Exhibit 1.1

[•] Shares

ADT INC.

COMMON STOCK, PAR VALUE $0.01 PER SHARE

FORM OF UNDERWRITING AGREEMENT

January [•], 2018

January [•], 2018

Morgan Stanley & Co. LLC

Goldman Sachs & Co. LLC

Barclays Capital Inc.

Deutsche Bank Securities Inc.

RBC Capital Markets, LLC

1585 Broadway

New York, New York 10036

200 West Street

New York, New York 10282

745 Seventh Avenue

New York, New York 10019

60 Wall Street

New York, NY 10005

200 Vesey Street

New York, New York 10281

Ladies and Gentlemen:

ADT Inc., a Delaware corporation (the “ Company ”), proposes to issue and sell to the several Underwriters named in Schedule I hereto (the “ Underwriters ”), for whom you are acting as representatives (the “ Representatives ”), [•] shares of its common stock, par value $0.01 per share (the “ Firm Shares ”). The Company also proposes to issue and sell to the several Underwriters not more than an additional [•] shares of its common stock, par value $0.01 per share (the “ Additional Shares ”) if and to the extent that you, as Representatives of the offering, shall have determined to exercise, on behalf of the Underwriters, the right to purchase such shares of common stock granted to the Underwriters in Section 2 hereof. The Firm Shares and the Additional Shares are hereinafter collectively referred to as the “ Shares .” The shares of common stock, par value $0.01 per share of the Company to be outstanding after giving effect to the sales contemplated hereby are hereinafter referred to as the “ Common Stock .”

The Company has filed with the Securities and Exchange Commission (the “ Commission ”) a registration statement, including a prospectus, relating to the Shares. The registration statement as amended at the time it becomes effective, including the information (if any) deemed to be part of the registration statement at the time of

effectiveness pursuant to Rule 430A under the Securities Act of 1933, as amended (the “ Securities Act ”), is hereinafter referred to as the “ Registration Statement ”; the prospectus in the form first used to confirm sales of Shares (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “ Prospectus. ” If the Company has filed an abbreviated registration statement to register the sale of additional shares of Common Stock pursuant to Rule 462(b) under the Securities Act (the “ Rule  462 (b) Registration Statement ”), then any reference herein to the term “ Registration Statement ” shall be deemed to include such Rule 462(b) Registration Statement.

For purposes of this Agreement, “ free writing prospectus ” has the meaning set forth in Rule 405 under the Securities Act, “ Time of Sale Prospectus ” means the preliminary prospectus together with the documents and pricing information set forth in Schedule II hereto, and “ broadly available road show ” means a “bona fide electronic road show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person. As used herein, the terms “Registration Statement,” “preliminary prospectus,” “Time of Sale Prospectus” and “Prospectus” shall include the documents, if any, incorporated by reference therein as of the date hereof.

The Representatives have agreed to reserve a portion of the Shares to be purchased by the Underwriters under this Agreement for sale to the Company’s directors, officers, employees and business associates and other parties related to the Company (collectively, “ Participants ”), as set forth in the Prospectus under the heading “Underwriters” (the “ Directed Share Program ”). The Shares to be sold by Morgan Stanley & Co. LLC (“ Morgan Stanley ”) and its affiliates pursuant to the Directed Share Program, at the direction of the Company, are referred to hereinafter as the “ Directed Shares .” Any Directed Shares not orally confirmed for purchase by any Participant by the end of the business day on which this Agreement is executed will be offered to the public by the Underwriters as set forth in the Prospectus. In connection with the extension of the Directed Share Program to directors, officers and employees of the Company and its affiliates who are located or resident in certain provinces of Canada, the Company hereby confirms that the Directed Share Program constitutes a plan established by the Company to provide for the acquisition of Directed Shares by such persons, and appoints Morgan Stanley to act as administrator of such plan on behalf of such persons.

1. Representations and Warranties . The Company represents and warrants to and agrees with each of the Underwriters that:

(a) The Registration Statement has become effective; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose are pending before or threatened by the Commission.

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(b) (i) The Registration Statement, when it became effective, did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) the Registration Statement and the Prospectus comply and, as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (iii) the Time of Sale Prospectus does not, and at the time of each sale of the Shares in connection with the offering when the Prospectus is not yet available to prospective purchasers and at the Closing Date (as defined in Section 4), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (iv) each broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (v) the Prospectus as of its date does not contain and, as amended or supplemented, if applicable, as of the date of such amendment or supplement will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to statements or omissions in the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through you expressly for use therein.

(c) The Company is not an “ineligible issuer” in connection with the offering pursuant to Rules 164, 405 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or, if filed after the date of this agreement, will comply, when filed, in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule II hereto, and electronic road shows, if any, each furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

(d) The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has the corporate power and authority to own its properties and conduct its business as described in the Time of Sale Prospectus and is duly qualified to do business as a foreign entity and is in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its

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business requires such qualification, except where the failure to be so qualified or in good standing would not reasonably be expected to have, individually or in the aggregate, a material adverse effect on (i) the condition (financial or otherwise), results of operations, business, properties or prospects of the Company and its subsidiaries, taken as a whole, or (ii) the ability of the Company to perform its obligations under this Agreement, including the issuance and sale of the Shares (a “ Material Adverse Effect ”).

(e) Each significant subsidiary of the Company (as such term is defined in Rule 1-02 of Regulation S-X under the Exchange Act (as defined below)) has been duly incorporated or organized and is validly existing and in good standing under the laws of the jurisdiction of its incorporation or organization, with all necessary power and authority (corporate, limited liability company or other, as applicable) to own its properties and conduct its business as described in the Time of Sale Prospectus; and each significant subsidiary of the Company is duly qualified to do business as a foreign corporation or other entity and is in good standing in all other jurisdictions in which its ownership or leasing of property or the conduct of its business requires such qualification, except where the failure to be so qualified and in good standing would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect; all of the issued and outstanding shares of capital stock or membership interests of each significant subsidiary of the Company have been duly authorized and validly issued and are fully paid and non-assessable; and the capital stock or membership interests of each significant subsidiary owned by the Company, directly or through subsidiaries, is owned free from liens, encumbrances and defects except liens, encumbrances or defects in place as of the date hereof and described in the Time of Sale Prospectus. The entities listed on Schedule IV hereto are the only significant subsidiaries, direct or indirect, of the Company.

(f) The authorized capital stock of the Company conforms as to legal matters to the description thereof contained in each of the Time of Sale Prospectus and the Prospectus.

(g) The shares of Common Stock outstanding prior to the issuance of the Shares to be sold by the Company in the offering have been duly authorized and are validly issued, fully paid and non-assessable.

(h) The Shares to be sold by the Company in the offering have been duly authorized and, when issued and delivered in accordance with the terms of this Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares will not be subject to any preemptive or similar rights.

(i) Except as disclosed in the Time of Sale Prospectus, there are no contracts, agreements or understandings between the Company and any person other than the Underwriters that would give rise to a valid claim against the Company or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection with the issuance and sale of the Shares.

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(j) Except with respect to the registration right agreement by and between the Company and the Ultimate Parent (as defined in the Time of Sale Prospectus) to be entered into in connection with the consummation of the offering, as disclosed in the Time of Sale Prospectus and the Prospectus, there are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company or to require the Company to include such securities with the Shares registered pursuant to the Registration Statement.

(k) No consent, approval, authorization, or order of, or filing or registration with, any governmental agency or body or any court is required for the consummation of the transactions contemplated by this Agreement in connection with the offering, issuance and sale of the Shares by the Company except for (i) such as may be required under the Securities Act, the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or the regulations thereunder, state securities or “Blue Sky” laws or the rules and regulations of the Financial Industry Regulatory Authority, in each case, in connection with the offering purchase and sale of the Shares, or (ii) where the failure to obtain or make such consent, approval, authorization, order, filing or registration would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect.

(l) Except as disclosed in the Time of Sale Prospectus, the Company and its subsidiaries have good and marketable fee simple title to all of their owned real properties, valid and marketable leasehold interests in all of their leased real properties and good title to all other properties and assets owned by them, in each case, free from liens, encumbrances and defects that would reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect; and except as would not constitute a Material Adverse Effect, and except as disclosed in the Time of Sale Prospectus, the Company and its subsidiaries hold any leased real or personal property under valid and enforceable leases with no terms or provisions that would interfere with the use made or to be made thereof by them.

