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): September 4, 2015 (September 2, 2015)

KEY ENERGY SERVICES, INC.

(Exact Name of Registrant as Specified in Charter)

1301 McKinney Street, Suite 1800

Houston, Texas 77010

(Address of Principal Executive Offices and Zip Code)

713-651-4300

(Registrant’s telephone number, including area code)

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):

Item 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On September 2, 2015, Key Energy Services, Inc. (the “Company”) was notified by the New York Stock Exchange (the “NYSE”) that it was not in compliance with the continued listing standards set forth in Section 802.01C of the NYSE Listed Company Manual because the average closing price of the Company’s common stock was less than $1.00 over a consecutive 30 trading-day period.

The Company anticipates it will notify the NYSE by September 17, 2015 that it intends to cure the deficiency and to return to compliance with the NYSE continued listing requirement. The Company can avoid delisting if, during the six-month period following receipt of the NYSE notice, on the last trading-day of any calendar month, the Company’s common stock has a closing share price of at least $1.00 and an average closing share price of at least $1.00 over the 30 trading-day period ending on the last trading day of that month. The Company intends to consider available alternatives, potentially including a reverse stock split, in order to cure the stock price deficiency and return to compliance with the NYSE continued listing requirement. As a Maryland corporation, a reverse stock split would only require approval of the Company’s Board of Directors.

If the Company’s common stock ultimately were to be delisted for any reason, including failure to regain compliance with Section 802.01C of the NYSE Listed Company Manual, it could negatively impact the Company by (i) reducing the liquidity and market price of the Company’s common stock; (ii) reducing the number of investors willing to hold or acquire the Company’s common stock, which could further harm the performance of the Company’s common stock and negatively impact the Company’s ability to raise equity financing; (iii) limiting the Company’s ability to use a registration statement to offer and sell freely tradable securities, thereby preventing the Company from accessing the public capital markets; and (iv) impairing the Company’s ability to provide equity incentives to its employees.

Under the NYSE rules, the Company’s common stock will continue to be traded on the NYSE during this period, subject to the Company’s compliance with other continued listing requirements. The NYSE notification does not affect Key’s business operations or its Securities and Exchange Commission (“SEC”) reporting requirements and does not conflict with or cause an event of default under any of the Company’s material debt or other agreements.

Item 7.01 Regulation FD Disclosure

As required by Section 802.01C of the NYSE Listed Company Manual, the Company issued a press release on September 4, 2015, announcing that it had received the notice of noncompliance with the NYSE’s continued listing standard. A copy of the press release is furnished herewith as Exhibit 99.1.

The information furnished pursuant to this Item 7.01 and Exhibit 99.1 shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed under the Securities Act of 1933, as amended, unless specifically identified therein as being incorporated therein by reference.

Item 9.01. Financial Statements and 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.

Exhibit Index