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We bolt onto teams to bring ideas to market and drive growth with data.

Our expertise
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The whole > the sum of its parts

About Us

We focus on the go-to-market moment for brands, ideas, and campaigns for teams of all sizes.

Bolting on pays off

Don’t just take our word for it

We work with a lot of agencies and I’ve been at this for 28 years. Almost every experience I’ve had with an outside firm is that they kind of sort of get it but they fall short. This is honestly the best concept presentation I’ve ever seen. Everything is spot on. You get our students. You’ve over delivered and I want it.

John Polstein, CEO at Kaplan Test Prep

Our partnership with Part and Sum has significantly elevated our brand presence. Their strategists and technologists have helped us learn more about our customers and turn those findings into actionable strategies.

Venus Williams, CEO EleVen

Part and Sum have been true partners in helping us to stand up a new growth team in our business. They seamlessly bolted on, helping us to move fast, and enabling the new team to run on their own moving forward. They’re my go-to when faced with a tough problem!

Laura Henderson, EVP, Marketing and eCommerce at Spin Master

2 years ago we launched a digital campaign under the recommendations of P+S, unsure of the brand’s digital potential. Under their guidance we have been able to scale our marketing spend by 10x while maintaining high returns. They are hands-on, helping us understand our performance. And they challenge us to produce new ideas that work beyond traditional modes.

Laura Cramer, Co-Founder at Apiece Apart

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We act as a fiduciary for the millions of dollars of media we manage each year.

Proud partners with

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Since 2018, we’ve helped our clients realize hundreds of millions in incremental revenue.


of our team members have founded and managed their own business before joining Part and Sum.


of our team members have been an early employee at a startup.