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ADTRAN SEC Filings

NASDAQ: ADTNUtilitiesTelecommunications EquipmentUSD

7.46-0.03 (-0.40%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

ADTRAN filing overview

This page lists 60 recent SEC filings by ADTRAN (ADTN), including 29 4, 17 8-K, 4 10-Q, 4 SCHEDULE 13G/A. The latest annual report (10-K) was filed on Feb 26, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 4, 2026.

The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Aug 10, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.

Summary generated from market data by MetaCap's automated system. Methodology

ADTN SEC filings

ADTRAN SEC filings
FiledFormDescriptionDocument
Aug 10, 20264Statement of changes in beneficial ownershipView on EDGAR
Aug 10, 20268-KDeparture or Appointment of Directors or Officers; Compensatory ArrangementsView on EDGAR
Aug 7, 20264Statement of changes in beneficial ownershipView on EDGAR
Aug 4, 20268-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Aug 4, 202610-QQuarterly reportView on EDGAR
Jul 28, 20264Statement of changes in beneficial ownershipView on EDGAR
Jul 23, 20268-KEntry into a Material Definitive Agreement; Termination of a Material Definitive Agreement; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet ArrangementView on EDGAR
Jul 22, 20268-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Jul 6, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 26, 20268-KDeparture or Appointment of Directors or Officers; Compensatory Arrangements; Other EventsView on EDGAR
May 22, 20264Statement of changes in beneficial ownershipView on EDGAR
May 18, 20268-KAmendments to Articles of Incorporation or Bylaws; Change in Fiscal Year; Submission of Matters to a Vote of Security HoldersView on EDGAR
May 11, 20264Statement of changes in beneficial ownershipView on EDGAR
May 5, 20268-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
May 5, 202610-QQuarterly reportView on EDGAR
Apr 28, 2026SCHEDULE 13GBeneficial ownership report (passive)View on EDGAR
Apr 7, 20268-KDeparture or Appointment of Directors or Officers; Compensatory ArrangementsView on EDGAR
Apr 3, 20264Statement of changes in beneficial ownershipView on EDGAR
Apr 3, 20264Statement of changes in beneficial ownershipView on EDGAR
Apr 3, 20264Statement of changes in beneficial ownershipView on EDGAR
Mar 27, 2026DEF 14ADefinitive proxy statementView on EDGAR
Mar 26, 2026SCHEDULE 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR
Mar 23, 20264Statement of changes in beneficial ownershipView on EDGAR
Mar 18, 2026SCHEDULE 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR
Mar 5, 20264/AStatement of changes in beneficial ownership (amendment)View on EDGAR
Mar 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Feb 26, 20268-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Feb 26, 202610-KAnnual reportView on EDGAR
Jan 30, 20264/AStatement of changes in beneficial ownership (amendment)View on EDGAR
Jan 28, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 28, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 27, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 27, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 22, 20268-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Jan 22, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 22, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Dec 11, 20258-KDeparture or Appointment of Directors or Officers; Compensatory ArrangementsView on EDGAR
Dec 1, 20254Statement of changes in beneficial ownershipView on EDGAR
Dec 1, 20254Statement of changes in beneficial ownershipView on EDGAR
Nov 25, 20254Statement of changes in beneficial ownershipView on EDGAR
Nov 19, 20254Statement of changes in beneficial ownershipView on EDGAR
Nov 19, 20254Statement of changes in beneficial ownershipView on EDGAR
Nov 14, 2025SCHEDULE 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR
Nov 4, 20258-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Nov 4, 202510-QQuarterly reportView on EDGAR
Sep 22, 20258-KEntry into a Material Definitive Agreement; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement; Unregistered Sales of Equity SecuritiesView on EDGAR
Sep 17, 20258-KEntry into a Material Definitive Agreement; Other EventsView on EDGAR
Aug 14, 2025SCHEDULE 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR
Aug 5, 20258-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Aug 5, 202510-QQuarterly reportView on EDGAR
Jul 30, 20258-KSubmission of Matters to a Vote of Security Holders; Other EventsView on EDGAR
Jul 17, 20258-K/AAmended: Results of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Jul 16, 20258-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Jul 15, 20254Statement of changes in beneficial ownershipView on EDGAR

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