assets.
Repurchase of Shares	Under French law, a corporation may acquire its own shares for the following purposes only: •  to decrease its share capital, provided that such decision is not driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the shareholders at the extraordinary general meeting deciding the capital reduction; •  with a view to distributing within one year of their repurchase the relevant shares to employees or managers under a profit-sharing, free share or share option plan; or	Under Delaware law, a corporation may generally redeem or repurchase shares of its stock unless the capital of the corporation is impaired or such redemption or repurchase would impair the capital of the corporation.
	•  with a view to distributing within one year of their repurchase the relevant shares to employees or managers under a profit-sharing, free share or share option plan; or

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	France	Delaware
	•  under abuy-back program to be authorized by the shareholders in accordance with the provisions of Article L. 225—209 of the French Commercial Code, in accordance with Regulation (EU) No 596/2014 of the European Parliament and of the Council of April 16, 2014 on market abuse, Commission Delegated Regulation (EU) 2016/1052 of March 8, 2016, and in accordance with the general regulations of the AMF.
	No such repurchase of shares may result in the company holding, directly or through a person acting on its behalf, more than 10% of its issued share capital.
Liability of Directors and Officers	Under French law, theby-laws may not include any provisions limiting the liability of directors.	Under Delaware law, a corporation’s certificate of incorporation may include a provision eliminating or limiting the personal liability of a director to the corporation and its stockholders for damages arising from a breach of fiduciary duty as a director. However, no provision can limit the liability of a director for:
		•  any breach of the director’s duty of loyalty to the corporation or its stockholders;
		•  acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law;
		•  intentional or negligent payment of unlawful dividends or stock purchases or redemptions; or
		•  any transaction from which the director derives an improper personal benefit.
Voting Rights	French law provides that, unless otherwise provided in theby-laws, each shareholder is entitled to one vote for each share of capital stock held by such shareholder. Further to the introduction of LawNo. 2014-384	Delaware law provides that, unless otherwise provided in the certificate of incorporation, each stockholder is entitled to one vote for each share of capital stock held by such stockholder.

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	France	Delaware
	dated March 29, 2014 (Loi Florange), shares registered under a shareholder’s name for more than two years shall automatically be granted double voting rights from 2016, unless theby-laws expressly reject this measure.
Shareholder Vote on Certain Transactions	Generally, under French law, completion of a merger, dissolution, sale, lease or exchange of all or substantially all of a corporation’s assets requires: •  the approval of the board of directors; and •  approval by atwo-thirds majority of the votes held by the shareholders present, represented by proxy or •  voting by mail at the relevant meeting or, in the case of a merger with anon-EU company, approval of all shareholders of the corporation.	Generally, under Delaware law, unless the certificate of incorporation provides for the vote of a larger portion of the stock, completion of a merger, consolidation, sale, lease or exchange of all or substantially all of a corporation’s assets or dissolution requires: •  the approval of the board of directors; and •  approval by the vote of the holders of a majority of the outstanding stock or, if the certificate of incorporation provides for more or less than one vote per share, a majority of the votes of the outstanding stock of a corporation entitled to vote on the matter.
Dissent or Dissenters Appraisal Rights	French law does not provide for any such right but provides that a merger is subject to shareholders’ approval by atwo-thirds majority vote as stated above.	Under Delaware law, a holder of shares of any class or series has the right, in specified circumstances, to dissent from a merger or consolidation by demanding payment in cash for the stockholder’s shares equal to the fair value of those shares, as determined by the Delaware Chancery Court in an action timely brought by the corporation or a dissenting stockholder. Delaware law grants these appraisal rights only in the case of mergers or consolidations and not in the case of a sale or transfer of assets or a purchase of assets for stock. Further, no appraisal rights are available for shares of any class or series that is listed on a national securities exchange or held of record by more than 2,000 stockholders, unless the agreement of merger or consolidation requires the holders to

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	France	Delaware
		accept for their shares anything other than:
		•  shares of stock of the surviving corporation;
		•  shares of stock of another corporation that are either listed on a national securities exchange or held of record by more than 2,000 stockholders;
		•  cash in lieu of fractional shares of the stock described in the two preceding bullet points; or
		•  any combination of the above.
		In addition, appraisal rights are not available to holders of shares of the surviving corporation in specified mergers that do not require the vote of the stockholders of the surviving corporation.
Standard of Conduct for Directors	French law does not contain specific provisions setting forth the standard of conduct of a director. However, directors have a duty to act without self-interest, on a well-informed basis and they cannot make any decision against a corporation’s corporate interest (intérêt social).	Delaware law does not contain specific provisions setting forth the standard of conduct of a director. The scope of the fiduciary duties of directors is generally determined by the courts of the State of Delaware. In general, directors have a duty to act without self-interest, on a well- informed basis and in a manner they reasonably believe to be in the best interest of the stockholders.
Shareholder Suits	French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek indemnification from the directors of a corporation in the corporation’s interest if it fails to bring such legal action itself. If so, any damages awarded by the court are paid to the corporation and any legal fees relating to such action are borne by the relevant shareholder or the group of shareholders. The plaintiff must remain a shareholder through the duration of the legal action. There is no other case where shareholders may initiate a derivative action to enforce a right of a corporation.	Under Delaware law, a stockholder may initiate a derivative action to enforce a right of a corporation if the corporation fails to enforce the right itself. The complaint must: •  state that the plaintiff was a stockholder at the time of the transaction of which the plaintiff complains or that the plaintiff’s shares thereafter devolved on the plaintiff by operation of law; and •  allege with particularity the efforts made by the plaintiff to obtain the action the plaintiff desires from the directors and the reasons for the plaintiff’s failure to obtain the action; or •  state the reasons for not making the effort.

