Lumen Technologies, Inc. is an American telecommunications company headquartered in Monroe, Louisiana. It offers network, security, cloud, voice, and other managed communications services through its fiber optic and copper networks, data centers and cloud computing services. The company has been included in the S&P 600 index since March 2023, and was previously listed among the S&P 500. Its communications services have included local and long-distance voice, broadband internet, Multiprotocol Label Switching, private line, Ethernet, hosting, data integration, video, network, public access, Voice over Internet Protocol, information technology, and other ancillary services. Lumen has gone through many acquisitions, divestments, and structural changes. In the 20th century, this primarily consisted of buying and selling local telecom providers. Larger mergers at the beginning of the 21st century added internet service providing to Lumen's core business. As cloud computing became more important, Lumen acquired businesses serving enterprise cloud customers, while divesting its consumer connectivity business to AT&T and Brightspeed.