Bank of America Corp
· Reduced
Change
−6.0M
Date
Q1 2026
MP
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Bank of America Corp
· Reduced
Change
−6.0M
Date
Q1 2026
|
Bank of America Corp | Reduced· Q1 2026 | – | −6.0M | – | Q1 2026 | |||||
|
Brave Warrior Advisors, LLC
· Reduced
Change
−1.2M
Date
Q1 2026
|
Brave Warrior Advisors, LLC | Reduced· Q1 2026 | – | −1.2M | – | Q1 2026 | |||||
|
ING Groep NV
· Reduced
Change
−1.1M
Date
Q1 2026
|
ING Groep NV | Reduced· Q1 2026 | – | −1.1M | – | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−799K
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −799K | – | Q1 2026 | |||||
|
Brookfield Corp
· Reduced
Change
−786K
Date
Q1 2026
|
Brookfield Corp | Reduced· Q1 2026 | – | −786K | – | Q1 2026 | |||||
|
Kayne Anderson Capital Advisors LP
· Reduced
Change
−401K
Date
Q1 2026
|
Kayne Anderson Capital Advisors LP | Reduced· Q1 2026 | – | −401K | – | Q1 2026 | |||||
|
Blackstone Inc.
· Reduced
Change
−355K
Date
Q1 2026
|
Blackstone Inc. | Reduced· Q1 2026 | – | −355K | – | Q1 2026 | |||||
|
Hrt Financial LP
· Reduced
Change
−266K
Date
Q1 2026
|
Hrt Financial LP | Reduced· Q1 2026 | – | −266K | – | Q1 2026 | |||||
|
Citigroup Inc
· Reduced
Change
−242K
Date
Q1 2026
|
Citigroup Inc | Reduced· Q1 2026 | – | −242K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
Change
−231K
Δ Own
−97.8%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | – | −231K | −97.8% | Q1 2026 | |||||
|
Northside Capital Management, LLC
· Reduced
Change
−228K
Date
Q1 2026
|
Northside Capital Management, LLC | Reduced· Q1 2026 | – | −228K | – | Q1 2026 | |||||
|
Chickasaw Capital Management LLC
· Reduced
Change
−207K
Date
Q1 2026
|
Chickasaw Capital Management LLC | Reduced· Q1 2026 | – | −207K | – | Q1 2026 | |||||
|
Longfellow Investment Management Co LLC
· Reduced
Change
−187K
Date
Q1 2026
|
Longfellow Investment Management Co LLC | Reduced· Q1 2026 | – | −187K | – | Q1 2026 | |||||
|
Duff & Phelps Investment Management Co
· Reduced
Change
−164K
Date
Q1 2026
|
Duff & Phelps Investment Management Co | Reduced· Q1 2026 | – | −164K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Exited
Change
−156K
Δ Own
−100.0%
Date
Q1 2026
|
Jane Street Group, LLC | Exited· Q1 2026 | – | −156K | −100.0% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Walker Ray N. Jr
· Director
Grant (A)
78
|
Walker Ray N. Jr | Director | Grant (A) | – | 78 | – | 4K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Surma John P.
· Director
Grant (A)
2K
|
Surma John P. | Director | Grant (A) | – | 2K | – | 93K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Stice J. Michael
· Director
Grant (A)
1K
|
Stice J. Michael | Director | Grant (A) | – | 1K | – | 57K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Semple Frank M.
· Director
Grant (A)
1K
|
Semple Frank M. | Director | Grant (A) | – | 1K | – | 62K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Peiffer Garry L.
· Director
Grant (A)
1K
|
Peiffer Garry L. | Director | Grant (A) | – | 1K | – | 68K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Helms Christopher A.
· Director
Grant (A)
1K
|
Helms Christopher A. | Director | Grant (A) | – | 1K | – | 84K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Breves Christine S.
· Director
Grant (A)
277
|
Breves Christine S. | Director | Grant (A) | – | 277 | – | 14K | – | May 15, 2026 | May 19, 2026 | |||||||||
|
Walker Ray N. Jr
· Director
Grant (A)
2K
|
Walker Ray N. Jr | Director | Grant (A) | – | 2K | – | 4K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Surma John P.
· Director
Grant (A)
3K
|
Surma John P. | Director | Grant (A) | – | 3K | – | 92K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Stice J. Michael
· Director
Grant (A)
3K
|
Stice J. Michael | Director | Grant (A) | – | 3K | – | 56K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Semple Frank M.
· Director
Grant (A)
3K
|
Semple Frank M. | Director | Grant (A) | – | 3K | – | 61K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Peiffer Garry L.
· Director
Grant (A)
2K
|
Peiffer Garry L. | Director | Grant (A) | – | 2K | – | 66K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Helms Christopher A.
· Director
Grant (A)
2K
|
Helms Christopher A. | Director | Grant (A) | – | 2K | – | 83K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Breves Christine S.
· Director
Grant (A)
2K
|
Breves Christine S. | Director | Grant (A) | – | 2K | – | 14K | – | Apr 30, 2026 | May 4, 2026 | |||||||||
|
Mannen Maryann T.
· Director, Officer
3 operations
-$783K
|
Mannen Maryann T. | Director, Officer | 3 operations | $59.22 | -13K | -$783K | 165K | – | Mar 2, 2026 | Mar 3, 2026 | |||||||||
N
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517 reporting institutions disclosed MPLX position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.