0001126975-20-000077 DEFA14A 1 20200407 20200407 20200407 Magellan Midstream Partners, L.P. 0001126975 4610 731599053 DE 1231 DEFA14A 34 001-16335 20778830 ONE WILLIAMS CENTER, MD 28-1 TULSA OK 74172 918 574 7000 ONE WILLIAMS CENTER, MD 28-1 TULSA OK 74172 MAGELLAN MIDSTREAM PARTNERS, L.P. 20190718 MAGELLAN MIDSTREAM PARTNERS LP 20030827 WILLIAMS ENERGY PARTNERS L P 20001024 DEFA14A 1 defa14aannualmeeting2020.htm DEFA14A - 2020 VIRTUAL ANNUAL MEETING