Companies using hackerone in United Kingdom
As of 4 November 2026, 74 British companies show hackerone: 69 on their website or in DNS records and 5 in their own job postings, led by London.
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
- Top city
- London · 21
- In both sources
- 0
- Most common size
- 201-500 employees
- Team that names it most
- Software engineering · 3 postings
- Top industry, posting companies
- Business & finance services
British companies on hackerone
Every company in the country whose own postings name the tool; job boards and portals left out.
Open the sales or marketing leader at each one with a verified e-mail, or get new British hackerone users every Monday.
Start free, no card. The first 20 are above; e-mails are verified at the mail server when you open them.
By city, company size, industry and team
Footprint tables first (website or DNS), then the companies whose postings name hackerone.
| companies | share | |
|---|---|---|
| London | 21 | 30% |
| Newington | 3 | 4% |
| Manchester | 2 | 3% |
| Queensway | 2 | 3% |
| Beverly Hills | 1 | 1% |
| Birmingham | 1 | 1% |
| Blackpool | 1 | 1% |
| Blacksmith's Corner | 1 | 1% |
| Boston | 1 | 1% |
| Buckland | 1 | 1% |
| companies | share | |
|---|---|---|
| Self-employed | 3 | 4% |
| 2-10 employees | 1 | 1% |
| 11-50 employees | 5 | 7% |
| 51-200 employees | 13 | 19% |
| 201-500 employees | 18 | 26% |
| 501-1000 employees | 4 | 6% |
| 1001-5000 employees | 18 | 26% |
| 5001-10000 employees | 3 | 4% |
| 10,001+ employees | 4 | 6% |
| companies | share | |
|---|---|---|
| London | 2 | 40% |
| Newbury | 1 | 20% |
| companies | share | |
|---|---|---|
| 2-10 employees | 1 | 20% |
| 51-200 employees | 1 | 20% |
| 201-500 employees | 2 | 40% |
| 10,001+ employees | 1 | 20% |
| companies | share | |
|---|---|---|
| Business & finance services | 1 | 20% |
| Media & content | 1 | 20% |
| Technology & software | 1 | 20% |
| Transport, logistics & rental | 1 | 20% |
| Utilities & infrastructure | 1 | 20% |
| postings · companies | |
|---|---|
| Software engineering | 3 · 2 |
| Data & AI | 1 · 1 |
| Legal, compliance & risk | 1 · 1 |
| Sales | 1 · 1 |
hackerone everywhere, and other tools here
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Companies hiring sales in United Kingdom →
compared →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
74 British companies show hackerone: 69 carry it on their website or in their DNS records, 5 name it in their own job postings, 0 do both. (Breaknorm, 4 November 2026, https://breaknorm.co/tools/hackerone/united-kingdom)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from the applicant tracking systems behind British career sites. A tool counts when the employer's own text names it as the team's system.
- CountryFrom the company's own website: imprint, address, phone prefix and language, with a confidence score. Not the posting's location.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- ExclusionsJob boards, portals and aggregators are kept out of company lists.
hackerone in United Kingdom: questions
Is this every British company on hackerone?
It is every British company whose website, DNS records or own job postings show it: 74 in total. Companies that use hackerone without any public trace are not counted.
What does "United Kingdom" mean here?
The country of the company, from its own website (imprint, address, phone prefix, language), not where the posting is located. A German company hiring in Paris still counts as German.
How do I get the British list with e-mails?
Sign up, filter companies on hackerone and United Kingdom, and open the people you want. Counting is free; the first 1,000 results are too.
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Every British company on hackerone,
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