ABM INDUSTRIES INC DE

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

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February 15, 2024 Dear Stockholders:On behalf of the ABM Industries Incorporated Board of Directors, I am very pleased to report that ABM successfully navigated through choppy macroeconomic conditions and delivered solid financial results in 2023, while also advancing several strategic initiatives related to our ELEVATE strategy. I also wanted to take the opportunity to thank you for your continued interest, ownership, and support of the Company.The Board is once again delighted to use this letter to communicate our assessment of ABM’s overall performance during the past year, which was quite notable given the commercial real estate challenges and labor-related headwinds the Company faced all year.Strategy Oversight and Board FocusThroughout 2023, the Board focused on ensuring that the management team understood the risks and opportunities related to the weak commercial real estate market and was prepared to respond accordingly. The Board supported management’s plan, including the Company’s continued execution across its diversified service and client mix. The Company’s flexible labor model also helped ABM successfully manage through the unsettled market. The Board continued to oversee the management team’s technology and growth-focused operational enhancement efforts, as well as advised on the Company’s capital allocation priorities to drive long-term stockholder value. The Board’s commitment to responsible corporate governance is unwavering, as are our priorities of judicious risk management, effective executive compensation practices and leadership talent retention. We are also pleased that ABM has a consistent and forward-looking focus on socially responsible initiatives and practices, including workforce management and communications, diversity and inclusion, all of which we believe are critical drivers of ABM’s long-term success.Fiscal Year 2023 Financial PerformanceDuring 2023, the Company grew revenue 3.7% to $8.1 billion, through a mix of solid organic growth and growth from acquisitions. Organic growth largely reflected strong markets served by our Aviation segment and steady demand in our Education and Manufacturing & Distributions markets, coupled with several large new customer wins across the organization. Our increase in net income was aided by higher segment earnings and the benefits of cost controls and price increases, which helped to partially offset inflationary pressures.The Company also significantly grew adjusted EBITDA and free cash flow in 2023, which enabled ABM to continue to invest in its business while also repurchasing roughly 5% of the total number of outstanding shares and raising its annual dividend for the 56th consecutive year.Investing in Future Growth and ELEVATE ProgressABM made significant progress on its ELEVATE initiatives in 2023, including the successful financial close utilizing its new cloud-based enterprise resource planning system for the Education segment. The Company also began the phased launch of its new employee mobile application called Team Connect, which is designed to deliver on-demand training, safety reminders, and task

management features among other capabilities. The Company plans to further build out and scale these capabilities across other parts of the organization in 2024.Summary2023 was a strong test for the Company and provided further proof that ABM has the right market positioning, long-term strategy, and management team to deliver consistent and sustainable performance, even in challenging conditions. Our asset-light business model, coupled with our ability to generate cash, provides multiple opportunities to grow our business while also returning capital to stockholders on a regular basis. The Board is pleased with the trajectory of the Company and will stay focused on raising the standard in everything we do, as well as being a driving force of a cleaner, healthier and more sustainable world.

Thank you for your continued support.

Sincerely,

Sudhakar KesavanChairman of the Board

ITEMS OF BUSINESS

Election of the ten director nominees named in the proxy statement.

Advisory approval of our executive compensation.

Ratification of the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending October 31, 2024.

Transaction of such other business as may properly come before the Annual Meeting.

RECORD DATE

Stockholders of record at the close of business on January 29, 2024 are entitled to notice of, and to vote at the Annual Meeting.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE 2024 ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON MARCH 27, 2024: The Notice of Annual Meeting, Proxy Statement and the Annual Report to Stockholders are available on the Internet at www.proxyvote.com.

Whether or not you plan to attend the Annual Meeting, please vote at your earliest convenience by following the instructions in the Notice of Internet Availability of Proxy Materials or the proxy card or voting instruction card you received in the mail.

By Order of the Board of Directors,

Andrea R. Newborn

Executive Vice President, General Counsel

and Corporate Secretary

TABLE OF CONTENTS

Note About Forward-Looking Statements

This Proxy Statement contains both historical and forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, that involve risks and uncertainties. We make forward-looking statements related to future expectations, estimates, and projections that are uncertain and often contain words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “intend,” “likely,” “may,” “outlook,” “plan,” “predict,” “should,” “target,” or other similar words or phrases. These statements are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and assumptions that are difficult to predict. Factors that might cause such differences include, but are not limited to, those discussed in Part 1 of ABM’s Annual Report on Form 10-K for the fiscal year ended October 31, 2023 under Item 1A., “Risk Factors,” and we urge readers to consider these risks and uncertainties in evaluating our forward-looking statements. We caution readers not to place undue reliance upon any such forward-looking statements, which speak only as of the date made. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.