SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC  20549

SCHEDULE 13D
(Rule 13d-101)

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 15)*

Regeneron Pharmaceuticals, Inc.
(Name of Issuer)

Common Stock, $0.001 par value
(Title of Class of Securities)

75886F 10 7
(CUSIP Number)

Karen Linehan
Executive Vice President, Legal Affairs and General Counsel
Sanofi
54, rue La Boétie, 75008
Paris, France
Telephone: +33 1 53 77 40 00

Copy to:

Michael J. Aiello, Esq.
Weil, Gotshal & Manges LLP
767 Fifth Avenue
New York, New York 10153
(212) 310-8000
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

May 25, 2020
(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box.    ☒

Note.  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See Rule 13d-7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).



13D
1
NAMES OF REPORTING PERSONS
 
 
Sanofi
 
 
 
 
2
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a)
 
(b)
 
 
3
SEC USE ONLY
 
 
 
 
 
 
 
4
SOURCE OF FUNDS (SEE INSTRUCTIONS)
 
 
SOURCE OF FUNDS  Not Applicable
 
 
 
 
5
CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)
 
 
 
 
 
 
6
CITIZENSHIP OR PLACE OF ORGANIZATION
 
 
The Republic of France
 
 
 
 
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
7
SOLE VOTING POWER
 
 
-0-
 
 
 
 
8
SHARED VOTING POWER
 
 
23,221,451 (1)
 
 
 
 
9
SOLE DISPOSITIVE POWER
 
 
-0-
 
 
 
 
10
SHARED DISPOSITIVE POWER
 
 
400,000 (1)
 
 
 
 
11
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
 
23,221,451 (1)
 
 
 
 
12
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
 
 
 
 
 
 
13
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
 
21.0% (1)(2)
 
 
 
 
14
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
 
CO
 
 
 
 

(1)          As of May 29, 2020, Sanofi directly held 0 shares of Common Stock and Aventisub LLC (the successor by merger to Aventis Pharmaceuticals Inc. (“Aventis”) and an indirect, wholly-owned subsidiary of Sanofi (“Aventisub”)), directly held 400,000 shares of Common Stock, which reflects the sales of shares described in Item 4 of this Amendment No. 15.  However, as of April 14, 2020, the record date for the annual meeting of stockholders of Regeneron Pharmaceuticals, Inc. (the “Company”) to be held on June, 12, 2020 (the “2020 Annual Meeting”), Sanofi directly held 20,421,899 shares of Common Stock and Aventisub directly held 2,799,552 shares of Common Stock.  Consequently, Sanofi may be deemed the beneficial owner of such shares until the conclusion of the 2020 Annual Meeting because of Sanofi’s continued voting power up until that time.  Pursuant to the Amended and Restated Investor Agreement, dated as of January 11, 2014, by and among Sanofi, sanofi-aventis US LLC, Aventis, sanofi-aventis Amérique du Nord (collectively, the “Sanofi Parties”) and the Company, as amended, the Sanofi Parties agreed to vote their respective shares of the Company, subject to specified exceptions, in accordance with the recommendation of the Company’s Board of Directors.  See Item 5 of the Schedule 13D.

(2)          Calculation based on 110,673,311 shares of Common Stock outstanding as of April 14, 2020, as reported in the Company’s Quarterly Report on Form 10-Q (the “First Quarter 10-Q”) filed with the Securities and Exchange Commission (“SEC”) on May 5, 2020.  Without giving effect to Sanofi’s continued voting power up until the conclusion of the 2020 Annual Meeting, Sanofi would beneficially own less than 1% of the shares of Common Stock outstanding as of May 29, 2020 (based on (i) 110,673,311 shares of Common Stock, as reported in the First Quarter 10-Q, minus (ii) 9,806,805 shares of Common Stock, which reflects the Issuer’s Repurchase (as described in Item 4 of this Amendment No. 15)).

