VOL. XCIV, NO. 247

★ WIDE MOAT STOCKS COMPARISON ★

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Sunday, January 11, 2026

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Stock Comparison

Arthur J. Gallagher & Co. vs S&P Global Inc.

Compare moat strength, market structure, and segment coverage to understand how each company defends its edge.

Arthur J. Gallagher & Co.

AJG · New York Stock Exchange

Market cap (USD)$67.9B
Gross margin (TTM)—
Operating margin (TTM)—
Net margin (TTM)—
SectorFinancials
IndustryInsurance - Brokers
CountryUS
Data as of2026-01-09
Moat score
69/ 100

Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.

Full stock profile

Dive deeper into Arthur J. Gallagher & Co.'s moat claims, evidence, and risks.

View AJG analysis

S&P Global Inc.

SPGI · New York Stock Exchange

Market cap (USD)$164.1B
Gross margin (TTM)70%
Operating margin (TTM)40.7%
Net margin (TTM)27.5%
SectorFinancials
IndustryFinancial - Data & Stock Exchanges
CountryUS
Data as of2025-12-21
Moat score
77/ 100

Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.

Full stock profile

Dive deeper into S&P Global Inc.'s moat claims, evidence, and risks.

View SPGI analysis

Comparison highlights

  • Moat score gap: S&P Global Inc. leads (77 / 100 vs 69 / 100 for Arthur J. Gallagher & Co.).
  • Segment focus: Arthur J. Gallagher & Co. has 2 segments (86% in Brokerage); S&P Global Inc. has 5 segments (32.6% in S&P Global Market Intelligence).
  • Moat breadth: Arthur J. Gallagher & Co. has 4 moat types across 2 domains; S&P Global Inc. has 9 across 5.

Primary market context

Arthur J. Gallagher & Co.

Brokerage

Market

Insurance and reinsurance brokerage and consulting

Geography

Global

Customer

Commercial, industrial, public sector, nonprofit and other organizations; underwriting enterprises for reinsurance placements

Role

Intermediary / broker / advisor

Revenue share

86%

S&P Global Inc.

S&P Global Market Intelligence

Market

Financial market data, analytics, and workflow tools for institutions

Geography

Global

Customer

B2B (institutional investors, banks, insurers, corporates)

Role

Data/analytics and workflow software provider

Revenue share

32.6%

Side-by-side metrics

Arthur J. Gallagher & Co.
S&P Global Inc.
Ticker / Exchange
AJG - New York Stock Exchange
SPGI - New York Stock Exchange
Market cap (USD)
$67.9B
$164.1B
Gross margin (TTM)
n/a
70%
Operating margin (TTM)
n/a
40.7%
Net margin (TTM)
n/a
27.5%
Sector
Financials
Financials
Industry
Insurance - Brokers
Financial - Data & Stock Exchanges
HQ country
US
US
Primary segment
Brokerage
S&P Global Market Intelligence
Market structure
Oligopoly
Oligopoly
Market share
n/a
n/a
HHI estimate
n/a
n/a
Pricing power
Moderate
Moderate
Moat score
69 / 100
77 / 100
Moat domains
Supply, Demand
Demand, Supply, Legal, Network, Financial
Last update
2026-01-09
2025-12-21

Moat coverage

Shared moat types

Brand TrustData Workflow Lockin

Arthur J. Gallagher & Co. strengths

Service Field NetworkOperational Excellence

S&P Global Inc. strengths

Scope EconomiesRegulated Standards PipeDe Facto StandardCompliance AdvantageSwitching Costs GeneralEcosystem ComplementsBenchmark Pricing Power

Segment mix

Arthur J. Gallagher & Co. segments

Full profile >

Brokerage

Oligopoly

86%

Risk Management

Competitive

14%

S&P Global Inc. segments

Full profile >

S&P Global Market Intelligence

Oligopoly

32.6%

S&P Global Ratings

Oligopoly

29.6%

S&P Global Commodity Insights

Oligopoly

15.1%

S&P Global Mobility

Competitive

11.3%

S&P Dow Jones Indices

Oligopoly

11.4%

Want the full wide moat stocks list?

Browse the full ranking of wide moat stocks, updated with moat scores and segment context.

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Looking for expansion-stage stocks?

Proven models entering the expansion stage with unit economics that work.

View expansion-stage stocks

Curation & 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.