The cluster is too small to warrant a bearish read-through. Monitor for any larger insider sales or a pattern of C-suite selling above 0.1% of market cap before adjusting position. The strong historical T+20 returns on MPC reports suggest the stock may continue to drift upward on its own fundamentals.
Price Chart
Executive Summary
Three Marathon Petroleum insiders, including the Chief Legal Officer and an Executive VP, sold a combined $5.51M in open-market stock over a week. While the dollar amount is small relative to MPC's $102.8B market cap (0.005%), the cluster involves senior C-suite and operational leadership, and the sales follow option exercises, suggesting a routine post-vesting diversification pattern rather than a bearish signal. The historical calibration shows strong positive T+20 performance on prior MPC reports, but this cluster's proportionality is too small to drive a directional call.
Key Financial Metrics
Key Facts
- Three insiders sold a total of $5.51M in open-market transactions over a 7-day window.
- Chief Legal Officer Molly Benson sold ~$4.37M after exercising options at $0 and $47.73 strike prices.
- SVP Shawn Lyon sold $875K and Ex VP Michael Henschen sold $2.05M.
- Total sales represent ~0.005% of MPC's $102.8B market cap, well below the 0.1% materiality threshold.
- All sales follow derivative exercises, consistent with routine tax and diversification planning, not informed selling.
Financial Impact
Insider sales of $5.51M represent 0.005% of market cap — immaterial
Risk Factors
- Insider sales could accelerate if the stock continues to rally, but current scale is routine
- No evidence of informed selling — all sales are post-exercise and small relative to market cap
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MPC-1787197111426 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 1, 2026 4w ago | Insider Cluster | $383.00 $395.42 | ▲ +3.24% | ▲ +3.13% | $420.15 (+9.70%) |
Aug 19, 2026 6w ago | Insider Cluster | $360.75 $421.96 | ▲ +16.97% | ▲ +18.92% | $420.15 (+16.47%) |
Aug 17, 2026 6w ago | Insider Cluster | $358.18 $410.84 | ▲ +14.70% | ▲ +16.68% | $420.15 (+17.30%) |
Aug 4, 2026 8w ago | 8-K | $312.61 $383.00 | ▲ +22.52% | ▲ +23.75% | $420.15 (+34.40%) |
Jun 29, 2026 13w ago | 8-K | $259.22 $309.24 | ▲ +19.30% | ▲ +19.58% | $420.15 (+62.08%) |
May 6, 2026 21w ago | S-3ASR | $242.17 $267.21 | ▲ +10.34% | ▲ +7.21% | $420.15 (+73.50%) |
May 5, 2026 21w ago | 8-K | $259.78 $263.06 | ▲ +1.26% | ▼ −3.69% | $420.15 (+61.73%) |
Apr 21, 2026 23w ago | Court Ruling | $220.35 $263.02 | ▲ +19.36% | ▲ +15.15% | $420.15 (+90.67%) |
Apr 21, 2026 23w ago | Court Ruling | $220.35 $263.02 | ▲ +19.36% | ▲ +15.15% | $420.15 (+90.67%) |
Apr 13, 2026 24w ago | 8-K | $223.72 $252.48 | ▲ +12.86% | ▲ +6.56% | $420.15 (+87.80%) |
US Market Status
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