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Mplx LP (MPLX) · Insider trading

What Mplx's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
$0
bought less sold
Latest filing
2026-08-18
filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

2024-11: $188,960 sold 2025-01 2025-03: $211,000 bought 2025-07 2026-01 2026-07
Bought Sold Largest month: $211,000

Who traded, two years

InsiderBoughtSold TradesLast tradeHolds after
Lyon Shawn MSenior VP, Log. & Storage $211,000 – 1 2025-03-07 25,299
Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc – $188,960 1 2024-11-18 14,750

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

DateInsiderTradeShares PriceValueHolds afterFiling
2025-03-07 Lyon Shawn MSenior VP, Log. & Storage Buy 4,000 52.75 $211,000 25,299 Form 4
2024-11-18 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Sale 4,000 47.24 $188,960 14,750 Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

91 × grant or award43 × shares withheld for tax
Show them
DateInsiderWhatShares PriceHolds afterFiling
2026-08-14 Breves Christine SDirector Grant or award A +219 – 15,038 Form 4
2026-08-14 Helms Christopher ADirector Grant or award A +1,337 – 86,208 Form 4
2026-08-14 Semple Frank MDirector Grant or award A +1,073 – 63,476 Form 4
2026-08-14 Stice J MichaelDirector Grant or award A +983 – 58,413 Form 4
2026-08-14 Surma John PDirector Grant or award A +1,563 – 95,448 Form 4
2026-08-14 Walker Ray N JrDirector Grant or award A +82 – 4,609 Form 4
2026-08-14 Peiffer Garry L.Director Grant or award A +1,232 – 69,313 Form 4
2026-05-15 Breves Christine SDirector Grant or award A +277 – 14,361 Form 4
2026-05-15 Helms Christopher ADirector Grant or award A +1,415 – 84,413 Form 4
2026-05-15 Peiffer Garry L.Director Grant or award A +1,304 – 67,623 Form 4
2026-05-15 Semple Frank MDirector Grant or award A +1,194 – 61,946 Form 4
2026-05-15 Stice J MichaelDirector Grant or award A +1,098 – 56,973 Form 4
2026-05-15 Surma John PDirector Grant or award A +1,656 – 93,426 Form 4
2026-05-15 Walker Ray N JrDirector Grant or award A +78 – 4,069 Form 4
2026-04-30 Breves Christine SDirector Grant or award A +2,696 – 14,534 Form 4/A
2026-04-30 Helms Christopher ADirector Grant or award A +2,696 – 83,447 Form 4/A
2026-04-30 Peiffer Garry L.Director Grant or award A +2,696 – 66,769 Form 4/A
2026-04-30 Semple Frank MDirector Grant or award A +3,029 – 61,201 Form 4/A
2026-04-30 Stice J MichaelDirector Grant or award A +3,029 – 56,324 Form 4/A
2026-04-30 Surma John PDirector Grant or award A +3,029 – 92,219 Form 4/A
2026-04-30 Walker Ray N JrDirector Grant or award A +2,696 – 4,440 Form 4/A
2026-03-02 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −995 59.22 97,234 Form 4
2026-03-02 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −1,100 59.22 96,134 Form 4
2026-03-02 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −797 59.22 95,337 Form 4
2026-03-02 Mannen Maryann T.Director, Chairman, President & CEO Shares withheld for tax F −3,407 59.22 175,272 Form 4
2026-03-02 Mannen Maryann T.Director, Chairman, President & CEO Shares withheld for tax F −3,404 59.22 171,868 Form 4
2026-03-02 Mannen Maryann T.Director, Chairman, President & CEO Shares withheld for tax F −6,409 59.22 165,459 Form 4
2026-03-02 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −422 59.22 21,988 Form 4
2026-03-02 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −916 59.22 21,072 Form 4
2026-03-02 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −663 59.22 20,409 Form 4
2026-03-02 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −920 59.22 30,120 Form 4
2026-03-02 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −1,033 59.22 29,087 Form 4
2026-03-02 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −798 59.22 28,289 Form 4
2026-03-02 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −614 59.22 48,352 Form 4
2026-03-02 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −1,240 59.22 47,112 Form 4
2026-03-02 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −998 59.22 46,114 Form 4
2026-03-01 Floerke Gregory ScottExec. VP and COO Grant or award A +5,986 – 98,229 Form 4
