Gain Theory, A Global Foresight Consultancy

We accelerate growth for ambitious brands

We are a global marketing effectiveness and foresight consultancy. By fusing deep expertise with advanced AI, we empower marketers to make smarter and faster data-informed investments that deliver unmatched value.

Gain Theory named a Leader in The Forrester Wave™:

Marketing Measurement and Optimization Services, Q1 2026.

$

26

bn

in client value generated

50

+

years of experience

910

client recommendation score

What we think

CPG giant accelerates data quality, delivery times, creative ROI

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Fergal Smithwick Gain Theory

News | 24 March 2026

Introducing… Fergal Smithwick, Senior Director, Client Success

Yoga influencer films herself

Global brand unlocks 27% hidden value from sponsorship investments

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Research | 2 February 2026

Gain Theory, a WPP company, named a leader in marketing measurement and optimization by global independent research firm

News | 20 March 2026

Why 88% of marketers aren’t capturing marketing value and 5 ways to solve it

Research | 16 March 2026

Podcast – Breaking Past Media: From Marketing Mix Modeling to a Business Driver Mix

Want to know what our industry-leading experts have to say?

Using our award-winning solutions, you can:

Focus on measuring what matters

Increase speed and quality of insights

Create value over the short and long term

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award-winning solutions?

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Meet our people

Fergal Smithwick Gain Theory

Meet our people

Fergal Smithwick

Senior Director, Client Success

Fergal discusses the importance of CPG companies improving their overall brand experience, how MMM can used to measure and optimize recruitment targets, and why he’s passionate about helping new marketing effectiveness analysts to succeed.