Level 3 Communications
Launched as a subsidiary of a construction group in 1985, Level 3 went public in 1998 and then spent nearly 20 years acquiring other companies such as Genuity, Broadwing Corp., ICG Communications, Global Crossing and TW Telecom. On Oct. 31, 2016, CenturyLink (now Lumen) announced its intent to acquire Level 3. The deal closed on Nov. 1, 2017.