Comparable stake leader
ALPS ADVISORS INC
SEC ownership of MPLX LP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001552000.
Disclosed value leader
ALPS ADVISORS INC
Comparable rows
0/50
Latest evidence
15 May 2026
- Public ticker
- MPLX on NYSE, MPLXP on OTC
- Parsed ownership sources
- 13F and 3/4/5
- Largest SEC-reported holder
- ALPS ADVISORS INC
- Latest parsed ownership date
- 15 May 2026
- Issuer CIK
- 0001552000
- Issuer location
- Findlay, OH
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of MPLX LP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
ALPS ADVISORS INC
Disclosed value leader
ALPS ADVISORS INC
Comparable rows
0/50
Latest evidence
15 May 2026
13F
3/4/5
Highest disclosed value: $1,544,939,801
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
ALPS ADVISORS INC has the largest disclosed position value at $1.54B.
0 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens ALPS ADVISORS INC's linked filing trail.
Disclosed position value
Top 5
ALPS ADVISORS INC
$1.54B
Invesco Ltd.
$1.04B
Blackstone Inc.
$876.06M
TORTOISE CAPITAL ADVISORS, L.L.C.
$756.78M
GOLDMAN SACHS GROUP INC
$713.81M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ALPS ADVISORS INC |
13F
Company
|
—
class O/S missing
|
$1,544,939,801
27,070,962 shares
|
— | 31 Mar 2026 |
| Invesco Ltd. |
13F
Company
|
—
class O/S missing
|
$1,042,475,205
18,266,606 shares
|
— | 31 Mar 2026 |
| Blackstone Inc. |
13F
Company
|
—
class O/S missing
|
$876,063,479
15,350,683 shares
|
— | 31 Mar 2026 |
| TORTOISE CAPITAL ADVISORS, L.L.C. |
13F
Company
|
—
class O/S missing
|
$756,781,528
13,260,584 shares
|
— | 31 Mar 2026 |
| GOLDMAN SACHS GROUP INC |
13F
Company
|
—
class O/S missing
|
$713,805,262
12,507,539 shares
|
— | 31 Mar 2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. |
13F
Company
|
—
class O/S missing
|
$417,709,598
7,319,250 shares
|
— | 31 Mar 2026 |
| KAYNE ANDERSON CAPITAL ADVISORS LP |
13F
Company
|
—
class O/S missing
|
$389,592,179
6,826,567 shares
|
— | 31 Mar 2026 |
| UBS Group AG |
13F
Company
|
—
class O/S missing
|
$298,676,529
5,233,512 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 08 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 24 reporting-owner rows connected to MPLX LP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
24
Largest Forms 3/4/5 holder
Frank M. Semple
Net 12M change
$0
Latest report
15 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Frank M. Semple | Director | $28,715,688 | Mixed | 15 May 2026 | ||
| Michael J. Hennigan | Executive Chairman, Director | $19,698,664 | Mixed | 12 Dec 2025 | ||
| Mannen Maryann T. | Chairman, President & CEO, Director | $9,798,481 | Mixed | 01 Mar 2026 | ||
| Garry L. Peiffer | Director | $6,615,533 | Mixed | 15 May 2026 | ||
| Gregory S. Floerke | Exec. VP and COO | $5,645,857 | Mixed | 01 Mar 2026 | ||
| Dan D. Sandman | Director | $4,669,330 | Mixed | 03 Apr 2023 | ||
| John J. Quaid | Director | $4,578,267 | Mixed | 01 Mar 2025 | ||
| John P. Surma | Director | $4,240,103 | Mixed | 15 May 2026 | ||
| Christopher A. Helms | Director | $3,860,262 | Mixed | 15 May 2026 | ||
| Donald C. Templin | Director | $3,644,080 | Mixed | 19 Nov 2021 | ||
| Molly R. Benson | Chief Legal Ofc & Corp Sec | $2,730,871 | Mixed | 01 Mar 2026 | ||
| J. Michael Stice | Director | $2,492,856 | Mixed | 15 May 2026 | ||
| Suzanne Gagle | General Counsel | $2,460,375 | Mixed | 01 Dec 2023 | ||
| Pamela K.m. Beall | Director | $1,949,372 | Mixed | 09 Dec 2021 | ||
| Shawn M. Lyon | Senior VP, Log. & Storage | $1,675,274 | Mixed | 01 Mar 2026 | ||
| Timothy J. Aydt | Exec. VP and Chief Comm Ofc. | $1,258,322 | Mixed | 01 Mar 2022 | ||
| Carl Kristopher Hagedorn | Exec VP & Chief Fin Ofc, Director | $1,208,620 | Mixed | 01 Mar 2026 | ||
| Thomas Kaczynski | Senior VP, Finance & Treasurer | $662,312 | Mixed | 02 Dec 2022 | ||
| Christine S. Breves | Director | $447,982 | Mixed | 15 May 2026 | ||
| Rebecca L. Iten | VP and Controller | $13,782 | Mixed | 03 Mar 2025 |
Recent insider transactions for MPLX LP
Showing up to 300 recent insider transactions from the last 12 months.
* marks a reported price that did not pass the local price check.