Every Form 4 that MPLX LP PFD CL A (MPLXP) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow MPLXP and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full MPLXP filings page.
MPLX LP (symbol MPLX) reports that a director received an equity award of 1,232.166 Common Units (Limited Partner Interests) on August 14, 2026. The units were acquired as a grant or award at a stated price of $0.0000 per unit, reflecting non-cash compensation.
After this award, the director holds 69,313.2300 MPLX common units directly. In addition, 68,497.0000 units are held indirectly through a revocable trust identified as the Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026.
MPLX LP (MPLX) reported an insider equity award for director Walker Ray N Jr. He received a grant of 81.939 Common Units (Limited Partner Interests) on 2026-08-14 at a stated price of $0.0000 per unit, increasing his directly held units to 4,609.294 following the transaction. The award is characterized as a grant or other acquisition rather than an open-market purchase, and the Rule 10b5-1 plan checkbox was not selected.
MPLX LP (MPLX) reported that a director received a grant of common units representing limited partner interests. On 2026-08-14, the reporting person acquired 1,563.4270 common units in a grant or award transaction at a stated price of $0.0000 per unit, bringing the director’s directly held position to 95,447.7770 units.
MPLX LP (MPLX) reported that director J. Michael Stice received a grant of 982.715 Common Units (Limited Partner Interests) on 2026-08-14 at a stated price of $0.0000 per unit, described as a grant/award acquisition. Following this grant, he holds 58,412.913 units directly and 700 units indirectly through The Mike Stice Trust.
MPLX LP (symbol: MPLX) is the issuer of record for a Form 4 filing submitted to the SEC.
MPLX LP (symbol: MPLX) is the issuer of record for a Form 4 filing submitted to the SEC.
MPLX LP (MPLX) reported that a director received an additional equity award in the form of common units. Reporting person Christine S. Breves acquired 218.82 common units of limited partner interests at a stated price of $0.00 per unit, increasing her direct holdings to 15,038.282 units.
Walker Ray N JR reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP reported that director Ray N. Walker Jr. received a grant of 2,696.387 Common Units (limited partner interests) as his annual 2026 equity retainer award on April 30, 2026. The amended report corrects this award amount and shows he beneficially owned 4,440.086 units directly after the grant as of that date, excluding any later transactions.
SURMA JOHN P reported acquisition or exercise transactions in this Form 4 filing.
John P. Surma, a director associated with MPLX LP, received a grant of 3,028.941 Common Units (Limited Partner Interests) on April 30, 2026 as his annual 2026 equity retainer award, at a stated price of $0.0000 per unit.
This amendment corrects the previously reported amount of the 2026 equity retainer grant and states that Surma beneficially owned 92,219.200 common units directly following the award as of April 30, 2026; this balance excludes any transactions after that date.
STICE J MICHAEL reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director J Michael Stice received 3028.9410 Common Units of limited partner interests on April 30, 2026 as his annual 2026 equity retainer award at a stated price of 0.0000 per unit. After this grant, he beneficially owned 56324.0950 Common Units as of that date. The amendment corrects the originally reported award size and holdings balance and indicates the transaction was not made under a Rule 10b5-1 trading plan.
SEMPLE FRANK M reported acquisition or exercise transactions in this Form 4 filing.
Frank M. Semple, a director of MPLX GP LLC, received an annual 2026 equity retainer award of 3,028.941 Common Units of MPLX LP on April 30, 2026. After this grant, he beneficially owned 61,201.275 Common Units, all held directly.
The amended report corrects the size of the 2026 equity retainer and the resulting beneficial ownership balance as of April 30, 2026; it does not reflect any transactions after that date.
Peiffer Garry L. reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Garry L. Peiffer received an annual 2026 equity retainer award of 2,696.3870 common units of limited partner interests on April 30, 2026, at a grant price of $0.0000 per unit. Following this award, he beneficially owned 66,768.7300 common units as of that date. This amendment corrects the amount of the 2026 equity retainer award and the reported holdings.
HELMS CHRISTOPHER A reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christopher A. Helms received a grant of 2,696.387 Common Units (limited partner interests) as his annual 2026 equity retainer award on April 30, 2026. This amendment corrects the award amount and reports 83,447.484 common units beneficially owned as of that date, excluding any later transactions.
Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christine S. Breves received a grant of 2,696.387 Common Units (Limited Partner Interests) on April 30, 2026 as her annual 2026 equity retainer award. Following this grant, she beneficially owned 14,533.844 Common Units as of that date. This amended report corrects the previously reported award amount.
Walker Ray N JR reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Ray N. Walker Jr. received a grant of 78.436 Common Units (Limited Partner Interests) on May 15, 2026 as a non-cash award. Following this grant, his directly held position increased to 4,069.124 common units, reflecting routine equity-based compensation rather than an open-market purchase.
SURMA JOHN P reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director John P. Surma received a grant of 1,656.317 Common Units (limited partner interests) on May 15, 2026. The units were awarded at a reported price of $0.00 per unit as compensation, increasing his direct holdings to 93,426.119 units.
