This report was submitted to the Comptroller General in accordance with Section 5 of the Government Accountability Office (GAO) Act of 2008. The report summarizes the activities of GAO's Office of Inspector General (OIG) for the 6-month reporting period ending September 30, 2025. During this reporting period, the OIG closed 17 GAO related investigations, opened 13 new GAO related investigations, and processed 58 substantive hotline complaints. We also continued one performance audit and initiated three performance audits and one evaluation. The OIG also issued a Strategic Plan for Fiscal Years 2026–2030 illustrating its unwavering commitment to providing impactful oversight. A culture of continuous improvement will aid in strengthening the workforce and protecting independence, ensuring the OIG's work is free from external influence. For more information, contact the OIG at oig@gao.gov.