Marathon Petroleum MPC Institutional Ownership

Updated Oct 11, 2026

Marathon Petroleum Corp (NYSE:MPC) was held by 1,925 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• These investors held 75.65% of outstanding shares in Q2 2026, up from 74.34% the quarter before.
• Total shares held in MPC fell 0.32% from Q1 2026; the number of holders rose 23.56% from Q2 2025.
• Of the 1,925 holders, 850 added to their positions, 699 reduced their stakes and 376 left their positions unchanged in Q2 2026.
• The aggregate institutional position in Marathon Petroleum was 218.63Mn shares at the end of Q2 2026, down 691.55K from the prior quarter and down 6.31Mn from a year earlier.
• As of June 30, 2026, the biggest holder of Marathon Petroleum was BlackRock, Inc. with 26.01Mn shares, or 9.00% of shares outstanding.
• The largest position increases in MPC for Q2 2026 were by BlackRock, Inc. (+1.61Mn shares), Victory Capital Management Inc (+593.53K shares), American Century Companies Inc (+561.83K shares), T. Rowe Price Associates Inc (+556.8K shares) and Geode Capital Management, LLC (+529.63K shares).
• On the other side, among holders that kept a position in Marathon Petroleum, the largest reductions in Q2 2026 came from Harris Associates L.P. (-2.58Mn shares), Wellington Management Group LLP (-2.39Mn shares), Boston Partners (-2.13Mn shares), JPMorgan Chase & Co (-699.61K shares) and Canada Pension Plan Investment Board (-610.08K shares).
• According to Business Quant data, the leading holders of MPC for Q2 2026 were BlackRock, Inc. (26.01Mn shares), Vanguard Capital Management LLC (19.07Mn shares), State Street Corp (18.47Mn shares), Vanguard Portfolio Management LLC (15.63Mn shares), Geode Capital Management, LLC (8.35Mn shares), Morgan Stanley (5.89Mn shares), Raymond James Financial Inc (5.68Mn shares), FMR LLC (5.42Mn shares), Bank of New York Mellon Corp (4.03Mn shares) and Boston Partners (3.52Mn shares).