2

This Amendment No. 15 (“Amendment No. 15”) amends the Statement on Schedule 13D first filed with the Securities and Exchange Commission (the “SEC”) on January 14, 2014, as amended (the “Schedule 13D”), and is filed by Sanofi (“Sanofi” or the “Reporting Person”) with respect to the common stock, $0.001 par value per share (the “Common Stock”), of Regeneron Pharmaceuticals, Inc. (the “Issuer” or the “Company”).  Capitalized terms used herein but not otherwise defined herein have the meanings given to them in the Schedule 13D.
 
Item 2.
Identity and Background.

Item 2 of the Schedule 13D is supplemented as follows:

Schedule I of the Schedule 13D is replaced with Schedule I to this Amendment No. 15.  During the last five years, to the best of the Reporting Person’s knowledge, none of the Scheduled Persons has been (1) convicted in a criminal proceeding (excluding traffic violations and other similar misdemeanors) or (2) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 4.
Purpose of Transaction.

Item 4 of the Schedule 13D is supplemented as follows:
 
On May 29, 2020, Sanofi and Aventisub LLC, an indirect, wholly-owned subsidiary of Sanofi (“Aventisub”), consummated the sale of an aggregate of 13,014,646 shares of Common Stock at $509.85 per share (13,014,646 shares in a registered public offering to the underwriters (the “Offering”) and 9,806,805 shares in a private sale to the Company (the “Repurchase”)).  Specifically, Sanofi sold 10,615,094 shares in the Offering and 9,806,805 shares to the Company, and Aventisub sold 2,399,552 shares in the Offering.
 
On May 29, 2020, upon the consummation of the Offering and the Repurchase, an amendment, dated May 25, 2020 (the “Amendment Letter Agreement”), to the Amended and Restated Investor Agreement, dated as of January 11, 2014, as amended (the “Investor Agreement”), became effective.  The Amendment Letter Agreement, which is among Sanofi, sanofi-aventis US LLC, Aventisub (collectively, the “Sanofi Entities”), and the Company provides, among other things, that:  (1) the “standstill” provisions in the Investor Agreement, which contractually prohibit Sanofi from seeking to directly or indirectly exert control of the Company, will continue to apply pursuant to their terms; (2) Sanofi will no longer have the right to designate an independent board member for the Company’s board of directors (though, the termination of Sanofi’s board designation right will not impact the term of the current Sanofi designee, N. Anthony Coles, M.D.); (3) the voting commitments contained in the Investor Agreement will continue to apply to shares of Common Stock held by Sanofi and its affiliates for so long as such shares are held by them; (4) Sanofi and its affiliates will no longer have registration rights with respect to shares of Common Stock held by them as provided in the Investor Agreement; (5) the information rights and pre-emptive rights provided to Sanofi and its affiliates under the Investor Agreement will no longer apply; and (6) the restrictions on transfer in the Investor Agreement will continue to apply to the shares of Common Stock held by Sanofi and its affiliates until December 20, 2020 (except those shares may be used to satisfy certain funding obligations of Sanofi under the companies' existing collaborations).
 
In connection with the Offering, Sanofi and Aventisub entered into a customary 90-day “lock-up” agreement with the underwriters, dated May 25, 2020 (the “Lock-up Agreement”).
 
The information set forth under Item 6 of this Amendment No. 15 is incorporated herein by reference.
 
The descriptions of the Amendment Letter Agreement and Lock-up Agreement as described in this Item 4 do not purport to be complete and are qualified in their entirety by reference to the Amendment Letter Agreement and Lock-up Agreement, which included in this Statement as Exhibit 99.5 and Exhibit 99.6, respectively, and are incorporated herein by reference.
 
3

Item 5.
Interests in the Securities of the Issuer.

Item 5 of the Schedule 13D is supplemented as follows:
 
(a) and (b)  The responses of the Reporting Person to Rows (7) through (13) of the cover page of this Amendment No. 15 as of May 29, 2020, are incorporated herein by reference.  The Reporting Person may be deemed to have shared voting and dispositive power with respect to the shares of Common Stock directly owned by Aventisub, its subsidiary.
 
