BHP agrees to join Sumer Group in one of biggest accountancy deals of 2025

The Yorkshire-based professional services firm BHP has agreed to join Sumer Group in one of the biggest accountancy sector deals of 2025.

Following the conclusion of the deal, BHP will bring its 150-year heritage into Sumer, along with more than 420 staff and five offices across Sheffield, Leeds, York, Cleckheaton and Chesterfield.

BHP offers a range of services including assurance, advisory, tax and corporate finance. Its leadership team will remain in place.

Sumer, which has grown rapidly through acquisition and organic growth, employs around 3,000 staff, across more than 60 offices, and generates annual revenues exceeding £265m.

(from left) Hamish Morrison Joint CEO of BHP, Warren Mead, Chief Executive Officer of Sumer and Lisa Leighton Joint CEO of BHP. (Photo supplied on behalf of BHP)placeholder image
(from left) Hamish Morrison Joint CEO of BHP, Warren Mead, Chief Executive Officer of Sumer and Lisa Leighton Joint CEO of BHP. (Photo supplied on behalf of BHP)

Warren Mead, Chief Executive Officer of Sumer, said: “This is a standout moment for Sumer and a brilliant way to finish the year. BHP is a powerhouse in Yorkshire with a long track record of helping businesses thrive.

"Their culture, ambition and commitment to quality make them an exceptional fit for us. We’re delighted to welcome them and incredibly excited about what we can achieve together for SMEs (small and medium-sized enterprises) across the region and beyond.”

Lisa Leighton, Joint Managing Partner at BHP, commented: “Joining Sumer marks a new chapter for BHP. Our five-year plan sets out goals for growth and innovation, and partnering with a group that shares our values and drive gives us the platform to accelerate that journey.”

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