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): December 1, 2013

MEDICAL PROPERTIES TRUST, INC.

MPT OPERATING PARTNERSHIP, L.P.

(Exact Name of Registrant as Specified in Charter)

Commission File Number 001-32559

(205) 969-3755

(Registrant’s telephone number, including area code)

(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:

On December 1, 2013, Medical Properties Trust, Inc. (the “Company”) completed its previously announced acquisition of 11 rehabilitation facilities in the Federal Republic of Germany from RHM Klinik-und Altenheimbetriebe GmbH & Co. KG (“RHM”) for an aggregate purchase price, including approximately €9.0 million in applicable transfer taxes, of approximately €184.0 million (plus a commitment to provide up to €10.0 million in financing for the construction of additions to the facilities within the next two years). Each of the facilities has been leased back to RHM under a master lease providing for a term of 27 years and for annual rent increases of 2.0 % from 2015 through 2017, and of 0.5 % thereafter. On December 31, 2020 and every three years thereafter rent will also be increased to reflect 70% of cumulative increases in the German consumer price index.

The table below sets forth pertinent details with respect to the eleven facilities acquired:

There were no material relationships prior to this transaction among the Company and its affiliates and RHM and its affiliates. The Company funded the purchase price through the sale of €200 million aggregate principal amount of 5.750% senior notes due 2020 at an issue price of 100%, completed on October 10, 2013, for net proceeds of approximately €196.5 million before expenses.

On December 3, 2013, the Company issued a press release announcing the completion of the RHM acquisition, a copy of which is furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

The information furnished pursuant to this Item 7.01 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended.

In addition, this information shall not be deemed incorporated by reference in any filing of the Company with the Securities and Exchange Commission, except as expressly set forth by specific references in any such filing.

(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.

Date: December 5, 2013

INDEX TO EXHIBITS