Who owns MPLX (MPLX)
Which tracked institutional funds hold MPLX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MPLX company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
148 tracked funds added or opened MPLX while 68 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MPLX’s largest tracked holder by dollar value, ALPS ADVISORS INC, sizes it at 7.3% of its own reported 13F book, while the median holder sizes it at 0.3% of theirs — a 6.9pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MPLX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 644 tracked filers holding MPLX, 290 increased or opened the position and 241 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MPLX between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 15
- CIBC Bancorp USA Inc.$148M
- Aster Capital Management (DIFC) Ltd$4M
- Militia Capital Management LLC$4M
- Keeler Thomas Management LLC$2M
- Haverford Trust Co$2M
- Hartree Partners, LP$2M
Full exits 21
- CIBC Private Wealth Group LLC$145M
- JANE STREET GROUP, LLC$8M
- NORDEN GROUP LLC$8M
- WEXFORD CAPITAL LP$5M
- NewEdge Advisors, LLC$5M
- PREVAIL INNOVATIVE WEALTH ADVISORS, LLC$4M
Largest adds
- ALPS ADVISORS INC$1.5B
- BANK OF MONTREAL /CAN/$230M
- WESTWOOD HOLDINGS GROUP INC$125M
- FMR LLC$103M
- Invesco Ltd.$67M
- JPMORGAN CHASE & CO$63M
Largest trims
- BANK OF AMERICA CORP /DE/$308M
- ING GROEP NV$54M
- Brave Warrior Advisors, LLC$53M
- BROOKFIELD Corp /ON/$34M
- MORGAN STANLEY$24M
- HRT FINANCIAL LP$14M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| ALPS ADVISORS INC added | 27,070,962 | $1.5B | 13.7% | 2026-Q1 |
| Invesco Ltd. trimmed | 18,176,518 | $1.0B | 9.2% | 2026-Q1 |
| Blackstone Inc. trimmed | 15,350,683 | $876M | 7.8% | 2026-Q1 |
| TORTOISE CAPITAL ADVISORS, L.L.C. trimmed | 13,260,584 | $757M | 6.7% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 12,507,539 | $714M | 6.3% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 7,319,250 | $418M | 3.7% | 2026-Q1 |
| KAYNE ANDERSON CAPITAL ADVISORS LP trimmed | 6,826,567 | $390M | 3.5% | 2026-Q1 |
| UBS Group AG trimmed | 5,233,512 | $299M | 2.6% | 2026-Q1 |
| CHICKASAW CAPITAL MANAGEMENT LLC trimmed | 5,222,687 | $298M | 2.6% | 2026-Q1 |
| Energy Income Partners, LLC trimmed | 5,157,478 | $294M | 2.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 4,964,199 | $283M | 2.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 4,133,666 | $238M | 2.1% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 4,027,427 | $230M | 2.0% | 2026-Q1 |
| FMR LLC added | 3,360,863 | $192M | 1.7% | 2026-Q1 |
| Brave Warrior Advisors, LLC trimmed | 3,253,524 | $186M | 1.6% | 2026-Q1 |
| CIBC Bancorp USA Inc. new | 2,642,104 | $148M | 1.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 2,573,276 | $147M | 1.3% | 2026-Q1 |
| Clearbridge Investments, LLC | 2,343,689 | $134M | 1.2% | 2026-Q1 |
| MILLER HOWARD INVESTMENTS INC /NY trimmed | 2,239,694 | $128M | 1.1% | 2026-Q1 |
