IES Holdings, Inc.

Changes in Internal Control Over Financial Reporting

There have not been any changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15 and 15d-15 under the Exchange Act) during the fiscal quarter ended September 30, 2025 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting. In the fiscal year ended September 30, 2024, we began planning and preparing for our phased implementation of 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 throughout the remainder of fiscal 2025. Upon the first phase implementation, the Company updated its internal controls as appropriate. As the implementation activities take place, 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 under 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 this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of September 30, 2025, 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 SEC’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.

Management’s Report on Internal Control over Financial Reporting

Management, including the Company’s Chief Executive Officer and Chief Financial Officer, is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. The Company’s internal control system was designed to provide reasonable assurance to the Company’s Management and Directors regarding the preparation and fair presentation of published financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management conducted an evaluation of the effectiveness of internal control over financial reporting based on the Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO 2013 framework). Based on this assessment, our management determined that our disclosure controls and procedures were effective as of September 30, 2025.

Ernst & Young LLP (PCAOB No. 42), an independent registered public accounting firm that has audited the Company’s financial statements as of and for the three-year period ended September 30,2025, has issued a report on their audit of management’s internal control over financial reporting, which is included herein.