ADTRAN Holdings, Inc.
SEC Filing List

ADTN         CIK: 0000926282

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Form Description Owner/Filer Filing Agent Date Actions
10-QQuarterly report pursuant to Section 13 ...Adtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/08/04/2026
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8-KCurrent report filingAdtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/08/04/2026
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4Statement of changes in beneficial owner...Glingener ChristophDONNELLEY FINANCIAL SOLUTIONS /FA/07/28/2026
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8-KCurrent report filingAdtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/07/23/2026
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8-KCurrent report filingAdtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/07/22/2026
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S-3ASRAutomatic shelf registration statement o...Adtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/07/17/2026
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4Statement of changes in beneficial owner...Delsanto AnneDONNELLEY FINANCIAL SOLUTIONS /FA/07/06/2026
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3Initial statement of beneficial ownershi...Delsanto AnneDONNELLEY FINANCIAL SOLUTIONS /FA/07/01/2026
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11-KAnnual report of employee stock purchase...Adtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/06/26/2026
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8-KCurrent report filingAdtran Holdings, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/06/26/2026
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