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BHP has joined the Sumer network following a landmark deal, becoming the largest independent practice to join a national group in 2025.The Yorkshire-based firm brings its 150-year heritage to Sumer, as well as more than 420 employees and five offices across Sheffield, Leeds, York, Cleckheaton and Chesterfield.
The firm provides a comprehensive suite of services spanning assurance, advisory, tax and corporate finance. Its leadership team will remain in place to continue delivering its recently set out five-year strategy.
Sumer said BHP brings “exceptional regional scale, deep sector expertise and a reputation for straight-talking, relationship-driven advice”. It added that the deal represents a “major strategic milestone”, and expands the group’s footprint across Yorkshire whilst strengthening its national corporate finance capabilities.
Having integrated 41 firms across the UK, Sumer now has more than 65 offices and over 3,000 employees, and signed 15 deals in 2025 alone.
Warren Mead, CEO 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. Lisa, Hamish and the team have built something very special.
“A firm that truly champions its clients and communities. We’re delighted to welcome them and incredibly excited about what we can achieve together for SMEs across the region and beyond.”
Lisa Leighton, joint managing partner at BHP, added: “Joining Sumer marks a bold new chapter for BHP. Our five-year plan sets out ambitious goals for growth and innovation, and partnering with a Group that shares our values, and drive gives us the platform to accelerate that journey.”
Hamish Morrison, joint managing partner at BHP, concluded: “Maintaining our cultural DNA was vital in finding a partner who can support our growth ambitions. This move expands what we can offer our clients and creates new opportunities for our colleagues across Yorkshire. We’re proud to become part of Sumer and look forward to shaping our future together.”
