Hacking Growth by Sean Ellis and Morgan Brown: summary and B2B takeaways

Hacking Growth: How Today’s Fastest-Growing Companies Drive Breakout Success is a 2017 book by Sean Ellis and Morgan Brown, published by Crown Currency. Its method is cross-functional teams running rapid, repeated tests to find what drives growth. The loop is simple: analyse, generate ideas, prioritise, test, then repeat. This page summarises the method, shows how a B2B marketing team can use it, and sets out where it needs adapting.

Correct as of 27 October 2026.

“Here, growth-hacking pioneers Ellis and Brown show how to break down those traditional barriers and marry powerful data analysis, technical know-how, and marketing savvy to quickly devise and test ways to fuel breakout growth.”

Nir Eyal, bestselling author of Hooked, in an endorsement on the publisher’s page

The method in one loop

The book’s central idea is a repeating cycle with four stages:

1. Analyse. Study the data and the customers who already love the product. Ellis starts with a qualitative question: who loves it, and why.
2. Generate ideas. The whole team contributes, not only marketing.
3. Prioritise. Score ideas so the best ones go first. Ellis’s own slides score ideas on impact, confidence and ease, which is the ICE framework.
4. Test. Run the tests, read the results, then return to analysis to decide what to do next.

The point is volume and learning speed. Ellis’s guidance on tempo is specific:

“It’s much better to make sure that every week, we’re running at least 3-5 different tests, depending on the size of the company.”

Sean Ellis, author of Hacking Growth, as quoted by Startup Archive

What the book covers

The first chapters set up the work before any testing starts:

• Build a growth team. The first chapter, “Building growth teams”, sets up the cross-functional team that runs the tests.
• Check the product is must-have. The second chapter, “Determining if your product is must-have”, comes before the chapters on growth levers and high-tempo testing.
• Identify your growth levers. Narrow the focus to the few places where a change could move the number.
• Test at high tempo. Run the loop above on a weekly rhythm.

The later chapters cover hacking acquisition, activation, retention and monetisation.

What it means for B2B marketing teams

The method translates well if you treat each test as a marketing campaign with a hypothesis, a baseline and an end date.

• Pick one metric. Ellis recommends starting with a single North Star Metric that everyone can connect their work to, as Turing Fest reports. Our guide to the North Star Metric shows how to choose one.
• Hold a weekly meeting. Review results, choose what to run next, and keep the backlog growing. See our notes on the growth team meeting.
• Make it cross-functional. Ellis has said the cross-functional challenge holds a lot of companies back.

“Most product teams don’t want to get direction from marketing teams. And marketing teams don’t want to get direction from product teams.”

Sean Ellis, founder of the growth hacking movement, speaking to Lenny Rachitsky, as reported by Turing Fest

Where the book needs adapting

• The name oversells tricks. Ellis himself has said the best growth hacks are not things that trick people. They find where users get confused and make the product easier. Read the book as a testing discipline, not a bag of tactics.
• B2B volume is lower. Our view: most B2B sites cannot run many statistically clean A/B tests, so tests need bigger changes, longer windows or leading indicators. Our guides to the minimum viable test and testing velocity cover this.
• It dates from 2017. The loop still holds. Our view: AI now speeds up analysis and idea generation, so a high tempo target is easier to reach than it was in 2017.
• Tempo needs a target. More tests only helps when each one is tied to a hypothesis and to your goal. Start from a clear growth hypothesis.

How to apply it

1. Set one goal and one metric before choosing any tests.
2. Check the basics. Confirm the product is must-have for a named segment, and map the funnel with the AARRR framework.
3. Build a backlog of 20 ideas, then score them with ICE.
4. Commit to a weekly tempo. Start at three tests a week if you can, fewer if your traffic is low.
5. Record every result, including the losses, and feed them back into the next round of analysis.

The bottom line

The lasting idea in Hacking Growth is a system, not a tactic: one metric, a cross-functional team, and a weekly rhythm of tests that gets faster as you learn. B2B teams should keep the loop and adapt the test design to lower volume. For a wider reading list, see the best growth marketing books, and compare the role in our guide to the growth hacker.

About Growth Method

The book’s core rule is a steady weekly tempo of tests against one goal, which is hard to sustain across spreadsheets and chat threads. Growth Method gives B2B marketing teams AI agents that run their campaigns: plan, launch and analyse, from live data, against one goal, then repeat.

We are on-track to deliver a 43% increase in inbound leads this year. There is no doubt the adoption of Growth Method is the primary driver behind these results.

Laura Perrott, Colt Technology Services

Get started and run your first campaign against a baseline, then repeat the loop every week.

Frequently asked questions

What is Hacking Growth about?

Hacking Growth is a 2017 book by Sean Ellis and Morgan Brown, published by Crown Currency. It sets out a method for growth built on cross-functional teams and rapid, repeated testing: analyse, generate ideas, prioritise them, test them, then repeat.

What is high-tempo testing?

High-tempo testing is the book’s term for running a steady, high volume of small tests every week so a team learns what works faster. Ellis suggests at least three to five different tests a week, depending on the size of the company.

Does Hacking Growth work for B2B marketing teams?

The loop works, but B2B teams usually have lower traffic and longer sales cycles than the consumer products in the book. That means fewer statistically clean A/B tests, so teams lean on leading indicators, smaller tests and clear before and after baselines. See our guide to testing velocity.

What should you do before running growth tests?

The book places its chapter on determining whether your product is must-have before its chapters on growth levers and high-tempo testing. The order is the advice: confirm people need the product before you test growth tactics on it.