(m) The execution, delivery and performance by the Company of its obligations under this Agreement, and the issuance and sale of the Shares, will not result in a breach or violation of any of the terms and provisions of, or constitute a default under (i) the charter or by-laws of any of the Company and its subsidiaries, (ii) any statute or any rule, regulation or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over any of the Company, or its subsidiaries or any of their properties, or (iii) any agreement or instrument to which any of the Company and its subsidiaries is a party or by which any of the Company and its subsidiaries is bound or to which any of the properties of the Company and its subsidiaries is subject, except, in the cases of clauses (ii) and (iii) above, where such breach, violation or default would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect.

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(n) None of the Company or its subsidiaries is (i) in violation of its respective organizational documents or (ii) in default under any existing obligation agreement, covenant or condition contained in any indenture, loan agreement, mortgage, lease or other agreement or instrument to which any of them is a party or by which any of them or their respective property is bound, except for such violation or default that would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect.

(o) This Agreement has been duly authorized, executed and delivered by the Company.

(p) The Company and its subsidiaries possess all adequate certificates, authorities or permits issued by appropriate governmental agencies or bodies necessary to conduct the business operated by them, where the lack of such certificates, authorities and permits would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect, and have not received any notice of proceedings relating to the revocation or modification of any such certificate, authority or permit that would reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect, subject in each case to such qualification as may be set forth in the Time of Sale Prospectus and the Prospectus.

(q) No labor dispute with the employees of the Company or any of its Subsidiaries exists or, to the knowledge of the Company, is imminent or threatened that would reasonably be expected to have, individually or in the aggregate, to have a Material Adverse Effect. Neither the Company nor any of its Subsidiaries has received any notice of cancellation or termination with respect to any collective bargaining agreement to which it is a party.

(r) The Company and its subsidiaries (i) own or have the right to use trademarks, trade names and other rights to inventions, know how, patents, copyrights, confidential information and other intellectual property (collectively, “ Intellectual Property Rights ”) necessary to conduct the business now operated by them, except where the lack of which would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect, and (ii) have not received any notice of infringement of or conflict with asserted rights of others with respect to Intellectual Property Rights that could reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect.

(s) (i)(x) There has been no material security breach or other compromise of or relating to any of the Company’s or its subsidiaries’ information technology and computer systems, networks, hardware, software, data (including the data of their respective customers, employees, dealers, suppliers, vendors and any third party data maintained by or on behalf of them), equipment or technology (collectively, “ IT Systems and Data ”) and (y) the Company and its subsidiaries have not been notified of, and have no knowledge of any event or condition that would reasonably be expected to result in, any

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security breach or other compromise to their IT Systems and Data that would have a Material Adverse Effect; and (ii) the Company and its subsidiaries are presently in compliance with all applicable laws or statutes and all judgments, orders, rules and regulations of any court or arbitrator or governmental or regulatory authority, internal policies and contractual obligations relating to the privacy and security of IT Systems and Data and to the protection of such IT Systems and Data from unauthorized use, access, misappropriation or modification, except as would not, in the case of this clause (ii), have a Material Adverse Effect.

(t) Except as disclosed in the Time of Sale Prospectus, neither the Company nor its subsidiaries: (i) is in violation of any statute, any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over any of the Company or its subsidiaries, relating to the use, disposal or release of hazardous or toxic substances, wastes, pollutants or contaminants (including, without limitation, asbestos, polychlorinated biphenyls, fertilizers, pesticides, fungicides, petroleum or petroleum products) (collectively, “ Hazardous Materials ”) or relating to the protection or restoration of the environment or human exposure to Hazardous Materials (collectively, “ environmental laws ”), (ii) owns, leases or operates any real property contaminated with any Hazardous Materials, (iii) is liable for any off-site disposal or contamination pursuant to any environmental laws, or (iv) is subject to any pending or threatened claim relating to any environmental law, which violation, contamination, liability or claim would reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect; and the Company is not aware of any pending investigation, conditions, fact or circumstances that would reasonably be expected to result in any violation of, liability under, or claim pursuant to any environmental laws that would reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect. Except as disclosed in the Time of Sale Prospectus: (i) there are no proceedings that are pending or known to be contemplated against the Company or any of its subsidiaries under any environmental laws in which a governmental authority is also a party, other than such proceedings regarding which it is reasonably believed that monetary sanctions of $100,000 or more will not be imposed; and (ii) none of the Company or its subsidiaries anticipates material capital expenditures relating to environmental laws.

(u) The statements in the Registration Statement under the headings “Material U.S. Federal Income Tax Considerations” and “Description of Capital Stock” insofar as such statements summarize legal matters, agreements, documents or proceedings discussed therein, are accurate and fair summaries of such legal matters, agreements, documents or proceedings and present the information required to be shown in all material respects.

(v) Neither the Company nor any of its subsidiaries has taken, directly or indirectly, any action designed to or that might reasonably be expected to cause or result in the manipulation of the price of the Shares to facilitate the sale of the Shares.

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(w) Nothing has come to the attention of the Company that has caused the Company to believe that the statistical and market-related data included in the Registration Statement, the Time of Sale Prospectus, the Prospectus and the broadly available roadshow are not based on or derived from estimates and sources that are reliable and accurate in all material respects.

(x) The Company and each of its consolidated subsidiaries maintains a system of internal accounting controls over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as described in the Time of Sale Prospectus, since the end of the Company’s most recent audited fiscal year, there has been (i) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

(y) The Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Exchange Act) that comply with the requirements of the Exchange Act; such disclosure controls and procedures have been designed to ensure that material information relating to the Company and its subsidiaries is made known to the Company’s principal executive officer and principal financial officer by others within those entities; and such disclosure controls and procedures are effective.

(z) Except as disclosed in the Time of Sale Prospectus, (a) there are no pending actions, suits or proceedings (including any inquiries or investigations by any court or governmental agency or body, domestic or foreign) (i) against or affecting the Company or its subsidiaries or any of their respective properties that would reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect, or (ii) that are required to be described in the Registration Statement or the Prospectus and are not so described, and to the knowledge of the Company, no such actions, suits or proceedings are threatened and (b) there are no statutes, regulations, contracts or other documents to which the Company is subject or by which the Company is bound that are required to be described in the Registration Statement or the Prospectus or to be filed as exhibits to the Registration Statement that are not so described or filed as required.

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(aa) The financial statements of the Company, The ADT Corporation, Protection One, Inc. and Alarm Security Holdings LLC (collectively, the “ Relevant Entities ”) included in the Registration Statement, the Prospectus and the Time of Sale Prospectus comply in all material respects with the applicable requirements of the Securities Act and present fairly in all material respects the financial position of such companies and their respective subsidiaries on a consolidated basis as of the dates shown and their results of operations and cash flows for the periods shown, and such financial statements have been prepared in conformity with the generally accepted accounting principles in the United States applied on a consistent basis; the supporting schedules, if any, included in the Registration Statement present fairly in all material respects, in accordance with GAAP, the information required to be stated therein; the other financial information included in the Registration Statement, the Time of Sale Prospectus and the Prospectus has been derived from the applicable accounting or other records of the Relevant Entities and presents fairly in all material respects the information shown thereby; the pro forma and supplemental pro forma financial statements (including the notes thereto) or other pro forma and supplemental pro forma financial information included in the Registration Statement, the Prospectus and the Time of Sale Prospectus (A) comply as to form in all material respects with the applicable requirements of Regulation S-X (except with respect to the supplemental pro forma financial statements and other supplemental pro forma information), (B) have been prepared in accordance with the Commission’s applicable rules and guidelines with respect to pro forma financial statements (except with respect to the supplemental pro forma financial statements and other supplemental pro forma information) and (C) have been properly computed and presented on the bases described therein; and the assumptions used in preparing the pro forma and supplemental pro forma financial statements or other pro forma and supplemental pro forma financial information included in the Registration Statement, the Prospectus and the Time of Sale Prospectus provide a reasonable basis for presenting the significant effects directly attributable to the transactions or events described therein, the related pro forma and supplemental pro forma adjustments give appropriate effect to those assumptions, and the pro forma and supplemental pro forma columns therein reflect the proper application of those adjustments to the corresponding historical financial statement amounts.