2026-03-01 Mannen Maryann T.Director, Chairman, President & CEO Grant or award A +52,817 – 178,679 Form 4
2026-03-01 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Grant or award A +4,930 – 22,410 Form 4
2026-03-01 Lyon Shawn MSenior VP, Log. & Storage Grant or award A +5,986 – 31,040 Form 4
2026-03-01 Benson Molly RChief Legal Ofc & Corp Sec Grant or award A +8,803 – 48,966 Form 4
2026-03-01 Khoury Maria ADirector Grant or award A +8,451 – 8,451 Form 4
2026-02-17 Breves Christine SDirector Grant or award A +218 – 11,837 Form 4
2026-02-17 Helms Christopher ADirector Grant or award A +1,285 – 80,751 Form 4
2026-02-17 Peiffer Garry L.Director Grant or award A +1,181 – 64,072 Form 4
2026-02-17 Semple Frank MDirector Grant or award A +1,072 – 58,172 Form 4
2026-02-17 Stice J MichaelDirector Grant or award A +982 – 53,295 Form 4
2026-02-17 Surma John PDirector Grant or award A +1,505 – 89,190 Form 4
2026-02-17 Walker Ray N JrDirector Grant or award A +32 – 1,744 Form 4
2025-12-12 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −306 54.85 40,163 Form 4
2025-12-12 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −242 54.85 92,243 Form 4
2025-12-12 Hennigan Michael JDirector, Executive Chairman Shares withheld for tax F −1,335 54.85 359,137 Form 4
2025-12-12 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −245 54.85 25,054 Form 4
2025-11-14 Breves Christine SDirector Grant or award A +230 – 11,619 Form 4
2025-11-14 Helms Christopher ADirector Grant or award A +1,358 – 79,466 Form 4
2025-11-14 Peiffer Garry L.Director Grant or award A +1,247 – 62,892 Form 4
2025-11-14 Semple Frank MDirector Grant or award A +1,132 – 57,101 Form 4
2025-11-14 Stice J MichaelDirector Grant or award A +1,037 – 52,313 Form 4
2025-11-14 Surma John PDirector Grant or award A +1,590 – 87,685 Form 4
2025-11-14 Walker Ray N JrDirector Grant or award A +34 – 1,712 Form 4
2025-08-25 Walker Ray N JrDirector Grant or award A +1,678 – 1,678 Form 4
2025-08-15 Helms Christopher ADirector Grant or award A +1,260 – 78,108 Form 4
2025-08-15 Surma John PDirector Grant or award A +1,475 – 86,095 Form 4
2025-08-15 Semple Frank MDirector Grant or award A +1,051 – 55,968 Form 4
2025-08-15 Stice J MichaelDirector Grant or award A +962 – 51,276 Form 4
2025-08-15 Peiffer Garry L.Director Grant or award A +1,157 – 61,645 Form 4
2025-08-15 Breves Christine SDirector Grant or award A +214 – 11,389 Form 4
2025-05-16 Breves Christine SDirector Grant or award A +201 – 11,175 Form 4
2025-05-16 Helms Christopher ADirector Grant or award A +1,187 – 76,849 Form 4
2025-05-16 Peiffer Garry L.Director Grant or award A +1,090 – 60,488 Form 4
2025-05-16 Semple Frank MDirector Grant or award A +990 – 54,918 Form 4
2025-05-16 Stice J MichaelDirector Grant or award A +907 – 50,313 Form 4
2025-05-16 Surma John PDirector Grant or award A +1,390 – 84,620 Form 4
2025-05-01 Breves Christine SDirector Grant or award A +2,481 – 10,974 Form 4
2025-05-01 Helms Christopher ADirector Grant or award A +2,481 – 75,661 Form 4
2025-05-01 Peiffer Garry L.Director Grant or award A +2,481 – 59,397 Form 4
2025-05-01 Semple Frank MDirector Grant or award A +2,848 – 53,928 Form 4
2025-05-01 Stice J MichaelDirector Grant or award A +2,848 – 49,406 Form 4
2025-05-01 Surma John PDirector Grant or award A +2,848 – 83,229 Form 4
2025-04-01 Breves Christine SDirector Grant or award A +192 – 8,493 Form 4
2025-04-01 Helms Christopher ADirector Grant or award A +192 – 73,180 Form 4
2025-04-01 Peiffer Garry L.Director Grant or award A +192 – 56,916 Form 4
2025-04-01 Stice J MichaelDirector Grant or award A +220 – 46,558 Form 4
2025-04-01 Semple Frank MDirector Grant or award A +220 – 51,079 Form 4
2025-04-01 Surma John PDirector Grant or award A +220 – 80,381 Form 4
2025-03-03 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −580 54.34 42,356 Form 4
2025-03-03 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −625 54.34 41,731 Form 4
2025-03-03 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −1,262 54.34 40,469 Form 4
2025-03-03 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −1,054 54.34 94,580 Form 4
2025-03-03 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −995 54.34 93,585 Form 4
