UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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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): May 5, 2015 (May 4, 2015)

American Realty Capital Healthcare Trust III, Inc.

(Exact Name of Registrant as Specified in its Charter)

Maryland

(State or Other Jurisdiction of Incorporation)

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:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.01. Completion of Acquisition or Disposition of Assets.

On May 4, 2015, American Realty Capital Healthcare Trust III, Inc. (the “Company”), through a wholly-owned subsidiary of its operating partnership, acquired the fee simple interest in a medical office building located in Hudson, Florida (“DaVita Hudson”) for a contract purchase price of $2.7 million, exclusive of closing costs. The seller of DaVita Hudson was M.K. Acharya, M.D. The seller has no material relationship with the Company or any of its affiliates, or any director or officer of the Company or any associate of any such director or officer.

The Company funded the acquisition of DaVita Hudson with proceeds from its ongoing initial public offering of common stock. At closing, the Company paid an acquisition fee of approximately $41,000 to the Company’s advisor, American Realty Capital Healthcare III Advisors, LLC.

DaVita Hudson contains 8,984 rentable square feet and was 100% leased to two tenants as of the date of acquisition. The leases are net whereby the tenants are required to pay their proportionate share of operating expenses, including all costs to maintain and repair the roof and structure of the building, in addition to base rent.  The following table provides information related to lease commencement and termination dates, rentable square feet, annualized cash rental income, rental escalations and renewal options for DaVita Hudson:

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SIGNATURES

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.