SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G (RULE 13D-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13D-1(B), (C) AND (D) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2(B) (AMENDMENT NO. ____________)* REGENERON PHARMACEUTICALS, INC. -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, par value $0.001 per share -------------------------------------------------------------------------------- (Title of Class of Securities) 75886F 10 7 -------------------------------------------------------------------------------- (CUSIP Number) March 23, 2001 -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [_] Rule 13d-1(b) [X] Rule 13d-1(c) [_] Rule 13d-1(d) *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 the disclosures provided in a prior cover page. The information required in 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). Page 1 of 16 Exhibit Index on Page 11 CUSIP NO. 75886F 10 7 13G PAGE 2 --------- of ------- 16 PAGES --- 1 Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons (Entities Only) Feldon Invest SA -------------------------------------------------------------------------------- 2 Check the Appropriate Box if a Member of a Group (a) [ ] (See Instructions) (b) [ ] -------------------------------------------------------------------------------- 3 SEC Use Only -------------------------------------------------------------------------------- 4 Citizenship or Place of Organization Panama -------------------------------------------------------------------------------- Number of 5 Sole Voting Power N/A ------------------------------------------------------------------ Shares 6 Shared Voting Power 4,000,000 ------------------------------------------------------------------ Beneficially 7 Sole Dispositive Power N/A ------------------------------------------------------------------ Owned by 8 Shared Dispositive Power Each Reporting 4,000,000 Person With -------------------------------------------------------------------------------- 9 Aggregate Amount Beneficially Owned by Each Reporting Person 4,000,000 -------------------------------------------------------------------------------- 10 Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] (See Instructions) -------------------------------------------------------------------------------- 11 Percent of Class Represented by Amount in Row (9) 9.8% -------------------------------------------------------------------------------- 12 Type of Reporting Person (See Instructions) CO -------------------------------------------------------------------------------- CUSIP NO. 75886F 10 7 13G PAGE 3 --------- of ------- 16 PAGES --- 1 Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons (Entities Only) Emfeld Ltd -------------------------------------------------------------------------------- 2 Check the Appropriate Box if a Member of a Group (a) [ ] (See Instructions) (b) [ ] -------------------------------------------------------------------------------- 3 SEC Use Only -------------------------------------------------------------------------------- 4 Citizenship or Place of Organization Cayman Islands -------------------------------------------------------------------------------- Number of 5 Sole Voting Power N/A ------------------------------------------------------------------ Shares 6 Shared Voting Power 4,000,000 ------------------------------------------------------------------ Beneficially 7 Sole Dispositive Power N/A ------------------------------------------------------------------ Owned by 8 Shared Dispositive Power Each Reporting 4,000,000 Person With -------------------------------------------------------------------------------- 9 Aggregate Amount Beneficially Owned by Each Reporting Person 4,000,000 -------------------------------------------------------------------------------- 10 Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] (See Instructions) -------------------------------------------------------------------------------- 11 Percent of Class Represented by Amount in Row (9) 9.8% -------------------------------------------------------------------------------- 12 Type of Reporting Person (See Instructions) CO -------------------------------------------------------------------------------- CUSIP NO. 75886F 10 7 13G PAGE 4 --------- of ------- 16 PAGES --- 1 Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons (Entities Only) Bertarelli & Cie -------------------------------------------------------------------------------- 2 Check the Appropriate Box if a Member of a Group (a) [ ] (See Instructions) (b) [ ] -------------------------------------------------------------------------------- 3 SEC Use Only -------------------------------------------------------------------------------- 4 Citizenship or Place of Organization Switzerland -------------------------------------------------------------------------------- Number of 5 Sole Voting Power N/A ------------------------------------------------------------------ Shares 6 Shared Voting Power 4,000,000 ------------------------------------------------------------------ Beneficially 7 Sole Dispositive Power N/A ------------------------------------------------------------------ Owned by 8 Shared Dispositive Power Each Reporting 4,000,000 Person With -------------------------------------------------------------------------------- 9 Aggregate Amount Beneficially Owned by Each Reporting Person 4,000,000 -------------------------------------------------------------------------------- 10 Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] (See Instructions) -------------------------------------------------------------------------------- 11 Percent of Class Represented by Amount in Row (9) 9.8% -------------------------------------------------------------------------------- 12 Type of Reporting Person (See Instructions) OO -------------------------------------------------------------------------------- CUSIP NO. 75886F 10 7 13G PAGE 5 --------- of ------- 16 PAGES --- 1 Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons (Entities Only) Ernesto Bertarelli -------------------------------------------------------------------------------- 2 Check the Appropriate Box if a Member of a Group (a) [ ] (See Instructions) (b) [ ] -------------------------------------------------------------------------------- 