Item 5.07Submission of Matters to a Vote of Security Holders.

ADTRAN, Inc. (the "Company") held its Annual Meeting of Stockholders on May 12, 2021 (the "Annual Meeting"). At the Annual Meeting, the Company's stockholders (i) elected six directors to serve until the 2022 Annual Meeting of Stockholders (Proposal 1); (ii) approved, on an advisory basis, the compensation of the Company's named executive officers (Proposal 2); and, (iii) ratified the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm of the Company for the fiscal year ending December 31, 2021 (Proposal 3). The voting results for these proposals are presented in the tables below:

Proposal 1 - Election of Directors





                       For          Against     Abstain     Broker Non-Votes
Thomas R. Stanton    40,312,653       904,678     26,849            4,059,737
H. Fenwick Huss      40,272,470       957,406     14,304            4,059,737
Gregory J. McCray    41,019,700       211,479     13,001            4,059,737
Balan Nair           35,777,561     5,450,186     16,433            4,059,737
Jacqueline H. Rice   40,726,309       492,420     25,451            4,059,737
Kathryn A. Walker    40,820,707       390,946     32,527            4,059,737

Proposal 2 - Advisory Vote Regarding Compensation of the Company's Named Executive Officers





    For         Against    Abstain     Broker Non-Votes
  40,536,882     630,642     76,656            4,059,737

Proposal 3 - Ratification of the Appointment of PricewaterhouseCoopers LLP as the Company's Independent Registered Public Accounting Firm for the Fiscal Year Ending December 31, 2021





    For         Against    Abstain
  44,590,519     688,063     25,335

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