UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 8, 2021

(561) 988-3600

(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:

¨ 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))

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) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2). Emerging growth company ¨

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. ¨

Investor Rights Agreement

On December 8, 2021, ADT Inc. (the “Company”) entered into the Investor Rights Agreement (“IRA”) with the members (the “CSG Members”) of Compass Solar Group, LLC, a Delaware limited liability company (“CSG”), and the members (the “Blocker Members”) of each of MGG SPV VIII LLC, a Delaware limited liability company (“SPV VIII”), and MGG SPV VII LLC, a Delaware limited liability company (“SPV VII” and, together with SPV VIII, the “Blockers”), party to the Purchase Agreement, dated November 8, 2021 (the “Purchase Agreement”), by and among the Company, The ADT Security Corporation, CSG, the Blockers, the CSG Members, the Blocker Members, and Compass Group Management, LLC as the Member Representative. The description of the IRA set forth in the Current Report on Form 8-K filed by the Company on November 9, 2021 is incorporated herein.

The foregoing description of the IRA does not purport to be complete and is qualified in its entirety by reference to the full text of the IRA, which will be filed with our Annual Report on Form 10-K for fiscal year 2021.

On December 9, 2021, the Company issued a press release (the “Press Release”) announcing the closing of the transaction (the “Transaction”) contemplated by the Purchase Agreement. A copy of the Press Release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

The foregoing information (including Exhibit 99.1 hereto) is being furnished under Item 7.01. Such information (including Exhibit 99.1 hereto) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

(d) Exhibits.

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 thereunto duly authorized.