| WESTWOOD HOLDINGS GROUP INC added | 2,236,856 | $128M | 1.1% | 2026-Q1 |
| BROOKFIELD Corp /ON/ trimmed | 2,173,816 | $124M | 1.1% | 2026-Q1 |
| Fractal Investments LLC | 2,051,301 | $117M | 1.0% | 2026-Q1 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT trimmed | 1,859,100 | $106M | 0.9% | 2026-Q1 |
| EAGLE GLOBAL ADVISORS LLC trimmed | 1,805,346 | $103M | 0.9% | 2026-Q1 |
| ING GROEP NV trimmed | 1,768,200 | $101M | 0.9% | 2026-Q1 |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO trimmed | 1,668,467 | $95M | 0.8% | 2026-Q1 |
| AlphaCore Capital LLC added | 1,615,514 | $92M | 0.8% | 2026-Q1 |
| STIFEL FINANCIAL CORP added | 1,330,465 | $76M | 0.7% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,290,542 | $74M | 0.7% | 2026-Q1 |
| Mariner, LLC trimmed | 1,152,602 | $66M | 0.6% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 1,151,905 | $66M | 0.6% | 2026-Q1 |
| Epoch Investment Partners, Inc. trimmed | 1,127,544 | $64M | 0.6% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 1,100,009 | $63M | 0.6% | 2026-Q1 |
| INFRASTRUCTURE CAPITAL ADVISORS, LLC added | 1,068,251 | $61M | 0.5% | 2026-Q1 |
| Progeny 3, Inc. trimmed | 1,015,966 | $58M | 0.5% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 977,940 | $56M | 0.5% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 971,477 | $55M | 0.5% | 2026-Q1 |
| COHEN & STEERS, INC. added | 929,751 | $53M | 0.5% | 2026-Q1 |
| BARCLAYS PLC trimmed | 887,228 | $51M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ | 853,780 | $49M | 0.4% | 2026-Q1 |
| Allianz Asset Management GmbH | 829,136 | $47M | 0.4% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 805,230 | $46M | 0.4% | 2026-Q1 |
| Americana Partners, LLC added | 765,467 | $44M | 0.4% | 2026-Q1 |
| REAVES W H & CO INC | 670,500 | $38M | 0.3% | 2026-Q1 |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC trimmed | 579,453 | $33M | 0.3% | 2026-Q1 |
| U.S. Capital Wealth Advisors, LLC trimmed | 577,581 | $33M | 0.3% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 545,070 | $31M | 0.3% | 2026-Q1 |
| Appaloosa LP trimmed | 502,460 | $29M | 0.3% | 2026-Q1 |
| LPL Financial LLC trimmed | 476,689 | $27M | 0.2% | 2026-Q1 |
| Chicago Partners Investment Group LLC added | 486,668 | $27M | 0.2% | 2026-Q1 |
| Oxbow Advisors, LLC added | 434,012 | $25M | 0.2% | 2026-Q1 |
| Bollard Group LLC added | 405,728 | $23M | 0.2% | 2026-Q1 |
| EXCHANGE TRADED CONCEPTS, LLC trimmed | 403,877 | $23M | 0.2% | 2026-Q1 |
| Sovereign Investment Advisors, LLC added | 373,955 | $21M | 0.2% | 2026-Q1 |
| HighTower Advisors, LLC trimmed | 363,678 | $21M | 0.2% | 2026-Q1 |
| Northside Capital Management, LLC trimmed | 362,108 | $21M | 0.2% | 2026-Q1 |
| GOLDENTREE ASSET MANAGEMENT LP trimmed | 344,686 | $20M | 0.2% | 2026-Q1 |
| Maryland State Retirement & Pension System trimmed | 339,111 | $19M | 0.2% | 2026-Q1 |
| Corient Private Wealth LLC trimmed | 337,721 | $19M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 336,834 | $19M | 0.2% | 2026-Q1 |
