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): June 29, 2016

ARRIS INTERNATIONAL PLC

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (678) 473-2000

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 June 29, 2016, ARRIS International plc (“ARRIS” or the “Company”) entered into a Warrant and Registration Rights Agreement (the “Warrant”) with Comcast Cable Communications Management, LLC (“Comcast”) pursuant to which Comcast may purchase up to 8.0 million of ARRIS’ ordinary shares, nominal value £0.01 per share (subject to adjustment in accordance with the terms of the Warrant, the “Shares”).

The Warrant will vest in two tranches based on the amount of products and services Comcast purchases from the Company. Between 1.0 million and 3.0 million Shares are issuable under the Warrant based on Comcast’s purchases in 2016 and between 1.0 million and 5.0 million are issuable based on purchases made in 2017. In order for the Warrant to vest above the 1.0 million Share threshold in both 2016 and 2017, specified increased purchases are required and a set percentage of the purchases must be for products and services included in ARRIS’ Network & Cloud segment for 2016 and 2017, respectively. The exercise price per Share is $22.19, which represents the average volume-weighted price of ARRIS’ ordinary shares on NASDAQ for the 10-day trading period preceding the date of the Warrant.

The Warrant provides for net Share settlement that, if elected by Comcast, will reduce the number of Shares issued upon exercise to reflect net settlement of the exercise price. Comcast may also request cash settlement of the Warrant upon exercise in lieu of issuing Shares, however, such cash election is at the discretion of ARRIS. The warrants will expire on June 30, 2023.

The Warrant provides for certain adjustments that may be made to the exercise price and the number of Shares issuable upon exercise due to customary anti-dilution provisions based on future corporate events. In addition, in connection with any consolidation, merger or similar extraordinary event involving the Company, the Warrant will be deemed to represent the right to receive, upon exercise, the same consideration received by the holders of the Company’s ordinary shares in connection with such transaction. Upon a change of control of ARRIS or if ARRIS materially breaches its separate Master Supply Agreement with Comcast (and such breach is not cured pursuant to the terms of the Master Supply Agreement), the Warrant will immediately vest for the minimum threshold of Shares that would otherwise be issuable.

ARRIS has also agreed, if requested by Comcast, to register the Shares issuable upon exercise of the Warrant under the Securities Act of 1933, as amended (the “Securities Act”) and has also granted “piggyback” registration rights in the event ARRIS files a registration statement with the U.S. Securities and Exchange Commission under the Securities Act covering its equity securities, subject to the terms and conditions included in the Warrant.

The foregoing description of the terms and conditions of the Warrant and Registration Rights Agreement is only a summary and is qualified in its entirety by the full text of the Warrant and Registration Rights Agreement, which is filed as Exhibit 4.1 to this Current Report and incorporated by reference in this Item 1.01 and Item 3.02.

The information set forth in Item 1.01 regarding the issuance of the Shares pursuant to the Warrant is incorporated into this Item 3.02 by reference. The offer and sale of such securities were made only to “accredited investors” (as defined by Rule 501 under the Securities Act) in reliance upon exemptions from registration under the Securities Act afforded by Section 4(a)(2) of the Securities Act and corresponding provisions of state securities laws. Reliance on Section 4(2) is based on the nature of the offering and sale and certain representations made by Comcast in the Warrant with respect to its investment intent and status as an accredited investor.

2

Beginning with the second quarter ended June 30, 2016, the fair value of the Warrant described above in Item 1.01 will be treated as a reduction of revenues under U.S. GAAP when achievement of purchase commitments by Comcast under each tranche are deemed probable. Upon a purchase commitment being deemed probable, ARRIS will be required to mark-to-market the fair value of each tranche of the Warrant through the final vesting dates of December 31, 2016 and 2017. The Company expects to exclude the impact of the fair value revenue adjustment in its adjusted (Non GAAP) net income.

3

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.

Date: July 5, 2016