On May 13, 2025, ADTRAN Holdings, Inc. revealed it has identified a €5.7 million adjustment to inventory that affects its financial statements for 2024 and 2023, leading to the need for restatements and postponement of its 2025 annual meeting originally scheduled for May 14, 2025. The company has acknowledged material weaknesses in its financial reporting controls and will file for an extension to submit its quarterly report by May 19, 2025.