(bb) Except as disclosed in the Time of Sale Prospectus, since the end of the period covered by the latest audited date of the most recent financial statements of the Company included in each of the Registration Statement, the Time of Sale Prospectus and the Prospectus, (i) there has been no change, nor any development or event involving a prospective change, in the condition (financial or otherwise), results of operations, business or properties of the Company and its subsidiaries, taken as a whole, that is material and adverse; (ii) the Company has not purchased any of its outstanding capital stock, other than from its employees or other service providers in connection with the termination of their services pursuant to compensation plans or agreements described in the Time of Sale Prospectus, and there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock (other than any

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payment-kind declared on the Koch Preferred Securities (as defined in the Time of Sale Prospectus)); (iii) there has been no material change in the capital stock, short-term indebtedness, long-term indebtedness, net current assets or net assets of the Company and its subsidiaries; and (iv) the Company and its subsidiaries have not incurred any material liability or obligations, direct or contingent, nor entered into any material transactions.

(cc) The Company is not, and after giving effect to the offering and sale of the Shares and the application of the proceeds thereof as described in the Prospectus will not be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended.

(dd) (i) None of the Company or its subsidiaries or affiliates, or any director or executive officer thereof or, to the Company’s knowledge, any employee, agent or representative of the Company or of any of its subsidiaries or affiliates, has taken or will take any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment, giving or receipt of money, property, gifts or anything else of value, directly or indirectly, to any government official (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) (“ Government Official ”) in order to influence official action, or to any person in violation of any applicable anti-corruption laws; (ii) the Company and its subsidiaries and affiliates have conducted their businesses in compliance with applicable anti-corruption laws and have instituted and maintained and will continue to maintain policies and procedures reasonably designed to promote and achieve compliance with such laws and with the representations and warranties contained herein; and (iii) neither the Company nor its subsidiaries will use, directly or indirectly, the proceeds of the offering in furtherance of an offer, payment, promise to pay, or authorization of the payment or giving of money, or anything else of value, to any person in violation of any applicable anti-corruption laws.

(ee) The operations of the Company and its subsidiaries are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting laws and regulations, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and the applicable anti-money laundering statutes of jurisdictions where the Company and its subsidiaries conduct business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “ Anti-Money Laundering Laws ”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

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(ff) (i) None of the Company, any of its subsidiaries, or any director, officer, or employee thereof, or, to the Company’s knowledge, any agent, affiliate or representative of the Company or any of its subsidiaries, is an individual or entity that is, or is owned or controlled by one or more persons that are:

(A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control (“ OFAC ”) , the United Nations Security Council (“ UNSC ”), the European Union (“ EU ”), Her Majesty’s Treasury (“ HMT ”), or other relevant sanctions authority (collectively, “ Sanctions ”), or

(B) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Crimea, Cuba, Iran, North Korea and Syria).

(ii) The Company will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person:

(A) to fund or facilitate any activities or business of or with any person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or

(B) in any other manner that will result in a violation of Sanctions by any person (including any person participating in the offering, whether as underwriter, advisor, investor or otherwise).

(iii) For the past 5 years, the Company and its subsidiaries have not knowingly engaged in, are not now knowingly engaged in, any dealings or transactions with any person, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions.

(gg) Except as would not, individually or in the aggregate reasonably be expected to have a Material Adverse Effect: (a) the Company and its subsidiaries have filed all U.S. federal, state and local and non-U.S. tax returns that are required to be filed (taking into account valid filing extensions) and (b) the Company and its subsidiaries have paid all taxes (including in the capacity of a withholding agent) required to be paid by them (including any interest, additions to tax or penalties), except for any such amounts currently being contested in good faith by appropriate proceedings diligently conducted and for which the Company has established adequate reserves in accordance with GAAP.

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(hh) The Company and its subsidiaries are insured by insurers with appropriately rated claims paying abilities against such losses and risks and in such amounts as are customary for the businesses in which they are engaged; all policies of insurance insuring the Company or its subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect except as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; the Company and its subsidiaries are in compliance with the terms of such policies and instruments in all material respects; there are no claims by the Company or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause except for any claims in respect of matters set forth in or reasonably contemplated by the Time of Sale Prospectus; neither the Company nor any subsidiary has been refused any insurance coverage sought or applied for or has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business except as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, or as set forth in or contemplated in the Time of Sale Prospectus.

(ii) (i) PricewaterhouseCoopers LLP, which expressed its opinion with respect to the financial statements (which term as used in this Agreement includes the related notes thereto) of the Company and Protection One, Inc. included in the Registration Statement, the Prospectus and the Time of Sale Prospectus is an independent registered public accounting firm with respect to the Company and Protection One, Inc. under the Securities Act and the rules and regulations of the Commission thereunder, (ii) Deloitte & Touche LLP, which expressed its opinion with respect to the financial statements (which term as used in this Agreement includes the related notes thereto) of The ADT Corporation included in the Registration Statement, the Prospectus and the Time of Sale Prospectus is an independent registered public accounting firm with respect to The ADT Corporation and its subsidiaries within the Securities Act and the rules and regulations of the Commission thereunder; and (iii) Ernst & Young LLP, which expressed its opinion with respect to the financial statements (which term as used in this Agreement includes the related notes thereto) of Alarm Security Holdings LLC included in the Registration Statement, the Prospectus and the Time of Sale Prospectus is an independent auditor with respect to Alarm Security Holdings LLC under Rule 101 of The American Institute of Certified Public Accountants Code of Professional Conduct and its interpretations and rulings.

(jj) The Company, its subsidiaries and any “employee benefit plan” (as defined under the Employee Retirement Income Security Act of 1974 (as amended, “ERISA,” which term, as used herein, includes the regulations and published interpretations thereunder)) established or maintained by the Company, its subsidiaries or their ERISA Affiliates (as defined below) are in compliance with ERISA and, to the knowledge of the Company, each “multiemployer plan” (as defined in Section 4001 of ERISA) to which the Company, its subsidiaries or

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an ERISA Affiliate contributes (a “Multiemployer Plan”) is in compliance with ERISA, except, in each case, where any failure to comply would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect. “ERISA Affiliate” means, with respect to any of the Company or a subsidiary, any member of any group of organizations described in Section 414 of the Internal Revenue Code of 1986 (as amended, the “Code,” which term, as used herein, includes the regulations and published interpretations thereunder) of which the Company or such subsidiary is a member. No “reportable event” (as defined under Section 4043(c) of ERISA) has, within the past six (6) years, occurred or is reasonably expected to occur with respect to any “employee benefit plan” established or maintained by the Company, its subsidiaries or any of their ERISA Affiliates that would reasonably be expected to result in a Material Adverse Effect. No “single employer plan” (as defined in Section 4001 of ERISA) established or maintained by the Company, its subsidiaries or any of their ERISA Affiliates, if such “employee benefit plan” were terminated, would have any amount of unfunded “benefit liabilities” (as defined under Section 4001(a)(16) of ERISA) that in the aggregate would reasonably be expected to result in a Material Adverse Effect. None of the Company, its subsidiaries or any of their ERISA Affiliates has, within the past six (6) years, incurred or reasonably expects to incur any liability under (i) Title IV of ERISA with respect to termination of, or withdrawal from, any “employee benefit plan” or (ii) Sections 412, 4971, 4975 or 4980B of the Code or Section 4062(e) of ERISA that individually or in the aggregate would reasonably be expected to result in a Material Adverse Effect. Each “employee benefit plan” established or maintained by the Company, its subsidiaries or any of their ERISA Affiliates that is intended to be qualified under Section 401 of the Code is so qualified and nothing has occurred, within the past six (6) years, whether by action or failure to act, that would reasonably be expected to cause the loss of such qualification to the extent any lack of qualified status or loss of qualified status would, individually or in the aggregate, reasonably be expected to result in an Material Adverse Effect.

(kk) Except as described in the Time of Sale Prospectus, the Company has not sold, issued or distributed any shares of Common Stock during the six-month period preceding the date hereof, including any sales pursuant to Rule 144A under, or Regulation D or S of, the Securities Act, other than shares issued pursuant to employee benefit plans, qualified stock option plans or other employee compensation plans or pursuant to outstanding options, rights or warrants.

(ll) No subsidiary of the Company is currently prohibited (except as may be limited by applicable laws of the jurisdiction of such subsidiary’s incorporation or formation), directly or indirectly, under any agreement or other instrument to which it is a party or is subject, from paying any dividend to the Company, from making any other distribution on such subsidiary’s capital stock, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any such subsidiary’s properties or assets to the Company or any subsidiary of the Company, except in each case as disclosed in the Time of Sale Prospectus and the Prospectus.

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(mm) Each preliminary prospectus filed as part of the registration statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder.

