Latest filingSep 01, 2026Most recent Form 4
MPC
Marathon Petroleum Corp
NYSEIndustrialsPetroleum Refining
Insider activity for last month from 08/03 to 09/03. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$598M6 sells
Net open-market-$598M3 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period11transactions
- S · Open-market sells · dominant6 · 55%
- M · Option exercise5 · 45%
Activity by reported role
A joint filing can contribute to multiple roles22transactions
- CLO · dominant7 · 32%
- CS7 · 32%
- MGL3 · 14%
- SL3 · 14%
- CTRL1 · 5%
- VP1 · 5%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeBenson Molly RCommon Stock · Direct
30,334.3328Aug 17, 2026
Lyon Shawn MCommon Stock · Direct
11,194Aug 31, 2026
Benson Molly REmployee Stock Option (right to buy) · Direct
0Aug 17, 2026
Brzezinski Erin MCommon Stock · Direct
1,576Aug 27, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 03 → Sep 03
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Top insiders
By absolute net value across the selected period- BR-$4.4M
- LM-$1.4M
- BM-$206.8k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
MPC transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| MPC | Lyon Shawn M | SLMGL | sale | 1.00k | -$37.5M | S | 0.0% | 09/01 | 08/31 | |
| MPC | Lyon Shawn M | SLMGL | sale | 425 | -$15.6M | S | 0.0% | 09/01 | 08/28 | |
| MPC | Brzezinski Erin M | VPCTRL | sale | 570 | -$20.6M | S | 0.0% | 08/31 | 08/27 | |
| MPC | Benson Molly R | CLOCS | sale10b5-1 | 5.00k | -$179M | S | +6.2% | 08/19 | 08/17 | |
| MPC | Benson Molly R | CLOCS | sale10b5-1 | 7.19k | -$258M | S | +6.2% | 08/19 | 08/17 | |
| MPC | Lyon Shawn M | SLMGL | sale | 2.50k | -$87.5M | S | +6.9% | 08/17 | 08/13 |
Marathon Petroleum Corp Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Marathon Petroleum Corp?
Lyon Shawn M, Brzezinski Erin M, Benson Molly R.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Lyon Shawn M reported a sale on Aug 31, 2026 valued at $37.5M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $5,987,276.77. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.