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	France	Delaware
	A shareholder may alternatively or cumulatively bring individual legal action against the directors, provided he has suffered distinct damages from those suffered by the corporation. In this case, any damages awarded by the court are paid to the relevant shareholder.	•  Additionally, the plaintiff must remain a stockholder through the duration of the derivative suit. The action will not be dismissed or compromised without the approval of the Delaware Court of Chancery.
Amendment of Certificate of Incorporation	Unlike companies incorporated under Delaware law, which organizational documents are comprised of a certificate of incorporation andby-laws, companies incorporated under French law only haveby-laws (statuts) as organizational documents. As indicated below, only the extraordinary shareholders’ meeting is authorized to adopt or amend theby-laws under French law.	Under Delaware law, generally a corporation may amend its certificate of incorporation if: •  its board of directors has adopted a resolution setting forth the amendment proposed and declared its advisability; and •  the amendment is adopted by the affirmative votes of a majority (or greater percentage as may be specified by the corporation) of the outstanding shares entitled to vote on the amendment and a majority (or greater percentage as may be specified by the corporation) of the outstanding shares of each class or series of stock, if any, entitled to vote on the amendment as a class or series.
Amendment ofBy-laws	Under French law, only the extraordinary shareholders’ meeting is authorized to adopt or amend theby-laws.	Under Delaware law, the stockholders entitled to vote have the power to adopt, amend or repealby-laws. A corporation may also confer, in its certificate of incorporation, that power upon the board of directors.

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DESCRIPTION OF AMERICAN DEPOSITARY SHARES

Citibank, N.A. acts as the depositary for our ADSs. Citibank’s depositary offices are located at 388 Greenwich Street, New York, New York 10013. ADSs represent ownership interests in securities that are on deposit with the depositary. ADSs may be represented by certificates that are commonly known as American Depositary Receipts, or ADRs. The depositary typically appoints a custodian to safekeep the securities on deposit. In this case, the custodian is Citibank International Plc, located at EGSP 186, 1 North Wall Quay, Dublin 1 Ireland.

We have appointed Citibank as depositary pursuant to a deposit agreement. A copy of the deposit agreement is on file with the SEC under cover of a Registration Statement on FormF-6. You may obtain a copy of the deposit agreement from the SEC’s website at www.sec.gov. Please refer to Registration Number333-199231 when retrieving such copy.

We are providing you with a summary description of the material terms of the ADSs and of your material rights as an owner of ADSs. Please remember that summaries by their nature lack the precision of the information summarized and that the rights and obligations of an owner of ADSs will be determined by reference to the terms of the deposit agreement and not by this summary. We urge you to review the deposit agreement in its entirety. Each ADS represents the right to receiveone-half of one ordinary share on deposit with the custodian. An ADS also represents the right to receive any other property received by the depositary or the custodian on behalf of the owner of the ADS but that has not been distributed to the owners of ADSs because of legal restrictions or practical considerations. The custodian, the depositary and their respective nominees will hold all deposited property for the benefit of the holders and beneficial owners of ADSs. The deposited property does not constitute the proprietary assets of the depositary, the custodian or their nominees. Beneficial ownership in the deposited property will under the terms of the deposit agreement be vested in the beneficial owners of the ADSs. The depositary, the custodian and their respective nominees will be the record holders of the deposited property represented by the ADSs for the benefit of the holders and beneficial owners of the corresponding ADSs. Owners of ADSs will be able to exercise beneficial ownership interests in the deposited property only through the registered holders of the ADSs, by the registered holders of the ADSs (on behalf of the applicable ADS owners) only through the depositary, and by the depositary (on behalf of the owners of the corresponding ADSs) directly, or indirectly through the custodian or their respective nominees, in each case upon the terms of the deposit agreement.

If you become an owner of ADSs, you will become a party to the deposit agreement and therefore will be bound to its terms and to the terms of any ADR that represents your ADSs. The deposit agreement and the ADR specify our rights and obligations as well as your rights and obligations as owner of ADSs and those of the depositary. As an ADS holder you appoint the depositary to act on your behalf in certain circumstances. The deposit agreement and the ADRs are governed by New York law. However, our obligations to the holders of ordinary shares will continue to be governed by the laws of France, which may be different from the laws in the United States.

In addition, applicable laws and regulations may require you to satisfy reporting requirements and obtain regulatory approvals in certain circumstances. You are solely responsible for complying with such reporting requirements and obtaining such approvals. Neither the depositary, the custodian, us or any of their or our respective agents or affiliates shall be required to take any actions whatsoever on your behalf to satisfy such reporting requirements or obtain such regulatory approvals under applicable laws and regulations.

As an owner of ADSs, we will not treat you as one of our shareholders and you will not have direct shareholder rights. The depositary will hold on your behalf the shareholder rights attached to the ordinary shares underlying your ADSs. As an owner of ADSs you will be able to exercise the shareholders rights for the ordinary shares represented by your ADSs through the depositary only to the extent contemplated in the deposit agreement. To exercise any shareholder rights not contemplated in the deposit agreement you will, as an ADS owner, need to arrange for the cancellation of your ADSs and become a direct shareholder.

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As an owner of ADSs, you may hold your ADSs either by means of an ADR registered in your name, through a brokerage or safekeeping account, or through an account established by the depositary in your name reflecting the registration of uncertificated ADSs directly on the books of the depositary, commonly referred to as the direct registration system, or DRS. The direct registration system reflects the uncertificated (book-entry) registration of ownership of ADSs by the depositary. Under the direct registration system, ownership of ADSs is evidenced by periodic statements issued by the depositary to the holders of the ADSs. The direct registration system includes automated transfers between the depositary and The Depository Trust Company, or DTC, the central book-entry clearing and settlement system for equity securities in the United States. If you decide to hold your ADSs through your brokerage or safekeeping account, you must rely on the procedures of your broker or bank to assert your rights as ADS owner. Banks and brokers typically hold securities such as the ADSs through clearing and settlement systems such as DTC. The procedures of such clearing and settlement systems may limit your ability to exercise your rights as an owner of ADSs. Please consult with your broker or bank if you have any questions concerning these limitations and procedures. All ADSs held through DTC will be registered in the name of a nominee of DTC. This summary description assumes you have opted to own the ADSs directly by means of an ADS registered in your name and, as such, we will refer to you as the “holder.” When we refer to “you,” we assume the reader owns ADSs and will own ADSs at the relevant time.