As described in footnote (1) to the cover page of this Amendment 15, the shares of Common Stock beneficially owned by the Reporting Person as set forth on the cover page of this Amendment No. 15 continues to include a total of 22,821,451 shares of Common Stock sold by Sanofi and Aventisub in the Offering and the Repurchase described above in Item 4 because Sanofi and Aventisub were the owners of such shares on the record date for the 2020 Annual Meeting and therefore the Reporting Person may be deemed the beneficial owner of such shares until the conclusion of the 2020 Annual Meeting because of its continued voting power up until that time.
 
Pursuant to the Investor Agreement, the Sanofi Parties have agreed to vote their respective shares of Common Stock, subject to specified exceptions, in accordance with the recommendation of the Company’s Board of Directors.
 
To the Reporting Person’s knowledge, none of the directors or executive officers of the Reporting Person listed on Schedule I to the Schedule 13D beneficially owns any shares of Common Stock as May 29, 2020.
 
(c)  During the last sixty days through and including May 29, 2020, no transactions were effected in the Common Stock by the Reporting Person except as disclosed in Item 4 of this Amendment No. 15.
 
To the Reporting Person’s knowledge, none of the directors or executive officers of the Reporting Person listed on Schedule I to the Schedule 13D effected transactions in the Common Stock during the period described above.
 
(d)  Not applicable.
 
(e)  For the reason described above in this Item 5, at the conclusion of the 2020 Annual Meeting to be held on June 12, 2020, the Reporting Person will cease to be the beneficial owner of more than five percent of the Common Stock.
 
Item 6.
Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 of Schedule 13D is supplemented as follows:

The information set forth under Item 4 of this Amendment No. 15 is incorporated herein by reference.

On May 25, 2020, the Company provided a limited waiver of lock-up obligations in the Investor Agreement to allow the Sanofi Entities to consummate the Offering and the Repurchase.

On May 26, 2020, in connection with Offering, Sanofi, Aventisub and the Issuer entered into an Underwriting Agreement (the “Underwriting Agreement”) with certain underwriters, including BofA Securities, Inc. and Goldman Sachs & Co. LLC (collectively, the “Underwriters”). Pursuant to the Underwriting Agreement, Sanofi agreed to sell 10,615,094 shares of Common Stock and Aventisub agreed to sell 1,216,402 shares of the Common Stock to the Underwriters at a price of $509.85 per share.  In addition, Sanofi and Aventisub granted the Underwriters an option to purchase up to an additional 1,183,150 shares of Common Stock in the aggregate, which option was fully exercised by the Underwriters.

4

On May 25, 2020, Sanofi and the Issuer entered into a Stock Repurchase Agreement (the “Stock Repurchase Agreement”), pursuant to which, and conditioned upon the closing of the Offering, the Company agreed to repurchase from Sanofi and Sanofi agreed to sell to the Company, a number of shares of Common Stock equal to $5 billion divided by the price at which the shares of Common Stock are sold to the public in the Offering, less the underwriting discount.

The descriptions of the Underwriting Agreement and Stock Repurchase Agreement as set forth in this Item 6 do not purport to be complete and are qualified in their entirety by reference to the Underwriting Agreement and Stock Repurchase Agreement, which are included in this Statement as Exhibit 99.7, and Exhibit 99.8, respectively, and are incorporated herein by reference.

Item 7.
Material to be Filed as Exhibits.

Exhibit No.
 
Description
     
 
Amendment Letter Agreement, dated as of May 25, 2020, by and among the Sanofi Entities and the Issuer.*
     
 
Lock-up Agreement, dated as of May 25, 2020, by and among Sanofi, Aventisub and the Underwriters.*
     
 
Underwriting Agreement, dated as of May 26, 2020, by and among Sanofi, Aventisub, the Underwriters and the Issuer.*
     
 
Stock Repurchase Agreement, dated as of May 25, 2020, by and between Sanofi and the Issuer.*


*Filed herewith.

