---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-070473"
form_type: "8-K"
ticker: "ADTN"
cik: "0000926282"
company_name: "ADTRAN Holdings, Inc."
filed_at: "2025-05-13T23:59:59+00:00"
generated_at: "2026-05-21T22:36:04.594080+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# ADTRAN Holdings restates FY23/FY24 results; €5.7M inventory error; annual meeting postponed

## Summary
- Audit Committee concludes 2023 and 2024 annual and interim financials should no longer be relied upon due to inventory adjustment.
- Subsidiary Adtran Networks SE's €5.7M increase in cost of goods sold was not properly communicated before filing.
- At least one additional material weakness identified in internal controls; PwC opinions on prior periods withdrawn.
- Annual meeting postponed from May 14, 2025 pending restatement; Form 12b-25 to be filed for Q1 10-Q extension.

## SEC filing metadata
- accession: 0000950170-25-070473
- form_type: 8-K
- ticker: ADTN
- cik: 0000926282
- company_name: ADTRAN Holdings, Inc.
- filed_at: 2025-05-13T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 4.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/926282/000095017025070473/0000950170-25-070473-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/926282/000095017025070473/adtn-20250513.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-070473
- JSON: https://secwatch.observer/filing/0000950170-25-070473.json
- Plain text: https://secwatch.observer/filing/0000950170-25-070473.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.