UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to _______ Commission File Number: 001-41446 ADTRAN Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 87-2164282 (State or o ...

ADTRAN Holdings, Inc. (NASDAQ:ADTN) Q2 2023 Earnings Conference Call August 8, 2023 10:30 AM ET Company Participants Tom Stanton - Chief Executive Officer Uli Dopfer - Senior Vice President and Chief Financial Officer Conference Call Participants Michael Genovese - Rosenblatt Securities Greg Mesniaeff - WestPark Capital George Notter - Jefferies Ryan Koontz - Needham & Company Bill Dezellem - Tieton Capital Management Operator Ladies and gentlemen, thank you for standing by, and welcome to ADTRAN Holdings, ...

ADTRAN Holdings, Inc. (NASDAQ:ADTN) Q1 2023 Earnings Conference Call May 9, 2023 10:30 AM ET Company Participants Tom Stanton - Chief Executive Officer Uli Dopfer - Chief Financial Officer Christoph Glingener - Chief Technology Officer Conference Call Participants Michael Genovese - Rosenblatt Securities George Notter - Jefferies Ryan Koontz - Needham & Company Greg Mesniaeff - WestPark Capital Paul Essi - William K. Woodruff Company Tim Savageaux - Northland Capital Markets Operator Ladies and gentlemen, t ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to _______ Commission File Number: 001-41446 ADTRAN Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 87-2164282 (State or ...

12liability of warranty UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission file number 000-41446 ADTRAN Holdings, Inc. (Exact name of registrant as specified in its charter) Delaware 87-2164282 (State of Incorporat ...

ADTRAN Holdings, Inc. (NASDAQ:ADTN) Q4 2022 Earnings Conference Call February 21, 2023 10:30 AM ET Company Participants Tom Stanton - Chief Executive Officer Mike Foliano - Chief Financial Officer Conference Call Participants Andrew King - Rosenblatt Securities Ryan Koontz - Needham Greg Mesniaeff - WestPark Capital Paul Essi - William K. Woodruff & Company Tim Savageaux - Northland Capital Markets Operator Ladies and gentlemen, thank you for standing by, and welcome to the ADTRAN Holdings, Inc. Fourth Quar ...

ADTRAN Holdings, Inc. (NASDAQ:ADTN) Q2 2022 Earnings Conference Call August 4, 2022 10:30 AM ET Company Participants Tom Stanton - Chief Executive Officer Mike Foliano - Chief Financial Officer Conference Call Participants Michael Genovese - Rosenblatt Securities Paul Essi - William K. Woodruff Paul Silverstein - Cowen Ryan Koontz - Needham & Company Tim Savageaux - Northland Capital Markets Operator Ladies and gentlemen, thank you for standing by and welcome to ADTRAN Holdings’ Second Quarter 2022 Earnings ...

ADTRAN, Inc. (NASDAQ:ADTN) Q1 2022 Earnings Conference Call May 5, 2022 10:30 AM ET Company Participants Tom Stanton - Chief Executive Officer Mike Foliano - Chief Financial Officer Conference Call Participants Bala Reddy - Goldman Sachs Michael Genovese - Rosenblatt Securities Bill Dezellem - Tieton Capital Paul Essi - William K. Woodruff Tim Savageaux - Northland Capital Fahad Najam - Loop Capital Orin Hirschman - AIGH Operator Ladies and gentlemen, thank you for standing by and welcome to ADTRAN's First ...