Company lists · Data refreshed September 2026

Top 25 Market research agencies based in London, United Kingdom

Name: Market research 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 13, 2026 248 companies tracked

RevenueBase identified 248 market research agencies headquartered in London, United Kingdom as of September 2026 and tracks 7,644 professional contacts across them, including 2,738 with verified work emails and 757 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers market research 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 13, 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 13, 2026 86% judged on-target in blind review

248Companies

7,644Contacts tracked

2,738Verified emails

757Mobile numbers

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The 25 largest market research agencies based in London, United Kingdom

Ranked by team size

Top 25 of 248 market research agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to market research 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	Ipsos In The UK	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	1,621 contacts →
	Indirect evidence “In our world of rapid change, the need for reliable information to make confident decisions has never been greater.” Source: RevenueBase Database · checked Sep 13, 2026
2	Mintel	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	1,475 contacts →
	Indirect evidence “At Mintel, we empower businesses to navigate the future with confidence.” Source: RevenueBase Database · checked Sep 13, 2026
3	Consulting By Kantar	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	501-1,000	502 contacts →
	Partial evidence “Kantar is the world’s leading marketing data and analytics company.” Source: RevenueBase Database · checked Sep 13, 2026
4	Savanta	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	501-1,000	464 contacts →
	Strong evidence “Savanta is a fast-growing data, market research and advisory company.” Source: RevenueBase Database · checked Sep 13, 2026
5	IFF Research	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	420 contacts →
	Strong evidence “Established in 1965, IFF is a social and market research agency who helps people make better informed decisions.” Source: RevenueBase Database · checked Sep 13, 2026
6	Ronin International	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	312 contacts →
	Strong evidence “RONIN International is an independent B2B market research company specialising in business, healthcare and tech studies.” Source: RevenueBase Database · checked Sep 13, 2026
7	Kudos Research	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	n/a	213 contacts →
	Strong evidence “Kudos Research has been providing high value, competitively priced, market research services to both internal and external clients since 1986.” Source: RevenueBase Database · checked Sep 13, 2026
8	B2B International	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	178 contacts →
	Strong evidence “The world’s most experienced B2B market research company.” Source: RevenueBase Database · checked Sep 13, 2026
9	MRS	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	147 contacts →
	Strong evidence “Where Evidence Matters I The Market Research Society (MRS) is the world’s leading research association, driven by the principle that evidence matters.” Source: RevenueBase Database · checked Sep 13, 2026
10	Strat7 Researchbods	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	106 contacts →
	Partial evidence “Researchbods delivers insight that drives action for ambitious brands.” Source: RevenueBase Database · checked Sep 13, 2026
11	Opinium Insights With Impact	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	104 contacts →
	Strong evidence “Opinium is a multi-award-winning strategic insight agency, twice recognised Market Research Society (MRS)'Agency of the Year' in the past five years.” Source: RevenueBase Database · checked Sep 13, 2026
12	Censuswide	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	71 contacts →
	Strong evidence “Censuswide is a consultancy that specialises in quantitative and qualitative market research for PR, marketing and insight purposes.” Source: RevenueBase Database · checked Sep 13, 2026
13	MASMI	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	69 contacts →
	Strong evidence “MASMI is a full-service international market research company with broad industry expertise specialising in delivering research insights and decision support, based on state of…” Source: RevenueBase Database · checked Sep 13, 2026
14	Perspective Research Services	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	68 contacts →
	Indirect evidence “Perspective is now part of Ipsos, and using the Ipsos brand name, following acquisition in June 2025.” Source: RevenueBase Database · checked Sep 13, 2026
15	The Nursery Research & Planning	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	66 contacts →
	Partial evidence “Research that helps brands glow and grow’ is the simple expression of everything we do.” Source: RevenueBase Database · checked Sep 13, 2026
16	Serrula Research	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	47 contacts →
	Strong evidence “Serrula Research is a London based market research agency specialising in recruitment, expert network sourcing, and tailored fieldwork.” Source: RevenueBase Database · checked Sep 13, 2026
17	Sapio Research	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	40 contacts →
	Strong evidence “We’re a Certified B Corp™, full-service market research agency based in London, and we're experts in B2B & Technology market research.” Source: RevenueBase Database · checked Sep 13, 2026
18	Potentia Insight	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	40 contacts →
	Strong evidence “We’re an award-winning digital market research agency helping clients make fast, confident decisions with high-quality data they can trust.” Source: RevenueBase Database · checked Sep 13, 2026
19	Precision Business Insights	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	37 contacts →
	Strong evidence “Precision Business Insights is one of the leading market research and business consulting firm, which follow a holistic approach to solve the client needs.” Source: RevenueBase Database · checked Sep 13, 2026
20	RSMB	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	35 contacts →
	Indirect evidence “RSMB was established in 1987 to offer high quality design and operations in the field of television audience measurement.” Source: RevenueBase Database · checked Sep 13, 2026
21	Davies Mckerr	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	33 contacts →
	Partial evidence “Iconic brands can’t afford flat research in today’s world.” Source: RevenueBase Database · checked Sep 13, 2026
22	Teamvisory	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	29 contacts →
	Strong evidence “Teamvisory is a global full-service market research and data collection company offering quantitative and qualitative research solutions across international markets.” Source: RevenueBase Database · checked Sep 13, 2026
23	Accent MR	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	29 contacts →
	Strong evidence “Accent is a full service market research consultancy delivering innovative, tailored and targeted insight.” Source: RevenueBase Database · checked Sep 13, 2026
24	Leftfield	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	27 contacts →
	Strong evidence “Leftfield is an independent market research fieldwork agency operating globally from our offices in London, Amsterdam and Pune.” Source: RevenueBase Database · checked Sep 13, 2026
25	Research In Finance	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	25 contacts →
	Strong evidence “Research In Finance is an award winning market research and business information provider that specialises in the financial services market.” Source: RevenueBase Database · checked Sep 13, 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: market research 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 market research agencies.
Partial evidence: Its own public description names part of market research agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name market research 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 25 of 248 market research agencies based in London, United Kingdom

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Market research agencies based in London, United Kingdom at a glance

As of Sep 13, 2026

35.8%Verified-email coverage

9.9%Mobile-number coverage

30.8Average contacts per company

1-10Median size (employees)

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

134

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

2,1600–30

53931–60

1061–90

190–180

28180+

Company record updated

Median 77.0d

00–30

2,60931–60

3,72461–90

92690–180

385180+

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 market research 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 “market research 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 market research 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 market research 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, 2,738 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 13, 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.

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 market research 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 market research agencies are there based in London, United Kingdom?

RevenueBase identified 248 market research 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?

Ipsos In The UK, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most market research agencies?

London leads the United Kingdom with 248 headquartered companies, followed by Manchester (14) and Leeds (10).

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 2,738 verified decision-maker contacts tracked across these 248 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 13, 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.