MARATHON PETE CORP

MPC (Marathon Petroleum Corporation) Q1 2026: 1,809 holders, $52.1B in institutional value. BlackRock $6.0B (24.4M shares, INCREASED +1.97M from 22.4M prior, +$2.31B) is the largest buyer -- the biggest single MPC add this quarter. State Street $4.6B (19.0M shares, INCREASED +1.09M from 17.9M prior, +$1.73B) -- second largest. Vanguard total $9.4B across three entities: Capital Management $4.7B (19.2M shares), Portfolio Management $3.8B (15.7M shares), Fiduciary Trust $406M (1.7M shares) -- three NEW positions. Geode Capital $1.9B (7.8M shares, +0.7%, +$644M). FMR/Fidelity $1.2B (4.9M shares, INCREASED +1.44M from 3.5M prior, +$635M). Goldman Sachs $717M (2.9M shares, INCREASED +0.3M, +$291M). JPMorgan $842M (3.4M shares, +0.7%, +$322M). Invesco $691M (2.8M shares, +0.9%, +$268M). Bank of America $634M (2.6M shares, +0.4%, +$218M). Morgan Stanley $1.5B (6.1M shares, -0.02% change but valueChange +$494M). Raymond James $1.4B (5.8M shares, -0.07%, -$464M). Boston Partners $1.4B (5.6M shares, -0.08%, -$381M). Wellington Management $1.4B (5.6M shares, -0.22%, -$205M). Bank of New York Mellon $965M (4.0M shares, -0.10%, -$248M). Northern Trust $776M (3.2M shares, -0.03%, -$241M). Dimensional Fund Advisors (quasi_passive) $754M (3.1M shares, -0.08%, -$210M). Charles Schwab IM $666M (2.7M shares, -0.03%, -$208M). Harris Associates $685M (2.8M shares, -0.13%, -$29M). Ameriprise $543M (2.2M shares, -0.01%, flat). New positions: Vanguard three NEW entities totalling $9.4B. Sellers: Raymond James -$464M, Boston Partners -$381M, Northern Trust -$241M, Bank of NY Mellon -$248M, DFA -$210M, Schwab IM -$208M, Wellington -$205M, Ameriprise flat. Buyers: BlackRock +$2.31B (largest), State Street +$1.73B, FMR +$635M, Geode +$644M, JPMorgan +$322M, Goldman +$291M, Invesco +$268M, BofA +$218M. SMART-MONEY READ: MPC Q1 2026 is BULLISH on energy midstream. The two largest holders (BlackRock +$2.31B and State Street +$1.73B) are making their biggest MPC additions in recent memory, and both are index/smart-beta shops whose flows reflect underlying benchmark inclusion rather than pure active conviction. What makes this quarter notable is that the buy-cohort is not just passive: FMR ($635M), Geode ($644M), Goldman ($291M), and JPMorgan ($322M) are all active shops adding at scale. The sell-cohort (Raymond James -$464M, Boston Partners -$381M, Wellington -$205M) is structurally smaller than the buy-cohort, and notably Raymond James and Boston Partners are both regional/value shops whose MPC books tend to be smaller in the first place. Net read: MPC's Q1 2026 institutional record is strongly bullish -- this is the clearest energy-sector conviction signal in this batch, with multiple active shops scaling into the name simultaneously. The three Vanguard NEW entries ($9.4B) are mechanically driven by Q1 2026 fund-structure changes; they confirm broad index inclusion rather than directional conviction.