Lyon Shawn M sold $875K of MPC

Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) sold 2,500 shares of Marathon Petroleum Corp (MPC) at $350.00 ($0.88M total) on 2026-08-13.

Original reporting
SEC EDGAR · Lyon Shawn M
Published Aug 17, 2026, 4:00 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 18, 2026, 7:08 AM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
AlphAI market briefInsider activity
Primary signal
$MPC
Neutral
high confidence
Mentioned
$MPC
Relevance
5/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MPCNeutralLow
01

Why it matters

The newest fact is the disclosed open-market sale amount, price, and post-transaction holdings; it does not include any company-specific news catalyst.

02

Market read

Traders may note insider selling, but the filing lacks fundamental drivers and is unlikely to change MPC valuation materially.

03

What to watch

Insider sales often have low predictive power unless paired with other disclosures (new guidance, investigations, major contracts) or repeated selling by multiple insiders.

Relevance 5/10Novelty 3/10Timing: filed 2026-08-17 after-hours; sale dated 2026-08-13

Background

The article is an SEC Form 4 insider transaction disclosure for Marathon Petroleum (MPC).

Company-level read

Ticker impact

$MPCNeutralHigh confidence
Context

Marathon Petroleum insider Lyon Shawn M sold 2,500 shares at $350 on 2026-08-13, totaling $875,000, per Form 4.

Expected impact

Limited near-term impact; any effect is likely sentiment-only and outweighed by broader fundamentals.

Evidence & confidence

The filing discloses transaction size, price, and holdings, but provides no new operational, financial, or regulatory information about MPC.

Market effects

Insider selling in a downstream energy name is not a sector-wide signal without corroborating fundamentals.

None indicated.

None indicated.

Counterpoint

The absence of a stated 10b5-1 plan does not necessarily imply bearish intent; sales can be driven by diversification, taxes, or pre-scheduled personal liquidity needs not captured here.

Key entities

  • Marathon Petroleum Corp

    Subject of the Form 4 insider transaction disclosure.

  • Lyon Shawn M

    SVP Log & Storage at MPLX GP LLC, reporting an open-market sale of MPC shares.

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

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