On August 10, 2020, John S. Swearingen, Executive Vice President, Logistics and Storage of the general partner of MPLX LP announced his plan to retire effective August 28, 2020 Upon his retirement, Mr. Swearingen will also retire from all positions he holds with any MPLX affiliate, including Marathon Petroleum Corporation ("MPC"). Mr. Swearingen's responsibilities will be assumed by existing executives of the general partner of MPLX, Timothy J. Aydt and Gregory S. Floerke.