Warren Mead, CEO of Sumer

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Recognized as the UK’s leading mid-sized business accounting firm, Sumer provides professional support to SMEs across England, Scotland and Northern Ireland.

Sumer is one of the UK’s top 15 accoun­tancy firms and is committed to supporting SME businesses through local services backed by national expertise. Since its inception, Sumer has grown rapidly through strategic acqui­si­tions, now employing over 1,350 people across more than 40 offices and gener­ating an annual turnover of over £135 million.

Sumer’s strategy focuses on acquiring leading regional practices that share its ethos, values ​​and approach, forming regional hubs dedicated exclu­sively to the SME market. These hubs benefit from a broader range of customer services, technology and compliance support, funding for further acqui­si­tions and hub colleague oppor­tu­nities.

What was the inspiration behind Sumer?

After a fulfilling 26-year career at KPMG, I felt it was time for a new adventure beyond the struc­tured environment of a Big Four firm. The Covid lockdowns sparked a personal reset and re-ignited my entre­pre­neurial spirit, resulting in me stepping down as Chief Operating Officer and founding Sumer in 2023.

The inspi­ration for Sumer was the UK’s thriving but often overlooked SME community. I identified a signif­icant gap in the market and made Sumer’s mission to support SME businesses in England, Northern Ireland and Scotland. Our goal is to provide best-in-class accounting services to SMEs in their commu­nities, supporting a diverse range of local businesses, from family farms to tech scale-ups. These companies are the backbone of the UK economy, but they often lack the support they deserve.

Who do you admire?

I have great admiration for regional accoun­tants. Since leaving KPMG, I have appre­ciated the tremendous talent and commitment found in local and regional practices. These profes­sionals are every bit as skilled as the Big Four, have in-depth knowledge of the mid-market, and strive to go the extra mile for clients of all sizes.

As a member of the LGBTQ+ community, I also admire profes­sionals from diverse backgrounds who have achieved success, partic­u­larly in the accounting field. It’s not always easy to be your true self in this industry, as even well-meaning colleagues and customers can make conver­sa­tions uncom­fortable if they assume everyone is being honest. Attitudes are slowly changing, and I hope Sumer’s DE&I policies will help make the accounting sector more welcoming for everyone.

Looking back, is there anything you would have done differently?

I have thoroughly enjoyed every minute of this journey and feel lucky to be surrounded by talented and hard-working colleagues. Although I made some mistakes, I don’t regret them as each one provided valuable learning experi­ences that strengthened our offering. If anything, I would take more time to celebrate our progress, as my impatience often drives me to push further.

What defines your way of doing business?

Sumer is a mid-market private equity-backed accounting firm dedicated to supporting SMEs across the UK. We have grown quickly and have set up eleven regional hubs in just 18 months, employing over 1,350 colleagues.

Our unique shared ownership model sets us apart in the accounting market. All management teams hold equity stakes in their respective hubs, ensuring they are incen­tivized to serve customers and grow their reputation and revenue. This reciprocity forms a strong foundation for the devel­opment of Sumer.

My business approach focuses on helping others achieve their best and aligning incen­tives toward that goal. I firmly believe that growth comes from doing the right thing by customers and colleagues and maintaining zero tolerance for bad behavior or practices.

What advice would you give to someone starting out?

Entre­pre­neurs often have courage, creativity and passion for their markets. My advice is to take lots of small risks — exper­iment, learn what works, and quickly discard what doesn’t. Adjust and repeat this process.

Managing a rapidly growing organi­zation can quickly overwhelm even the most experi­enced employees. That’s why it’s important not to overexert yourself, otherwise you risk burnout and hinder the devel­opment of others. The distri­b­ution of leadership and respon­si­bil­ities is far wiser.

Additionally, working closely with a trusted accounting firm is invaluable. Our clients often tell me that our support has given them the confi­dence to invest and grow.

Finally, be brave. Ventures that address unmet needs and provide colleagues with a true sense of purpose have a solid foundation for success.


Paul Jones

Harvard alumni and former New York Times journalist. Editor of Business Matters, the UK’s largest business magazine, for over 15 years. I am also Head of Automotive at Capital Business Media and work for clients such as Red Bull Racing, Honda, Aston Martin and Infiniti.

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