Dividends and Distributions

As a holder of ADSs, you generally have the right to receive the distributions we make on the securities deposited with the custodian. Your receipt of these distributions may be limited, however, by practical considerations and legal limitations. Holders of ADSs will receive such distributions under the terms of the deposit agreement in proportion to the number of ADSs held as of a specified record date, after deduction the applicable fees, taxes and expenses.

Distributions of Cash

Whenever we make a cash distribution for the securities on deposit with the custodian, we will deposit the funds with the custodian. Upon receipt of confirmation of the deposit of the requisite funds, the depositary will arrange for the funds to be converted into U.S. dollars and for the distribution of the U.S. dollars to the holders, subject to French laws and regulations.

The conversion into U.S. dollars will take place only if practicable and if the U.S. dollars are transferable to the United States. The depositary will apply the same method for distributing the proceeds of the sale of any property (such as undistributed rights) held by the custodian in respect of securities on deposit.

The distribution of cash will be made net of the fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. The depositary will hold any cash amounts it is unable to distribute in anon-interest bearing account for the benefit of the applicable holders and beneficial owners of ADSs until the distribution can be effected or the funds that the depositary holds must be escheated as unclaimed property in accordance with the laws of the relevant states of the United States.

Distributions of Ordinary Shares

Whenever we make a free distribution of ordinary shares for the securities on deposit with the custodian, we will deposit the applicable number of ordinary shares with the custodian. Upon receipt of confirmation of such deposit, the depositary will either distribute to holders new ADSs representing the ordinary shares deposited or modify theADS-to-ordinary share ratio, in which case each ADS you hold will represent rights and interests in the additional ordinary shares so deposited. Only whole new ADSs will be distributed. Fractional entitlements will be sold and the proceeds of such sale will be distributed as in the case of a cash distribution.

The distribution of new ADSs or the modification of theADS-to-ordinary share ratio upon a distribution of ordinary shares will be made net of the fees, expenses, taxes and governmental charges payable by holders under

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the terms of the deposit agreement. In order to pay such taxes or governmental charges, the depositary may sell all or a portion of the new ordinary shares so distributed.

No such distribution of new ADSs will be made if it would violate a law (i.e., the U.S. securities laws) or if it is not operationally practicable. If the depositary does not distribute new ADSs as described above, it may sell the ordinary shares received upon the terms described in the deposit agreement and will distribute the proceeds of the sale as in the case of a distribution of cash.

Distributions of Rights

Whenever we intend to distribute rights to purchase additional ordinary shares, we will give prior notice to the depositary and we will assist the depositary in determining whether it is lawful and reasonably practicable to distribute rights to purchase additional ADSs to holders.

The depositary will establish procedures to distribute rights to purchase additional ADSs to holders and to enable such holders to exercise such rights if it is lawful and reasonably practicable to make the rights available to holders of ADSs, and if we provide all of the documentation contemplated in the deposit agreement (such as opinions to address the lawfulness of the transaction). You may have to pay fees, expenses, taxes and other governmental charges to subscribe for the new ADSs upon the exercise of your rights. The depositary is not obligated to establish procedures to facilitate the distribution and exercise by holders of rights to purchase new ordinary shares other than in the form of ADSs.

The depositary will notdistribute the rights to you if:

• we do not timely request that the rights be distributed to you or we request that the rights not be distributed to you; or

• we fail to deliver satisfactory documents to the depositary; or

• it is not reasonably practicable to distribute the rights.

The depositary will sell the rights that are not exercised or not distributed if such sale is lawful and reasonably practicable. The proceeds of such sale will be distributed to holders as in the case of a cash distribution. If the depositary is unable to sell the rights, it will allow the rights to lapse.

Elective Distributions

Whenever we intend to distribute a dividend payable at the election of shareholders either in cash or in additional ordinary shares, we will give prior notice thereof to the depositary and will indicate whether we wish the elective distribution to be made available to you. In such case, we will assist the depositary in determining whether such distribution is lawful and reasonably practicable.

The depositary will make the election available to you only if it is reasonably practicable and if we have provided all of the documentation contemplated in the deposit agreement. In such case, the depositary will establish procedures to enable you to elect to receive either cash or additional ADSs, in each case as described in the deposit agreement.

If the election is not made available to you, you will receive either cash or additional ADSs, depending on what a shareholder in France would receive upon failing to make an election, as more fully described in the deposit agreement.

Other Distributions

Whenever we intend to distribute property other than cash, ordinary shares or rights to purchase additional ordinary shares, we will notify the depositary in advance and will indicate whether we wish such distribution to

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be made to you. If so, we will assist the depositary in determining whether such distribution to holders is lawful and reasonably practicable.

If it is reasonably practicable to distribute such property to you and if we provide all of the documentation contemplated in the deposit agreement, the depositary will distribute the property to the holders in a manner it deems practicable.

The distribution will be made net of fees, expenses, taxes and governmental charges payable by holders under the terms of the deposit agreement. In order to pay such taxes and governmental charges, the depositary may sell all or a portion of the property received.

The depositary will notdistribute the property to you and will sell the property if:

• we do not request that the property be distributed to you or if we ask that the property not be distributed to you;

• we do not deliver satisfactory documents to the depositary; or

• the depositary determines that all or a portion of the distribution to you is not reasonably practicable.

