POSIX VS Red Hat Enterprise Linux
As of 30 October 2026, Red Hat Enterprise Linux is named by 1,653 companies and POSIX by 103; POSIX skews to companies under 200 people (35% vs 42%), Red Hat Enterprise Linux to companies over 1,000 (35% vs 29%).
As of 30 October 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: POSIX's script and mail records show on hundreds of thousands of small sites, Red Hat Enterprise Linux rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- POSIX: 2–200 employees
- 35%
- Red Hat Enterprise Linux: 2–200 employees
- 42%
- POSIX: 1,000+ employees
- 29%
- Red Hat Enterprise Linux: 1,000+ employees
- 35%
- Postings per company, 90 days
- 2.1 · 4.6
- Website or DNS footprint
- 0 · 0
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | POSIX | share | Red Hat Enterprise Linux | share | Leans |
|---|---|---|---|---|---|
| 2-10 employees | 5 | 5% | 79 | 5% | even |
| 11-50 employees | 16 | 16% | 244 | 15% | even |
| 51-200 employees | 15 | 15% | 369 | 22% | Red Hat Enterprise Linux |
| 201-500 employees | 20 | 19% | 225 | 14% | POSIX |
| 501-1000 employees | 17 | 17% | 154 | 9% | POSIX |
| 1001-5000 employees | 13 | 13% | 254 | 15% | Red Hat Enterprise Linux |
| 5001-10000 employees | 6 | 6% | 77 | 5% | even |
| 10,001+ employees | 11 | 11% | 240 | 15% | Red Hat Enterprise Linux |
| Self-employed | – | – | 11 | 1% | outside top 12 |
| Segment | POSIX | share | Red Hat Enterprise Linux | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 46 | 45% | 827 | 50% | Red Hat Enterprise Linux |
| Manufacturing & industry | 30 | 29% | 211 | 13% | POSIX |
| Business & finance services | 8 | 8% | 315 | 19% | Red Hat Enterprise Linux |
| Media & content | 4 | 4% | 37 | 2% | even |
| Automotive | 3 | 3% | 18 | 1% | even |
| Consumer services & leisure | 3 | 3% | 37 | 2% | even |
| Utilities & infrastructure | 3 | 3% | 52 | 3% | even |
| Commerce & trade | 2 | 2% | 29 | 2% | even |
| Public, community & associations | 2 | 2% | 47 | 3% | even |
| Health care | 1 | 1% | 31 | 2% | even |
| Transport, logistics & rental | 1 | 1% | 22 | 1% | even |
| Property & construction | – | – | 19 | 1% | outside top 12 |
| Segment | POSIX | share | Red Hat Enterprise Linux | share | Leans |
|---|---|---|---|---|---|
| United States | 72 | 70% | 966 | 58% | POSIX |
| United Kingdom | 6 | 6% | 101 | 6% | even |
| Germany | 5 | 5% | 102 | 6% | even |
| India | 4 | 4% | 40 | 2% | even |
| Canada | 3 | 3% | 47 | 3% | even |
| Sweden | 2 | 2% | 19 | 1% | even |
| Austria | 1 | 1% | – | – | outside top 12 |
| Australia | 1 | 1% | 18 | 1% | even |
| Belgium | 1 | 1% | – | – | outside top 12 |
| Bulgaria | 1 | 1% | – | – | outside top 12 |
| Denmark | 1 | 1% | – | – | outside top 12 |
| France | 1 | 1% | 80 | 5% | Red Hat Enterprise Linux |
| Netherlands | – | – | 23 | 1% | outside top 12 |
| Poland | – | – | 22 | 1% | outside top 12 |
| Singapore | – | – | 22 | 1% | outside top 12 |
| Switzerland | – | – | 19 | 1% | outside top 12 |
| Segment | POSIX | share | Red Hat Enterprise Linux | share | Leans |
|---|---|---|---|---|---|
| Software engineering | 198 | 56% | 2,657 | 26% | POSIX |
| IT operations & business systems | 33 | 9% | 4,714 | 46% | Red Hat Enterprise Linux |
| Data & AI | 13 | 4% | 214 | 2% | even |
| Quality, safety & environment | 13 | 4% | – | – | outside top 12 |
| Engineering (non-software) | 8 | 2% | 578 | 6% | Red Hat Enterprise Linux |
| Sales | 7 | 2% | 145 | 1% | even |
| Product, program & project management | 3 | 1% | 146 | 1% | even |
| Logistics warehouse and transport | 2 | 1% | – | – | outside top 12 |
| Skilled trades and field service | 2 | 1% | 20 | 0% | even |
| Business development & strategy | 1 | 0% | 17 | 0% | even |
| Education & training | 1 | 0% | 25 | 0% | even |
| Manufacturing and production | 1 | 0% | – | – | outside top 12 |
| Customer service & success | – | – | 121 | 1% | outside top 12 |
| Administration & office | – | – | 25 | 0% | outside top 12 |
| General management & consulting | – | – | 20 | 0% | outside top 12 |
The companies behind each column
Companies using POSIX →
Companies using Red Hat Enterprise Linux →
linux unix ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Red Hat Enterprise Linux is named by 1,653 companies in job postings and POSIX by 103; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/posix-vs-red-hat-enterprise-linux)
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 career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- 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.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
POSIX vs Red Hat Enterprise Linux: questions
Which is more used, POSIX or Red Hat Enterprise Linux?
By companies naming it in their own job postings, Red Hat Enterprise Linux (1,653) over POSIX (103). By website-and-DNS footprint, Red Hat Enterprise Linux (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses POSIX?
35% of POSIX companies have 2 to 200 employees, against 42% for Red Hat Enterprise Linux. 29% of POSIX companies have over 1,000 employees, against 35% for Red Hat Enterprise Linux.
Do companies run both?
0 companies name both in their postings, usually POSIX in marketing and Red Hat Enterprise Linux in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
Get either list your way
The same data as a search, over MCP and the API, as bulk files, or pushed to you as it changes.
Every company on either tool,
with the person who owns it
Filter on POSIX or Red Hat Enterprise Linux. Start free, no card.