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SEC EDGARSEP 11 min read$MPC

Lyon Shawn M sold $532K of MPC

Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) sold 1,425 shares of Marathon Petroleum Corp (MPC) at an average of $373.59 ($368.51–$375.75, $0.53M total) across 2 trades over 2026-08-28 to 2026-08-31.

Original reporting
SEC EDGAR · Lyon Shawn M
Published Sep 1, 2026, 8:40 PM UTC
Analysis
alphai AI DeskAI-generated
Added to alphai Sep 1, 2026, 10:39 PM 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.
About alphai AI DeskScoring methodologyReport an issue
alphai market briefInsider activity
Primary signal
$MPC
Bearish
medium confidence
Mentioned
$MPC
Relevance
5/10
alphai data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MPCBearishLow
01

Why it matters

A senior officer's sale may prompt short sellers, but the modest size limits market impact.

02

Market read

Insider sell is a low‑to‑moderate signal for MPC; unlikely to move broader markets.

03

What to watch

No pre‑arranged 10b5‑1 plan; insider may be diversifying after recent price gains.

Relevance 5/10Novelty 4/10Timing: filed Sep 1, 2026

Background

Form 4 filings disclose insider transactions; traders watch for signals of confidence.

Company-level read

Ticker impact

$MPCBearishMedium confidence
Context

Insider Shawn Lyon sold 1,425 shares of Marathon Petroleum for $532K, reducing his stake to 11,194 shares.

Expected impact

Potential modest downward pressure in the next trading session.

Evidence & confidence

A $0.5M insider sale by a senior officer is material for a mid‑cap like MPC, but the amount is modest relative to market cap.

Market effects

Sector

Energy sector may see slight bearish sentiment from insider sell.

Regional

U.S. markets, particularly oil & gas stocks, could be marginally affected.

Global

Limited to investors tracking MPC and related energy equities.

Counterpoint

What could challenge this read

The sale could be routine portfolio rebalancing, not a negative signal.

Key entities

  • Company
    Marathon Petroleum Corp

    U.S. downstream energy company (ticker MPC).

  • Insider
    Shawn M. Lyon

    SVP Log & Storage at MPLX GP LLC, officer of Marathon Petroleum.

Read at source← All news

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.

MPC insider trading history →

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