(nn) Except as described in the Time of Sale Prospectus and Prospectus, the Company and its subsidiaries, (A) are in compliance with any and all applicable laws, rules, regulations, and regulatory requirements or court decrees relating to consumer protection or purchase finance or other regulations applicable to the business of the Company as currently conducted or contemplated to be conducted, except to the extent that the failure to comply would not reasonably be expected to have a Material Adverse Effect (such laws, rules and regulations, the “ Regulatory Laws ”), (B) have received all federal and state permits, licenses and other approvals required of them under applicable Regulatory Laws to conduct their respective businesses, except where the failure to receive such permits, licenses and other approvals would not reasonably be expected to have a Material Adverse Effect and (C) are in compliance with all terms and conditions of any such permit, license or approval, except where such noncompliance with Regulatory Laws could not reasonably be expected have a Material Adverse Effect; and except as described in the Time of Sale Prospectus, the Company is not aware of any material changes proposed or contemplated to be made to any of the Regulatory Laws that could reasonably be expected to have a Material Adverse Effect.

(oo) The Registration Statement, the Prospectus, the Time of Sale Prospectus and any preliminary prospectus (including any applicable Canadian offering memorandum) comply, and any amendments or supplements thereto will comply, with any applicable laws or regulations of foreign jurisdictions in which the Prospectus, the Time of Sale Prospectus or any preliminary prospectus (including any applicable Canadian offering memorandum), as amended or supplemented, if applicable, are distributed in connection with the Directed Share Program.

(pp) No consent, approval, authorization or order of, or qualification with, any governmental body or agency, other than those obtained, is required to be obtained by the Company in connection with the offering of the Directed Shares in any jurisdiction where the Directed Shares are being offered.

(qq) The Company has not offered, or caused Morgan Stanley or any Morgan Stanley Entity as defined in Section 9 to offer, Shares to any person pursuant to the Directed Share Program with the specific intent to unlawfully influence (i) a customer or supplier of the Company to alter the customer’s or supplier’s level or type of business with the Company, or (ii) a trade journalist or publication to write or publish favorable information about the Company or its products.

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2. Agreements to Sell and Purchase. The Company hereby agrees to sell to the several Underwriters, and each Underwriter, upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, agrees, severally and not jointly, to purchase from the Company the respective numbers of Firm Shares set forth in Schedule I hereto opposite its name at $[•] a share (the “ Purchase Price ”).

On the basis of the representations and warranties contained in this Agreement, and subject to its terms and conditions, the Company agrees to sell to the Underwriters the Additional Shares, and the Underwriters shall have the right to purchase, severally and not jointly, up to [•] Additional Shares at the Purchase Price, provided, however, that the amount paid by the Underwriters for any Additional Shares shall be reduced by an amount per share equal to any dividends declared by the Company and payable on the Firm Shares but not payable on such Additional Shares. You may exercise this right on behalf of the Underwriters in whole or from time to time in part by giving written notice not later than 30 days after the date of this Agreement. Any exercise notice shall specify the number of Additional Shares to be purchased by the Underwriters and the date on which such shares are to be purchased. Each purchase date must be at least one business day after the written notice is given and may not be earlier than the closing date for the Firm Shares nor later than ten business days after the date of such notice. Additional Shares may be purchased as provided in Section 4 hereof solely for the purpose of covering over-allotments made in connection with the offering of the Firm Shares. On each day, if any, that Additional Shares are to be purchased (an “ Option Closing Date ”), each Underwriter agrees, severally and not jointly, to purchase the number of Additional Shares (subject to such adjustments to eliminate fractional shares as you may determine) that bears the same proportion to the total number of Additional Shares to be purchased on such Option Closing Date as the number of Firm Shares set forth in Schedule I hereto opposite the name of such Underwriter bears to the total number of Firm Shares.

3. Terms of Public Offering . The Company is advised by you that the Underwriters propose to make a public offering of their respective portions of the Shares as soon after the Registration Statement and this Agreement have become effective as in your judgment is advisable. The Company is further advised by you that the Shares are to be offered to the public initially at $[•] a share (the “ Public Offering Price ”) and to certain dealers selected by you at a price that represents a concession not in excess of $[•] a share under the Public Offering Price, and that any Underwriter may allow, and such dealers may reallow, a concession, not in excess of $[•] a share, to any Underwriter or to certain other dealers.

4. Payment and Delivery. Delivery of the Firm Shares shall be made to the Representatives for the respective accounts of the several Underwriters against payment by the several Underwriters through the Representatives in Federal or of funds immediately available in New York City to the account specified by the Company at 10:00 a.m., New York City time, on January [•], 2018, or at such other time on the same or such other date, not later than January [•], 2018, as shall be designated in writing by you. The time and date of such payment are hereinafter referred to as the “ Closing Date .”

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Delivery of any Additional Shares shall be made to the Company in Federal or other funds immediately available in New York City against payment of such Additional Shares for the respective accounts of the several Underwriters at 10:00 a.m., New York City time, on the date specified in the corresponding notice described in Section 2 or at such other time on the same or on such other date, in any event not later than February [•], 2018, as shall be designated in writing by you.

The Firm Shares and Additional Shares shall be registered in such names and in such denominations as you shall request in writing not later than one full business day prior to the Closing Date or the applicable Option Closing Date, as the case may be. The Firm Shares and Additional Shares shall be delivered to you on the Closing Date or an Option Closing Date, as the case may be, for the respective accounts of the several Underwriters, with any transfer taxes payable in connection with the transfer of the Shares to the Underwriters duly paid, against payment of the Purchase Price therefor. Delivery of the Shares shall be made through the Facilities of The Depository Trust Company unless the Representatives shall otherwise instruct.

5. Conditions to the Underwriters ’ Obligations . The obligations of the Company to sell the Shares to the Underwriters and the several obligations of the Underwriters to purchase and pay for the Shares on the Closing Date are subject to the condition that the Registration Statement shall have become effective not later than [•] [a.m.] [p.m.] (New York City time) on the date hereof.

The several obligations of the Underwriters are subject to the following further conditions:

(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date:

(i) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any of the securities of the Company, or any of its subsidiaries by any “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act; and

(ii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus that, in your judgment, is material and adverse and that makes it, in your judgment, impracticable to market the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus.

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(b) The Underwriters shall have received on the Closing Date a certificate, dated the Closing Date and signed by an executive officer of the Company, to the effect set forth in Section 5(a)(i) above and to the effect that the representations and warranties of the Company contained in this Agreement are true and correct as of the Closing Date and that the Company has complied in all material respects with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

The officer signing and delivering such certificate may rely upon his or her knowledge as to proceedings threatened.

(c) The Underwriters shall have received on the Closing Date an opinion and negative assurance letter of Paul, Weiss, Rifkind, Wharton & Garrison LLP, outside counsel for the Company, dated the Closing Date, in form and substance reasonably satisfactory to the Representatives to the effect set forth in Annex A.

(d) The Underwriters shall have received on the Closing Date an opinion and negative assurance letter of Simpson Thacher & Bartlett LLP, counsel for the Underwriters, dated the Closing Date, in form and substance reasonably satisfactory to you.

(e) The Underwriters shall have received, on each of the date hereof and the Closing Date, a letter dated the date hereof or the Closing Date, as the case may be, in form and substance satisfactory to the Underwriters, from each of PricewaterhouseCoopers LLP, Deloitte & Touche LLP and Ernst & Young LLP, independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus; provided that any letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

(f) The Underwriters shall have received, on the date hereof and on the Closing Date, a certificate of the Chief Financial Officer of the Company, in his capacity as an officer of the Company and not in his individual capacity, in form and substance reasonably satisfactory to you, with respect to certain information contained in the Time of Sale Prospectus and the Prospectus.

(g) The “lock-up” agreements, each substantially in the form of Exhibit A hereto, between you and the shareholders, officers and directors of the Company, listed on Schedule III relating to sales and certain other dispositions of shares of Common Stock or certain other securities, delivered to you on or before the date hereof, shall be in full force and effect on the Closing Date.

