ADTRAN, Inc. to Release Second Quarter Earnings on July 17, 2018

HUNTSVILLE, Ala.–(BUSINESS WIRE)–ADTRAN, Inc. (NASDAQ: ADTN) announced today that the Company will
release its financial results for the second quarter 2018 after market
close on Tuesday, July 17, 2018. The Company will conduct a conference
call on Wednesday, July 18, 2018, to discuss the results for the quarter.

What: ADTRAN Earnings Call
When: 9:30 a.m. Central
Time on Wednesday, July 18. 2018
Where: www.adtran.com/investor

ADTRAN will webcast this conference. To listen, simply visit the
Investor Relations site at www.adtran.com/investor
approximately 10 minutes prior to the start of the call and click on the
conference call link provided. An online replay of the conference call,
as well as the text of the Company’s earnings release, will be available
on the Investor Relations site approximately 24 hours following the call
and will remain available for at least 12 months.

About ADTRAN

ADTRAN, Inc. is the leading global provider of networking and
communications equipment. ADTRAN’s products enable voice, data, video
and internet communications across a variety of network infrastructures.
ADTRAN solutions are currently in use by service providers, private
enterprises, government organizations and millions of individual users
worldwide. For more information, please visit us at www.adtran.com,
LinkedIn
and Twitter.

Contacts

ADTRAN, Inc.
Investor Services/Assistance:
Cathy
Hoffman-Young, 256-963-8220
investor@adtran.com