UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant To Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 18, 2012

The ADT Corporation

(Exact name of registrant as specified in its charter)

Delaware |  | 001-35502 |  | 45-4517261
(Jurisdiction of Incorporation) |  | (Commission File Number) |  | (IRS Employer Identification Number)

1501 Yamato Road

Boca Raton, Florida 33431

(Address of Principal Executive Offices, including Zip Code)

(561) 988-3600

(Registrant’s telephone number, including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

| ¨ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

| ¨ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

| ¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

| ¨ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01 Regulation FD Disclosure

The following information is furnished pursuant to Item 7.01 Regulation FD Disclosure. This information shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Executives from The ADT Corporation (the “Company”) will present an overview of the Company and information related to the Company’s separation from Tyco International Ltd. during investor presentations beginning on September 18, 2012. A copy of the presentation is attached as Exhibit 99.1 and incorporated by reference herein.

Item 9.01. Financial Statements and Exhibits.

Exhibit No. |  | Description
99.1 |  | Presentation slides issued by The ADT Corporation on September 18, 2012.

SIGNATURES

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

Date: September 18, 2012 |  |  |  | THE ADT CORPORATION
|  |  |  | By: |  | /s/ N. David Bleisch
|  |  |  | Name: |  | N. David Bleisch
|  |  |  | Title: |  | Senior Vice President, General Counsel and Corporate Secretary