---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-077995"
form_type: "8-K"
ticker: "ADTN"
cik: "0000926282"
company_name: "ADTRAN Holdings, Inc."
filed_at: "2025-05-28T23:59:59+00:00"
generated_at: "2026-05-20T09:53:02.170848+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "low"
source: SEC EDGAR
---

# ADTRAN Holdings restates 2024 and 2023 financials; updates Q1 2025 non-GAAP measures

## Summary
- Restated consolidated financial statements for fiscal years 2024 and 2023 and interim periods in 2024.
- Filed Q1 2025 Form 10-Q on May 20, providing final Q1 2025 financials.
- Updated non-GAAP measures and investor presentation attached as exhibits to this 8-K.
- Supersedes preliminary financial information from May 7, 2025 press release.

## SEC filing metadata
- accession: 0000950170-25-077995
- form_type: 8-K
- ticker: ADTN
- cik: 0000926282
- company_name: ADTRAN Holdings, Inc.
- filed_at: 2025-05-28T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: low
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/926282/000095017025077995/0000950170-25-077995-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/926282/000095017025077995/adtn-20250527.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-077995
- JSON: https://secwatch.observer/filing/0000950170-25-077995.json
- Plain text: https://secwatch.observer/filing/0000950170-25-077995.txt

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