VOL. XCIV, NO. 247

★ WIDE MOAT STOCKS COMPARISON ★

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Wednesday, January 7, 2026

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Stock Comparison

Judges Scientific plc vs Monolithic Power Systems, Inc.

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

Judges Scientific plc

JDG · London Stock Exchange - AIM

Market cap (USD)—

Gross margin (TTM)—

Operating margin (TTM)—

Net margin (TTM)—

SectorTechnology

Industry—

CountryGB

Data as of2026-01-06

Moat score

63/ 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 Judges Scientific plc's moat claims, evidence, and risks.

View JDG analysis

Monolithic Power Systems, Inc.

MPWR · NASDAQ Global Select Market

Market cap (USD)$45.8B

Gross margin (TTM)55.2%

Operating margin (TTM)26%

Net margin (TTM)71.2%

SectorTechnology

IndustrySemiconductors

CountryUS

Data as of2025-12-25

Moat score

67/ 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 Monolithic Power Systems, Inc.'s moat claims, evidence, and risks.

View MPWR analysis

Comparison highlights

Moat score gap: Monolithic Power Systems, Inc. leads (67 / 100 vs 63 / 100 for Judges Scientific plc).
Segment focus: Judges Scientific plc has 2 segments (51.7% in Vacuum); Monolithic Power Systems, Inc. has 6 segments (32.5% in Enterprise Data).
Primary market structure: Competitive vs Oligopoly. Pricing power: Moderate vs Moderate.
Moat breadth: Judges Scientific plc has 3 moat types across 1 domains; Monolithic Power Systems, Inc. has 4 across 3.

Primary market context

Judges Scientific plc

Vacuum

Market

Vacuum and surface-science related instrumentation (e.g., UHV/vacuum components and systems, thin-film/surface engineering adjacent tools)

Geography

Global

Customer

Research labs and high-tech manufacturing

Role

Equipment manufacturer

Revenue share

51.7%

Monolithic Power Systems, Inc.

Enterprise Data

Market

Power management ICs and power modules for enterprise/data center servers (CPU/GPU/AI accelerators) and cloud/on-prem compute platforms

Geography

Global

Customer

OEMs/ODMs and cloud platform designers

Role

Fabless component supplier (power semiconductors)

Revenue share

32.5%

Side-by-side metrics

Judges Scientific plc

Monolithic Power Systems, Inc.

Ticker / Exchange

JDG - London Stock Exchange - AIM

MPWR - NASDAQ Global Select Market

Market cap (USD)

n/a

$45.8B

Gross margin (TTM)

n/a

55.2%

Operating margin (TTM)

n/a

26%

Net margin (TTM)

n/a

71.2%

Sector

Technology

Industry

n/a

Semiconductors

HQ country

Primary segment

Vacuum

Enterprise Data

Market structure

Competitive

Oligopoly

Market share

n/a

HHI estimate

n/a

Pricing power

Moderate

Moat score

63 / 100

67 / 100

Moat domains

Demand

Demand, Supply, Legal

Last update

2026-01-06

2025-12-25

Moat coverage

Shared moat types

Brand Trust

Judges Scientific plc strengths

Switching Costs GeneralBuy-and-build acquisition engine

Monolithic Power Systems, Inc. strengths

Design In QualificationOperational ExcellenceIP Choke Point

Segment mix

Judges Scientific plc segments

Full profile >

Materials Sciences

Competitive

48.4%

Vacuum

Competitive

51.7%

Monolithic Power Systems, Inc. segments

Full profile >

Enterprise Data

Oligopoly

32.5%

Storage and Computing

Competitive

22.7%

Automotive

Oligopoly

18.8%

Communications

Oligopoly

10.2%

Consumer

Competitive

9.1%

Industrial

Oligopoly

6.7%

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.