5. Opus
Headcount in latest accounts: 135
HQ: Reigate, Surrey
Date of certification: March 2026
This Surrey-based 8×8, Microsoft, Gamma and Mitel partner in March became one of the largest UK MSPs yet to convert to B Corp status.
Opus boasts around 150 staff, revenues of over £37m and around 900 clients, making the accreditation process trickier than for some smaller peers, Marketing Director Nikki Laker told us at the time.
Opus employees must do at least one day’s volunteering each year, while the company has funded a three-year fellowship at non-profit Polar Bears International.
What Opus Marketing Director Nikki Laker said about B Corp:
“Our customers know what B Corp means. They’re either focused on achieving it themselves, or they want to work with a reputable business and one that’s sustainable.
“It’s hugely beneficial for us to hold it.”
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