VOL. XCIV, NO. 247

★ WIDE MOAT STOCKS COMPARISON ★

NO ADVICE

Wednesday, December 31, 2025

Stock Comparison

American Tower Corporation vs Aon plc

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

American Tower Corporation

AMT · New York Stock Exchange

Market cap (USD)
SectorReal Estate
CountryUS
Data as of2025-12-31
Moat score
76/ 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 American Tower Corporation's moat claims, evidence, and risks.

View AMT analysis

Aon plc

AON · New York Stock Exchange

Market cap (USD)$76.6B
SectorFinancials
CountryIE
Data as of2025-12-31
Moat score
70/ 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 Aon plc's moat claims, evidence, and risks.

View AON analysis

Comparison highlights

  • Moat score gap: American Tower Corporation leads (76 / 100 vs 70 / 100 for Aon plc).
  • Segment focus: American Tower Corporation has 3 segments; Aon plc has 2 segments (67% in Risk Capital).
  • Moat breadth: American Tower Corporation has 6 moat types across 4 domains; Aon plc has 6 across 3.

Primary market context

American Tower Corporation

U.S. & Canada Communications Sites

Market

Wireless communications site leasing (macro towers, rooftops and DAS)

Geography

United States and Canada

Customer

Wireless carriers and other tenants (broadcast, data, government/municipal)

Role

Independent owner/operator of communications real estate (towerco)

Aon plc

Risk Capital

Market

Large-account commercial insurance & reinsurance brokerage and risk advisory

Geography

Global

Customer

Enterprises, insurers, reinsurers

Role

Intermediary/advisor

Revenue share

67%

Side-by-side metrics

American Tower Corporation
Aon plc
Ticker / Exchange
AMT - New York Stock Exchange
AON - New York Stock Exchange
Market cap (USD)
n/a
$76.6B
Sector
Real Estate
Financials
HQ country
US
IE
Primary segment
U.S. & Canada Communications Sites
Risk Capital
Market structure
Oligopoly
Oligopoly
Market share
n/a
n/a
HHI estimate
n/a
n/a
Pricing power
Moderate
Moderate
Moat score
76 / 100
70 / 100
Moat domains
Demand, Legal, Supply, Network
Demand, Supply, Legal
Last update
2025-12-31
2025-12-31

Moat coverage

Shared moat types

Switching Costs General

American Tower Corporation strengths

Long Term ContractsPermits Rights Of WayPhysical Network DensityInteroperability HubCapacity Moat

Aon plc strengths

Data Workflow LockinService Field NetworkBrand TrustCompliance AdvantageScale Economies Unit Cost

Segment mix

American Tower Corporation segments

Full profile >

U.S. & Canada Communications Sites

Oligopoly

n/a

International Communications Sites

Oligopoly

n/a

Data Centers

Competitive

n/a

Aon plc segments

Full profile >

Risk Capital

Oligopoly

67%

Human Capital

Oligopoly

33.2%

Want the full wide moat stocks list?

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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.