| NEOS Investment Management LLC added | 333,984 | $19M | 0.2% | 2026-Q1 |
| Heronetta Management, L.P. added | 324,039 | $18M | 0.2% | 2026-Q1 |
| Jump Financial, LLC added | 322,233 | $18M | 0.2% | 2026-Q1 |
| Texas Yale Capital Corp. added | 317,120 | $18M | 0.2% | 2026-Q1 |
| Catalyst Capital Advisors LLC added | 278,599 | $16M | 0.1% | 2026-Q1 |
| WALNUT PRIVATE EQUITY PARTNERS, LLC added | 266,500 | $15M | 0.1% | 2026-Q1 |
| TECTONIC ADVISORS LLC added | 262,635 | $15M | 0.1% | 2026-Q1 |
| Private Capital Advisors, Inc. added | 257,752 | $15M | 0.1% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC trimmed | 253,188 | $14M | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 248,810 | $14M | 0.1% | 2026-Q1 |
| Waverly Advisors, LLC trimmed | 240,925 | $14M | 0.1% | 2026-Q1 |
| Rockefeller Capital Management L.P. added | 235,546 | $13M | 0.1% | 2026-Q1 |
| TrueMark Investments, LLC added | 231,817 | $13M | 0.1% | 2026-Q1 |
| OPAL CAPITAL LLC added | 231,535 | $13M | 0.1% | 2026-Q1 |
| &PARTNERS added | 230,542 | $13M | 0.1% | 2026-Q1 |
| DEROY & DEVEREAUX PRIVATE INVESTMENT COUNSEL INC | 227,482 | $13M | 0.1% | 2026-Q1 |
| CITIGROUP INC trimmed | 221,856 | $13M | 0.1% | 2026-Q1 |
| Empirical Finance, LLC added | 217,494 | $12M | 0.1% | 2026-Q1 |
| Empowered Funds, LLC added | 217,494 | $12M | 0.1% | 2026-Q1 |
| Adams Asset Advisors, LLC added | 216,096 | $12M | 0.1% | 2026-Q1 |
| RR Advisors, LLC added | 214,194 | $12M | 0.1% | 2026-Q1 |
| Sequoia Financial Advisors, LLC added | 200,244 | $11M | 0.1% | 2026-Q1 |
| Cetera Investment Advisers trimmed | 199,111 | $11M | 0.1% | 2026-Q1 |
| UNITED CAPITAL FINANCIAL ADVISORS, LLC added | 187,804 | $11M | 0.1% | 2026-Q1 |
| AVENIR CORP | 186,892 | $11M | 0.1% | 2026-Q1 |
| EVERGREEN CAPITAL MANAGEMENT LLC trimmed | 183,994 | $11M | 0.1% | 2026-Q1 |
| GLENMEDE TRUST CO NA | 175,835 | $10M | 0.1% | 2026-Q1 |
| Advisors Asset Management, Inc. added | 163,380 | $9M | 0.1% | 2026-Q1 |
| HENNESSY ADVISORS INC trimmed | 162,519 | $9M | 0.1% | 2026-Q1 |
| Parkwood LLC trimmed | 161,615 | $9M | 0.1% | 2026-Q1 |
| Advisors Capital Management, LLC added | 156,972 | $9M | 0.1% | 2026-Q1 |
| Gilman Hill Asset Management, LLC added | 154,975 | $9M | 0.1% | 2026-Q1 |
| CIBC Private Wealth Group LLC added | 2,724,200 | $145M | 1.3% | 2025-Q4 stale |
| AMUNDI | 1,410,705 | $74M | 0.7% | 2025-Q1 stale |
| BEACH INVESTMENT COUNSEL INC/PA trimmed | 848,333 | $45M | 0.4% | 2025-Q1 stale |
| Delphi Financial Group, Inc. | 341,079 | $18M | 0.2% | 2025-Q1 stale |
| Distillate Capital Partners LLC trimmed | 353,730 | $18M | 0.2% | 2025-Q3 stale |
| NBW CAPITAL LLC trimmed | 249,837 | $13M | 0.1% | 2025-Q2 stale |
| Northeast Financial Consultants Inc | 230,478 | $12M | 0.1% | 2025-Q2 stale |
| Glenmede Investment Management, LP added | 192,035 | $10M | 0.1% | 2025-Q3 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.