901 EXPLORER BLVD, HUNTSVILLE, AL
Amendment to Christoph Glingener's Employment Agreement at Adtran Networks
Reports Second Quarter 2026 Financial Results
Strengthens Capital Structure with New Senior Secured Credit Facility
Preliminary Revenue and Non-GAAP Operating Margin Below Guidance Range and Preliminary Earnings Per Share Expected Below Analyst Consensus for Q2 2026
Appoints Anne DelSanto to Board of Directors
Charter Amendment Approved at ADTRAN Holdings, Inc. Annual Meeting
Reports First Quarter 2026 Financial Results
Amendment to Thomas Stanton’s Employment Agreement at ADTRAN Holdings
Q1
FY 2024
Q3
Q2
Amended Annual Report
Notice of Late Filing for Quarterly Report
S-3ASR
Effectiveness Notice
Registration Statement for Securities Offered under a Shelf Registration
Registration Statement for Securities to be Offered to Employees
Notice of Suspension of Duty to File Reports
Additional Proxy Materials
Definitive Proxy Statement
PRE 14A
Statement of Changes in Beneficial Ownership
Initial Statement of Beneficial Ownership
Annual Report of Employee Stock Purchase
Notice of Proposed Sale of Securities
Specialized Disclosure Report
Definitive Revised Proxy Statement