The proceeds of such a sale will be distributed to holders as in the case of a cash distribution.

Redemption

Whenever we decide to redeem any of the securities on deposit with the custodian, we will notify the depositary in advance. If it is practicable and if we provide all of the documentation contemplated in the deposit agreement, the depositary will provide notice of the redemption to the holders.

The custodian will be instructed to surrender the ordinary shares being redeemed against payment of the applicable redemption price. The depositary will convert the redemption funds received into U.S. dollars upon the terms of the deposit agreement and will establish procedures to enable holders to receive the net proceeds from the redemption upon surrender of their ADSs to the depositary. You may have to pay fees, expenses, taxes and other governmental charges upon the redemption of your ADSs. If less than all ADSs are being redeemed, the ADSs to be retired will be selected by lot or on apro rata basis, as the depositary may determine.

Changes Affecting Ordinary Shares

The ordinary shares held on deposit for your ADSs may change from time to time. For example, there may be a change in nominal or par value, asplit-up, cancellation, consolidation or reclassification of such ordinary shares or a recapitalization, reorganization, merger, consolidation or sale of assets.

If any such change were to occur, your ADSs would, to the extent permitted by law, represent the right to receive the property received or exchanged in respect of the ordinary shares held on deposit. The depositary may in such circumstances deliver new ADSs to you, amend the deposit agreement, the ADRs and the applicable Registration Statement(s) on FormF-6, call for the exchange of your existing ADSs for new ADSs and take any other actions that are appropriate to reflect as to the ADSs the change affecting the ordinary shares. If the depositary may not lawfully distribute such property to you, the depositary may sell such property and distribute the net proceeds to you as in the case of a cash distribution.

Issuance of ADSs upon Deposit of Ordinary Shares

Upon completion of an offering, the ordinary shares being offered pursuant to this prospectus will be deposited by us with the custodian. Upon receipt of confirmation of such deposit, the depositary will issue ADSs to the underwriters, dealer or other purchaser.

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The depositary may create ADSs on your behalf if you or your broker deposit ordinary shares with the custodian. The depositary will deliver these ADSs to the person you indicate only after you pay any applicable issuance fees and any charges and taxes payable for the transfer of the ordinary shares to the custodian. Your ability to deposit ordinary shares and receive ADSs may be limited by U.S. and French legal considerations applicable at the time of deposit.

The issuance of ADSs may be delayed until the depositary or the custodian receives confirmation that all required approvals have been given and that the ordinary shares have been duly transferred to the custodian. The depositary will only issue ADSs in whole numbers.

When you make a deposit of ordinary shares, you will be responsible for transferring good and valid title to the depositary. As such, you will be deemed to represent and warrant that:

• The ordinary shares are duly authorized, validly issued, fully paid,non-assessable and legally obtained.

• All preemptive (and similar) rights, if any, with respect to such ordinary shares have been validly waived or exercised.

• You are duly authorized to deposit the ordinary shares.

• The ordinary shares presented for deposit are free and clear of any lien, encumbrance, security interest, charge, mortgage or adverse claim, and are not, and the ADSs issuable upon such deposit will not be, “restricted securities” (as defined in the deposit agreement).

• The ordinary shares presented for deposit have not been stripped of any rights or entitlements.

If any of the representations or warranties are incorrect in any way, we and the depositary may, at your cost and expense, take any and all actions necessary to correct the consequences of the misrepresentations.

Transfer, Combination and Split Up of ADRs

As an ADR holder, you will be entitled to transfer, combine or split up your ADRs and the ADSs evidenced thereby. For transfers of ADRs, you will have to surrender the ADRs to be transferred to the depositary and also must:

• ensure that the surrendered ADR is properly endorsed or otherwise in proper form for transfer;

• provide such proof of identity and genuineness of signatures as the depositary deems appropriate;

• provide any transfer stamps required by the State of New York or the United States; and

• pay all applicable fees, charges, expenses, taxes and other government charges payable by ADR holders pursuant to the terms of the deposit agreement, upon the transfer of ADRs.

To have your ADRs either combined or split up, you must surrender the ADRs in question to the depositary with your request to have them combined or split up, and you must pay all applicable fees, charges and expenses payable by ADR holders, pursuant to the terms of the deposit agreement, upon a combination or split up of ADRs.

Withdrawal of Ordinary Shares Upon Cancellation of ADSs

As a holder, you will be entitled to present your ADSs to the depositary for cancellation and then receive the corresponding number of underlying ordinary shares at the custodian’s offices. Your ability to withdraw the ordinary shares may be limited by U.S. and French legal considerations applicable at the time of withdrawal. In order to withdraw the ordinary shares represented by your ADSs, you will be required to pay to the depositary the fees for cancellation of ADSs and any charges and taxes payable upon the transfer of the ordinary shares being withdrawn. You assume the risk for delivery of all funds and securities upon withdrawal. Once canceled, the ADSs will not have any rights under the deposit agreement.

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If you hold ADSs registered in your name, the depositary may ask you to provide proof of identity and genuineness of any signature and such other documents as the depositary may deem appropriate before it will cancel your ADSs. The withdrawal of the ordinary shares represented by your ADSs may be delayed until the depositary receives satisfactory evidence of compliance with all applicable laws and regulations. Please keep in mind that the depositary will only accept ADSs for cancellation that represent a whole number of securities on deposit.

You will have the right to withdraw the securities represented by your ADSs at any time except for:

• temporary delays that may arise because (i) the transfer books for the ordinary shares or ADSs are closed, or (ii) ordinary shares are immobilized on account of a shareholders’ meeting or a payment of dividends;

• obligations to pay fees, taxes and similar charges; or

• restrictions imposed because of laws or regulations applicable to ADSs or the withdrawal of securities on deposit.

