VOL. XCIV, NO. 247
★ WIDE MOAT STOCKS COMPARISON ★
NO ADVICE
Tuesday, December 30, 2025
Stock Comparison
Merck & Co., Inc. vs Pfizer 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
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 analysisPfizer Inc.
PFE · New York Stock Exchange
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
Comparison highlights
- Moat score gap: Merck & Co., Inc. leads (71 / 100 vs 58 / 100 for Pfizer Inc.).
- Segment focus: Merck & Co., Inc. has 2 segments (89.5% in Pharmaceutical); Pfizer Inc. has 5 segments (47.4% in Primary Care).
- Primary market structure: Competitive vs Oligopoly. Pricing power: Moderate vs Moderate.
- Moat breadth: Merck & Co., Inc. has 5 moat types across 3 domains; Pfizer Inc. has 8 across 3.
Primary market context
Merck & Co., Inc.
Pharmaceutical
Branded prescription pharmaceuticals & human vaccines
Global
Wholesalers/retailers, managed care and government payers, hospitals/clinics
R&D-intensive innovator, manufacturer, and marketer
89.5%
Pfizer Inc.
Primary Care
Branded primary care medicines and vaccines (incl. cardiovascular, migraine, pneumococcal/RSV/COVID-19)
Global
Healthcare providers, payers/PBMs, pharmacies/wholesalers, and government procurement
Innovator biopharma (R&D + manufacturing + commercialization)
47.4%
Side-by-side metrics
Moat coverage
Shared moat types
Merck & Co., Inc. strengths
Pfizer Inc. strengths
Segment mix
Merck & Co., Inc. segments
Full profile >Pharmaceutical
Competitive
Animal Health
Oligopoly
Pfizer Inc. segments
Full profile >Primary Care
Oligopoly
Specialty Care
Oligopoly
Oncology
Competitive
Pfizer CentreOne
Competitive
Pfizer Ignite
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.