Tenneco
![Fairchild F-27J executive aircraft of Tenneco at Chicago O'Hare Airport in 1979](/Images/godic/202502/15/Fairchild_F-27J_N516T_124_ORD_30.09.79_edited-25140.jpg")
Tenneco (formerly Tenneco Automotive and originally Tennessee Gas Transmission Company) is an American Fortune 500 company that has been publicly traded on the NYSE since November 5, 1999 under the symbol TEN. Tenneco, with headquarters in Lake Forest, Illinois, United States is an automotive components original equipment manufacturer and an after-market ride-control and emissions products. In 2011 it reported a revenue of $7.2 billion.