---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-020613"
form_type: "8-K"
ticker: "ADTN"
cik: "0000926282"
company_name: "ADTRAN Holdings, Inc."
filed_at: "2024-02-27T23:59:59+00:00"
generated_at: "2026-06-05T14:02:05.122381+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Adtran Q4 prelim: GAAP net loss $109.9M, non-GAAP EPS -$1.09

## Summary
- Preliminary Q4 revenue $225.5M; non-GAAP operating margin -1.4% (upper end of -7% to 0% guidance).
- GAAP gross margin 34.8% (+483 bps YoY); non-GAAP gross margin 41.9% (+277 bps YoY).
- GAAP operating expenses down 7.6% sequentially; non-GAAP operating expenses down 15.1% sequentially.
- Preliminary diluted loss per share: GAAP -$1.40, non-GAAP -$1.09; inventory write-off $3.3M vs $21M in Q3.
- Management cites macro headwinds and elevated customer inventories; sees unchanged fiber demand landscape.

## SEC filing metadata
- accession: 0000950170-24-020613
- form_type: 8-K
- ticker: ADTN
- cik: 0000926282
- company_name: ADTRAN Holdings, Inc.
- filed_at: 2024-02-27T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/926282/000095017024020613/0000950170-24-020613-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/926282/000095017024020613/adtn-20240226.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-020613
- JSON: https://secwatch.observer/filing/0000950170-24-020613.json
- Plain text: https://secwatch.observer/filing/0000950170-24-020613.txt

## Key facts
- Earnings Releases
  ADTRAN Holdings, Inc. reported the fourth quarter of 2023 results: revenue $225.5 million.
  - Period: the fourth quarter of 2023
  - Revenue: $225.5 million
  - Result: preliminary results
  source text: ADTRAN Holdings, Inc. reports preliminary fourth quarter 2023 financial results • Preliminary Q4 revenue at $225.5 million and at mid-point of guidance
  evidence_url: https://www.sec.gov/Archives/edgar/data/926282/000095017024020613/0000950170-24-020613-index.htm

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