Company lists · Data refreshed September 2026

Top 24 B2B event agencies based in London, United Kingdom

Name: B2B event agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 782 companies tracked

RevenueBase identified 782 B2B event agencies headquartered in London, United Kingdom as of September 2026 and tracks 14,951 professional contacts across them, including 4,371 with verified work emails. London is the largest hub.

This list covers B2B event agencies headquartered in London, 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 21, 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 21, 2026 86% judged on-target in blind review

782Companies

14,951Contacts tracked

4,371Verified emails

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The 24 largest B2B event agencies based in London, United Kingdom

Ranked by team size

Top 24 of 782 B2B event agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to B2B event agencies: 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	Clarion Events	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	769 contacts →
	Partial evidence “Clarion Events is the world's largest privately owned event and exhibition organiser, known for our innovative approach, market-leading super brands and digital products.” Source: RevenueBase Database · checked Sep 21, 2026
2	Hyve Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	590 contacts →
	Indirect evidence “When people come together, powerful things happen.” Source: RevenueBase Database · checked Sep 21, 2026
3	Closerstill Media	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	554 contacts →
	Indirect evidence “At CloserStill, we strive to deliver the best.” Source: RevenueBase Database · checked Sep 21, 2026
4	UBM PLC	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	507 contacts →
	Strong evidence “UBM combined with Informa in June 2018, creating a single, leading B2B information services group, and the largest B2B events and exhibitions organiser in the world.” Source: RevenueBase Database · checked Sep 21, 2026
5	Entourage	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	370 contacts →
	Indirect evidence “In a world where everyone’s shouting the same thing, whisper something truly distinctive in all the right ears.” Source: RevenueBase Database · checked Sep 21, 2026
6	Transmission	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	289 contacts →
	Partial evidence “We deliver full-service B2B marketing solutions for world-class customer experiences – with an eye always toward the future.” Source: RevenueBase Database · checked Sep 21, 2026
7	Event Concept	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	275 contacts →
	Partial evidence “Event Concept is a creative event agency and production company.” Source: RevenueBase Database · checked Sep 21, 2026
8	Elevate Global	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	254 contacts →
	Indirect evidence “Elevate Global is the award-winning staffing partner for brand experiences, named Staffing Agency of the Year at the Campaign Experience Awards 2025.” Source: RevenueBase Database · checked Sep 21, 2026
9	Montgomery Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	246 contacts →
	Indirect evidence “To serve our world, nurturing relationships and developing opportunities” We are Montgomery Group.” Source: RevenueBase Database · checked Sep 21, 2026
10	People	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	142 contacts →
	Indirect evidence “We believe in the power of shared experience to transform lives and shape culture.” Source: RevenueBase Database · checked Sep 21, 2026
11	Reuters Events	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	10001+	141 contacts →
	Partial evidence “Reuters Events is part of the Reuters News division of Thomson Reuters.” Source: RevenueBase Database · checked Sep 21, 2026
12	Publicis PRO	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	139 contacts →
	Partial evidence “Publicis Pro is the specialist B2B marketing agency within Publicis Groupe, the world's number one marketing holding group.” Source: RevenueBase Database · checked Sep 21, 2026
13	Strata	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	132 contacts →
	Indirect evidence “Strata is an award-winning agency crafting unforgettable brand experiences through a multi-layered offering.” Source: RevenueBase Database · checked Sep 21, 2026
14	Tarsus Group	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	115 contacts →
	Strong evidence “Tarsus Group delivers B2B events across the globe along with digital media & industry-focussed publications.” Source: RevenueBase Database · checked Sep 21, 2026
15	Vostock Capital UK	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	112 contacts →
	Indirect evidence “Vostock Capital is an international organiser of industry congresses and conferences that accelerate market growth and help companies find partners, clients, and investment…” Source: RevenueBase Database · checked Sep 21, 2026
16	Tba. Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	110 contacts →
	Indirect evidence “We turn big ideas into brand experiences that stir emotions, change perceptions, fuel conversations and inspire action.” Source: RevenueBase Database · checked Sep 21, 2026
17	Kisaco Research	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	101 contacts →
	Indirect evidence “Kisaco Research works with the early adopters and leaders of growth markets in driving their respective industries forward and in providing the right knowledge, learning and…” Source: RevenueBase Database · checked Sep 21, 2026
18	Arena International Events Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	98 contacts →
	Partial evidence “Arena International Events Group provides a comprehensive range of event platforms for multiple industry sectors.” Source: RevenueBase Database · checked Sep 21, 2026
19	Seen Presents	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	95 contacts →
	Partial evidence “Campaign Experience Awards: Creative Experience Agency of the Year (small) 2025 Event Team of the Year 2023 & 2024 The Drum: Leader of the Year 2023 Creativepool: Small Agency of…” Source: RevenueBase Database · checked Sep 21, 2026
20	ARC Network	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	90 contacts →
	Strong evidence “Arc is a B2B events, data, and media platform, backed by investment funds managed by EagleTree Capital.” Source: RevenueBase Database · checked Sep 21, 2026
21	Worldwide Business Research	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	88 contacts →
	Indirect evidence “Driving Innovation - One Connection at a Time: We run over 100 industry leading, annual conferences worldwide, along with a full complement of content marketing services, and…” Source: RevenueBase Database · checked Sep 21, 2026
22	BBN	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	86 contacts →
	Partial evidence “THIS IS B2B WITHOUT BORDERS THIS IS BBN BBN breaks boundaries.” Source: RevenueBase Database · checked Sep 21, 2026
23	Ingenuity	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	82 contacts →
	Indirect evidence “Ingenuity creates new business relationships between Agencies and Brands For Agencies: We help them find, meet and win new clients through content & insight led Lead Generation…” Source: RevenueBase Database · checked Sep 21, 2026
24	AZTEC	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	76 contacts →
	Partial evidence “We specialise in creating exceptional live events across the UK and Europe, with a strong emphasis on enhancing the audience experience.” Source: RevenueBase Database · checked Sep 21, 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: B2B event agencies. 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 B2B event agencies.
Partial evidence: Its own public description names part of B2B event agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name B2B event agencies. 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 24 of 782 B2B event agencies based in London, United Kingdom

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B2B event agencies based in London, United Kingdom at a glance

As of Sep 21, 2026

29.2%Verified-email coverage

19.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

479

11-50

209

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 782 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 B2B event agencies, 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 London, United Kingdom whose own description of what they do matches “B2B event agencies”. 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 B2B event agencies), 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 B2B event agencies, and records with no verified work email. Companies headquartered outside London 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, 4,371 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 21, 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.

B2B event agencies by metro in the United Kingdom

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 B2B event agencies, 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 B2B event agencies are there based in London, United Kingdom?

RevenueBase identified 782 B2B event agencies headquartered in London, 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?

Clarion Events, headquartered in London, tops this list with the largest team on record.

Which city has the most B2B event agencies?

London leads with 782 headquartered companies, followed by Manchester (60) and Bristol (55).

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 4,371 verified decision-maker contacts tracked across these 782 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 21, 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.