The deposit agreement may not be modified to impair your right to withdraw the securities represented by your ADSs except to comply with mandatory provisions of law.

Voting Rights

As a holder, you generally have the right under the deposit agreement to instruct the depositary to exercise the voting rights for the ordinary shares represented by your ADSs. The voting rights of holders of ordinary shares are described in the sections of this prospectus titled “Description of Share Capital” and “Limitations Affecting Shareholders of a French Company.”

At our request, the depositary will distribute to you any notice of shareholders’ meeting received from us together with information explaining how to instruct the depositary to exercise the voting rights of the securities represented by ADSs.

If the depositary timely receives voting instructions from a holder of ADSs, it will endeavor to vote the securities (in person or by proxy) represented by the holder’s ADSs in accordance with such voting instructions.

Please note that the ability of the depositary to carry out voting instructions may be limited by practical and legal limitations and the terms of the securities on deposit. We cannot assure you that you will receive voting materials in time to enable you to return voting instructions to the depositary in a timely manner. Securities for which no voting instructions have been received will not be voted.

Fees and Charges

As an ADS holder, you will be required to pay the following service fees to the depositary:

Service	Fees
•   Issuance of ADSs	Up to U.S. $0.05 per ADS issued
•   Cancellation of ADSs	Up to U.S. $0.05 per ADS canceled
•   Distribution of cash dividends or other cash distributions	Up to U.S. $0.05 per ADS held
•   Distribution of ADSs pursuant to stock dividends, free stock distributions or exercise of rights.	Up to U.S. $0.05 per ADS held
•   Distribution of securities other than ADSs or rights to purchase additional ADSs	Up to U.S. $0.05 per ADS held
•   ADS Services	Up to U.S. $0.05 per ADS held on the applicable record date(s) established by the depositary

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As an ADS holder you will also be responsible to pay certain fees and expenses incurred by the depositary and certain taxes and governmental charges such as:

• fees for the transfer and registration of ordinary shares charged by the registrar and transfer agent for the ordinary shares in France (i.e., upon deposit and withdrawal of ordinary shares);

• expenses incurred for converting foreign currency into U.S. dollars;

• expenses for cable, telex and fax transmissions and for delivery of securities;

• taxes and duties upon the transfer of securities (i.e., when ordinary shares are deposited or withdrawn from deposit); and

• fees and expenses incurred in connection with the delivery or servicing of ordinary shares on deposit.

Depositary fees payable upon the issuance and cancellation of ADSs are typically paid to the depositary by the brokers (on behalf of their clients) receiving the newly issued ADSs from the depositary and by the brokers (on behalf of their clients) delivering the ADSs to the depositary for cancellation. The brokers in turn charge these fees to their clients. Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary to the holders of record of ADSs as of the applicable ADS record date.

The depositary fees payable for cash distributions are generally deducted from the cash being distributed. In the case of distributions other than cash (i.e., stock dividend, rights), the depositary charges the applicable fee to the ADS record date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or uncertificated in direct registration), the depositary sends invoices to the applicable record date ADS holders. In the case of ADSs held in brokerage and custodian accounts (via DTC), the depositary generally collects its fees through the systems provided by DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to the ADS holder.

Note that the fees and charges you may be required to pay may vary over time and may be changed by us and by the depositary. You will receive prior notice of such changes.

The depositary may reimburse us for certain expenses incurred by us in respect of the ADR program established pursuant to the deposit agreement, by making available a portion of the depositary fees charged in respect of the ADR program or otherwise, upon such terms and conditions as we and the depositary may agree from time to time.

Amendments and Termination

We may agree with the depositary to modify the deposit agreement at any time without your consent. We undertake to give holders 30 days’ prior notice of any modifications that would materially prejudice any of their substantial rights under the deposit agreement. We will not consider to be materially prejudicial to your substantial rights any modifications or supplements that are reasonably necessary for the ADSs to be registered under the Securities Act or to be eligible for book-entry settlement, in each case without imposing or increasing the fees and charges you are required to pay. In addition, we may not be able to provide you with prior notice of any modifications or supplements that are required to accommodate compliance with applicable provisions of law.

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You will be bound by the modifications to the deposit agreement if you continue to hold your ADSs after the modifications to the deposit agreement become effective. The deposit agreement cannot be amended to prevent you from withdrawing the ordinary shares represented by your ADSs (except as permitted by law).

We have the right to direct the depositary to terminate the deposit agreement. Similarly, the depositary may in certain circumstances on its own initiative terminate the deposit agreement. In either case, the depositary must give notice to the holders at least 30 days before termination. Until termination, your rights under the deposit agreement will be unaffected.

After termination, the depositary will continue to collect distributions received (but will not distribute any such property until you request the cancellation of your ADSs) and may sell the securities held on deposit. After the sale, the depositary will hold the proceeds from such sale and any other funds then held for the holders of ADSs in anon-interest bearing account. At that point, the depositary will have no further obligations to holders other than to account for the funds then held for the holders of ADSs still outstanding (after deduction of applicable fees, taxes and expenses).

Books of Depositary

The depositary will maintain ADS holder records at its depositary office. You may inspect such records at such office during regular business hours but solely for the purpose of communicating with other holders in the interest of business matters relating to the ADSs and the deposit agreement.

The depositary will maintain in New York facilities to record and process the issuance, cancellation, combination,split-up and transfer of ADSs. These facilities may be closed from time to time, to the extent not prohibited by law.

Limitations on Obligations and Liabilities

The deposit agreement limits our obligations and the depositary’s obligations to you. Please note the following:

• We and the depositary are obligated only to take the actions specifically stated in the deposit agreement without negligence or bad faith.

• The depositary disclaims any liability for any failure to carry out voting instructions, for any manner in which a vote is cast or for the effect of any vote, provided it acts in good faith and in accordance with the terms of the deposit agreement.

