Company lists · Data refreshed September 2026
Top 25 Quantum consulting firms worldwide
RevenueBase identified 265 quantum consulting firms worldwide as of September 2026 and tracks 5,121 professional contacts across them, including 1,823 with verified work emails and 1,299 with mobile numbers. The United States is the largest market and London the largest hub.
This list covers quantum consulting firms worldwide, 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 5, 2026. Country and city lists for quantum consulting firms follow the table.
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 quantum consulting firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 598 contacts → | ||||
Partial evidence “Science led and enterprise driven, Quantinuum unites Cambridge Quantum’s best-in-class software with Honeywell Quantum Solutions’ high-performing trapped-ion hardware.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 574 contacts → | ||||
Partial evidence “IonQ, Inc.[NYSE: IONQ] is the world’s leading quantum platform and foundry - delivering integrated quantum solutions across computing, networking, sensing, and security.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 546 contacts → | ||||
Partial evidence “HBG is a market intelligence firm offering insightful, validated & high quality qualitative & quantitative research data solutions to clients across the globe.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 335 contacts → | ||||
Indirect evidence “In the tech and data intelligence worlds, a sandbox is where innovation is born.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 292 contacts → | ||||
Partial evidence “Xanadu Quantum Technologies Limited is a Canadian photonic quantum computing company with the mission to build quantum computers that are useful and available to people everywhere.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 252 contacts → | ||||
Partial evidence “Quantum Machines envisions a new technological age.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 211 contacts → | ||||
Partial evidence “Infleqtion, Inc.(NYSE: INFQ) is a global leader in quantum technology, delivering neutral atom solutions for quantum computing, networking, sensing, and security.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 146 contacts → | ||||
Partial evidence “Quantum computing is poised to reshape our world by addressing the complex challenges we face today.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 142 contacts → | ||||
Partial evidence “Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 59 contacts → | ||||
Partial evidence “Vector Atomic is commercializing quantum technology for applications including GPS-free navigation, telecommunications, and computing.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 54 contacts → | ||||
Indirect evidence “At Resonance, we make emerging technologies universally understandable and accessible, helping our clients thrive in a rapidly evolving world.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 50 contacts → | ||||
Partial evidence “1QBit redefines intractable problems by reframing them to achieve superior results using the most effective quantum and classical processors built to date.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 44 contacts → | ||||
Partial evidence “Phasecraft is the quantum algorithms company.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 44 contacts → | ||||
Partial evidence “Quantum AI Global is at the forefront of the quantum revolution, pioneering advancements in both quantum hardware and software.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 34 contacts → | ||||
Partial evidence “SEEQC is developing the first digital quantum computing platform for global businesses.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 31 contacts → | ||||
Indirect evidence “Strangeworks is an unconventional computing software company based in Austin, TX.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 30 contacts → | ||||
Partial evidence “Quant16 is a Financial Performance Intelligence company.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 29 contacts → | ||||
Partial evidence “Cambridge Quantum (CQ), part of Quantinuum, is a quantum computing software and algorithms company, and in essence we solve one critical problem – to allow our customers to get…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 26 contacts → | ||||
Partial evidence “Aliro, The Quantum Networking Company®, offers AliroNet® to run entanglement-based Quantum Networks for applications such as Quantum Secure Communications (QSC), secure access to…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 24 contacts → | ||||
Partial evidence “Powerful new quantum technologies promise tremendous benefits, but also pose serious threats to cybersecurity.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 24 contacts → | ||||
Partial evidence “Entanglement is a next-generation artificial intelligence company fusing quantum computing with machine learning to solve previously unsolvable problems to drive human advancement.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 23 contacts → | ||||
Partial evidence “Qulabs is one of the first company in India in Quantum computing ecosystem.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 21 contacts → | ||||
Partial evidence “Artisan Healthcare Consulting is a management consulting firm that provides strategic insights to healthcare product companies.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 20 contacts → | ||||
Partial evidence “Atlantic Quantum is now part of Google Quantum AI.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 19 contacts → | ||||
Partial evidence “Next Gen Quantum Computing, AI & App Development Company” Source: RevenueBase Database · checked Sep 5, 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: quantum 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 quantum consulting firms.
- Partial evidence
- Its own public description names part of quantum consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name quantum 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 265 quantum consulting firms worldwide
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Quantum consulting firms worldwide at a glance
As of Sep 5, 2026Companies by employee count
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 quantum 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.
- Coverage
- 4 countries, largest first: the United States, the United Kingdom, India, Canada. Country and city lists for quantum consulting firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “quantum 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 quantum 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 quantum consulting firms, and records with no verified work email.
- 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, 1,823 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 between September 5, 2026 and September 14, 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.
Quantum consulting firms by location
5 lists · largest firstEvery Quantum consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Quantum consulting firms based in the United States138
- Quantum consulting firms based in the United Kingdom52
- Quantum consulting firms based in India49
- Quantum consulting firms based in Canada26
Cities
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 quantum 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 quantum consulting firms are there worldwide?
RevenueBase identified 265 quantum consulting firms worldwide 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?
Quantinuum, headquartered in Broomfield, tops this list with the largest team on record.
Which country has the most quantum consulting firms?
The United States leads with 138 companies, followed by the United Kingdom (52) and India (49). Every quantum consulting firms list by country and city is linked on this page.
Which city has the most quantum consulting firms?
London leads with 32 headquartered companies, followed by Hyderabad (10) and New York (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 1,823 verified decision-maker contacts tracked across these 265 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 5, 2026 and September 14, 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.