Latest Period
Q1 2026
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
Institutions Reporting
644
Shares (Excl. Options)
202,783,115
Price
$57.07
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- Security type / class
- Equity / COM UNIT REP LTD
- Symbol
- MPLX on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 202,783,115
- Total 13F value
- $11,571,492,446
- Portfolio coverage rank
- 0.02%
- Share change
- +27,071,172
- Value change
- +$1,546,178,746
- Number of holders
- 644
- SEC-reported price per share
- $56.27
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
1 identity field
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MPLX - MPLX LP - COM UNIT REP LTD is tracked under CUSIP 55336V100.
- 644 institutions reported positions in Q1 2026.
- Schedule 13D/13G significant owner rows are not currently available.
Change
- Holder count moved from 629 to 644 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $9,516,040,571 to $11,571,492,446.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 644 institutions filings for Q1 2026.
Security key
55336V100
Latest holder period
Q1 2026
13F holders
644
13D/G owners
0
CIK / CUSIP context first
Open Q1 2026 holders
MPLX full holder history
MPLX LP SEC filings
MPLX LP company facts
MPLX LP insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 55336V100:
As of 31 Mar 2026, 644 institutional investors reported holding 202,783,115 shares of MPLX LP - COM UNIT REP LTD (MPLX).
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 202,783,115 | $11,571,492,446 | +$1,546,178,746 | $57.07 | 644 |
| 2025 Q4 | 178,282,669 | $9,516,040,571 | -$1,716,398,094 | $53.37 | 629 |
| 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 |