• The depositary disclaims any liability for any failure to determine the lawfulness or practicality of any action, for the content of any document forwarded to you on our behalf or for the accuracy of any translation of such a document, for the investment risks associated with investing in ordinary shares, for the validity or worth of the ordinary shares, for any tax consequences that result from the ownership of ADSs, for the credit-worthiness of any third party, for allowing any rights to lapse under the terms of the deposit agreement, for the timeliness of any of our notices or for our failure to give notice.

• We and the depositary will not be obligated to perform any act that is inconsistent with the terms of the deposit agreement.

• We and the depositary disclaim any liability if we or the depositary are prevented or forbidden from or subject to any civil or criminal penalty or restraint on account of, or delayed in, doing or performing any act or thing required by the terms of the deposit agreement, by reason of any provision, present or future of any law or regulation, or by reason of present or future provision of any provision of our Articles of Incorporation, or any provision of or governing the securities on deposit, or by reason of any act of God or war or other circumstances beyond our control.

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• We and the depositary disclaim any liability by reason of any exercise of, or failure to exercise, any discretion provided for in the deposit agreement or in our Articles of Incorporation or in any provisions of or governing the securities on deposit.

• We and the depositary further disclaim any liability for any action or inaction in reliance on the advice or information received from legal counsel, accountants, any person presenting ordinary shares for deposit, any holder of ADSs or authorized representatives thereof, or any other person believed by either of us in good faith to be competent to give such advice or information.

• We and the depositary also disclaim liability for the inability by a holder to benefit from any distribution, offering, right or other benefit that is made available to holders of ordinary shares but is not, under the terms of the deposit agreement, made available to you.

• We and the depositary may rely without any liability upon any written notice, request or other document believed to be genuine and to have been signed or presented by the proper parties.

• We and the depositary also disclaim liability for any consequential or punitive damages for any breach of the terms of the deposit agreement.

• No disclaimer of any Securities Act liability is intended by any provision of the deposit agreement.

Pre-Release Transactions

Subject to the terms and conditions of the deposit agreement, the depositary may issue to broker/dealers ADSs before receiving a deposit of ordinary shares or release ordinary shares to broker/dealers before receiving ADSs for cancellation. These transactions are commonly referred to as“pre-release transactions,” and are entered into between the depositary and the applicable broker/dealer. The deposit agreement limits the aggregate size ofpre-release transactions (not to exceed 30% of the ordinary shares on deposit in the aggregate) and imposes a number of conditions on such transactions (i.e., the need to receive collateral, the type of collateral required, the representations required from brokers, etc.). The depositary may retain the compensation received from thepre-release transactions.

Taxes

You will be responsible for the taxes and other governmental charges payable on the ADSs and the securities represented by the ADSs. We, the depositary and the custodian may deduct from any distribution the taxes and governmental charges payable by holders and may sell any and all property on deposit to pay the taxes and governmental charges payable by holders. You will be liable for any deficiency if the sale proceeds do not cover the taxes that are due.

The depositary may refuse to issue ADSs, to deliver, transfer, split and combine ADRs or to release securities on deposit until all taxes and charges are paid by the applicable holder. The depositary and the custodian may take reasonable administrative actions to obtain tax refunds and reduced tax withholding for any distributions on your behalf. However, you may be required to provide to the depositary and to the custodian proof of taxpayer status and residence and such other information as the depositary and the custodian may require to fulfill legal obligations. You are required to indemnify us, the depositary and the custodian for any claims with respect to taxes based on any tax benefit obtained for you.

Foreign Currency Conversion

The depositary will arrange for the conversion of all foreign currency received into U.S. dollars if such conversion is practical, and it will distribute the U.S. dollars in accordance with the terms of the deposit agreement. You may have to pay fees and expenses incurred in converting foreign currency, such as fees and expenses incurred in complying with currency exchange controls and other governmental requirements.

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If the conversion of foreign currency is not practical or lawful, or if any required approvals are denied or not obtainable at a reasonable cost or within a reasonable period, the depositary may take the following actions in its discretion:

• convert the foreign currency to the extent practical and lawful and distribute the U.S. dollars to the holders for whom the conversion and distribution is lawful and practical;

• distribute the foreign currency to holders for whom the distribution is lawful and practical; and

• hold the foreign currency (without liability for interest) for the applicable holders.

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LIMITATIONS AFFECTING SHAREHOLDERS OF A FRENCH COMPANY

Ownership of ADSs or Shares byNon-French Residents

Neither the French Commercial Code nor ourby-laws presently impose any restrictions on the right ofnon- French residents ornon-French shareholders to own and vote shares.

Foreign Exchange Controls

Under current French foreign exchange control regulations there are no limitations on the amount of cash payments that we may remit to residents of foreign countries. Laws and regulations concerning foreign exchange controls do, however, require that all payments or transfers of funds made by a French resident to anon-resident such as dividend payments be handled by an accredited intermediary. All registered banks and substantially all credit institutions in France are accredited intermediaries.

Availability of Preferential Subscription Rights

In accordance with French law, our shareholders have preferential subscription rights to subscribe for new shares or other securities giving rights to acquire additional shares on a pro rata basis, as described under the section of this prospectus titled “Description of Share Capital—Key Provisions of OurBy-laws and French Law Affecting Our Ordinary Shares—Changes in Share Capital—Preferential Subscription Rights.” Holders of our securities in the U.S. (which may be in the form of shares or ADSs) may not be able to exercise preferential subscription rights for their securities unless a registration statement under the Securities Act is effective with respect to such rights or an exemption from the registration requirements imposed by the Securities Act is available. We may, from time to time, issue new shares or other securities giving rights to acquire additional shares (such as warrants) at a time when no registration statement is in effect and no Securities Act exemption is available. If so, holders of our securities in the U.S. will be unable to exercise any preferential subscription rights and their interests will be diluted. We are under no obligation to file any registration statement in connection with any issuance of new shares or other securities. We intend to evaluate at the time of any rights offering the costs and potential liabilities associated with registering the rights, as well as the indirect benefits to us of enabling the exercise by holders of shares and holders of ADSs in the U.S. of the subscription rights, and any other factors we consider appropriate at the time, and then to make a decision as to whether to register the rights. We cannot assure you that we will file a registration statement.

