Exhibit 99.1 News Release JLL Reports Financial Results for First-Quarter 2024 Diluted earnings per share were $1.37, up from a loss of$0.19 last year; adjusted diluted earnings per share1 were $1.78, up from$0.71 CHICAGO, May 6, 2024 – Jones Lang LaSalle Incorporated (NYSE: JLL) today reported operating performance for the first quarter of 2024. Modestly higher Transactional revenues, following a softer 2023, complemented continued Resilient business line revenue growth and the benefits of cost mitigatio ...