Exhibit 99.1 ABM REPORTS FIRST QUARTER FISCAL 2024 RESULTS AND RAISES OUTLOOK FOR FISCAL YEAR 2024 ADJUSTED EPS • Revenue up 3.9% to 2.1billion,allorganicgrowth•Netincomeof44.7 million and GAAP EPS of 0.70,up164.4 million, or 0.07pershare•AdjustedEBITDAof116.7 million, down 5% • Adjusted EPS of 0.86,up93.30 to 3.45,upfrom3.20 to $3.40 (1) NEW YORK, NY - ...