For holders of our ordinary shares in the form of ADSs, the depositary may make these rights or other distributions available to ADS holders. If the depositary does not make the rights available to ADS holders and determines that it is impractical to sell the rights, it may allow these rights to lapse. In that case the holders will receive no value for them. The section of this prospectus titled “Description of American Depositary Shares—Dividends and Distributions” explains in detail the depositary’s responsibility in connection with a rights offering.

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PLAN OF DISTRIBUTION

We may sell or otherwise offer our securities described herein:

• through underwriters or dealers;

• through agents;

• directly to purchasers; or

• through a combination of any of these methods of sale.

The distribution of securities may be carried out, from time to time, in one or more transactions, including:

• block transactions and transactions on the Nasdaq Global Select Market or any other organized market where the securities may be traded;

• purchases by a broker-dealer as principal and resale by the broker-dealer for its own account pursuant to a prospectus supplement;

• ordinary brokerage transactions and transactions in which a broker-dealer solicits purchasers;

• sales “at the market” to or through a market maker or into an existing trading market, on an exchange or otherwise; or

• sales in other ways not involving market makers or established trading markets, including direct sales to purchasers.

A prospectus supplement or supplements (and any related free writing prospectus that we may authorize to be provided to you) will describe the terms of the offering of the securities, including, to the extent applicable:

• the name or names of any underwriters, dealers or agents;

• the method of distribution;

• the public offering price or purchase price and the proceeds to us from that sale;

• the expenses of the offering;

• any discounts or commissions to be allowed or paid to the underwriters, dealers or agents;

• all other items constituting underwriting compensation and the discounts and commissions to be allowed or paid to dealers, if any; and

• any other information regarding the distribution of the securities that we believe to be material.

Underwriters may offer and sell the securities at a fixed price or prices, which may be changed, or from time to time at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices. We may, from time to time, authorize agents acting on a best or reasonable efforts basis as our agents to solicit or receive offers to purchase the securities upon the terms and conditions as are set forth in the applicable prospectus supplement. In connection with the sale of securities, underwriters or agents may be deemed to have received compensation from us in the form of underwriting discounts or commissions and may also receive commissions from purchasers of securities for whom they may act as agent. Underwriters may sell securities to or through dealers, and dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agent.

Underwriters, dealers and agents who participate in the distribution of securities and their controlling persons may be entitled, under agreements that may be entered into with us to indemnification by us against certain liabilities, including liabilities under the Securities Act, or to contribution with respect to payments that the underwriters, dealers or agents and their controlling persons may be required to make in respect of those liabilities.

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We may also make direct sales through subscription rights distributed to our existing shareholders on a pro rata basis, which may or may not be transferable. In any distribution of subscription rights to our shareholders, if all of the underlying securities are not subscribed for, we may then sell the unsubscribed securities directly to third parties or may engage the services of one or more underwriters, dealers or agents, including standby underwriters, to sell the unsubscribed securities to third parties.

Certain persons participating in an offering may engage in over-allotment, stabilizing transactions, short-covering transactions and penalty bids in accordance with Regulation M under the Exchange Act that stabilize, maintain or otherwise affect the price of the offered securities. If any such activities will occur, they will be described in the applicable prospectus supplement.

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ENFORCEMENT OF CIVIL LIABILITIES

We are a corporation organized under the laws of France. The majority of our directors are citizens and residents of countries other than the United States, and the majority of our assets are located outside of the United States. Accordingly, it may be difficult for investors:

• to obtain jurisdiction over us or ournon-U.S. resident officers and directors in U.S. courts in actions predicated on the civil liability provisions of the U.S. federal securities laws;

• to enforce judgments obtained in such actions against us or ournon-U.S. resident officers and directors;

• to bring an original action in a French court to enforce liabilities based upon the U.S. federal securities laws against us or ournon-U.S. resident officers or directors; and

• to enforce against us or our directors innon-U.S. courts, including French courts, judgments of U.S. courts predicated upon the civil liability provisions of the U.S. federal securities laws.

Nevertheless, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would be recognized and enforced in France provided that a French judge considers that this judgment meets the French legal requirements concerning the recognition and the enforcement of foreign judgments and is capable of being immediately enforced in the United States. A French court is therefore likely to grant the enforcement of a foreign judgment without a review of the merits of the underlying claim, only if (1) that judgment resulted from legal proceedings compatible with French standards of due process, (2) that judgment does not contravene international public order and public policy of France and (3) the jurisdiction of the United States federal or state court has been based on principles of French private international law. The French court would also require that the U.S. judgment is not tainted with fraud and is not incompatible with a judgment rendered by a French court in the same matter, or with an earlier judgment rendered by a foreign court in the same matter.

In addition, French law guarantees full compensation for the harm suffered but is limited to the actual damages, so that the victim does not suffer or benefit from the situation. Such system excludes damages such as, but not limited to, punitive and exemplary damages.

As a result, the enforcement, by U.S. investors, of any judgments obtained in U.S. courts in civil and commercial matters, including judgments under the U.S. federal securities law against us or members of our board of directors, officers or certain experts named herein who are residents of France or countries other than the United States would be subject to the above conditions.

Finally, there may be doubt as to whether a French court would impose civil liability on us, the members of our board of directors, our officers or certain experts named herein in an original action predicated solely upon the U.S. federal securities laws brought in a court of competent jurisdiction in France against us or such members, officers or experts, respectively.