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(h) The several obligations of the Underwriters to purchase Additional Shares hereunder are subject to the delivery to you on the applicable Option Closing Date of the following:

(i) a certificate, dated the Option Closing Date and signed by an executive officer of the Company, confirming that the certificate delivered on the Closing Date pursuant to Section 5(b) hereof remains true and correct as of such Option Closing Date;

(ii) an opinion of Paul, Weiss, Rifkind, Wharton & Garrison LLP, outside counsel for the Company, dated the Option Closing Date, relating to the Additional Shares to be purchased on such Option Closing Date and otherwise to the same effect as the opinion required by Section 5(c) hereof;

(iii) an opinion of Simpson Thacher & Bartlett LLP, counsel for the Underwriters, dated the Option Closing Date, relating to the Additional Shares to be purchased on such Option Closing Date and otherwise to the same effect as the opinion required by Section 5(d) hereof;

(iv) a letter dated the Option Closing Date, in form and substance satisfactory to the Underwriters, from each of PricewaterhouseCoopers LLP, Deloitte & Touche LLP and Ernst & young LLP, independent public accountants, substantially in the same form and substance as the letter furnished by each to the Underwriters pursuant to Section 5(e) hereof; provided that any letter delivered on the Option Closing Date shall use a “cut-off date” not earlier than three business days prior to such Option Closing Date;

(v) a certificate of the Chief Financial Officer, of the Company, in his capacity as an officer of the Company and not in his individual capacity, dated the Option Closing Date, substantially in the same form and substance as the letter furnished to the Underwriters pursuant to Section 6(f) hereof, with respect to certain information contained in the Time of Sale Prospectus and the Prospectus; and

(vi) such other documents as you may reasonably request with respect to the good standing of the Company, the due authorization and issuance of the Additional Shares to be sold on such Option Closing Date and other matters related to the issuance of such Additional Shares as are customary.

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6. Covenants of the Company . The Company covenants with each Underwriter as follows:

(a) To furnish to you, without charge and upon request, three signed copies of the Registration Statement (including exhibits thereto) and for delivery to each other Underwriter a conformed copy of the Registration Statement (without exhibits thereto) and to furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the business day next succeeding the date of this Agreement and during the period mentioned in Section 6(e) or 6(f) below, as many copies of the Time of Sale Prospectus, the Prospectus and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

(b) Before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to you a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which you promptly reasonably object in writing, and to file with the Commission within the applicable period specified in Rule 424(b) under the Securities Act any prospectus required to be filed pursuant to such Rule.

(c) To furnish to you a copy of each proposed free writing prospectus to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which you reasonably object.

(d) Not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

(e) If the Time of Sale Prospectus is being used to solicit offers to buy the Shares at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the reasonable opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, forthwith, subject to Section 6(b) above, to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when the Time of Sale Prospectus is delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law.

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(f) If, during such period after the first date of the public offering of the Shares as in the reasonable opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, not misleading, or if, in the reasonable opinion of counsel for the Underwriters, it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith, subject to Section 6(b) above, to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to the dealers (whose names and addresses you will furnish to the Company) to which Shares may have been sold by you on behalf of the Underwriters and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law.

(g) To use commercially reasonable efforts to qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request; provided, however, that nothing contained herein shall require the Company or any of its subsidiaries to qualify to do business in any jurisdiction, to execute a general consent to service of process in any jurisdiction or to subject itself to taxation in any jurisdiction in which it is not otherwise subject.

(h) To make generally available to the Company’s security holders and to you as soon as practicable an earnings statement covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder; provided, that the Company will be deemed to have furnished such statements to its security holders to the extent it is filed in the Commission’s Electronic Data Gathering, Analysis and Retrieval system (“ EDGAR ”).

(i) To comply with all applicable securities and other laws, rules and regulations in each jurisdiction in which the Directed Shares are offered in connection with the Directed Share Program.

(j) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees, disbursements and expenses of the Company’s counsel and the Company’s accountants in connection with the registration and delivery of the Shares under the Securities Act and all other fees or expenses in connection with the preparation and filing of the Registration Statement, any preliminary

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prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company and amendments and supplements to any of the foregoing, including all printing costs associated therewith, and the mailing and delivering of copies thereof to the Underwriters and dealers, in the quantities hereinabove specified, (ii) all costs and expenses related to the transfer and delivery of the Shares to the Underwriters, including any transfer or other taxes payable thereon, (iii) the cost of printing or producing any Blue Sky or Legal Investment memorandum in connection with the offer and sale of the Shares under state securities laws and all expenses in connection with the qualification of the Shares for offer and sale under state securities laws as provided in Section 6(g) hereof, including filing fees and the reasonable and documented fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky or Legal Investment memorandum (not to exceed $10,000), (iv) all filing fees and the reasonable and documented fees and disbursements of counsel to the Underwriters incurred in connection with the review and qualification of the offering of the Shares by the Financial Industry Regulatory Authority (not to exceed $25,000), (v) all fees and expenses in connection with the preparation and filing of the registration statement on Form 8-A relating to the Common Stock and all costs and expenses incident to listing the Shares on the NYSE, (vi) the cost of printing certificates representing the Shares, (vii) the costs and charges of any transfer agent, registrar or depositary, (viii) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Shares, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the officers of the Company and any such consultants, and one-half of the cost of any aircraft chartered in connection with the road show (the remaining half of the cost to be borne by the Underwriters), (ix) the document production charges and expenses associated with printing this Agreement, (x) all reasonable and documented fees and disbursements of counsel incurred by the Underwriters in connection with the Directed Share Program and stamp duties, similar taxes or duties or other taxes, if any, incurred by the Underwriters in connection with the Directed Share Program and (xi) all other costs and expenses incident to the performance of the obligations of the Company hereunder for which provision is not otherwise made in this Section. It is understood, however, that except as provided in this Section, Section 8 entitled “Indemnity and Contribution”, Section 9 entitled “Directed Share Program Indemnification” and the last paragraph of Section 11 below, the Underwriters will pay all of their costs and expenses, including fees and disbursements of their counsel, travel and lodging expenses of the Underwriters (except as otherwise set forth in clause (viii) of this paragraph with respect to one half of the cost related to any chartered aircraft), stock transfer taxes payable on resale of any of the Shares by them and any advertising expenses connected with any offers they may make.

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The Company also covenants with each Underwriter that, without both (i) the prior written consent of Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC and (ii) the prior written notice to the other Representatives, it will not, during the period ending 180 days after the date of the Prospectus (the “ Restricted Period ”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (3) file or confidentially submit any registration statement with the Commission relating to the offering of any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock (provided that confidential or non-public submissions to the Commission of any registration statements under the Securities Act may be made if and only if (w) no public announcement of such confidential or non-public submission shall be made, (x) if any demand was made for, or any right exercised with respect to, such registration of shares of Common Stock or securities convertible, exercisable or exchangeable into Common Stock, no public announcement of such demand or exercise of rights shall be made, (y) the Company shall provide written notice at least two business days prior to such confidential or non-public submission to each of Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC and (z) no such confidential or non-public submission shall become a publicly available registration statement during the Restricted Period).

The restrictions contained in the preceding paragraph shall not apply to (a) the Shares to be sold hereunder, (b) the issuance by the Company of shares of Common Stock upon the exercise of an option or warrant or the conversion of a security outstanding on the date hereof, including in connection with any exercise or vesting of any restricted stock unit granted under any equity compensation plan or other agreement described in the Time of Sale Prospectus, (c) the grant of options or any other stock based awards or restricted stock units pursuant to any equity compensation plan, employment contract, benefit plan or other arrangement and described in the Time of Sale Prospectus, provided that, prior to such issuance or grant, to the extent that any such securities will become vested during the Restricted Period, the Company shall cause each recipient of such grant or issuance to execute and deliver a “lock-up” agreement substantially in the form of Exhibit A hereto, (d) the filing of any registration statements on Form S-8 with the Commission with respect to shares of Common Stock issued or issuable under any equity compensation plan described in the Time of Sale Prospectus, (e) the establishment of a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Common Stock, provided that in respect of clause (e), (i) such plan does not provide for the transfer of Common Stock during the Restricted Period and (ii) to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of Common Stock may be made under such plan during the Restricted Period or (f) the entry into an agreement providing for the issuance of Common Stock or any securities convertible into

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or exercisable for Common Stock, and the issuance of any such securities pursuant to such an agreement, in connection with (i) the acquisition by the company or any of its subsidiaries of the securities, business, property or other assets of another person or entity, including pursuant to an employment benefit assumed by the Company in connection with such acquisition, or (ii) joint ventures, commercial relationships or other strategic transactions, provided that the aggregate number of shares of Common Stock issued or issuable pursuant to this clause (f) shall not exceed 5% of the total number of shares of Common Stock issued and outstanding immediately following the offering of the Shares pursuant to this Agreement and provided further that the Company shall cause each recipient of such shares to execute and deliver to the Representatives, on or prior to such issuance, a “lock-up” agreement, substantially in the form of Exhibit A hereto.

