Zexxon was a fuel company in the Solana Galaxy. Before the events of Ratchet: Deadlocked, a Zexxon tanker ship crashed on Aquatos, killing many baby Lunar Seals. Vox News lied that the tanker ship was piloted by Ratchet.
Behind the scenes
It is a reference to the real-life company Exxon. 
- Ratchet: Deadlocked (first appearance)