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ADTRAN was incorporated under the laws of Delaware in November 1985, and commenced operations in January 1986.

ADTRAN’s fiscal year-end is December 31. Reporting quarters correspond with calendar quarters.

The annual shareholders meeting is usually held in May of each year.

ADTRAN’s auditors are PricewaterhouseCoopers (Birmingham, AL).

As of December 31, 2019, ADTRAN had 1,790 full-time employees in the U.S. and in its international subsidiaries located in North America, Latin America, EMEA and the APAC regions.

Please see our Management Team page for details.

View the ADTRAN Board of Directors page.

ADTRAN's corporate headquarters is located in Huntsville, Alabama, in the second largest research park in the United States. We have engineering research and development centers in Huntsville, AL; Portland, OR; Dallas, TX; and Greifswald and Berlin, Germany. We also have sales and support offices located throughout the U.S. and around the world.

We compete with a number of companies in the markets we serve. In our Access & Aggregation category, key competitors include Calix, Casa Systems, Ciena, CommScope, DASAN Zhone Solutions, Huawei, Nokia and ZTE. In the Subscriber Solutions & Experience category, our primary competitors include Calix, Cisco, CommScope, Hewlett Packard Enterprise, Ribbon Communications, Technicolor and Ubiquiti Networks. In addition to these OEM vendors, we face increasing competition from various ODM vendors who are being engaged directly by some of our service provider customers. Some of these companies compete in a single product segment, while others compete across multiple product lines. Competitors of our Services & Support business include Calix, Ericsson, Fujitsu Network Communications and Nokia.

ADTRAN went public on August 9, 1994 at $18.00 ($4.50 on a split adjusted basis).