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← Glossary
Growth & Go-to-Market

TAM / SAM / SOM

Also: Total Addressable Market

Nested market sizes — total addressable (TAM), serviceable (SAM) and the share you can realistically win (SOM).

Why it matters

Investors discount a giant top-down TAM; a credible bottom-up SOM you can actually reach is far more persuasive.

Hear it from people who've done it

Get the real-world version of "TAM / SAM / SOM" drawn from hundreds of conversations with founders and investors.

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Go deeper

Episodes on Sales & GTM

How Do You Grow a Marketplace When Both Sides Are Slow? Ishan Dan on RegenX

Pick My Brain with Alan Jones · 12 August 2026

How Do You Grow a Marketplace When Both Sides Are Slow? Ishan Dan on RegenX
How Do You Sell Software to an Industry That Won't Change? Mitchell Baker on Claimstack

Pick My Brain with Alan Jones · 29 July 2026

How Do You Sell Software to an Industry That Won't Change? Mitchell Baker on Claimstack
What Makes a Founder Worth Backing at Pre-Seed? With Ilana Elbaz | GTM at Deel

First Cheque with Cheryl Mack & Maxine Minter · 20 July 2026

What Makes a Founder Worth Backing at Pre-Seed? With Ilana Elbaz | GTM at Deel
All Sales & GTM episodes →
Related terms

Ideal customer profile

A precise description of the customer you serve best — the one who buys fastest, stays longest and pays most.

Go-to-market

How you reach customers and turn them into revenue — the channels, motion and pricing that get the product sold.

← Back to the full glossary

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