UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 19, 2015

Welltower Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (419) 247-2800

Health Care REIT, Inc.

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On October 19, 2015, Welltower Inc. (the “Company”) sold $500,000,000 aggregate principal amount of the Company’s 4.000% notes due 2025 (the “Notes”) pursuant to an automatic shelf registration statement of the Company on Form S-3 (File No. 333-203802) filed with the Securities and Exchange Commission on May 1, 2015.

The Notes are a further issuance of, are fungible with and are consolidated and form a single series with the Company’s 4.000% notes due 2025, issued on May 26, 2015 in the amount of $750,000,000. The aggregate principal amount of outstanding notes of this series as a result of the sale of the Notes is $1,250,000,000.

The Notes were issued under an Indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), dated as of March 15, 2010 (the “Indenture”), as supplemented by Supplemental Indenture No. 11 between the Company and the Trustee, dated as of May 26, 2015 (the “Supplemental Indenture”), as amended by Amendment No. 1 to Supplemental Indenture No. 11 between the Company and the Trustee, dated October 19, 2015 (the “Amendment”). The Notes bear interest at a rate of 4.000% per year, payable semi-annually in arrears on June 1 and December 1 of each year, commencing December 1, 2015. The Notes mature on June 1, 2025.

The foregoing description of the Indenture, the Supplemental Indenture, the Amendment and the Notes is qualified in its entirety by reference to the Indenture, the Supplemental Indenture, the Amendment and the form of global note, attached hereto as Exhibits 4.1, 4.2, 4.3 and 4.4, respectively, and incorporated by reference herein.

(d) Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: October 20, 2015

Exhibit Index