IES Holdings, Inc.

Changes in Internal Control Over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15 and 15d-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) during the fiscal quarter to which this report relates that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting. We are in the process of implementing a new enterprise resource planning (“ERP”) system, which will replace and upgrade many of our existing financial systems and processes. The ERP system is designed to accurately maintain our financial records and provide timely information to management to be used in operating the business. The first phase was implemented in the quarter ended December 31, 2024 and the Company continued working toward the next phase of the implementation through the quarter ended June 30, 2026. This next phase was implemented in July 2026. As the implementation activities progress, we will continue to monitor the impact of the implementation on our financial reporting business processes and evaluate each quarter whether there are changes that affect our internal control over financial reporting.

Disclosure Controls and Procedures

In accordance with Rules 13a-15 and 15d-15 of the Exchange Act, we carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of June 30, 2026, to provide reasonable assurance that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. Our disclosure controls and procedures include controls and procedures designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.