Shipvane · 4 AE roles
Marco E. · joined Cargolio
Fleetora · first roles in DEIBM i VS z/OS_
As of 4 November 2026, z/OS is named by 257 companies and IBM i by 1,000; IBM i skews to companies under 200 people (22% vs 32%), z/OS to companies over 1,000 (48% vs 52%).
As of 4 November 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: IBM i's script and mail records show on hundreds of thousands of small sites, z/OS rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- IBM i: 2–200 employees
- 22%
- z/OS: 2–200 employees
- 32%
- IBM i: 1,000+ employees
- 52%
- z/OS: 1,000+ employees
- 48%
- Postings per company, 90 days
- 3.7 · 4.1
- 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 | IBM i | share | z/OS | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 13 | 1% | 4 | 2% | even |
| 2-10 employees | 39 | 4% | 15 | 6% | even |
| 11-50 employees | 45 | 5% | 32 | 12% | z/OS |
| 51-200 employees | 133 | 13% | 36 | 14% | even |
| 201-500 employees | 140 | 14% | 24 | 9% | IBM i |
| 501-1000 employees | 114 | 11% | 23 | 9% | IBM i |
| 1001-5000 employees | 243 | 24% | 34 | 13% | IBM i |
| 5001-10000 employees | 77 | 8% | 14 | 5% | IBM i |
| 10,001+ employees | 196 | 20% | 75 | 29% | z/OS |
| Segment | IBM i | share | z/OS | share | Leans |
|---|---|---|---|---|---|
| Manufacturing & industry | 247 | 25% | 7 | 3% | IBM i |
| Commerce & trade | 164 | 16% | 6 | 2% | IBM i |
| Business & finance services | 153 | 15% | 98 | 38% | z/OS |
| Technology & software | 129 | 13% | 115 | 45% | z/OS |
| Transport, logistics & rental | 81 | 8% | 3 | 1% | IBM i |
| Automotive | 67 | 7% | 2 | 1% | IBM i |
| Property & construction | 27 | 3% | 3 | 1% | even |
| Health care | 26 | 3% | 1 | 0% | IBM i |
| Public, community & associations | 24 | 2% | 9 | 4% | even |
| Utilities & infrastructure | 19 | 2% | 2 | 1% | even |
| Consumer services & leisure | 18 | 2% | 3 | 1% | even |
| Hospitality & travel | 18 | 2% | – | – | outside top 12 |
| Media & content | – | – | 8 | 3% | outside top 12 |
| Segment | IBM i | share | z/OS | share | Leans |
|---|---|---|---|---|---|
| United States | 614 | 61% | 128 | 50% | IBM i |
| Canada | 57 | 6% | 4 | 2% | IBM i |
| France | 51 | 5% | 24 | 9% | z/OS |
| Germany | 41 | 4% | 14 | 5% | even |
| United Kingdom | 38 | 4% | 8 | 3% | even |
| Italy | 35 | 4% | – | – | outside top 12 |
| Australia | 13 | 1% | 6 | 2% | even |
| Spain | 12 | 1% | 4 | 2% | even |
| India | 10 | 1% | – | – | outside top 12 |
| Netherlands | 10 | 1% | – | – | outside top 12 |
| Belgium | 8 | 1% | 3 | 1% | even |
| Austria | 7 | 1% | – | – | outside top 12 |
| Portugal | – | – | 5 | 2% | outside top 12 |
| Denmark | – | – | 4 | 2% | outside top 12 |
| Poland | – | – | 4 | 2% | outside top 12 |
| Sweden | – | – | 4 | 2% | outside top 12 |
| Segment | IBM i | share | z/OS | share | Leans |
|---|---|---|---|---|---|
| logistics warehouse and transport | 708 | 15% | 1 | 0% | IBM i |
| IT operations & business systems | 484 | 10% | 567 | 35% | z/OS |
| Finance & accounting | 420 | 9% | 13 | 1% | IBM i |
| Software engineering | 412 | 9% | 457 | 28% | z/OS |
| Retail & store operations | 259 | 5% | – | – | outside top 12 |
| Customer service & success | 211 | 4% | 3 | 0% | IBM i |
| Sales | 183 | 4% | 4 | 0% | IBM i |
| manufacturing and production | 172 | 4% | 12 | 1% | IBM i |
| General management & consulting | 161 | 3% | – | – | outside top 12 |
| Quality, safety & environment | 116 | 2% | 1 | 0% | IBM i |
| Administration & office | 97 | 2% | 1 | 0% | even |
| Product, program & project management | 81 | 2% | 47 | 3% | even |
| skilled trades and field service | 75 | 2% | – | – | outside top 12 |
| Engineering (non-software) | 72 | 2% | 41 | 3% | even |
| procurement and purchasing | 71 | 1% | – | – | outside top 12 |
| Data & AI | 61 | 1% | 19 | 1% | even |
| hospitality and food service | 33 | 1% | – | – | outside top 12 |
| healthcare support and caregiving | 23 | 0% | – | – | outside top 12 |
| Legal, compliance & risk | 18 | 0% | – | – | outside top 12 |
| Unclassified | 18 | 0% | 5 | 0% | even |
| research and science | 13 | 0% | – | – | outside top 12 |
| healthcare clinical | 12 | 0% | – | – | outside top 12 |
| Human resources | 11 | 0% | – | – | outside top 12 |
| Travel, leisure & events | 11 | 0% | – | – | outside top 12 |
| construction and civil | 8 | 0% | 2 | 0% | even |
| Marketing & communications | 8 | 0% | – | – | outside top 12 |
| Business development & strategy | 7 | 0% | – | – | outside top 12 |
| Education & training | 6 | 0% | 1 | 0% | even |
| social care and community | 6 | 0% | – | – | outside top 12 |
| arts media and entertainment | 2 | 0% | – | – | outside top 12 |
The companies behind each column
Companies using IBM i →
Companies using z/OS →
mainframe midrange ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
z/OS is named by 257 companies in job postings and IBM i by 1,000; 25 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/ibm-i-vs-z-os)
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.
IBM i vs z/OS: questions
Which is more used, IBM i or z/OS?
By companies naming it in their own job postings, IBM i (1,000) over z/OS (257). By website-and-DNS footprint, z/OS (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses IBM i?
22% of IBM i companies have 2 to 200 employees, against 32% for z/OS. 52% of IBM i companies have over 1,000 employees, against 48% for z/OS.
Do companies run both?
25 companies name both in their postings, usually IBM i in marketing and z/OS 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.
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