Company lists · Data refreshed September 2026
Top 25 Quantum cloud computing companies based in the United States
RevenueBase identified 74 quantum cloud computing companies headquartered in the United States as of September 2026 and tracks 2,974 professional contacts across them, including 1,340 with verified work emails and 1,131 with mobile numbers. Palo Alto is the largest hub.
This list covers quantum cloud computing 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 cloud computing companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | QuantinuumPartial evidence | 598 | |||
“Science led and enterprise driven, Quantinuum unites Cambridge Quantum’s best-in-class software with Honeywell Quantum Solutions’ high-performing trapped-ion hardware.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | IONQStrong evidence | 574 | |||
“IonQ, Inc.[NYSE: IONQ] is the world’s leading quantum platform and foundry - delivering integrated quantum solutions across computing, networking, sensing, and security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Quantum MachinesPartial evidence | 252 | |||
“Quantum Machines envisions a new technological age.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | InfleqtionStrong evidence | 211 | |||
“Infleqtion, Inc.(NYSE: INFQ) is a global leader in quantum technology, delivering neutral atom solutions for quantum computing, networking, sensing, and security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Rigetti ComputingStrong evidence | 171 | |||
“Rigetti is a pioneer in full-stack quantum computing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | Quera Computing INCStrong evidence | 142 | |||
“Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 96 | ||||
“We build scalable quantum computers with atomic arrays that empower our customers to achieve computational breakthroughs.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Quantum Computing INCStrong evidence | 87 | |||
“Quantum Computing Inc.(Nasdaq: QUBT) is a quantum optics and integrated photonics company focused on delivering accessible, scalable, and cost-effective quantum machines and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 38 | ||||
“QC Ware is a quantum computing software company building enterprise solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Theta NetworkPartial evidence | 37 | |||
“Theta Labs is the leading decentralized cloud for AI, media and entertainment and where the world's compute comes together.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | SEEQCStrong evidence | 34 | |||
“SEEQC is developing the first digital quantum computing platform for global businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | StrangeworksPartial evidence | 31 | |||
“Strangeworks is an unconventional computing software company based in Austin, TX.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 26 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | HAIQUPartial evidence | 21 | |||
“Haiqu is a quantum software company developing a new application execution stack for all modalities of near-term quantum computers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 20 | ||||
“Atlantic Quantum is now part of Google Quantum AI.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | QbraidStrong evidence | 19 | |||
“qBraid is the quantum cloud connecting developers, researchers, enterprises, and hardware partners.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 17 | ||||
“BlueQubit builds first-in-class quantum software for current and upcoming quantum computers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 9 | ||||
“Automatski is a Computing Firm at its core.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Quantum Catalyzer Q-CatPartial evidence | 8 | |||
“Quantum Here & Now” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Donoma SoftwareIndirect evidence | 7 | |||
“At Donoma, we believe that an organization's greatest asset is its intellectual property and collective intelligence of its workforce.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Vantage ComputePartial evidence | 6 | |||
“Scale workloads and ensure universal access to compute for AI research, high-performance simulation, and quantum exploration.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | SavantxStrong evidence | 5 | |||
“SavantX is one of the first organizations in the world to leverage the enormous power of quantum computing to solve large-scale data challenges that unlock transformational growth…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | FalcondalePartial evidence | 5 | |||
“Quantum-enhanced machine learning solutions tailored for NISQ but delivering a competitive edge in simulators.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 | ||||
“AQS is building FabriQ, an AI-driven quantum platform for enterprise finance.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Dikan Quantum CorporationStrong evidence | 5 | |||
“Dikan Quantum Corporation (fka Dikan LLC) is a quantum computing software company that has built an industry agnostic Quantum Learning Model.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 74 quantum cloud computing companies based in the United States
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Quantum cloud computing companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 cloud computing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “quantum cloud computing companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among quantum cloud computing 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 an evidence 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, 1,340 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 5, 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
How many quantum cloud computing companies are there based in the United States?
RevenueBase identified 74 quantum cloud computing 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?
Quantinuum, headquartered in Broomfield, tops this list with the largest team on record.
Which city has the most quantum cloud computing companies?
Palo Alto leads with 6 headquartered companies, followed by Boston (4) and College Park (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 1,340 verified decision-maker contacts tracked across these 74 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 5, 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 SmartSearch, 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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