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): February 1, 2018 (January 31, 2018)

ALLERGAN PLC

(Exact Name of Registrant as Specified in Charter)

Clonshaugh Business and Technology Park

Coolock, Dublin, D17 E400, Ireland

(Address of Principal Executive Offices)

(862) 261-7000

(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):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

The information relating to a pre-tax charge in the quarter ended December 31, 2017, as described in Item 8.01 below, is incorporated herein by reference.

On January 31, 2018, Allergan plc (the “Company”) and Teva Pharmaceuticals Industries Ltd. (“Teva”) entered into a Settlement Agreement and Mutual Releases (the “Agreement”). The Agreement provides that the Company will make a one-time payment of $700 million to Teva, the Company and Teva will jointly dismiss their working capital dispute arbitration (which is described in greater detail in the Company’s Form 10-Q filed on November 2, 2017), and the Company and Teva will release actual or potential claims under the Master Purchase Agreement, dated July 26, 2015, by and between the Company and Teva, for breach of any representation, warranty or covenant (other than any breach of a post-closing covenant not known as of the date of the Agreement). The Company will take a one-time pre-tax charge to Discontinued Operations of approximately $465 million in the quarter ended December 31, 2017 associated with the Agreement.

SIGNATURES

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