Company lists · Data refreshed September 2026
Top 25 Six sigma consulting companies based in the United States
RevenueBase identified 455 six sigma consulting companies headquartered in the United States as of September 2026 and tracks 2,019 professional contacts across them, including 452 with verified work emails. Houston is the largest hub.
This list covers six sigma consulting companies headquartered in the United States, 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 22, 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 six sigma consulting companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 216 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 2 | 178 contacts → | ||||
Strong evidence “Lean Six Sigma Institute provides comprehensive training and consulting services designed to help organizations navigate the challenges of today’s global marketplace.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 3 | 53 contacts → | ||||
Partial evidence “PCG Consulting Group offers preeminent results for B2B clients in Technology, Healthcare, Call Center, Collections, Location Services and Skip tracing sectors.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 4 | 44 contacts → | ||||
Strong evidence “Get the latest insights on Lean Six Sigma, process modeling, and continuous improvement delivered straight to your inbox.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 5 | 39 contacts → | ||||
Strong evidence “Experts in Lean Six Sigma Training, Consulting, and Deployments targeting Breakthrough in Business Transformation, Optimization and Business Terraforming The Dr.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 6 | 36 contacts → | ||||
Indirect evidence “The Phoenix Group Drives Process Improvement and Operational Excellence at Your Organization The Phoenix Group delivers lasting change with organizations we partner with.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 7 | 29 contacts → | ||||
Partial evidence “Different from most large firms, Kaeppel Consulting offers customized solutions to meet your needs without all the overhead.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 8 | 28 contacts → | ||||
Strong evidence “HKPO is a Small, Woman-Owned business founded in 2006 with a mission to train and support our clients on how to continuously improve and Change for the Better using Lean Six Sigma…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 9 | 27 contacts → | ||||
Partial evidence “MRC provides strategic business consulting assistance and identifies resource options to help manufacturers develop strategies to grow their business.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 10 | 27 contacts → | ||||
Indirect evidence “VISIT OUR WEBSITE: Quality Support Group Inc.(QSG) has been helping organizations achieve their core objectives since 1993.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 11 | 19 contacts → | ||||
Partial evidence “Competitive Business Solutions consultants are masters of world-class operating and lean sigma principles.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 12 | 16 contacts → | ||||
Partial evidence “At Firefly Consulting, we provide custom solutions, leveraging unique methodologies.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 13 | 16 contacts → | ||||
Indirect evidence “EPIC operates with professionals who have the knowledge – and scars – that comes from being in the frontline and in the boardroom, leading teams and implementing solutions.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 14 | 16 contacts → | ||||
Indirect evidence “GLSS empowers everyone with Ethical Efficiency™.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 15 | 14 contacts → | ||||
Partial evidence “Dillon Morgan Consulting (DMC) is an industry leading management consulting firm with experience in helping companies identify efficiencies, reduce their bottom-line costs, and…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 16 | 13 contacts → | ||||
Indirect evidence “Meliora Partners provides continuous improvement expertise to small, mid-sized, and large companies with service offerings including improvement project coaching & support…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 17 | 12 contacts → | ||||
Indirect evidence “We help our clients to design robust solutions to their toughest business problems - lowering cost and enabling process capabilities – ensuring dramatically improved, sustainable…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 18 | 12 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 19 | 11 contacts → | ||||
Partial evidence “The Beneva Group is strategically focused on delivering full-service executive placement and consulting solutions to a broad range of clients throughout the U.S.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 20 | 11 contacts → | ||||
Indirect evidence “The Luminous Group helps Engineering, Operations, Quality and Purchasing leaders of companies who are faced with challenges such as- Costly quality problems that are found too…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 21 | 10 contacts → | ||||
Indirect evidence “Since 1986, QC Training Services, Inc, has provided public and on-site training seminars, workshops and quality consultation to customers across North America.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 contacts → | ||||
Indirect evidence “We provide customized staffing solutions that strengthen workforce capabilities, improve performance, and support organizational growth.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 23 | 10 contacts → | ||||
Indirect evidence “By preventing failure, we can help avoid warranty claims, costly repairs and embarrassment.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 24 | 10 contacts → | ||||
Partial evidence “Get results in half the time.” This is the vision of RCI Consulting.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 25 | 9 contacts → | ||||
Indirect evidence “Magnified Learning® offers the groundbreaking Cohesive Value Transformation™ (CVT) model to transform your organization from good to great.” Source: RevenueBase Database · checked Sep 22, 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: six sigma consulting companies. 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 six sigma consulting companies.
- Partial evidence
- Its own public description names part of six sigma consulting companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name six sigma consulting companies. 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 455 six sigma consulting companies based in the United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 452 reachable decision-makers.
Free signup · no credit card
Six sigma consulting companies based in the United States at a glance
As of Sep 22, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 455 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 six sigma consulting companies, 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 States whose own description of what they do matches “six sigma consulting companies”. 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 six sigma consulting companies), 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 six sigma consulting companies, and records with no verified work email. Companies headquartered outside United States 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, 452 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 22, 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 six sigma consulting companies, 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 six sigma consulting companies are there based in the United States?
RevenueBase identified 455 six sigma consulting companies headquartered in the United States 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?
Omnex INC, headquartered in Ann Arbor, tops this list with the largest team on record.
Which city has the most six sigma consulting companies?
Houston leads with 13 headquartered companies, followed by Atlanta (11) and Dallas (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 452 verified decision-maker contacts tracked across these 455 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 22, 2026.
Ready to reach these companies? Verified emails and direct dials for all 455 six sigma consulting companies based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Six sigma consulting companies by geography
- Six sigma consulting companies based in Australia
- Six sigma consulting companies based in Brazil
- Six sigma consulting companies based in Canada
- Six sigma consulting companies based in France
- Six sigma consulting companies based in Germany
- Six sigma consulting companies based in India
- Six sigma consulting companies based in the Netherlands
- Six sigma consulting companies based in the United Kingdom
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Six sigma consulting companies based in Australia
- Six sigma consulting companies based in Brazil
- Six sigma consulting companies based in Canada
- Six sigma consulting companies based in France
- Six sigma consulting companies based in Germany
- Six sigma consulting companies based in India