Transactions
9
Insider / Marathon Petroleum Corp
Lyon Shawn M
SVP Log & Storage, MPLX GP LLC at Marathon Petroleum Corp
- Company
- Marathon Petroleum Corp
- Ticker
- MPC
- First filing on record
- December 16, 2025
- Latest trade on record
- August 31, 2026
- SEC filings
- EDGAR ↗
Lyon Shawn M, SVP Log & Storage, MPLX GP LLC at Marathon Petroleum Corp, has disclosed 9 transactions in MPC since December 16, 2025: 0 purchases (0 open-market buys) and 7 sales, worth about $1.6M at the reported prices. The latest was filed September 1, 2026, 1 day after the trade.
Open-market buys
0
Sales
7
Avg. disclosure lag
2.2d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Lyon Shawn M made no purchases and 7 sales worth $1.6M, plus 2 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Lyon Shawn M has traded 1 stock on record; the largest by dollars is MPC.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
0 of 5 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| F | Shares withheld for tax | 4 | 859 | $175K |
| S | Open-market sale | 3 | 3,925 | $1.4M |
| A | Grant or award | 1 | 1,730 | — |
| G | Gift | 1 | 1,186 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 8 | 0 | 6 · $1.6M |
| 2025 | 1 | 0 | 1 · $16K |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| MPC | Sell S | August 31, 2026 | September 1, 2026 | 1d | 1,000 | $376 | $376K | Form 4 ↗ | ||
| MPC | Sell S | August 28, 2026 | September 1, 2026 | 4d | 425 | $369 | $157K | Form 4 ↗ | ||
| MPC | Sell S | August 13, 2026 | August 17, 2026 | 4d | 2,500 | $350 | $875K | Form 4 ↗ | ||
| MPC | Other G | March 11, 2026 | March 13, 2026 | 2d | 1,186 | — | — | Form 4 ↗ | ||
| MPC | Sell F | March 2, 2026 | March 3, 2026 | 1d | 279 | $206 | $58K | Form 4 ↗ | ||
| MPC | Sell F | March 2, 2026 | March 3, 2026 | 1d | 237 | $206 | $49K | Form 4 ↗ | ||
| MPC | Sell F | March 2, 2026 | March 3, 2026 | 1d | 257 | $206 | $53K | Form 4 ↗ | ||
| MPC | Other A | March 1, 2026 | March 3, 2026 | 2d | 1,730 | — | — | Form 4 ↗ | ||
| MPC | Sell F | December 12, 2025 | December 16, 2025 | 4d | 86 | $186 | $16K | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| September 1, 2026 | Form 4 | 0001193125-26-378519 | 2 | published | EDGAR ↗ |
| August 17, 2026 | Form 4 | 0001193125-26-354289 | 1 | published | EDGAR ↗ |
| March 13, 2026 | Form 4 | 0001193125-26-105534 | 1 | published | EDGAR ↗ |
| March 3, 2026 | Form 4 | 0001948454-26-000003 | 4 | published | EDGAR ↗ |
| December 16, 2025 | Form 4 | 0001193125-25-320726 | 1 | published | EDGAR ↗ |
Other insiders at Marathon Petroleum Corp
- Benson Molly R Chief Legal Ofc & Corp Sec 14 rows
- Henschen Michael A II Ex VP, Refining 12 rows
- Hessling Ricky D. Chief Commercial Officer 12 rows
- Mannen Maryann T. Chairman, President & CEO 8 rows
- Brzezinski Erin M VP and Controller 5 rows
- Floerke Gregory Scott Ex VP & COO, MPLX GP LLC 5 rows
- Rucker Kim K.W. Director 5 rows
- Bayh Evan Director 4 rows
- SURMA JOHN P Director 4 rows
- COHEN JONATHAN Z Director 3 rows
Everyone on file, with contracts and lobbying under the company's name: Marathon Petroleum Corp.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 5 | 9 | December 16, 2025 | September 1, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.