Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| MPLX LPMPLX · Entity 3003 | Director | August 14, 2026 | August 18, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
MPLX LP
Report date August 14, 2026 · Filed August 18, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common Units (Limited Partner Interests)SEC Table I · non-derivative | Direct | 69,313.23 |
Reported balance
After 2026-08-14 transaction · row 1
1 source rowRow 1 · 2026-08-14 · Grant · Acquired 1,232.166 · Balance 69,313.23 |
| Common Units (Limited Partner Interests)SEC Table I · non-derivative | IndirectBy Revocable Trust | 68,497 |
Reported balance
Holding disclosure · report date 2026-08-14 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 68,497 F1: By Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026. |
Filing footnotes · ownership attribution and instrument terms
F1: By Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| February 14, 2020 Filed Feb 18, 2020 18:44 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 490.94 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-20-009926 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 17,643.471 Read SEC document |
| January 02, 2020 Filed Jan 6, 2020 15:28 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 1,061.776 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-20-001530 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 17,152.531 Read SEC document |
| November 14, 2019 Filed Nov 18, 2019 12:54 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 452.39 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-056848 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 16,090.755 Read SEC document |
| October 01, 2019 Filed Oct 3, 2019 20:48 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 975.523 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-052292 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 15,638.365 Read SEC document |
| August 14, 2019 Filed Aug 15, 2019 20:03 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 360.529 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-046092 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 14,662.842 Read SEC document |
| August 09, 2019 Filed Aug 13, 2019 12:26 UTC | MPLX LP MPLX · Entity 3003 | PurchaseCommon Units (Limited Partner Interests) | 18,800 | $27.30 | $513,258.80 |
DisclosureSEC source: 0001209191-19-045682 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Indirect · By Revocable Trust Disclosed balance after: 68,497 F1 · price: The price reported in Column 4 is a weighted average price. These units were purchased in multiple transactions at prices ranging from $27.265 to $27.31, inclusive. The Reporting Person undertakes to provide to MPLX LP, any security holder of MPLX LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units purchased at each separate price within the range set forth in footnote (1) to this Form 4. F2 · ownership.nature: By Garry L. Peiffer Revocable Trust. Read SEC document |
| August 07, 2019 Filed Aug 9, 2019 15:55 UTC | MPLX LP MPLX · Entity 3003 | PurchaseCommon Units (Limited Partner Interests) | 18,000 | $27.15 | $488,646.00 |
DisclosureSEC source: 0001209191-19-045284 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Indirect · By Revocable Trust Disclosed balance after: 49,697 F1 · price: The price reported in Column 4 is a weighted average price. These units were purchased in multiple transactions at prices ranging from $27.125 to $27.16, inclusive. The Reporting Person undertakes to provide to MPLX LP, any security holder of MPLX LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units purchased at each separate price within the range set forth in footnote (1) to this Form 4. F2 · ownership.nature: By Garry L. Peiffer Revocable Trust. Read SEC document |
| July 01, 2019 Filed Jul 3, 2019 17:19 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 852.449 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-040763 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 14,302.313 Read SEC document |
| May 15, 2019 Filed May 17, 2019 11:54 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 275.857 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-030678 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,449.864 Read SEC document |
| April 01, 2019 Filed Apr 3, 2019 23:23 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 827.565 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-023495 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,174.007 Read SEC document |
| February 14, 2019 Filed Feb 19, 2019 12:56 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 229.212 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-010859 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 12,346.442 Read SEC document |
| January 02, 2019 Filed Jan 4, 2019 23:59 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 895.474 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-19-002300 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 12,117.23 Read SEC document |
| November 14, 2018 Filed Nov 16, 2018 20:37 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 218.991 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-058909 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 11,221.756 Read SEC document |
| October 01, 2018 Filed Oct 3, 2018 10:46 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 619.513 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-053546 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 11,002.765 Read SEC document |
| August 14, 2018 Filed Aug 16, 2018 12:31 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 169.641 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-046922 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 10,383.252 Read SEC document |
| July 02, 2018 Filed Jul 5, 2018 16:01 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 645.471 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-041429 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 10,213.611 Read SEC document |
| May 15, 2018 Filed May 17, 2018 11:35 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 165.929 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-030740 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,568.14 Read SEC document |
| April 02, 2018 Filed Apr 4, 2018 18:17 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 669.78 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-023509 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,402.211 Read SEC document |
| February 14, 2018 Filed Feb 16, 2018 13:00 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 143.155 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-010603 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,732.431 Read SEC document |
| January 02, 2018 Filed Jan 4, 2018 13:21 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 606.964 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-18-001604 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,589.276 Read SEC document |
| November 14, 2017 Filed Nov 16, 2017 14:07 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 136.693 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-061055 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,982.312 Read SEC document |
| October 02, 2017 Filed Oct 4, 2017 14:25 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 617.066 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-055566 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,845.619 Read SEC document |
| August 14, 2017 Filed Aug 16, 2017 12:07 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 119.021 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-049098 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,228.553 Read SEC document |
| July 03, 2017 Filed Jul 5, 2017 17:50 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 638.873 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-043053 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,109.532 Read SEC document |
| May 15, 2017 Filed May 17, 2017 17:05 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 96.046 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-032984 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,470.659 Read SEC document |
| April 03, 2017 Filed Apr 5, 2017 14:36 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 600.302 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-025478 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,374.613 Read SEC document |
| February 14, 2017 Filed Feb 16, 2017 19:32 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 76.345 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-011375 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,774.311 Read SEC document |
| January 03, 2017 Filed Jan 5, 2017 19:03 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 621.449 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-17-001802 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,697.966 Read SEC document |
| November 14, 2016 Filed Nov 16, 2016 14:13 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 79.14 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-16-150365 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,076.517 Read SEC document |
| October 03, 2016 Filed Oct 5, 2016 20:20 UTC | MPLX LP MPLX · Entity 3003 | GrantCommon Units (Limited Partner Interests) | 573.394 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-16-144930 · doc4.xml · nonDerivative · entry 1 Peiffer Garry L. · CIK 0001521094 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 4,997.377 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.