EOCA Endesa Americas S.A. American Depositary Share (Each Representing 30 Shares of )

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Amendment No. 4

to

SCHEDULE TO

(Rule 14d-100)

Tender Offer Statement under Section 14(d)(1) or 13(e)(3)

of the Securities Exchange Act of 1934

ENDESA AMÉRICAS S.A.

(Name of Subject Company (Issuer))

ENERSIS AMÉRICAS S.A.

ENEL S.p.A.

ENEL IBEROAMÉRICA, S.R.L.

ENEL LATINOAMÉRICA, S.A.

(Name of Filing Persons (Offeror))

American Depositary Shares (ADS) each representing

30 shares of Common Stock, no par value

(Title of Class of Securities)

29261D 104

(CUSIP Number of Class of Securities)

Common Stock, no par value

(Title of Class of Securities)

N/A

(CUSIP Number of Class of Securities)

Javier Galán

Enersis Américas S.A.

Santa Rosa 76

Santiago, Chile

+(562) 2353-4510

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications on Behalf of Filing Persons)

With copies to:

J. Allen Miller, Esq.

Sey-Hyo Lee, Esq.

Chadbourne & Parke LLP

1301 Avenue of the Americas

New York, New York 10019

(212) 408-5100

CALCULATION OF FILING FEE

Check the appropriate boxes below to designate any transactions to which the statement relates:

Check the following box if the filing is a final amendment reporting the results of the tender offer:   ¨

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

INTRODUCTION

This Amendment No. 4 to the combined Schedule TO and Schedule 13E-3 under cover of Schedule TO (this “Schedule TO”) amends and supplements the Schedule TO relating to the offer (the “U.S. Offer”) by Enersis Américas S.A. (“Enersis Américas”), a Chilean publicly held limited liability stock corporation, to purchase:

for Ch$300 per Share, and Ch$9,000 per ADS, in each case, in cash, without interest, payable in U.S. dollars, and less the amount of any fees, expenses and withholding taxes that may be applicable, upon the terms set forth in the Offer to Purchase, dated as of September 14, 2016, and any amendments or supplements thereto (the “Offer to Purchase”), and in the related Form of Acceptance Letter and ADS Letter of Transmittal, copies of which are attached hereto as Exhibits (a)(1)(A), (a)(1)(B) and (a)(1)(C), respectively.

Simultaneously with the U.S. Offer, Enersis Américas is making an offer in accordance with the tender offer rules of the Republic of Chile to purchase all of the outstanding Shares from all holders of Shares, wherever located, (the “Chilean Offer,” and together with the U.S. Offer, the “Offers”) for the same price and on substantially the same terms as the Shares to be purchased pursuant to the U.S. Offer.

This Schedule TO is filed on behalf of Enersis Américas, Enel S.p.A., an Italian publicly held stock corporation, and its subsidiaries, Enel Iberoamérica, S.R.L., a Spanish limited liability corporation, and Enel Latinoamérica, S.A., a Spanish corporation, which are affiliates of Endesa Américas, the subject company. The information set forth in the Offer to Purchase, including all exhibits thereto, is expressly incorporated herein by reference in response to all of the items of this Schedule TO, including, without limitation, all of the information required by Schedule 13E-3, except as otherwise set forth below.

This Amendment No. 4 is being filed to provide certain additional information. Except as specifically provided herein, the information contained in the Schedule TO, the Offer to Purchase, as amended, and the related Form of Acceptance Letter and ADS Letter of Transmittal remains unchanged.

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Item 11(c) is hereby amended and supplemented by adding the following:

The information set forth in the Form 6-K of Enersis Américas attached hereto as Exhibit (a)(5)(A) is incorporated herein by reference.

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SIGNATURES

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

Date: October 21, 2016

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