YOUR VOTE IS IMPORTANT!
If you have voting rights you may use www.proxyvote.com to cast your vote until 11:59 P.M. Eastern Time on May 23, 2023, for shares held by registered holders directly and 11:59 P.M. Eastern Time on May 21, 2023, for shares held in the Marathon Oil Company Thrift Plan. Please have your voting control number available when you access the web site and follow the instructions to submit an electronic voting instruction form.