5

SIGNATURE

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  May 29, 2020
   
     
 
SANOFI
 
     
 
By:
/s/ Alexandra Roger  
   
Name:
Alexandra Roger
 
   
Title:
Attorney-in-fact
 

6

SCHEDULE I
 
Name, business address, present principal occupation or employment and place of citizenship of the directors and executive officers of
 
SANOFI
 
The name, business address and present principal occupation or employment of each of the directors and executive officers of Sanofi are set forth below.  Unless otherwise indicated, the business address of each director and executive officer is Sanofi, 54 rue La Boétie, 75008 Paris, France.  Unless otherwise indicated, each director and executive officer is a citizen of France.

DIRECTORS
 
Name
Present Principal Occupation or Employment and Name and Principal Address of Corporation in which Employment is Conducted at Sanofi
   
Serge Weinberg
Chairman of the Board of Directors of Sanofi, Chairman of Weinberg Capital Partners
   
Paul Hudson
British citizenship
Chief Executive Officer of Sanofi
   
Laurent Attal
Director at Sanofi, Executive Vice President–Research and Innovation at L’Oréal
   
Christopher Babule
Director at Sanofi, Executive Vice President, Chief Financial Officer at L’Oréal
   
Bernard Charlès
Independent Director at Sanofi, Vice Chairman of the Board of Directors and CEO of Dassault Systèmes SE
   
Rachel Duan
Chinese citizenship
Independent Director at Sanofi, Senior Vice President of General Electric and President and Chief Executive Officer of General Electric Global Markets
   
Lise Kingo
Danish citizenship
Independent Director at Sanofi, Chief Executive Officer and Executive Director of United Nations Global Compact
   
Patrick Kron
Independent Director at Sanofi, Chairman of Imerys and Chairman of Truffle Capital
   
Fabienne Lecorvaisier
Independent Director at Sanofi, Executive Vice President, Chief Financial Officer and Executive Committee Member of Air Liquide
   
Melanie Lee
British citizenship
Independent Director at Sanofi, Chief Executive Officer of LifeArc
   
Carole Piwnica
Belgian citizenship
Independent Director at Sanofi, Managing Partner of Naxos S.A.
   
Gilles Schnepp
Independent Director at Sanofi, Vice-Chairman of the Supervisory Board of Peugeot S.A.

7

Name
Present Principal Occupation or Employment and Name and Principal Address of Corporation in which Employment is Conducted at Sanofi
   
Diane Souza
U.S. citizenship
Independent Director at Sanofi, Member of the Board of Directors of Amica Insurance Companies
   
Thomas C. Südhof
German and U.S. citizenship
Independent Director at Sanofi, Avram Goldstein Professor at the Department of Molecular & Cellular Physiology, Neurosurgery, Psychiatry and Neurology, Stanford University, School of Medicine (United States)
   
Marion Palme
German citizenship
Director representing employees at Sanofi, Laboratory Technician
   
Christian Senectaire
Director representing employees at Sanofi, Senior Production Technician

8

EXECUTIVE OFFICERS

Name
Present Principal Occupation or Employment and Name and Principal Address of Corporation in which Employment is Conducted at Sanofi
   
Paul Hudson
British citizenship
Chief Executive Officer of Sanofi
   
Olivier Charmeil
Executive Vice President, General Medicines
   
Jean-Baptiste Chasseloup de Chatillon
Executive Vice President, Chief Financial Officer
   
Karen Linehan
U.S. and Irish citizenship
Executive Vice President, Legal Affairs and General Counsel
   
David Loew
Swiss citizenship
Executive Vice President, Sanofi Pasteur
   
Philippe Luscan
Executive Vice President, Global Industrial Affairs
   
Alan Main
English citizenship
Executive Vice President, Consumer Healthcare
   
Caroline Luscombe
English citizenship
Executive Vice President, Human Resources
   
Bill Sibold
U.S. and Canadian citizenship
 
Business address:
50 Binney Street
Cambridge, MA 02142
Executive Vice President, Sanofi Genzyme
   
John Reed
U.S. citizenship
 
Business address:
640 Memorial Drive
Cambridge, MA 02139
Executive Vice President, Global Head of Research and Development


9

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