Company lists · Data refreshed September 2026
Top 25 Lean six sigma consulting firms based in the United Kingdom
RevenueBase identified 237 lean six sigma consulting firms headquartered in the United Kingdom as of September 2026 and tracks 1,283 professional contacts across them, including 196 with verified work emails. London is the largest hub.
This list covers lean six sigma consulting firms 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 28, 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.
The 25 largest lean six sigma consulting firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 84 contacts → | ||||
Partial evidence “With Simpler as your lean-transformation partner, you can achieve long-term success.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 2 | 34 contacts → | ||||
Indirect evidence “We are a highly respected training and consultancy organisation specialising in business and process improvement with over 30 years experience of developing practical, performance…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 3 | 20 contacts → | ||||
Indirect evidence “We are passionate about improving our client’s operations.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 4 | 18 contacts → | ||||
Strong evidence “Kaizen Consultancy & Training Services Based on the Wirral, UK Help manufacturers continually improve Application of Lean, Six Sigma & Total Productive Maintenance (TPM) Proven…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 5 | 16 contacts → | ||||
Indirect evidence “Our goal is to help organisations run more effective management systems, improve the quality of their products and services, and support them in achieving their own goals.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 6 | 15 contacts → | ||||
Indirect evidence “Unlocking Organisational Excellence Project7 (P7C) are Global Performance Improvement Specialists, transforming organisations by rapidly solving business problems and delivering…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 7 | 12 contacts → | ||||
Indirect evidence “If you’re fed up with your business not operating at it’s full potential, then you’re not alone.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 8 | 11 contacts → | ||||
Partial evidence “Lean Coaching was established in 2002 to satisfy a growing need for specialists capable not just of making recommendations (Know-What) but also of leading clients through the…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 9 | 10 contacts → | ||||
Partial evidence “Complete lean solutions are hands on business improvement specialists.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 10 | 8 contacts → | ||||
Partial evidence “Meet Breakthrough Partners Over multiple decades, the Breakthrough Partners team has successfully supported the implementation of Lean Business Systems in 40+ global organisations.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 11 | 8 contacts → | ||||
Indirect evidence “Formed in 2009 we bring together the extensive expertise and experience of Project and Programme Delivery with Business and Operational Transformation to provide a new and…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 12 | 8 contacts → | ||||
Strong evidence “The Six Sigma Management Institute was founded by Dr.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 13 | 8 contacts → | ||||
Indirect evidence “At PBI, we don’t just teach transformation, we deliver it.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 contacts → | ||||
Strong evidence “Lean Six Sigma Training Ltd is an international Lean Six Sigma training provider based in the UK.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 15 | 7 contacts → | ||||
Strong evidence “HHAcademy sviluppa e certifica competenze di EXecutional EXcellence- miglioramento continuo- riduzione della variabilità di processo (six sigma)- aggressione delle attività senza…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 16 | 6 contacts → | ||||
Strong evidence “We’re proud to announce our work with food and packaging industries around the world to improve productivity and drive continuous improvement using lean 6 sigma methodologies…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 17 | 6 contacts → | ||||
Indirect evidence “Aspen Global has an impressive pedigree.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 contacts → | ||||
Indirect evidence “We are a boutique consultancy specialising in helping businesses succeed.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 19 | 5 contacts → | ||||
Indirect evidence “We work with clients to reduce the time and cost of completing complex processes and tasks on large projects.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 20 | 5 contacts → | ||||
Partial evidence “Nishtha Business Services Limited (NBSL) is a Management Consulting firm; a one-stop solution for Strategic, Operational, Digital, Learning & Development services, specialising in…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 contacts → | ||||
Partial evidence “Our aim at Learning4Leaders is to help you increase your organisation’s Operational Excellence, profitability and prosperity through tried and tested Lean tools and techniques.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 contacts → | ||||
Strong evidence “We provide Lean Six Sigma training courses to Introductory, Champion, Yellow Belt, Green Belt, Black Belt and Master Black Belt (MBB) certification levels facilitate the drive for…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 contacts → | ||||
Indirect evidence “At Castlefirth, our mission is to enable efficient and effective organisations by building breakthrough improvement strategies that reduce costs, improve performance, and drive…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 contacts → | ||||
Indirect evidence “MPL is a consultancy specialising in improving organisational and operational performance through the introduction of best practice, cultural and behavioural change.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 contacts → | ||||
Partial evidence “Vetsa Consulting Services Ltd.(VCSL) is a boutique transformation consulting firm helping organisations improve operational efficiency and deliver complex transformation…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
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: lean six sigma consulting firms. 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 lean six sigma consulting firms.
- Partial evidence
- Its own public description names part of lean six sigma consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name lean six sigma consulting firms. 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 237 lean six sigma consulting firms based in the United Kingdom
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Lean six sigma consulting firms based in the United Kingdom at a glance
As of Sep 28, 2026Companies by employee count
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 237 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 lean six sigma consulting firms, 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 “lean six sigma consulting firms”. 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 lean six sigma consulting firms), 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 lean six sigma consulting firms, 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, 196 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 28, 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.
Lean six sigma consulting firms by metro
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 lean six sigma consulting firms, 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 lean six sigma consulting firms are there based in the United Kingdom?
RevenueBase identified 237 lean six sigma consulting firms 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?
Simpler Consulting, An IBM Company, headquartered in London, tops this list with the largest team on record.
Which city has the most lean six sigma consulting firms?
London leads with 39 headquartered companies, followed by Glasgow (5) and Bristol (4).
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 196 verified decision-maker contacts tracked across these 237 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 28, 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.
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