Who holds ticker verified against the SEC company list on 2026-09-10 — a reviewed name-and-class mapping row, never an inferred symbol. how tickers are mapped ↗

MPLX LP · COM UNIT REP LTD · Q1 2026 · 8 members disclosed MPLX ↗
13F filers reporting this class for the quarter ended 2026-03-31
463
sum of the reported values across every holder; undisclosed values are left out, never counted as zero
$8.5B
holders whose share count rose or who opened the position (new + add), by shares
213
holders absent this quarter after holding last quarter — inferred from absence, not a sale record
53
FILING WINDOW OPEN
Q3 2026 filings are due by 2026-11-16 — figures for that quarter will change; missing filers are not zeros.

Holders — quarter ended 2026-03-31

by reported value · Δ shares vs 2025-12-31Holders rank by reported value. The change kind — new, add, trim or exit — is read from the share count against the prior quarter, never from the reported value.
13F holders of MPLX ranked by reported value, 1–25 of 500 holders
#FilerReported valueSharesΔ sharesChange
1ALPS ADVISORS INC$1.5B27,070,962+26,641,396ADD
2Invesco Ltd.$1.0B18,266,606+78,728ADD
3Blackstone Inc.$876M15,350,683−354,802TRIM
4MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.$418M7,319,250+410,868ADD
5KAYNE ANDERSON CAPITAL ADVISORS LP$390M6,826,567−400,833TRIM
6UBS Group AG$299M5,233,512−71,234TRIM
7MORGAN STANLEY$283M4,964,199−798,911TRIM
8BANK OF MONTREAL /CAN/$230M4,027,427+4,021,783ADD
9FMR LLC$192M3,360,863+1,692,220ADD
10Brave Warrior Advisors, LLC$186M3,253,524−1,220,591TRIM
11CIBC Bancorp USA Inc.$148M2,642,104—NO PRIOR
12BANK OF AMERICA CORP /DE/$147M2,573,276−5,957,790TRIM
13Clearbridge Investments, LLC$134M2,343,6890NO CHANGE
14WESTWOOD HOLDINGS GROUP INC$128M2,236,856+2,194,739ADD
15BROOKFIELD Corp /ON/$124M2,173,816−786,014TRIM
16Fractal Investments LLC$117M2,051,3010NO CHANGE
17CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT$106M1,859,100−24,700TRIM
18EAGLE GLOBAL ADVISORS LLC$103M1,805,346−79,239TRIM
19ING GROEP NV$101M1,768,200−1,135,600TRIM
20DUFF & PHELPS INVESTMENT MANAGEMENT CO$95.2M1,668,467+1,668,467NEW
21AlphaCore Capital LLC$92.2M1,615,514+8,912ADD
22STIFEL FINANCIAL CORP$75.9M1,330,465+2,326ADD
23Mariner, LLC$65.8M1,152,602−674TRIM
24ROYAL BANK OF CANADA$65.7M1,151,905+360,427ADD
25Epoch Investment Partners, Inc.$64.3M1,127,544−29,045TRIM
Show all 500 holders
Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.

Congress ↔ notable managers · MPLX

Congress · last 90 days

Buyers
0 — —
Sellers
0 — —

filed 2026-07-31 → 2026-10-29 · statutory ranges

Use of congressional disclosure reports for commercial purposes, credit decisions or solicitation is restricted by 5 U.S.C. §13107(c).

Notable managers · quarter ended 2026-03-31

Adding
0 — $0 held
Trimming
1 Appaloosa $28.7M held

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · MPLX LP

Merged timeline of congressional filings and notable-manager moves on MPLX
DateWhoChangeSize
2026-05-15Appaloosa 13FTRIM−125,040 sh

1 newest, by filing date · 13F rows are quarter-end snapshots, not trades

A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗

13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.

Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.

Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.

Affiliated managers may report the same position, so one position can appear under more than one filer.

Positions under confidential treatment may be omitted until a later amendment discloses them.

These are disclosures, not investment advice.