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ADTRAN Holdings, Inc. (ADTN): material weakness open 1,398 days

By Russell Tomoum, Ctrl Worx™. Built from its own SEC filings. How the Clock works.

ADTRAN Holdings, Inc. reported ineffective internal control over financial reporting because of a material weakness in 6 filings since Aug 14, 2023. It stated one or more material weaknesses in 13 more SEC filings that gave no conclusion on whether that control is effective. The latest was its 10-Q for the period ended Jun 30, 2026.

Checked against SEC EDGAR: Oct 29, 2026 · Entry #10224

Causes the company named

Financial close and reporting · 19Entity-level and governance · 15Complex or non-routine accounting · 12Inventory · 4Not described · 1

What the latest filing says

Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that due to the material weaknesses in our internal control over financial reporting described below, our disclosure controls and procedures were not effective as of June 30, 2026. Material Weaknesses in Internal Control over Financial Reporting A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. In its assessment of the effectiveness of internal control over financial reporting as of June 30, 2026, management determined that there were deficiencies in Adtran’s internal control over financial reporting that constituted material weaknesses that existed as of June 30, 2026. Such material weaknesses were as follows: •Adtran did not design and maintain effective controls in response to the risks of material misstatement. Specifically, changes to existing contro [...]

From the controls section of the 10-Q filed Aug 4, 2026. Read the full filing on SEC EDGAR.

Company response: ADTRAN Holdings, Inc. can send a statement or a link to its remediation update to russell@ctrlworx.com. We post it here, unedited and dated.

Filings

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Based on public SEC filings. Causes are grouped into standard categories by Ctrl Worx. The filings are the authority. Ctrl Worx is not affiliated with ADTRAN Holdings, Inc. or the SEC. Not investment advice. Why you can rely on the Watch List.