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): July 6, 2012

ABM Industries Incorporated

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 297-0200

N/A

(Former name or former address, if changed since last report)

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

Item 7.01. Regulation FD Disclosure

The Company is a defendant in the previously reported consolidated cases of Augustus, Hall and Davis v. American Commercial Security Services filed on July 12, 2005 in the Superior Court of California, Los Angeles County (the “Augustus case”). The Augustus case is a class action involving allegations that the Company violated certain state laws relating to meal and rest breaks. As previously disclosed, the plaintiffs filed a motion for summary judgment on the rest break claim seeking damages in the amount of $103.0 million. On July 6, 2012, the Superior Court of California, Los Angeles County (the “Superior Court”) heard plaintiffs’ motion for damages on the rest break claim and the Company’s motion to decertify the class. The Superior Court denied the Company’s motion and awarded plaintiffs damages. The Company anticipates that the amount of the award will be in excess of $89 million. This amount does not include plaintiffs’ counsel’s fees. The Company strongly disagrees with the decisions of the Superior Court, firmly believes that it has complied with applicable law, and intends to vigorously appeal these decisions.

SIGNATURES

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