3 SEC Use Only -------------------------------------------------------------------------------- 4 Citizenship or Place of Organization Switzerland -------------------------------------------------------------------------------- Number of 5 Sole Voting Power N/A ------------------------------------------------------------------ Shares 6 Shared Voting Power 4,000,000 ------------------------------------------------------------------ Beneficially 7 Sole Dispositive Power N/A ------------------------------------------------------------------ Owned by 8 Shared Dispositive Power Each Reporting 4,000,000 Person With -------------------------------------------------------------------------------- 9 Aggregate Amount Beneficially Owned by Each Reporting Person 4,000,000 -------------------------------------------------------------------------------- 10 Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] (See Instructions) -------------------------------------------------------------------------------- 11 Percent of Class Represented by Amount in Row (9) 9.8% -------------------------------------------------------------------------------- 12 Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- CUSIP NO. 75886F 10 7 13G PAGE 6 --------- of ------- 16 PAGES --- ITEM 1(A). NAME OF ISSUER: Regeneron Pharmaceuticals, Inc. ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 777 Old Saw Mill River Road Tarrytown, New York 10591-6707 ITEM 2(A). NAMES OF PERSONS FILING: This statement is being filed jointly by: (i) Feldon Invest SA, a Panamanian stock company, the holder of an aggregate of 4,000,000 shares of the issuer's common stock, par value $0.001; (ii) Emfeld Ltd, a Cayman Islands stock company, which is the holder of all of the issued and outstanding capital stock of Feldon Invest SA; (iii)Bertarelli & Cie, a societe en commandite par actions organized under the laws of Switzerland, which is the holder of all of the issued and outstanding capital stock of Emfeld Ltd; and (iv) Ernesto Bertarelli, an individual, who, as President, Managing Director and controlling shareholder of Bertarelli & Cie, controls that entity. ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: For Feldon Invest SA: Urbanizacion Obarrio Swiss Bank Building 53rd Street Panama City, Panama For Emfeld Ltd: One Capital Place Second Floor P.O. Box 1787 George Town, Grand Cayman, Cayman Islands For Ernesto Bertarelli and Bertarelli & Cie: c/o Abacus Conseil et Expertise Comptable SA 2, Chemin des Mines CH-1202 Geneva Switzerland ITEM 2(C). CITIZENSHIP: Feldon Invest SA: A stock company organized under the laws of Panama Emfeld Ltd: A stock company organized under the laws of the Cayman Islands Bertarelli & Cie: A societe en commandite par actions organized under the laws of Switzerland CUSIP NO. 75886F 10 7 13G PAGE 7 --------- of ------- 16 PAGES --- Ernesto Bertarelli: Switzerland ITEM 2(D). TITLE OF CLASS OF SECURITIES: Common Stock, par value $0.001 per share ITEM 2(E). CUSIP NUMBER: 75886F 10 7 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B), OR 13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A: Not applicable. ITEM 4. OWNERSHIP. The ownership percentage set forth below is based on 40,787,624 shares of common stock outstanding, as reported in the issuer's prospectus dated March 19, 2001. With respect to Feldon Invest SA: (a) Amount beneficially owned: 4,000,000 (b) Percent of class: 9.8% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: N/A (ii) Shared power to vote or to direct the vote: 4,000,000 (iii)Sole power to dispose or to direct the disposition of: N/A (iv) Shared power to dispose or to direct the disposition of: 4,000,000 With respect to Emfeld Ltd: (a) Amount beneficially owned: 4,000,000 (b) Percent of class: 9.8% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: N/A (ii) Shared power to vote or to direct the vote: 4,000,000 (iii)Sole power to dispose or to direct the disposition of: N/A (iv) Shared power to dispose or to direct the disposition of: 4,000,000 CUSIP NO. 75886F 10 7 13G PAGE 8 --------- of ------- 16 PAGES --- With respect to Bertarelli & Cie: (a) Amount beneficially owned: 4,000,000 (b) Percent of class: 9.8% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: N/A (ii) Shared power to vote or to direct the vote: 4,000,000 (iii)Sole power to dispose or to direct the disposition of: N/A (iv) Shared power to dispose or to direct the disposition of: 4,000,000 With respect to Ernesto Bertarelli: (a) Amount beneficially owned: 4,000,000 (b) Percent of class: 9.8% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: N/A (ii) Shared power to vote or to direct the vote: 4,000,000 (iii)Sole power to dispose or to direct the disposition of: N/A (iv) Shared power to dispose or to direct the disposition of: 4,000,000 CUSIP NO. 75886F 10 7 13G PAGE 9 --------- of ------- 16 PAGES --- ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. Not applicable. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not applicable. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON. Not applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. Not applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. Not applicable. ITEM 10. CERTIFICATIONS. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. CUSIP NO. 75886F 10 7 13G PAGE 10 -------- of ------- 16 PAGES --- SIGNATURE After reasonable inquiry and to the best of our knowledge and belief, we certify that the information set forth in this statement is true, complete and correct. Dated: March 30, 2001 FELDON INVEST SA /s/ Thomas J. Plotz ---------------------- By: Thomas J. Plotz Title: Attorney-in-Fact EMFELD LTD /s/ Thomas J. Plotz ------------------------ By: Thomas J. Plotz Title: Attorney-in-Fact BERTARELLI & CIE /s/ Thomas J. Plotz ------------------------- By: Thomas J. Plotz Title: Attorney-in-Fact /s/ Ernesto Bertarelli* ------------------------- Ernesto Bertarelli * By: /s/ Thomas J. Plotz --------------------------------- Thomas J. Plotz, Attorney-in-Fact CUSIP NO. 75886F 10 7 13G PAGE 11 -------- of ------- 16 PAGES --- EXHIBITS 1. Power of Attorney of Feldon Invest SA Page 12 2. Power of Attorney of Emfeld Ltd Page 13 3. Power of Attorney of Bertarelli & Cie Page 14 4. Power of Attorney of Ernesto Bertarelli Page 15 5. Joint Filing Agreement Pursuant to Rule 13d-1(k)(1) Page 16