MPLX LP director J. Michael Stice reported an equity award of 1,098.213 common units. The units were acquired at a reported price of $0.00 per unit as a grant or award, bringing his directly held common units to 56,972.910. He also reports indirect ownership of 700 common units through The Mike Stice Trust.
MPLX LP director Frank M. Semple reported a grant of 1,194.074 Common Units (Limited Partner Interests) on May 15, 2026. The units were acquired at a stated price of $0.00 per unit as a grant or award, indicating compensation rather than an open-market purchase.
After this transaction, Semple directly holds 61,945.951 MPLX common units. He also has indirect interests in additional MPLX units held through entities, including EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust, each with reported unit balances as of the same date.
Peiffer Garry L. reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Garry L. Peiffer reported receiving additional common units as equity compensation and updated his holdings. He was granted 1,303.501 common units of MPLX LP at no cost, bringing his directly held units to 67,622.833. He also reported indirect ownership of 68,497 common units held by the Garry L. Peiffer Revocable Trust.
HELMS CHRISTOPHER A reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christopher A. Helms received a grant of 1,415.117 Common Units (Limited Partner Interests) on May 15, 2026 at a stated price of $0.00 per unit. After this award, he directly holds a total of 84,413.203 common units.
Walker Ray N JR reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Walker Ray N. Jr. received an equity grant of 2,246.989 Common Units (limited partner interests) of MPLX LP on April 30, 2026. The units were awarded at a stated price of $0.00 per unit as his annual 2026 equity retainer award. After this grant, he holds a total of 3,990.688 common units directly.
SURMA JOHN P reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director John P. Surma received an equity grant of 2,579.543 Common Units (limited partner interests) as his annual 2026 equity retainer award. The award was recorded at a price of $0.00 per unit, indicating it was compensation rather than a market purchase.
Following this grant, Surma directly holds a total of 91,769.802 MPLX Common Units. This filing reflects routine board compensation and does not show any open-market buying or selling activity.
STICE J MICHAEL reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director J. Michael Stice received an equity grant of 2,579.543 Common Units (Limited Partner Interests) on an award valued at $0.0000 per unit. This represents his annual 2026 equity retainer award. Following the grant, he directly holds 55,874.697 common units and indirectly holds 700 common units through The Mike Stice Trust.
SEMPLE FRANK M reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Frank M. Semple reported an equity award and updated holdings in common units. He received 2,579.543 common units as his annual 2026 equity retainer award at a stated price of $0.00 per unit, increasing his direct holdings to 60,751.877 units. The filing also lists indirect ownership of MPLX common units through EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust.
Peiffer Garry L. reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Garry L. Peiffer received an equity compensation award of 2,246.989 common units of MPLX LP on April 30, 2026. The award was granted at $0.00 per unit as his annual 2026 equity retainer, so it was not an open-market purchase.
After this grant, Peiffer directly holds 66,319.332 common units. Separately, 68,497 common units are reported as indirectly held through the Garry L. Peiffer Revocable Trust.
HELMS CHRISTOPHER A reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christopher A. Helms received an equity grant of 2,246.989 common units as part of his annual 2026 equity retainer award. The grant was reported at a price of $0.00 per unit, reflecting a compensation award rather than a market purchase. Following this award, Helms directly holds a total of 82,998.086 MPLX common units.
Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christine S. Breves received an equity grant of 2,246.989 common units (limited partner interests) as her annual 2026 equity retainer award. The grant was reported at a price of $0.00 per unit, indicating it is compensation rather than an open-market purchase. Following this award, she directly holds a total of 14,084.446 MPLX common units.
MPLX LP Senior VP of Logistics & Storage Shawn M. Lyon reported equity compensation and related tax transactions in common units. On March 1, 2026, he acquired 5,986 common units as a grant at $0.00 per unit. On March 2, 2026, he had three F-code tax-withholding dispositions of 920, 1,033, and 798 common units at $59.22 per unit to satisfy tax obligations by delivering units. After these transactions, he directly held 28,289 common units of MPLX LP.
MPLX LP executive vice president and chief financial officer Carl Kristopher Hagedorn reported both an equity award and related tax-withholding transactions in common units. On March 1, 2026, he acquired 4,930 common units as a grant at $0.00 per unit. On March 2, 2026, he disposed of 422, 916, and 663 common units at $59.22 per unit in tax-withholding dispositions. Following these transactions, his direct holdings were reported at 20,409 common units.
MPLX LP executive vice president and COO Gregory Scott Floerke received a grant of 5,986 common units of limited partner interests on March 1, 2026 at a stated price of $59.22 per unit. On March 2, 2026, three tax-withholding dispositions totaling 995, 1,100 and 797 units reduced his directly owned units to 95,337.
MPLX LP director Ray N. Walker Jr. reported an equity award of 32.127 common units of limited partner interests on February 17, 2026. The units were granted at a price of $0.00 per unit as a grant/award acquisition, not an open-market purchase. After this award, his directly held stake increased to 1,743.699 common units.
