Company lists · Data refreshed September 2026

Top 25 Membership organizations based in the United Kingdom

Name: Membership organizations based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 346 companies tracked

RevenueBase identified 346 membership organizations headquartered in the United Kingdom as of September 2026 and tracks 2,983 professional contacts across them, including 819 with verified work emails. London is the largest hub.

This list covers membership organizations headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

346Companies

2,983Contacts tracked

819Verified emails

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The 25 largest membership organizations based in the United Kingdom

Ranked by team size

Top 25 of 346 membership organizations based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to membership organizations: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Broker Network	Indirect evidence	Knaresborough, United KingdomHQ checked Sep 20, 2026	51-200	207 contacts →
	Indirect evidence “As a nationwide Network, we offer independent brokers a range of impeccably-led services that are proven to improve market presence and generate healthy profit.” Source: RevenueBase Database · checked Sep 20, 2026
2	THINK	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	83 contacts →
	Strong evidence “Think is the UK’s leading membership content agency, specialising in building engagement and driving loyalty through effective content.” Source: RevenueBase Database · checked Sep 20, 2026
3	Boundless By Csma	Indirect evidence	Brighton, United KingdomHQ checked Sep 20, 2026	51-200	76 contacts →
	Indirect evidence “Working in or retired from the public sector or civil service?” Source: RevenueBase Database · checked Sep 20, 2026
4	AIMA	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	73 contacts →
	Strong evidence “AIMA is the world’s largest membership association for alternative investment managers.” Source: RevenueBase Database · checked Sep 20, 2026
5	Bristol Sport	Indirect evidence	Bristol, United KingdomHQ checked Sep 20, 2026	51-200	58 contacts →
	Indirect evidence “Bristol Sport promotes access to professional sport and participation in sport across all age and capability ranges.” Source: RevenueBase Database · checked Sep 20, 2026
6	Managing Partners' Forum	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	n/a	50 contacts →
	Strong evidence “Managing Partners' Forum is a membership organisation dedicated to helping professional firms grow by providing insights to improve performance, increase profitability and prepare…” Source: RevenueBase Database · checked Sep 20, 2026
7	Institute Of Sales Professionals	Strong evidence	Harpenden, United KingdomHQ checked Sep 20, 2026	11-50	49 contacts →
	Strong evidence “Sales professionals deserve a membership body that champions them.” Source: RevenueBase Database · checked Sep 20, 2026
8	Movo Partnership	Indirect evidence	Chislehurst, United KingdomHQ checked Sep 20, 2026	11-50	42 contacts →
	Indirect evidence “The Movo Partnership is a network that has been created by its members to take advantage of centralising compliance and operational functions, improving buying power and to help…” Source: RevenueBase Database · checked Sep 20, 2026
9	Wattle	Strong evidence	Bristol, United KingdomHQ checked Sep 20, 2026	11-50	40 contacts →
	Strong evidence “Wattle partners with membership organisations to deliver successful digital transformation through the deployment of MemEx – our Membership Experience Platform.” Source: RevenueBase Database · checked Sep 20, 2026
10	The Association Of Learned And Professional Society Publishers	Strong evidence	Watford, United KingdomHQ checked Sep 20, 2026	11-50	40 contacts →
	Strong evidence “ALPSP is an international membership trade body that supports and represents not-for-profit organisations and institutions that publish scholarly and professional content.” Source: RevenueBase Database · checked Sep 20, 2026
11	Arts Marketing Association	Strong evidence	Cambridge, United KingdomHQ checked Sep 20, 2026	11-50	39 contacts →
	Strong evidence “The Arts Marketing Association (AMA) is the UK's only membership organisation dedicated to supporting, fostering and advocating for the marketing community for arts, culture and…” Source: RevenueBase Database · checked Sep 20, 2026
12	Harlands By Xplor	Strong evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 20, 2026	51-200	36 contacts →
	Strong evidence “Established for over 25 years, Harlands Group is a leading provider of membership management services to leisure, health and fitness operators in the UK.” Source: RevenueBase Database · checked Sep 20, 2026
13	DISA	Indirect evidence	Worcestershire, United KingdomHQ checked Sep 20, 2026	501-1,000	34 contacts →
	Indirect evidence “DISA is able to provide advice and support to its members utilising the wealth of knowledge contained within the organisation.” Source: RevenueBase Database · checked Sep 20, 2026
14	APT Solutions LTD	Strong evidence	Telford, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Strong evidence “APT provide specialist membership management software and administration services specifically designed for associations to improve engagement with members and enhance back-office…” Source: RevenueBase Database · checked Sep 20, 2026