If the restrictions set forth in a lock-up letter described in Section 5(f) hereof are released or waived in accordance with the Release Conditions (as defined therein) for an officer or director of the Company, and the applicable Representatives provide the Company with notice of the impending release or waiver at least three business days before the effective date of the release or waiver as set forth therein, the Company agrees to announce the impending release or waiver by a press release substantially in the form of Exhibit B hereto through a major news service at least two business days before the effective date of the release or waiver.

7. Covenants of the Underwriters . Each Underwriter severally covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter.

8. Indemnity and Contribution. (a) The Company agrees to indemnify and hold harmless each Underwriter, each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of any Underwriter within the meaning of Rule 405 under the Securities Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus or any amendment or supplement thereto, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, any road show as defined in Rule 433(h) under the Securities Act (a “road show”), or the Prospectus or any amendment or supplement thereto, caused by (i) in the case of any preliminary prospectus, the Time of Sale Prospectus or any amendment or supplement thereto, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, or any road show, any omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not

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misleading, and (ii) in the case of the Registration Statement or any amendment thereof, any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon any Underwriter Information.

(b) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to such Underwriter, but only with reference to information relating to such Underwriter furnished to the Company in writing by or on behalf of such Underwriter or through you expressly for use in the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus, road show or the Prospectus or any amendment or supplement thereto, it being understood and agreed that the only such information consists of [third, eighth and thirteenth paragraphs and the first sentence of the fourteenth paragraph in the Time of Sale Prospectus under the heading “Underwriting (Conflict of Interest)” (such information, the “ Underwriter Information ”).]

(c) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 8(a) or 8(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the reasonably incurred and documented fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be reimbursed as they are incurred. Such firm shall be designated in writing by the Representatives, in the case of parties indemnified pursuant to Section 8(a), and by the Company, in the case of parties indemnified pursuant to Section 8(b). The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be

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a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding.

(d) To the extent the indemnification provided for in Section 8(a) or 8(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the offering of the Shares or (ii) if the allocation provided by clause 8(d)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 8(d)(i) above but also the relative fault of the Company on the one hand and of the Underwriters on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other hand in connection with the offering of the Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Shares (before deducting expenses) received by the Company and the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover of the Prospectus, bear to the aggregate Public Offering Price of the Shares. The relative fault of the Company on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters’ respective obligations to contribute pursuant to this Section 8 are several in proportion to the respective number of Shares they have purchased hereunder, and not joint.

(e) The Company and the Underwriters agree that it would not be just or equitable if contribution pursuant to this Section 8 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 8(d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in Section 8(d) shall be deemed to include, subject to the limitations set forth

25

above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(f) The indemnity and contribution provisions contained in this Section 8 and the representations, warranties and other statements of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter, any person controlling any Underwriter or any affiliate of any Underwriter or by or on behalf of the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Shares.

9. Directed Share Program Indemnification. (a) The Company agrees to indemnify and hold harmless Morgan Stanley, each person, if any, who controls Morgan Stanley within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of Morgan Stanley within the meaning of Rule 405 of the Securities Act (“ Morgan Stanley Entities ”) from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) (i) caused by any untrue statement or alleged untrue statement of a material fact contained in any material prepared by or with the consent of the Company for distribution to Participants in connection with the Directed Share Program or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading; (ii) caused by the failure of any Participant to pay for and accept delivery of Directed Shares that the Participant agreed to purchase; or (iii) related to, arising out of, or in connection with the Directed Share Program, other than losses, claims, damages or liabilities (or expenses relating thereto) that are finally judicially determined to have resulted from the bad faith or gross negligence of Morgan Stanley Entities.

(b) In case any proceeding (including any governmental investigation) shall be instituted involving any Morgan Stanley Entity in respect of which indemnity may be sought pursuant to Section 9(a), the Morgan Stanley Entity seeking indemnity, shall promptly notify the Company in writing and the Company, upon request of the Morgan Stanley Entity, shall retain counsel reasonably satisfactory to the Morgan Stanley Entity to represent the Morgan

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Stanley Entity and any others the Company may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any Morgan Stanley Entity shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Morgan Stanley Entity unless (i) the Company shall have agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the Company and the Morgan Stanley Entity and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. The Company shall not, in respect of the legal expenses of the Morgan Stanley Entities in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all Morgan Stanley Entities. Any such separate firm for the Morgan Stanley Entities shall be designated in writing by Morgan Stanley. The Company shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the Company agrees to indemnify the Morgan Stanley Entities from and against any loss or liability by reason of such settlement or judgment. The Company shall not, without the prior written consent of Morgan Stanley, effect any settlement of any pending or threatened proceeding in respect of which any Morgan Stanley Entity is or could have been a party and indemnity could have been sought hereunder by such Morgan Stanley Entity, unless such settlement includes an unconditional release of the Morgan Stanley Entities from all liability on claims that are the subject matter of such proceeding.

(c) To the extent the indemnification provided for in Section 9(a) is unavailable to a Morgan Stanley Entity or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then the Company in lieu of indemnifying the Morgan Stanley Entity thereunder, shall contribute to the amount paid or payable by the Morgan Stanley Entity as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Morgan Stanley Entities on the other hand from the offering of the Directed Shares or (ii) if the allocation provided by clause 9(c)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 9(c)(i) above but also the relative fault of the Company on the one hand and of the Morgan Stanley Entities on the other hand in connection with any statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Morgan Stanley Entities on the other hand in connection with the offering of the Directed Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Directed Shares (before deducting expenses) and the total underwriting discounts and commissions received by the Morgan Stanley Entities for the Directed Shares, bear to the aggregate Public Offering Price of the Directed Shares. If the loss, claim, damage or liability is caused by an untrue or alleged untrue statement of a material fact or the omission or alleged omission to

27

state a material fact, the relative fault of the Company on the one hand and the Morgan Stanley Entities on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement or the omission or alleged omission relates to information supplied by the Company or by the Morgan Stanley Entities and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

(d) The Company and the Morgan Stanley Entities agree that it would not be just or equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Morgan Stanley Entities were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 9(c). The amount paid or payable by the Morgan Stanley Entities as a result of the losses, claims, damages and liabilities referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by the Morgan Stanley Entities in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 9, no Morgan Stanley Entity shall be required to contribute any amount in excess of the amount by which the total price at which the Directed Shares distributed to the public were offered to the public exceeds the amount of any damages that such Morgan Stanley Entity has otherwise been required to pay. The remedies provided for in this Section 9 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(e) The indemnity and contribution provisions contained in this Section 9 shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Morgan Stanley Entity or the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Directed Shares.

10. Termination . The Underwriters may terminate this Agreement by notice given by you to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, either of The New York Stock Exchange or the NASDAQ Global Market, (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets or any calamity or crisis that, in your judgment, is material and adverse and which, singly or together with any other event specified in this clause (v), makes it, in your judgment, impracticable or inadvisable to proceed with the offer, sale or delivery of the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

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11. Effectiveness; Defaulting Underwriters . This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

If, on the Closing Date or an Option Closing Date, as the case may be, any one or more of the Underwriters shall fail or refuse to purchase Shares that it has or they have agreed to purchase hereunder on such date, and the aggregate number of Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of the Shares to be purchased on such date, the other Underwriters shall be obligated severally in the proportions that the number of Firm Shares set forth opposite their respective names in Schedule I bears to the aggregate number of Firm Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as you may specify, to purchase the Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the number of Shares that any Underwriter has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 11 by an amount in excess of one-ninth of such number of Shares without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Firm Shares and the aggregate number of Firm Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Firm Shares to be purchased on such date, and arrangements satisfactory to you and the Company for the purchase of such Firm Shares are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case either you or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement, in the Time of Sale Prospectus, in the Prospectus or in any other documents or arrangements may be effected. If, on an Option Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Additional Shares and the aggregate number of Additional Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Additional Shares to be purchased on such Option Closing Date, the non-defaulting Underwriters shall have the option to (i) terminate their obligation hereunder to purchase the Additional Shares to be sold on such Option Closing Date or (ii) purchase not less than the number of Additional Shares that such non-defaulting Underwriters would have been obligated to purchase in the absence of such default. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, the Company will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the reasonably incurred and documented fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the offering contemplated hereunder.

