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The newly published Influence 100 list from MemberWise ranks the UK’s largest membership organisations by total membership size. This annual list offers a clear picture of the organisations shaping professional communities and driving sector-wide impact.
At Cantarus, we view this list as more than just a measurement of reach. It prompts the question, what does it really take to become influential in today’s membership landscape?
While the Influence 100 ranks organisations by membership volume, many of those on the list share more than just size. They’ve evolved and adapted, investing in strategies that make their digital infrastructure a real driver of value.
This reflects what we've observed – size and influence increasingly go hand in hand with digital maturity: the ability to deliver connected, intelligent, and member-led experiences at scale.
From our work supporting digital platforms that now serve over 5 million members, we’re seeing the same digital behaviours repeated across the most forward-thinking membership bodies:
These trends are echoed in MemberWise’s Digital Excellence 2025/26 Research, where organisations highlighted platform integration, personalisation, and digital content strategy as key drivers of performance, and ongoing challenges for many.
Influence is no longer just about size – it’s about readiness. It’s about building for the future, strengthening your foundations, understanding your members deeply, and aligning your tech stack to deliver real, measurable outcomes.
We’ll continue supporting the sector through:
We’re proud to work with many organisations featured in the Influence 100, supporting them on projects that range from CRM transformations and CMS upgrades to launching high-impact member communities and strategic consultancy.
Across our portfolio, we support digital platforms serving over 5 million members – helping leading bodies not just stay relevant but thrive.
Whether you're on the list or aspire to be, we're here to help you get more value from every digital touchpoint, connect more meaningfully with your members, and elevate your influence.
The Influence 100 is a recognition of size but also, increasingly, of strategy. The organisations gaining ground today are those using digital tools not just to serve members, but to truly understand and empower them.
If you’re moving in that direction, we’d love to support you on the journey.
Get in touch today to discover how we support the UK’s most ambitious membership organisations.