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EXPENSES

The following table sets forth the expenses (other than underwriting discounts and commissions or agency fees and other items constituting underwriters’ or agents’ compensation, if any) expected to be incurred by us in connection with a possible offering of securities registered under this registration statement.

	Amount To Be Paid
SEC registration fee	$	36,360
Transfer agent’s fees			*
Printing and engraving expenses			*
Legal fees and expenses			*
Accounting fees and expenses			*
Miscellaneous			*
Total	$		*

* To be provided by a prospectus supplement or a Report on Form6-K that is incorporated by reference into this prospectus.

TAXATION

The material U.S. federal income tax consequences relating to the purchase, ownership and disposition of any of the securities offered by this prospectus will be set forth in the prospectus supplement pertaining to those securities.

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LEGAL MATTERS

Unless otherwise indicated in any prospectus supplement, Cooley LLP, Boston, Massachusetts, will be representing us in connection with any offering. Unless otherwise indicated in any prospectus supplement, McDermott Will & Emery AARPI will pass upon the validity of the ordinary shares, including ordinary shares in the form of ADSs, to be offered and other legal matters relating to French law, including matters of French income tax law, in connection with any offering. Any underwriters will be advised about other issues relating to any offering by their own legal counsel.

EXPERTS

Our consolidated financial statements as of December 31, 2016, 2017 and 2018, and for each of the three years in the period ended December 31, 2018, incorporated herein by reference from our Annual Report on Form20-F for the year ended December 31, 2018, and the effectiveness of internal control over financial reporting as of December 31, 2018, have been audited by Deloitte & Associés, an independent registered public accounting firm, as stated in their reports thereon, included therein, and are incorporated by reference herein (which reports: (1) express an unqualified opinion on the consolidated financial statements and includes an explanatory paragraph referring to going concern and (2) express an unqualified opinion on the effectiveness of internal control over financial reporting). Such consolidated financial statements have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

The offices of Deloitte & Associés are located at 6, place de la Pyramide, 92908Paris-la-Défense Cedex, Puteaux, France.

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WHERE YOU CAN FIND MORE INFORMATION

We have filed with the SEC a registration statement on FormF-3 under the Securities Act with respect to the securities described in this prospectus. This prospectus, which forms a part of the registration statement, does not contain all of the information included in the registration statement that we filed.

The SEC maintains an Internet website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers, such as us, that file electronically with the SEC.

We are subject to the information reporting requirements of the Exchange Act applicable to foreign private issuers and under those requirements we file reports with the SEC. Those reports may be inspected without charge at the locations described above. As a foreign private issuer, we are exempt from the rules under the Exchange Act related to the furnishing and content of proxy statements, and our officers, directors and principal shareholders will be exempt from the reporting and short-swing profit recovery provisions contained in Section 16 of the Exchange Act. In addition, we are not be required under the Exchange Act to file periodic reports and financial statements with the SEC as frequently or as promptly as United States companies whose securities are registered under the Exchange Act.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” into this prospectus and any accompanying prospectus supplement the information we have filed with the SEC. This means that we can disclose important information by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be a part of this prospectus, and information that we file later with the SEC will also be deemed to be incorporated by reference into this prospectus and to be a part hereof from the date of filing of such documents and will automatically update and supersede previously filed information, including information contained in this document.

We incorporate by reference into this prospectus and any accompanying prospectus supplement the following documents that we have filed with the SEC:

• our Annual Report onForm20-F for the fiscal year ended December 31, 2018, filed with the SEC on April 1, 2019;

• our Current Reports on Form6-K furnished to the SEC onJanuary 3, 2019,February 13, 2019,February  22, 2019,March 5, 2019,April  4, 2019,April 9, 2019,May  10, 2019,May 14, 2019,May  24, 2019,June 3, 2019,June  26, 2019,August 1, 2019 andAugust 7, 2019; and

• the description of our ordinary shares contained in our Registration Statement onForm8-A, filed with the SEC on October 17, 2014.

We are also incorporating by reference all subsequent annual reports on Form20-F that we file with the SEC and those of our current reports on Form6-K that we furnish to the SEC that we specifically identify in such form or in any applicable prospectus supplement as being incorporated by reference into this prospectus or such prospectus supplement after the date hereof and prior to the completion of an offering of securities under this prospectus.

We will furnish without charge to each person, including any beneficial owner, to whom a prospectus is delivered, upon written or oral request, a copy of any or all of the documents incorporated by reference in this prospectus, including exhibits to these documents. You should direct any requests for documents, either in writing to Corporate Secretary, c/o DBV Technologies S.A.,177-181 Avenue Pierre Brossolette, 92120 Montrouge, France or by telephone at +33 1 55 42 78 78.

You also may access these filings on our website atwww.dbv-technologies.com. We do not incorporate the information on our website into this prospectus or any supplement to this prospectus and you should not consider any information on, or that can be accessed through, our website as part of this prospectus or any supplement to this prospectus (other than those filings with the SEC that we specifically incorporate by reference into this prospectus or any supplement to this prospectus).

Any statement contained in a document incorporated or deemed to be incorporated by reference in this prospectus or any prospectus supplement will be deemed modified, superseded or replaced for purposes of this prospectus or any prospectus supplement to the extent that a statement contained in any other subsequently filed document that also is or is deemed to be incorporated by reference in this prospectus or any prospectus supplement modifies, supersedes or replaces such statement. Any statement that is modified or superseded will not constitute a part of this prospectus or prospectus supplement, except as modified or superseded.

Commission Position on Indemnification for Securities Act Liabilities

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers and controlling persons pursuant to the foregoing provisions, or otherwise, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.

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$125,000,000 Ordinary Shares

(including in the form of American Depositary Shares)

PROSPECTUS SUPPLEMENT

Goldman Sachs

Citigroup

                , 2020