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12. Entire Agreement . (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the offering of the Shares, represents the entire agreement between the Company and the Underwriters with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the offering, and the purchase and sale of the Shares.

(b) The Company acknowledges that in connection with the offering of the Shares: (i) the Underwriters have acted at arms-length, are not agents of, and owe no fiduciary duties to, the Company or any other person, (ii) the Underwriters owe the Company only those duties and obligations set forth in this Agreement and prior written agreements (to the extent not superseded by this Agreement), if any, and (iii) the Underwriters may have interests that differ from those of the Company. The Company waives to the full extent permitted by applicable law any claims it may have against the Underwriters arising from an alleged breach of fiduciary duty in connection with the offering of the Shares.

13. Counterparts . This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

14. Waiver of Jury Trial . The Company and each of the Underwriters hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

15. Applicable Law . This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York. The Company agrees that any suit or proceeding arising in respect of this Agreement or any transaction contemplated by this Agreement will be tried exclusively in the U.S. District Court for the Southern District of New York or, if that court does not have subject matter jurisdiction, in any state court located in The City and County of New York and the Company agrees to submit to the jurisdiction of, and to venue in, such courts.

16. Headings . The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

17. Notices . All communications hereunder shall be in writing and effective only upon receipt and if to the Underwriters shall be delivered, mailed or sent to you at in care of Morgan Stanley & Co. LLC, 1585 Broadway, New York, New York 10036, Attention: Equity Syndicate Desk, with a copy to the Legal Department; in care of Goldman Sachs & Co. LLC, 200 West Street, New York, New York 10282, Attention: Control Room; Barclays Capital Inc., 745 Seventh Avenue, New York, New York 10019, Attention: Syndicate Registration (Fax: (646) 834-8133), with a copy, in the case of any notice pursuant to Section 8, to the Director of Litigation, Office of the General Counsel, Barclays Capital Inc., 745 Seventh Avenue, New York, New York 10019; Deutsche Bank

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Securities Inc., 60 Wall Street, 2nd Floor, New York, New York 10005, Attention: Equity Capital Markets – Syndicate Desk, with a copy to Deutsche Bank Securities Inc., 60 Wall Street, 36th Floor, New York, New York 10005, Attention: General Counsel, fax: (646) 374-1071 and if to the Company shall be delivered, mailed or sent to ADT, Inc., 1501 Yamato Road, Boca Raton, FL 33431, Attention: General Counsel.

[ Signature pages follow ]

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[Signature Page to Underwriting Agreement]

[Signature Page to Underwriting Agreement]

[Signature Page to Underwriting Agreement]

SCHEDULE I

I-1

SCHEDULE II

Time of Sale Prospectus

II-1

SCHEDULE III

The following persons shall execute a lock-up agreement in the form set forth on Exhibit A hereto:

Prime Security Services TopCo Parent, LP

Timothy J. Whall

James D. DeVries

Daniel M. Bresingham

P. Gray Finney

Jeffrey Likosar

Jamie E. Haenggi

Donald Young

Jay Darfler

Robert M. Dale

Zachary Susil

Amelia O. Pulliam

Andrew D. Africk

Marc E. Becker

Matthew H. Nord

Reed B. Rayman

Eric L. Press

Lee J. Solomon

Stephanie Drescher

Brett Watson

David Ryan

III-1

SCHEDULE IV

The following subsidiaries shall be considered Significant Subsidiaries for the purposes of this Agreement:

ADT Canada Holdings, Inc.

ADT Holdings, Inc.

ADT LLC

ADT US Holdings, Inc.

Prime Security Services Borrower, LLC

Prime Security Services Holdings, LLC

The ADT Security Corporation

IV-1

ANNEX A

FORM OF OPINION OF PAUL, WEISS, RIFKIND, WHARTON & GARRISON LLP

****

A-1

EXHIBIT A

FORM OF LOCK-UP LETTER

                      , 2018

Morgan Stanley & Co. LLC

Goldman Sachs & Co. LLC

Barclays Capital Inc.

Deutsche Bank Securities Inc.

RBC Capital Markets, LLC

1585 Broadway

New York, NY 10036

200 West Street

New York, New York 10282

745 Seventh Avenue

New York, New York 10019

60 Wall Street

New York, NY 10005

200 Vesey Street

New York, New York 10281

Ladies and Gentlemen:

The undersigned understands that you, as representatives (collectively, the “ Representatives ”), propose to enter into an Underwriting Agreement (the “ Underwriting Agreement ”) with ADT Inc., a Delaware corporation (the “ Company ”), providing for the public offering (the “ Public Offering ”) by the several Underwriters, including the Representatives (the “ Underwriters ”), of shares (the “ Shares ”) of the Common Stock, par value $0.01 per share of the Company (the “ Common Stock ”).

To induce the Underwriters that may participate in the Public Offering to continue their efforts in connection with the Public Offering, the undersigned hereby agrees that, without both (i) the prior written consent of Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC on behalf of the Underwriters and (ii) the prior written notice to the other Representatives

A-2

(collectively, the “ Release Conditions ”), the undersigned will not, during the period commencing on the date hereof and ending 180 days after the date of the final prospectus (the “ Restricted Period ”) relating to the Public Offering (the “ Prospectus ”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock beneficially owned (as such term is used in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”)), by the undersigned or any other securities so owned convertible into or exercisable or exchangeable for Common Stock, (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (3) make any demand for or exercise any right with respect to the registration of any shares of Common Stock or securities convertible, exercisable or exchangeable into Common Stock other than any demand for or exercise of rights with respect to any confidential or non-public submission for registration of any shares of Common Stock or securities convertible, exercisable or exchangeable into Common Stock ( provided that, in the case of any such confidential or non-public submission, (a) the undersigned or the Company shall give Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC written notice at least two business days prior to such submission, (b) no public announcement of such demand or exercise of rights shall be made, (c) no public announcement of such confidential or non-public submission shall be made and (d) no such confidential or non-public submission shall become a publicly available registration statement during the Restricted Period).

The foregoing sentence shall not apply to:

(a) transactions relating to shares of Common Stock or other securities acquired in open market transactions after the completion of the Public Offering, provided that no filing under Section 16(a) of the Exchange Act or any other public filing or disclosure by or on behalf of the undersigned shall be required or shall be voluntarily made in connection with subsequent sales of Common Stock or other securities acquired in such open market transactions (other than a filing on Form 5 made after the expiration of the Restricted Period referred to above) in connection with such transfer or distribution;

(b) transfers of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock (i) as a bona fide gift or charitable contribution in a transaction exempt under Section 16(b) of the Exchange Act, (ii) to an immediate family member or a trust for the direct or indirect benefit of the undersigned or such immediate family member of the undersigned, (iii) by will or intestacy, (iv) to a partnership, limited liability company or other entity of which the undersigned and the immediate family of the undersigned are the legal and beneficial owner of all of the outstanding equity securities or similar interests, (v) to a nominee or custodian of a person or entity to whom a disposition or transfer would be permissible under clauses (i) through (iv) above, (vi) pursuant to an order of a court or regulatory agency, (vii) by a stockholder that is a trust to a trustor or beneficiary of the trust or to the estate of a beneficiary of such trust, or (viii) from an executive officer to the Company or its parent entities upon death, disability or termination of employment, in each case of such executive officer; provided that (x) each donee, transferee or trustee of the trust (in the case of a transfer to a trust) shall sign and deliver a lock-up agreement substantially in the form of this lock-up agreement and (y) such transfer shall not be a disposition for value;

A-3

(c) if the undersigned is a corporation, partnership or limited liability company, (i) distributions of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock to partners, limited liability company members, stockholders or holders of similar interests of the undersigned (or in each case its nominee or custodian) or (ii) transfers of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock to affiliates (as defined in Rule 405 of the Securities Act of 1933, as amended); provided that (x) each distributee and transferee shall sign and deliver a lock-up agreement substantially in the form of this agreement and (y) such distribution or transfer shall not be a disposition for value;

(d) transfers of shares of Common Stock or any security convertible, exercisable or exchangeable into Common Stock by operation of law pursuant to a qualified domestic order or in connection with a divorce settlement; provided that any filing required by Section 16 of the Exchange Act shall indicate in the footnotes thereto that such transfer is being made pursuant to circumstances described in this clause (d) and such shares of Common Stock remain subject to this lock-up agreement, provided , further , that no other public announcement or filing shall be required or shall be voluntarily made during the Restricted Period;

