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Of the 15 tracked institutions holding MPC, 9 have a 3-year clone track record — 6 of them beat the S&P. Average holder's clone alpha: +2.0pt. It's a gauge of who owns the name, not just how many.
Among the 15 tracked institutional investors we monitor, MPC (MARATHON PETE CORP) is held with a combined value of $20.80B across 97,964,914 shares. The largest holder is VANGUARD GROUP INC with a position worth $6.23B (0.09% of their portfolio). 7 funds increased their holdings. 8 funds reduced their position.
Total Institutional Value
$20.80B
Total Shares Held
97,964,914
Institutional Holders
15
% of Shares Outstanding
33.6%
of 291.94M shares · SEC 2026-04-30
Days to Cover
2.6-5.0%
7.29M shares short · FINRA 2026-06-30
Tracked 13F institutions hold 33.6% of MPC's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-04-30), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
0
$0
1
$368.73K
Total Transactions
1
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Jun 4, 2026 | Michael A Henschen II | S | Sale | 1,372 | $368.73K |
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $6.23B | 0.09% | -0.1% |
| 2 | BlackRock, Inc. | $5.96B | 0.10% | +8.8% |
| 3 | STATE STREET CORP | $4.65B | 0.16% | +6.1% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | $1.38B | 0.26% | -21.7% |
| 5 | FMR LLC | $1.20B | 0.06% | +41.4% |
| 6 | HARRIS ASSOCIATES L P | $685.16M | 0.92% | -30.4% |
| 7 | PRICE T ROWE ASSOCIATES INC /MD/ | $313.31M | 0.04% | -37.7% |
| 8 | MILLENNIUM MANAGEMENT LLC | $129.25M | 0.05% | -13.6% |
| 9 | AQR CAPITAL MANAGEMENT LLC | $105.63M | 0.05% | +5.7% |
| 10 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $58.42M | 0.09% | +39.6% |
| Member | Type | Date |
|---|---|---|
| Dan Newhouse | Sell | Jul 10, 2026 |
| David J. Taylor | Sell | Mar 11, 2026 |
| David J. Taylor | Sell | Feb 26, 2026 |
| David J. Taylor | Buy |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of MPC with a position worth $6.23B, representing 0.09% of their portfolio. In total, 15 institutional investors hold MPC with a combined value of $20.80B.
Institutional investors hold $20.80B worth of MPC stock across 15 positions. The largest institutional holder is VANGUARD GROUP INC with $6.23B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MPC, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MPC positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Aug 14, 2025 |
| David J. Taylor | Sell | Jul 18, 2025 |
| Rob Bresnahan | Buy | May 15, 2025 |
| Jefferson Shreve | Sell | May 12, 2025 |
| Dan Newhouse | Sell | Apr 11, 2025 |
Showing 8 of 18. STOCK Act disclosures lag up to 45 days.
Last Close
$309.24
2026-07-24
YTD
+87.3%
93% of 52-week range
