Kangaroo is the brand name of convenience stores operated by The Pantry, a publicly held corporation. According to the company profile on Yahoo Finance, "The company's gasoline operations include the provision of a mix of branded and private brand gasoline..." The major shareholders are a mix of mutual funds and financial institutions.

I could find no link between Exxon and Kangaroo/Pantry.

According to an article in the Chatanooga Times/Free Press from 11/27/2004 headlined "Pantry drops Exxon gas for BP/Amoco brand in its Golden Gallon stores," which mentions that several Gloden Gallon stations would be renamed to Kangaroo, "Kangaroo Express can sell any combination of BP/Amoco gas and Kangaroo brand gas...Kangaroo brand gas is made by Citgo..."

You can find a great deal of financial information on the investors pages of the company website.