15	Memberwise Network	Strong evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	1-10	26 contacts →
	Strong evidence “The MemberWise Network the leading independent and free to join professional network of membership and association professionals dedicated to promoting good practice and…” Source: RevenueBase Database · checked Sep 20, 2026
16	OOMI	Strong evidence	Epsom, United KingdomHQ checked Sep 20, 2026	51-200	25 contacts →
	Strong evidence “oomi - complete membership management.” Source: RevenueBase Database · checked Sep 20, 2026
17	Event Leaders Exchange ELX	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	22 contacts →
	Indirect evidence “Event Leaders Exchange, or ELX, is a private professional community that brings together senior corporate event leaders to share ideas and industry insights, discuss issues and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Gatwick Diamond Business	Indirect evidence	Crawley, United KingdomHQ checked Sep 20, 2026	1-10	21 contacts →
	Indirect evidence “Gatwick Diamond Business has been at the very centre of the Gatwick Diamond business community for over 70 years.” Source: RevenueBase Database · checked Sep 20, 2026
19	Manchester LAW Society	Strong evidence	Manchester, United KingdomHQ checked Sep 20, 2026	1-10	21 contacts →
	Strong evidence “We are one of the largest and most active membership organisations in the country, for lawyers and their fee earners, with some members.” Source: RevenueBase Database · checked Sep 20, 2026
20	CHS For Event Professionals	Indirect evidence	York, United KingdomHQ checked Sep 20, 2026	1-10	21 contacts →
	Indirect evidence “At CHS, we're passionate about supporting the meetings and events sector by connecting professionals to innovate, grow, and create extraordinary experiences that leave lasting…” Source: RevenueBase Database · checked Sep 20, 2026
21	Bforb International Networking Clubs	Indirect evidence	Salford, United KingdomHQ checked Sep 20, 2026	1-10	21 contacts →
	Indirect evidence “BforB run enjoyable Networking Clubs, where you can join positive people doing better business week after week.” Source: RevenueBase Database · checked Sep 20, 2026
22	Veryconnect	Strong evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	11-50	20 contacts →
	Strong evidence “Most membership teams are running on tools that were never built for them.” Source: RevenueBase Database · checked Sep 20, 2026
23	Playmoregolf	Strong evidence	Bloxham, United KingdomHQ checked Sep 20, 2026	11-50	20 contacts →
	Strong evidence “PlayMoreGolf is the UK's leading flexible golf membership provider, with over members and 200 partner clubs.” Source: RevenueBase Database · checked Sep 20, 2026
24	Hmca Members	Strong evidence	Knaresborough, United KingdomHQ checked Sep 20, 2026	11-50	19 contacts →
	Strong evidence “Hospital and Medical Care Association is a specialist in offering health benefits exclusively to members of professional & trades associations and membership groups.” Source: RevenueBase Database · checked Sep 20, 2026
25	Moore Engage	Indirect evidence	Sheffield, United KingdomHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “Moore Engage is a trusted provider of outsourced services, dedicated to helping associations, charities, and societies thrive.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: membership organizations. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names membership organizations.
Partial evidence: Its own public description names part of membership organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name membership organizations. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 346 membership organizations based in the United Kingdom

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Membership organizations based in the United Kingdom at a glance

As of Sep 20, 2026

27.5%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

28.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

218

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 346 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among membership organizations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “membership organizations”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names membership organizations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among membership organizations, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 819 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Membership organizations by metro

Membership organizations in London97

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names membership organizations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many membership organizations are there based in the United Kingdom?

RevenueBase identified 346 membership organizations headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Broker Network, headquartered in Knaresborough Knaresborough Harrogate, tops this list with the largest team on record.

Which city has the most membership organizations?

London leads with 97 headquartered companies, followed by Manchester (10) and Birmingham (8).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 819 verified decision-maker contacts tracked across these 346 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.