2025-03-03 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −1,100 54.34 92,485 Form 4
2025-03-03 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −448 54.34 18,812 Form 4
2025-03-03 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −422 54.34 18,390 Form 4
2025-03-03 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Shares withheld for tax F −910 54.34 17,480 Form 4
2025-03-03 Hennigan Michael JDirector, Executive Chairman Shares withheld for tax F −9,862 54.34 380,764 Form 4
2025-03-03 Hennigan Michael JDirector, Executive Chairman Shares withheld for tax F −10,181 54.34 370,583 Form 4
2025-03-03 Hennigan Michael JDirector, Executive Chairman Shares withheld for tax F −10,111 54.34 360,472 Form 4
2025-03-03 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −936 54.34 22,351 Form 4
2025-03-03 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −1,052 54.34 21,299 Form 4
2025-03-03 Mannen Maryann T.Director, President & CEO Shares withheld for tax F −3,290 54.34 132,673 Form 4
2025-03-03 Mannen Maryann T.Director, President & CEO Shares withheld for tax F −3,407 54.34 129,266 Form 4
2025-03-03 Mannen Maryann T.Director, President & CEO Shares withheld for tax F −3,404 54.34 125,862 Form 4
2025-03-03 Quaid John JDirector Shares withheld for tax F −1,267 54.34 56,052 Form 4
2025-03-03 Quaid John JDirector Shares withheld for tax F −1,280 54.34 54,772 Form 4
2025-03-03 Quaid John JDirector Shares withheld for tax F −2,379 54.34 52,393 Form 4
2025-03-01 Benson Molly RChief Legal Ofc & Corp Sec Grant or award A +7,517 – 42,936 Form 4
2025-03-01 Floerke Gregory ScottExec. VP and COO Grant or award A +6,014 – 95,634 Form 4
2025-03-01 Hagedorn Carl KristopherDirector, Exec VP & Chief Fin Ofc Grant or award A +4,510 – 19,260 Form 4
2025-03-01 Hennigan Michael JDirector, Executive Chairman Grant or award A +33,377 – 390,626 Form 4
2025-03-01 Lyon Shawn MSenior VP, Log. & Storage Grant or award A +6,014 – 23,287 Form 4
2025-03-01 Mannen Maryann T.Director, President & CEO Grant or award A +48,863 – 135,963 Form 4
2025-03-01 Quaid John JDirector Grant or award A +12,780 – 57,319 Form 4
2025-02-14 Breves Christine SDirector Grant or award A +145 – 8,301 Form 4
2025-02-14 Helms Christopher ADirector Grant or award A +1,082 – 72,988 Form 4
2025-02-14 Peiffer Garry L.Director Grant or award A +990 – 56,724 Form 4
2025-02-14 Semple Frank MDirector Grant or award A +888 – 50,859 Form 4
2025-02-14 Stice J MichaelDirector Grant or award A +809 – 46,337 Form 4
2025-02-14 Surma John PDirector Grant or award A +1,269 – 80,161 Form 4
2025-01-02 Breves Christine SDirector Grant or award A +642 – 8,156 Form 4
2025-01-02 Helms Christopher ADirector Grant or award A +642 – 71,906 Form 4
2025-01-02 Peiffer Garry L.Director Grant or award A +642 – 55,734 Form 4
2025-01-02 Semple Frank MDirector Grant or award A +738 – 49,971 Form 4
2025-01-02 Stice J MichaelDirector Grant or award A +738 – 45,528 Form 4
2025-01-02 Surma John PDirector Grant or award A +738 – 78,892 Form 4
2024-12-13 Benson Molly RChief Legal Ofc & Corp Sec Shares withheld for tax F −381 48.86 35,419 Form 4
2024-12-13 Floerke Gregory ScottExec. VP and COO Shares withheld for tax F −333 48.86 89,620 Form 4
2024-12-13 Hennigan Michael JDirector, Executive Chairman Shares withheld for tax F −3,071 48.86 357,249 Form 4
2024-12-13 Lyon Shawn MSenior VP, Log. & Storage Shares withheld for tax F −317 48.86 17,273 Form 4
2024-11-15 Breves Christine SDirector Grant or award A +150 – 7,513 Form 4
2024-11-15 Helms Christopher ADirector Grant or award A +1,201 – 71,264 Form 4
2024-11-15 Peiffer Garry L.Director Grant or award A +1,098 – 55,091 Form 4
2024-11-15 Semple Frank MDirector Grant or award A +982 – 49,233 Form 4
2024-11-15 Stice J MichaelDirector Grant or award A +893 – 44,791 Form 4
2024-11-15 Surma John PDirector Grant or award A +1,409 – 78,155 Form 4

How to read it

Buy, sale
Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan
A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after
The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value
Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

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