Annual Report Pursuant to Section13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year endedDecember31, 2024or ADT Inc. (Exact name of registrant as specified in its charter) 47-4116383 Delaware (State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.) 1501 Yamato Road,Boca Raton,Florida,33431(561)988-3600(Address of principal executive offices, including zip code, Registrant’s telephone number, including area code) Securities registered pursuant to Section12(b) of the Act:Trading Symbol Title of each className of each exchange on which registeredCommon Stock, par value $0.01 per shareADTNew York Stock Exchange Securities registered pursuant to Section12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.Yes☒No¨ Indicate by check mark if the registrant is not required to file reports pursuant to Section13 or Section15(d) of the Act.Yes¨No☒ Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934 during thepreceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject to such filing requirements for the past 90days.Yes☒No¨ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T(§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).Yes☒No¨ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerginggrowth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of theExchange Act. Large accelerated filer☒Accelerated filer☐Non-accelerated filer☐Smaller reporting company☐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 revisedfinancial accounting standards provided pursuant to Section 13(a) of the Exchange Act.¨ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect thecorrection of an error to previously issued financial statements.¨ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of theregistrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).¨ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).Yes☐Nox As of June 30, 2024, the aggregate market value of voting and non-voting common stock (including shares of common stock and Class B common stock, assuming alloutstanding shares of Class B common stock were converted into shares of common stock) held by non-affiliates of the registrant was approximately $2.561billion ascomputed by reference to the closing price of the registrant’s common stock on the New York Stock Exchange as of such date. Class B common stock is not listed forpublic trading on any exchange or market system; however, each share will become immediately convertible into one share of common stock, at the option of the holder,subject to certain timing and restrictions. As of February20, 2025, there were821,758,736shares outstanding of the registrant’s common stock, $0.01 par value per share, and54,744,525shares outstanding ofthe registrant’s Class B common stock, $0.01 par value per share. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement for use in connection with its 2025 Annual Meeting of Shareholders, which is to be filed no later than 120 daysafter December31, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K. TABLE OF CONTENTS Cautionary Statement Regarding Forward-Looking Statements1Summary of Principal Risk Factors2 Part I Item 1.Item 1A.Item 1B.Item 1C.Item 2.Item 3.Item 4. BusinessRisk FactorsUnresolved Staff CommentsCybersecurityPropertiesLegal ProceedingsMine Safety Disclosures Part IIItem 5.Item 6.Item 7.Item 7A.Item 8.Item 9.Item 9A.Item 9B.Item 9C. Market for Registrant’s Common Equity, Related Stockholder Matters