(e) (i) the exercise of stock options solely with cash granted pursuant to equity incentive plans of the Company and its subsidiaries described in the Prospectus, and the receipt by the undersigned from the Company of shares of Common Stock upon such exercise, and (ii) purchase of restricted stock and the receipt of shares of Common Stock upon the vesting during the Restricted Period of restricted stock granted pursuant to equity incentive plans of the Company and its subsidiaries or pursuant to other stock purchase arrangements, in each case described in the Prospectus; provided that the underlying shares of Common Stock shall continue to be subject to the restrictions on transfer set forth in this lock-up agreement; provided , further , that, if required, any public report or filing under Section 16 of the Exchange Act shall indicate in the footnotes thereto that the filing relates to the exercise of a stock option or receipt of restricted stock or shares of Common Stock upon vesting of restricted stock and that no shares were sold by the reporting person;

(f) transfers of shares of Common Stock to the Company upon the “net” or “cashless” exercise of stock options or other equity awards granted pursuant to equity incentive plans of the Company and its subsidiaries described in the Prospectus, provided that the underlying shares of Common Stock issued to the undersigned upon such exercise shall continue to be subject to this lock-up agreement; provided , further , if required, any public report or filing under Section 16 of the Exchange Act shall indicate in the footnotes thereto that the filing relates to the “net” or “cashless” exercise of options to purchase shares of Common Stock for the purpose of exercising such options, including, if applicable, the payment of taxes due as a result of such exercise;

(g) forfeitures of shares of Common Stock to the Company to satisfy tax withholding requirements of the undersigned or the Company upon the vesting, during the Restricted Period, of equity based awards granted under an equity incentive plan or pursuant to other stock purchase arrangements, in each case described in the Prospectus; provided that, if required, any public report or filing under Section 16 of the Exchange Act shall indicate in the footnotes thereto that the filing relates to the satisfaction of tax withholding requirements in connection with the vesting of such equity-based awards or restricted stock;

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(h) transfer of shares of Common Stock pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction made to all holders of the Company’s capital stock after the consummation of the Public Offering, involving a change of control of the Company, provided that in the event that such tender offer, merger, consolidation or other such transaction is not completed, the undersigned’s shares of Common Stock shall remain subject to the provisions of this lock-up agreement;

(i) the establishment of a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Common Stock; provided that (i) such plan does not provide for the transfer of Common Stock during the Restricted Period and (ii) to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by or on behalf of the undersigned or the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of Common Stock may be made under such plan during the Restricted Period; and

(j) transfers to the Company of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock in connection with the repurchase by the Company from the undersigned of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock pursuant to a repurchase right arising upon the termination of the undersigned’s employment with the Company; provided that such repurchase right is pursuant to contractual agreements with the Company; provided , further , that, if required, any public announcement or filing under Section 16 of the Exchange Act shall indicate in the footnotes thereto that the filing related to a transfer made pursuant to the circumstances described in this clause (j); provided , further , that no other public announcement or filing shall be required or shall be voluntarily made during the Restricted Period; ¹

(k) transfers to the undersigned’s employer or any affiliate of the undersigned’s employer (“ Employer ”) of shares of Common Stock or any security convertible, exchangeable or exercisable into Common Stock which the undersigned received as compensation in his capacity as a member of the Company’s board of directors as described in the Prospectus; provided that (i) such transfer is pursuant to the terms of an employment arrangement of the undersigned with the Employer, (ii) the Employer shall sign and deliver a lock-up agreement substantially in the form of this lock-up agreement in respect of such shares of Common Stock or such other securities transferred to the Employer pursuant to this clause (k), and (iii) if required, any public announcement or filing under Section 16 of the Exchange Act shall indicate in the footnotes thereto that the filing related to a transfer made pursuant to the circumstances described in this clause (k) and no other public announcement or filing shall be required or shall be voluntarily made during the Restricted Period;

A-5

provided further that in the case of any transfer or distribution pursuant to clause (b) or (c), no filing under Section 16(a) of the Exchange Act or any other public filing or disclosure by or on behalf of the undersigned, reporting a reduction in beneficial ownership of shares of Common Stock, shall be required or shall be voluntarily made during the Restricted Period in connection with such transfer or distribution. For purposes of this lock-up agreement, “change of control” shall mean any bona fide third party tender offer, merger, consolidation or other similar transaction approved by the board of directors of the Company the result of which is that any “person” (as defined in Section 13(d)(3) of the Exchange Act), or group of persons, other than the Company, shall become, after the closing of the transaction, the beneficial owner (as defined in Rules 13d-3 and 13d-5 of the Exchange Act) of more than 50% of total voting power of the voting stock of the Company. The undersigned agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the undersigned’s shares of Common Stock except in compliance with the foregoing restrictions.

If the undersigned is an officer or director of the Company, the undersigned further agrees that the foregoing provisions shall be equally applicable to any issuer-directed Shares the undersigned may purchase in the offering.

If the undersigned is an officer or director of the Company, (i) the Representatives agree that, at least three business days before the effective date of any release or waiver of the foregoing restrictions in connection with a transfer of shares of Common Stock, the Representatives will notify the Company of the impending release or waiver, and (ii) the Company has agreed in the Underwriting Agreement to announce the impending release or waiver by press release through a major news service at least two business days before the effective date of the release or waiver. Any release or waiver granted in accordance with the Release Conditions hereunder to any such officer or director shall only be effective two business days after the publication date of such press release. The provisions of this paragraph will not apply if (a) the release or waiver is effected solely to permit a transfer not for consideration and (b) the transferee has agreed in writing to be bound by the same terms described in this lock-up agreement to the extent and for the duration that such terms remain in effect at the time of the transfer.

The undersigned understands that the Company and the Underwriters are relying upon this lock-up agreement in proceeding toward consummation of the Public Offering. The undersigned further understands that this lock-up agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors and assigns.

As of the date hereof, this lock-up agreement only applies to the undersigned and does not apply to any affiliated fund of the undersigned that have not separately signed a lock-up agreement with the Underwriters, provided that any affiliated funds may be required to enter into such lock-up agreements in compliance with the terms of this lock-up agreement.

Whether or not the Public Offering actually occurs depends on a number of factors, including market conditions. Any Public Offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and the Underwriters.

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This lock-up agreement will automatically terminate upon the earliest to occur, if any, of (a) the date that the Company advises the Representatives, in writing, prior to the execution of the Underwriting Agreement, that it has determined not to proceed with the Public Offering, (b) the date of termination of the Underwriting Agreement if prior to the closing of the Public Offering, or (c) March 31, 2018 if the Public Offering of the Shares has not been completed by such date.

[ Signature page follows ]

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IN WITNESS WHEREOF, the undersigned has executed this lock-up agreement on the date first written above.

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EXHIBIT B

FORM OF WAIVER OF LOCK-UP

                     , 20     

[Name and Address of

Officer or Director

Requesting Waiver]

Dear Mr./Ms. [Name]:

This letter is being delivered to you in connection with the offering by ADT Inc. (the “ Company ”) of          shares of common stock, par value $0.01 per share (the “ Common Stock ”), of the Company and the lock-up letter dated         , 20     (the “ Lock-up Letter ”), executed by you in connection with such offering, and your request for a [waiver] [release] dated         , 20    , with respect to                     shares of Common Stock (the “ Shares ”).

[•] hereby agree to [waive] [release] the transfer restrictions set forth in the Lock-up Letter, but only with respect to the Shares, effective         , 20    ; provided, however, that such [waiver] [release] is conditioned on the Company announcing the impending [waiver] [release] by press release through a major news service at least two business days before effectiveness of such [waiver] [release]. This letter will serve as notice to the Company of the impending [waiver] [release].

Except as expressly [waived] [released] hereby, the Lock-up Letter shall remain in full force and effect.

cc: Company

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FORM OF PRESS RELEASE

ADT Inc.

[Date]

ADT Inc. (the “ Company ”) announced today that [•], on behalf of the underwriters in the Company’s recent public sale of         shares of common stock, are [waiving][releasing] a lock-up restriction with respect to          shares of the Company’s common stock held by [certain officers or directors] [an officer or director] of the Company. The [waiver][release] will take effect on         , 20     , and the shares may be sold on or after such date.

This press release is not an offer for sale of the securities in the United States or in any other jurisdiction where such offer is prohibited, and such securities may not be offered or sold in the United States absent registration or an exemption from registration under the United States Securities Act of 1933, as amended.

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