Company lists · Data refreshed September 2026

Top 25 Phase i clinical trial organizations based in the United Kingdom

Name: Phase i clinical trial 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 17, 2026 155 companies tracked

RevenueBase identified 155 phase i clinical trial organizations headquartered in the United Kingdom as of September 2026 and tracks 6,368 professional contacts across them, including 2,294 with verified work emails. London is the largest hub.

This list covers phase i clinical trial 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 17, 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 17, 2026 86% judged on-target in blind review

155Companies

6,368Contacts tracked

2,294Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest phase i clinical trial organizations based in the United Kingdom

Ranked by team size

Top 25 of 155 phase i clinical trial organizations based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to phase i clinical trial 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	Perceptive INC	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,197 contacts →
	Partial evidence “Expanding on their combined 50-year history, Perceptive provides best-in-class specialist support to global pharmaceutical, biotech, and clinical research organizations, spanning…” Source: RevenueBase Database · checked Sep 17, 2026
2	MAC Clinical Research	Strong evidence	Blackpool, United KingdomHQ checked Sep 17, 2026	201-500	333 contacts →
	Strong evidence “MAC Clinical Research is a leading full-service, global Contract Research Organisation (CRO) with over 30 years of experience in clinical trial management.” Source: RevenueBase Database · checked Sep 17, 2026
3	WEP Clinical	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	321 contacts →
	Strong evidence “At WEP Clinical, we operate as a specialist CRO with a proven track record of excellence in designing, managing, and executing Clinical Trials, Expanded Access Programs (EAPs)…” Source: RevenueBase Database · checked Sep 17, 2026
4	Simbec-Orion	Indirect evidence	Merthyr Tydfil, United KingdomHQ checked Sep 17, 2026	201-500	312 contacts →
	Indirect evidence “Our passion for improving patients’ lives motivates us to apply our skills, experience, and knowledge to advance medicine.” Source: RevenueBase Database · checked Sep 17, 2026
5	Hammersmith Medicines Research LTD	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	230 contacts →
	Indirect evidence “HMR is a Contract Research Organisation (CRO).” Source: RevenueBase Database · checked Sep 17, 2026
6	HVIVO	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	214 contacts →
	Strong evidence “hVIVO plc (Ticker: HVO) is a science‑led early‑phase drug development company purpose‑built to meet the growing complexity of modern clinical research.” Source: RevenueBase Database · checked Sep 17, 2026
7	Richmond Pharmacology	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	198 contacts →
	Indirect evidence “At Richmond, we're on a mission to transform healthcare by delivering faster answers and turning hope into tangible solutions.” Source: RevenueBase Database · checked Sep 17, 2026
8	Medicines Evaluation Unit Ltd, An Iqvia Business	Indirect evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	97 contacts →
	Indirect evidence “The Medicines Evaluation Unit (MEU) Ltd, an IQVIA business, is one of the UK’s leading contract research organisations, a facility where commitment to excellence is paramount.” Source: RevenueBase Database · checked Sep 17, 2026
9	Innovative Trials	Partial evidence	Letchworth Garden City, United KingdomHQ checked Sep 17, 2026	51-200	95 contacts →
	Partial evidence “Innovative Trials was built around a simple belief, patient recruitment works better when people feel supported.” Source: RevenueBase Database · checked Sep 17, 2026
10	NWEH	Strong evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	57 contacts →
	Strong evidence “At NWEH, we develop cutting-edge, technology-driven platforms that harness real-world data to transform clinical trials.” Source: RevenueBase Database · checked Sep 17, 2026
11	Protas	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	57 contacts →
	Strong evidence “Protas is transforming clinical trials for the benefit of patients worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
12	BDD	Partial evidence	84 Castle Street, United KingdomHQ checked Sep 17, 2026	51-200	46 contacts →
	Partial evidence “BDD combines drug delivery expertise and clinical capabilities to accelerate product development pipelines, enable life cycle management and create new value-added products.” Source: RevenueBase Database · checked Sep 17, 2026
13	Biotec Services International, A PCI Company	Indirect evidence	Bridgend, United KingdomHQ checked Sep 17, 2026	11-50	44 contacts →
	Indirect evidence “Biotec Services International has recently been acquired by PCI Services, please visit the PCI company page for more information.” Source: RevenueBase Database · checked Sep 17, 2026
14	ARC Regulatory	Strong evidence	Belfast, United KingdomHQ checked Sep 17, 2026	11-50	42 contacts →
	Strong evidence “ARC's purpose is to expedite access to precision medicine clinical trials for patients globally.” Source: RevenueBase Database · checked Sep 17, 2026
15	Ellipses Pharma	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	40 contacts →
	Partial evidence “Ellipses Pharma is an international drug development company, focused exclusively on the advancement of innovative cancer treatments through the clinic.” Source: RevenueBase Database · checked Sep 17, 2026
16	Esms Global LTD	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	39 contacts →
