VOL. XCIV, NO. 247

★ WIDE MOAT STOCKS COMPARISON ★

NO ADVICE

Stock Comparison

Merck & Co., Inc. vs Zoetis Inc.

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

Merck & Co., Inc.

MRK · New York Stock Exchange

Market cap (USD)$305.4B
Gross margin (TTM)81.5%
Operating margin (TTM)41.2%
Net margin (TTM)28.1%
SectorHealthcare
IndustryDrug Manufacturers - General
CountryUS
Data as of2025-12-22
Moat score
71/ 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 Merck & Co., Inc.'s moat claims, evidence, and risks.

View MRK analysis

Zoetis Inc.

ZTS · New York Stock Exchange

Market cap (USD)$56.8B
Gross margin (TTM)70.5%
Operating margin (TTM)38%
Net margin (TTM)28.2%
SectorHealthcare
IndustryDrug Manufacturers - Specialty & Generic
CountryUS
Data as of2025-12-26
Moat score
73/ 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 Zoetis Inc.'s moat claims, evidence, and risks.

View ZTS analysis

Comparison highlights

  • Moat score gap: Zoetis Inc. leads (73 / 100 vs 71 / 100 for Merck & Co., Inc.).
  • Segment focus: Merck & Co., Inc. has 2 segments (89.5% in Pharmaceutical); Zoetis Inc. has 3 segments (67.8% in Companion Animal Products).
  • Primary market structure: Competitive vs Oligopoly. Pricing power: Moderate vs Strong.
  • Moat breadth: Merck & Co., Inc. has 5 moat types across 3 domains; Zoetis Inc. has 9 across 3.

Primary market context

Merck & Co., Inc.

Pharmaceutical

Market

Branded prescription pharmaceuticals & human vaccines

Geography

Global

Customer

Wholesalers/retailers, managed care and government payers, hospitals/clinics

Role

R&D-intensive innovator, manufacturer, and marketer

Revenue share

89.5%

Zoetis Inc.

Companion Animal Products

Market

Companion animal veterinary medicines, vaccines and diagnostics

Geography

Global

Customer

Veterinarians, veterinary clinics, pet owners (via prescription/retail)

Role

Manufacturer and marketer

Revenue share

67.8%

Side-by-side metrics

Merck & Co., Inc.
Zoetis Inc.
Ticker / Exchange
MRK - New York Stock Exchange
ZTS - New York Stock Exchange
Market cap (USD)
$305.4B
$56.8B
Gross margin (TTM)
81.5%
70.5%
Operating margin (TTM)
41.2%
38%
Net margin (TTM)
28.1%
28.2%
Sector
Healthcare
Healthcare
Industry
Drug Manufacturers - General
Drug Manufacturers - Specialty & Generic
HQ country
US
US
Primary segment
Pharmaceutical
Companion Animal Products
Market structure
Competitive
Oligopoly
Market share
n/a
n/a
HHI estimate
n/a
n/a
Pricing power
Moderate
Strong
Moat score
71 / 100
73 / 100
Moat domains
Legal, Supply, Demand
Demand, Supply, Legal
Last update
2025-12-22
2025-12-26

Moat coverage

Shared moat types

IP Choke PointRegulated Standards Pipe

Merck & Co., Inc. strengths

Capex Knowhow ScaleScope EconomiesData Workflow Lockin

Zoetis Inc. strengths

Brand TrustService Field NetworkInstalled Base ConsumablesCapacity MoatDistribution ControlCompliance AdvantageOperational Excellence

Segment mix

Merck & Co., Inc. segments

Full profile >

Pharmaceutical

Competitive

89.5%

Animal Health

Oligopoly

9.2%

Zoetis Inc. segments

Full profile >

Companion Animal Products

Oligopoly

67.8%

Livestock Products

Oligopoly

31.3%

Client Supply Services & Human Health

Competitive

0.9%

Want the full wide moat stocks list?

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

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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.