MPLX LP director John P. Surma received an award of 1,505.132 common units on February 17, 2026. The units, representing limited partner interests, were acquired as a grant at a stated price of $0.0000 per unit. After this award, his directly held units total 89,190.259.
MPLX LP director J. Michael Stice received an equity grant of common units. He was awarded 981.957 common units (limited partner interests) of MPLX LP on February 17, 2026, recorded as a grant or other acquisition with no cash price shown per unit.
After this grant, Stice directly holds 53,295.154 common units. In addition, 700 common units are held indirectly through The Mike Stice Trust, reflecting a separate indirect ownership position rather than a new transaction.
MPLX LP director Frank M. Semple reported an equity award of common units. On February 17, 2026, he acquired 1,071.818 common units of MPLX LP as a grant, bringing his directly held units to 58,172.334. Additional common units are reported as indirectly held through several trusts and an LLC.
MPLX LP director Garry L. Peiffer reported an acquisition of common units through an equity award. On February 17, 2026, he received 1,180.524 Common Units (Limited Partner Interests) at a price of $0.0000 per unit, described as a grant or award acquisition.
Following this transaction, Peiffer directly owned 64,072.343 common units. In addition, a revocable trust identified as the Garry L. Peiffer Revocable Trust held an indirect position of 68,497.000 common units, reflecting his beneficial ownership through that trust.
HELMS CHRISTOPHER A reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christopher A. Helms received an equity grant of 1,285.155 common units of limited partner interests. The award was recorded at a price of $0.0000 per unit, indicating it was a grant rather than an open-market purchase. Following this transaction, Helms directly holds a total of 80,751.097 common units.
Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christine S. Breves received an award of 218.103 Common Units (Limited Partner Interests) on February 17, 2026. The award was recorded at a price of $0.0000 per unit, indicating it was a grant rather than an open-market purchase. Following this grant, her directly owned holdings increased to 11,837.457 common units.
MPLX LP reported that director Ray N. Walker Jr. acquired additional equity in the partnership. On 11/14/2025, he acquired 1,711.572 common units (limited partner interests) at a reported price of $0 per unit, as shown in Table I of the Form 4. Following this transaction, he beneficially owns 1,711.572 common units in a direct capacity. The filing notes that he is a director of MPLX GP LLC, the general partner that manages the issuer.
MPLX LP reported an insider transaction on a Form 4 involving one director. On 11/14/2025, the reporting person acquired 1,590.069 Common Units (Limited Partner Interests) in MPLX. The units were reported at a price of $0, indicating they were not purchased for cash in the open market. Following this transaction, the director beneficially owns 87,685.127 MPLX common units, held directly. The filer is a director of MPLX GP LLC, the general partner that manages the issuer.
MPLX LP (MPLX) reported an insider equity transaction by a director on Form 4. On 11/14/2025, the reporting person acquired 1,037.37 MPLX common units (limited partner interests) in a transaction reported with a price of $0 per unit, indicating a grant or similar award rather than an open-market purchase. Following this transaction, the reporting person beneficially owns 52,313.197 MPLX common units directly and 700 MPLX common units indirectly through The Mike Stice Trust. The reporting person serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP (MPLX) director Frank M. Semple reported acquiring 1,132.302 common units on 11/14/2025, according to a Form 4 insider filing. The units were acquired at a reported price of $0, indicating an award or similar non-cash grant rather than an open-market purchase. Following this transaction, Semple directly holds 57,100.516 MPLX common units. He also reports additional indirect holdings of 333,337 units through the Frank M Semple Revocable Trust, 111,180 units through the Robin Y Semple 2012 Dynasty Trust, and 48,777 units through EK Holdings LLC. Semple serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP director Garry L. Peiffer reported acquiring additional common units of the master limited partnership. On 11/14/2025, he acquired 1,247.144 MPLX common units (limited partner interests) at a reported price of $0, suggesting these were likely granted rather than purchased in the open market. Following this transaction, he beneficially owns 62,891.819 common units in a direct capacity and an additional 68,497 common units indirectly through the Garry L. Peiffer Revocable Trust. The filing confirms this is an individual Form 4 for one reporting person in his capacity as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP reported an insider transaction on Form 4 involving director Christopher A. Helms. On 11/14/2025, Helms acquired 1,357.679 MPLX common units (limited partner interests) at a reported price of $0 per unit, increasing his direct holdings. Following this transaction, he beneficially owned 79,465.942 common units directly. MPLX is managed by the directors and executive officers of MPLX GP LLC, where Helms serves as a director.
MPLX LP disclosed that one of its directors acquired additional equity in the company. On 11/14/2025, the reporting person received 230.413 MPLX common units (limited partner interests) in an acquisition transaction reported at a price of $0 per unit, which suggests a grant rather than an open-market purchase. After this transaction, the director beneficially owns 11,619.354 MPLX common units, held directly. The director serves on the board of MPLX GP LLC, which is the general partner that manages MPLX LP through its directors and executive officers.