	Indirect evidence “Described as "A centre of excellence" by the MHRA - ESMS Global LTD, formerly part of the Guy’s Poisons Unit, is a niche service provider based in central London.” Source: RevenueBase Database · checked Sep 17, 2026
17	Sylphid Analytics	Partial evidence	Reading, United KingdomHQ checked Sep 17, 2026	51-200	37 contacts →
	Partial evidence “Sylphid Analytics is a specialized Clinical Research Organization (CRO) delivering high-quality, end-to-end support to the Pharmaceutical and Biopharmaceutical industries.” Source: RevenueBase Database · checked Sep 17, 2026
18	Clinvigilant Research	Indirect evidence	Dartford, United KingdomHQ checked Sep 17, 2026	51-200	25 contacts →
	Indirect evidence “Clinvigilant Research is a leading provider of comprehensive services to the life sciences industry, specializing in Contract Research Organization (CRO) services, eClinical…” Source: RevenueBase Database · checked Sep 17, 2026
19	Accelerating Clinical Trials LTD	Indirect evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	11-50	24 contacts →
	Indirect evidence “A not-for-profit company, any surplus income is reinvested for blood cancer patients’ benefit.” Source: RevenueBase Database · checked Sep 17, 2026
20	Research Organisation KC LTD	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	23 contacts →
	Strong evidence “ROKC is an innovative CRO specialising in the bespoke design, management and delivery of Pan European multi-centre clinical trials to commercial, academic and non governmental…” Source: RevenueBase Database · checked Sep 17, 2026
21	Cro-Solutions , An Iqvia Business	Strong evidence	Wythenshawe, United KingdomHQ checked Sep 17, 2026	11-50	19 contacts →
	Strong evidence “We are proud to offer our clients a single solution for our clients' clinical trial programmes.” Source: RevenueBase Database · checked Sep 17, 2026
22	QRC Consultants LTD	Partial evidence	St Ives, United KingdomHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “WHO WE ARE QRC Consultants Ltd is a team of experienced QA, regulatory and clinical research professionals, dedicated to providing high quality, practical, responsive and cost…” Source: RevenueBase Database · checked Sep 17, 2026
23	Pharmexcel	Strong evidence	Welwyn Garden City, United KingdomHQ checked Sep 17, 2026	11-50	18 contacts →
	Strong evidence “PHARMExcel is an award-winning, ISO 9001:2015 certified, full-service Contract Research Organisation (CRO) providing a flexible and innovative approach to clinical trial delivery.” Source: RevenueBase Database · checked Sep 17, 2026
24	Cyte Global	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	18 contacts →
	Indirect evidence “CYTE is an innovative, contract research organisation (CRO) specialising in cardiovascular disease.” Source: RevenueBase Database · checked Sep 17, 2026
25	Alcyomics	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 17, 2026	11-50	15 contacts →
	Partial evidence “Alcyomics is a specialist clinical research organization (CRO) supporting the pharmaceutical, biotechnology, and cosmetics industries.” Source: RevenueBase Database · checked Sep 17, 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: phase i clinical trial 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 phase i clinical trial organizations.
Partial evidence: Its own public description names part of phase i clinical trial organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name phase i clinical trial 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 155 phase i clinical trial organizations based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,294 reachable decision-makers.

Free signup · no credit card

View the full list →

Phase i clinical trial organizations based in the United Kingdom at a glance

As of Sep 17, 2026

36.0%Verified-email coverage

41.1Average contacts per company

11-50Median size (employees)

29.0%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 155 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 phase i clinical trial 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 “phase i clinical trial 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 phase i clinical trial 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 phase i clinical trial 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, 2,294 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 17, 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.

Phase i clinical trial organizations by metro

Phase i clinical trial organizations in London45

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 phase i clinical trial 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 phase i clinical trial organizations are there based in the United Kingdom?

RevenueBase identified 155 phase i clinical trial 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?

Perceptive INC, headquartered in London, tops this list with the largest team on record.

Which city has the most phase i clinical trial organizations?

London leads with 45 headquartered companies, followed by Glasgow (8) and Manchester (7).

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 2,294 verified decision-maker contacts tracked across these 155 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 17, 2026.

Ready to reach these companies? Verified emails and direct dials for all 155 phase i clinical trial organizations based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Phase i clinical trial organizations by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Phase i clinical trial organizations lists · New lists

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.