VOL. XCIV, NO. 247
★ WIDE MOAT STOCKS COMPARISON ★
NO ADVICE
Wednesday, December 31, 2025
Stock Comparison
Marsh & McLennan Companies, Inc. vs O'Reilly Automotive, Inc.
Compare moat strength, market structure, and segment coverage to understand how each company defends its edge.
Marsh & McLennan Companies, Inc.
MMC · New York Stock Exchange
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
Full stock profile
Dive deeper into Marsh & McLennan Companies, Inc.'s moat claims, evidence, and risks.
View MMC analysisO'Reilly Automotive, Inc.
ORLY · Nasdaq Global Select Market
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
Full stock profile
Dive deeper into O'Reilly Automotive, Inc.'s moat claims, evidence, and risks.
View ORLY analysisComparison highlights
- Moat score gap: Marsh & McLennan Companies, Inc. leads (65 / 100 vs 63 / 100 for O'Reilly Automotive, Inc.).
- Segment focus: Marsh & McLennan Companies, Inc. has 2 segments (62.8% in Risk and Insurance Services); O'Reilly Automotive, Inc. has 2 segments (52% in DIY Aftermarket Retail).
- Moat breadth: Marsh & McLennan Companies, Inc. has 5 moat types across 3 domains; O'Reilly Automotive, Inc. has 7 across 2.
Primary market context
Marsh & McLennan Companies, Inc.
Risk and Insurance Services
Insurance brokerage, risk advisory, and reinsurance brokerage/services
Global
Enterprises, public entities, associations, and individuals (via broker/agent channels)
Intermediary + advisor (insurance/reinsurance market intermediary)
62.8%
O'Reilly Automotive, Inc.
DIY Aftermarket Retail
Specialty automotive aftermarket parts retail (DIY channel)
United States, Puerto Rico, Mexico, Canada
Consumers (do-it-yourself vehicle owners)
Specialty retailer
52%
Side-by-side metrics
Moat coverage
Shared moat types
Marsh & McLennan Companies, Inc. strengths
O'Reilly Automotive, Inc. strengths
Segment mix
Marsh & McLennan Companies, Inc. segments
Full profile >Risk and Insurance Services
Oligopoly
Consulting
Competitive
O'Reilly Automotive, Inc. segments
Full profile >DIY Aftermarket Retail
Oligopoly
Professional (B2B) Aftermarket Distribution
Competitive
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View the moat stocks listCuration & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.