CenturyLink was founded in 1968 as Central Telephone and Electronics Corporation. In 1971, the name was changed to Century Telephone Enterprises and then to CenturyTel in 1999.
Oak Ridge Telephone Company originally served 3 states with around 10,000 access lines. In 1968, Oak Ridge incorporated as Central Telephone and Electronics.
In 1978, the company went public and began to trade on the NYSE under symbol CTL.
In 1989, Universal Telephone was acquired. In 1992, Central Telephone Company of Ohio was added to the company.
In 2008, Embarq acquired CenturyTel. In 2010, the name was changed to CenturyLink.
In 2014, the company acquired both DataGardens and Cognilytics.
The company acquired SEAL Consulting in January 2017.
In August 2020, CenturyLink experienced a major internet failure that lasted for several hours. The company restored all systems after several hours but offered no explaination for the outage.
In September 2020, the company announced that it was rebranding under the name Lumen Technologies. The ticker symbol has been changed to LUMN.