FOR IMMEDIATE RELEASE EXHIBIT 99.1 IES Holdings Reports Fiscal 2024 Second Quarter Results HOUSTON — May 3, 2024 — IES Holdings, Inc. (or “IES” or the “Company”) (NASDAQ: IESC) today announced financial results for the quarter ended March 31, 2024. Second Quarter 2024 Highlights and Recent Developments • Revenue of $706 million for the second quarter of fiscal 2024, an increase of 24% compared with $569 million for the same quarter of fiscal 2023 • Operating income of $77.7 million for the second quarter of ...