Security Snapshot

MPLX LP - COM UNIT REP LTD (MPLX) Institutional Ownership

CUSIP: 55336V100

13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

618

Shares (Excl. Options)

178,189,519

Price

$53.37

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Type / Class
Equity / COM UNIT REP LTD
Symbol
MPLX on NYSE
Price per share
$57.07
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
178,189,519
Total reported value
$9,511,069,165
% of total 13F portfolios
0.02%
Share change
-32,246,951
Value change
-$1,718,596,110
Number of holders
618
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • MPLX - MPLX LP - COM UNIT REP LTD is tracked under CUSIP 55336V100.
  • 618 institutions reported positions in Q4 2025.
  • Schedule 13D/13G significant owner rows are not currently available.

What Changed

  • Holder count moved from 618 to 121 between Q4 2025 and Q1 2026.
  • Reported value moved from $9,511,069,165 to $754,808,810.

Why This Matters

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 618 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 55336V100?
CUSIP 55336V100 identifies MPLX - MPLX LP - COM UNIT REP LTD in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

As of 31 Dec 2025, 618 institutional investors reported holding 178,189,519 shares of MPLX LP - COM UNIT REP LTD (MPLX).

Institutional Holders of MPLX LP - COM UNIT REP LTD (MPLX) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 13,229,495 $754,808,810 -$50,074,693 $57.07 121
2025 Q4 178,189,519 $9,511,069,165 -$1,718,596,110 $53.37 618
2025 Q3 210,064,487 $10,493,868,664 -$319,527,138 $49.95 574
2025 Q2 216,682,323 $11,160,989,501 +$2,028,926 $51.51 569
2025 Q1 217,765,452 $11,626,105,367 +$3,639,038 $53.52 561
2024 Q4 218,193,154 $10,446,031,254 -$652,817,166 $47.86 532
2024 Q3 231,975,934 $10,312,339,141 -$246,295,588 $44.46 498
2024 Q2 238,259,476 $10,145,135,237 +$338,322,862 $42.59 487
2024 Q1 225,524,342 $9,320,548,328 +$144,201,860 $41.56 474
2023 Q4 221,809,148 $8,146,241,789 -$270,905,623 $36.72 439
2023 Q3 229,836,578 $8,176,118,339 +$160,598,246 $35.57 394
2023 Q2 224,515,401 $7,620,833,879 -$210,129,319 $33.94 367
2023 Q1 229,911,262 $7,905,808,396 +$194,558,235 $34.45 377
2022 Q4 224,017,424 $7,355,991,805 -$255,141,787 $32.84 352
2022 Q3 232,185,926 $6,974,491,008 -$206,401,084 $30.01 339
2022 Q2 239,104,060 $6,970,972,422 -$217,207,666 $29.15 338
2022 Q1 247,336,508 $8,206,305,245 -$197,177,146 $33.18 348
2021 Q4 252,616,745 $7,480,013,686 -$369,006,406 $29.59 340
2021 Q3 263,757,389 $7,514,046,223 -$379,907,001 $28.47 308
2021 Q2 276,629,816 $8,189,905,805 -$265,141,081 $29.61 299
2021 Q1 286,177,329 $7,336,791,427 -$297,270,876 $25.63 304
2020 Q4 297,854,905 $6,453,774,340 -$71,864,816 $21.65 290
2020 Q3 302,214,756 $4,764,434,340 -$61,260,306 $15.74 271
2020 Q2 305,236,742 $5,275,216,596 +$488,812,072 $17.28 271
2020 Q1 315,296,267 $3,663,927,761 -$161,720,959 $11.62 284
2019 Q4 324,811,430 $8,273,313,728 -$280,930,939 $25.46 325
2019 Q3 334,570,085 $9,370,826,541 +$2,151,939,420 $28.01 331
2019 Q2 245,744,708 $7,907,695,892 +$345,071,373 $32.19 325
2019 Q1 244,966,213 $8,057,319,019 -$51,180,408 $32.89 318
2018 Q4 247,589,517 $7,503,290,980 +$23,521,039 $30.30 323
2018 Q3 246,290,489 $8,541,397,407 +$14,753,074 $34.68 319
2018 Q2 247,498,313 $8,451,510,627 +$326,394,576 $34.14 319
2018 Q1 238,163,459 $7,868,008,646 -$826,578,881 $33.04 316
2017 Q4 253,013,584 $8,974,843,334 +$249,247,530 $35.47 304
2017 Q3 265,273,321 $9,286,304,257 +$292,934,544 $35.01 293
2017 Q2 257,201,121 $8,590,751,366 +$353,546,458 $33.40 307
2017 Q1 246,380,611 $8,852,978,029 +$33,833,681 $36.08 307
2016 Q4 246,831,218 $8,533,039,861 +$479,890,883 $34.62 290
2016 Q3 232,472,886 $7,865,107,462 +$708,251,571 $33.86 277
2016 Q2 211,689,011 $7,118,838,717 +$104,214,523 $33.63 276
2016 Q1 208,282,059 $6,183,248,577 +$248,439,680 $29.69 268
2015 Q4 199,183,476 $7,768,356,281 +$6,807,397,753 $39.33 301
2015 Q3 24,768,156 $946,311,341 +$93,035,941 $38.21 114
2015 Q2 21,822,006 $1,557,664,607 +$14,693,342 $71.38 113
2015 Q1 21,802,694 $1,597,268,179 +$12,592,894 $73.26 107
2014 Q4 21,251,419 $1,561,700,043 +$204,851,108 $73.49 105
2014 Q3 18,388,862 $1,083,255,000 -$16,333,111 $58.94 82
2014 Q2 18,685,259 $1,204,818,640 -$23,604,330 $64.50 78
2014 Q1 19,244,749 $943,087,657 +$17,828,350 $48.99 73