Company lists · Data refreshed September 2026
Top 25 Post quantum cryptography companies worldwide
RevenueBase identified 167 post quantum cryptography companies worldwide as of September 2026 and tracks 1,812 professional contacts across them, including 616 with verified work emails and 393 with mobile numbers. The United States is the largest market and London the largest hub.
This list covers post quantum cryptography companies 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 7, 2026. Country and city lists for post quantum cryptography companies 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 post quantum cryptography companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 91 contacts → | ||||
Partial evidence “Arqit - Strong, scalable quantum-safe security” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 2 | 85 contacts → | ||||
Indirect evidence “Our team is shaping the way our digital world is protected against the threats of tomorrow.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 3 | 51 contacts → | ||||
Strong evidence “For years, security leaders have been told that preparing for post-quantum cryptography (PQC) would take years, cost millions and require deep in-house expertise.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 4 | 45 contacts → | ||||
Partial evidence “At Crypto4A we develop fifth-generation quantum-safe crypto-agile Hardware Security Modules (HSM).” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 5 | 44 contacts → | ||||
Partial evidence “Phasecraft is the quantum algorithms company.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 6 | 42 contacts → | ||||
Partial evidence “wolfSSL, the best-tested cryptography, provides embedded security solutions emphasizing speed, size, portability, features, and standards compliance.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 7 | 42 contacts → | ||||
Strong evidence “InfoSec Global, a Keyfactor company, is the leader in next-generation, agile data security for today and in a post-quantum world.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 8 | 35 contacts → | ||||
Indirect evidence “Eternal Encryption.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 9 | 34 contacts → | ||||
Partial evidence “Crypto Quantique is building the most secure end-to-end IoT security platform.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 10 | 32 contacts → | ||||
Partial evidence “Lastwall is a leader in identity security and quantum resilience, trusted by the U.S.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 11 | 32 contacts → | ||||
Partial evidence “BTQ is a global quantum technology company focused on securing mission critical networks.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 12 | 31 contacts → | ||||
Partial evidence “Quantum Base is a world leader in the field of Quantum Security.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 13 | 29 contacts → | ||||
Partial evidence “Eclypses is redefining data security for the AI and quantum era.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 7, 2026Thanks. The Data Team will review it. | |||||
| 15 | 24 contacts → | ||||
Partial evidence “Powerful new quantum technologies promise tremendous benefits, but also pose serious threats to cybersecurity.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 16 | 22 contacts → | ||||
Partial evidence “SafeLogic’s proven and validated cryptographic solutions enable enduring privacy and trust in the ever-changing digital world.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 17 | 21 contacts → | ||||
Strong evidence “By delivering novel cryptographic solutions that preserve truth and trust, Quantropi is bound to become an iconic enabler of dual-use quantum-secure communications as we prepare…” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 18 | 17 contacts → | ||||
Partial evidence “We’re a UK based technology company specialising in quantum-safe communications.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 19 | 17 contacts → | ||||
Partial evidence “Security audits, development, and research for ZKP, FHE, PQC, and MPC applications, and more generally advanced cryptography.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 20 | 17 contacts → | ||||
Partial evidence “Entrokey leverages generative AI to produce quantum-resistant random sequences, ensuring enhanced security against future quantum threats.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 21 | 16 contacts → | ||||
Partial evidence “Quantum XChange protects the world’s data in motion from advances in computing and everyday cybersecurity risks.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 22 | 15 contacts → | ||||
Partial evidence “EndoSec LLC specializes in products for hardware intrinsic security and cryptography plus services for security design and AT planning.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 23 | 15 contacts → | ||||
Indirect evidence “Q-Net Security produces hardware that creates an impenetrable barrier between defined endpoints within your existing network.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 24 | 15 contacts → | ||||
Partial evidence “SQE is pioneering the future of digital ecosystems with its patented Simulated Quantum Entanglement (SQE) technology.” Source: RevenueBase Database · checked Sep 7, 2026Thanks. The Data Team will review it. | |||||
| 25 | 14 contacts → | ||||
Strong evidence “ISARA Corporation is a security solutions company specializing in creating class-defining quantum-safe cryptography for today's computing ecosystems.” Source: RevenueBase Database · checked Sep 7, 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: post quantum cryptography 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 post quantum cryptography companies.
- Partial evidence
- Its own public description names part of post quantum cryptography companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name post quantum cryptography 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 167 post quantum cryptography companies worldwide
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Post quantum cryptography companies worldwide at a glance
As of Sep 7, 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 post quantum cryptography 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.
- Coverage
- 3 countries, largest first: the United States, the United Kingdom, Canada. Country and city lists for post quantum cryptography companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “post quantum cryptography 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 post quantum cryptography 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 post quantum cryptography companies, 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, 616 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 7, 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.
Post quantum cryptography companies by location
3 lists · largest firstEvery Post quantum cryptography companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 post quantum cryptography 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 post quantum cryptography companies are there worldwide?
RevenueBase identified 167 post quantum cryptography companies 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?
ARQIT, headquartered in London, tops this list with the largest team on record.
Which country has the most post quantum cryptography companies?
The United States leads with 101 companies, followed by the United Kingdom (36) and Canada (30). Every post quantum cryptography companies list by country and city is linked on this page.
Which city has the most post quantum cryptography companies?
London leads with 20 headquartered companies, followed by Austin (5) and New York (5).
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 616 verified decision-maker contacts tracked across these 167 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 7, 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.