--- title: "Which companies in United States use IBM Mainframe (z/OS)?" description: "Ensono, Broadcom, The Depository Trust & Clearing Corporation (DTCC), Rocket Software and more." canonical: https://jobspipe.dev/technologies/ibm-mainframe/us --- # Which companies in United States use IBM Mainframe (z/OS)? > Ensono, Broadcom, The Depository Trust & Clearing Corporation (DTCC), Rocket Software and more. 1,422 companies hiring in United States whose own job postings show they use IBM Mainframe (z/OS): 56 confirmed, 1,366 likely. Updated daily from live postings. **Canonical URL:** https://jobspipe.dev/technologies/ibm-mainframe/us 1,422 companies with postings in United States use IBM Mainframe (z/OS) according to their own job postings: 56 confirmed and 1,366 likely. The 36 listed below are confirmed users with at least 2 postings and a verified website; the rest are counted here but not named. - **Confirmed companies:** 56 - **Likely companies:** 1,366 - **Category:** Developer tools - **As of:** 25 Sep 2026 ## Companies using IBM Mainframe (z/OS) | # | Company | Postings naming it | Last seen | |---|---|---|---| | 1 | [Ensono](https://jobspipe.dev/hiring/ensono.com) | 70 | 8 Oct 2026 | | 2 | [Broadcom](https://jobspipe.dev/hiring/broadcom.com) | 62 | 7 Oct 2026 | | 3 | [The Depository Trust & Clearing Corporation (DTCC)](https://jobspipe.dev/hiring/dtcc.com) | 56 | 8 Oct 2026 | | 4 | [Rocket Software](https://jobspipe.dev/hiring/rocketsoftware.com) | 41 | 7 Oct 2026 | | 5 | [Wells Fargo](https://jobspipe.dev/hiring/wellsfargo.com) | 32 | 6 Oct 2026 | | 6 | [PNC](https://jobspipe.dev/hiring/pnc.com) | 20 | 6 Oct 2026 | | 7 | [Travel + Leisure Co.](https://jobspipe.dev/hiring/travelandleisureco.com) | 19 | 1 Oct 2026 | | 8 | [First Citizens Bank](https://jobspipe.dev/hiring/firstcitizens.com) | 18 | 6 Oct 2026 | | 9 | [Morgan Stanley](https://jobspipe.dev/hiring/morganstanley.com) | 13 | 7 Oct 2026 | | 10 | [Brown Brothers Harriman](https://jobspipe.dev/hiring/bbh.com) | 12 | 2 Oct 2026 | | 11 | [Cloud and Things](https://jobspipe.dev/hiring/cloudandthings.com) | 10 | 6 Oct 2026 | | 12 | [Boston Consulting Group (BCG)](https://jobspipe.dev/hiring/bcg.com) | 7 | 29 Sep 2026 | | 13 | [Infinite Computer Solutions](https://jobspipe.dev/hiring/infinite.com) | 7 | 7 Oct 2026 | | 14 | [Advanced Systems Design](https://jobspipe.dev/hiring/asd-web.com) | 6 | 29 Sep 2026 | | 15 | [Northwestern Mutual](https://jobspipe.dev/hiring/northwesternmutual.com) | 5 | 29 Sep 2026 | | 16 | [Seneca Resources](https://jobspipe.dev/hiring/senecahq.com) | 5 | 30 Sep 2026 | | 17 | [Sports Illustrated](https://jobspipe.dev/hiring/si.com) | 5 | 29 Sep 2026 | | 18 | [Thrivent](https://jobspipe.dev/hiring/thrivent.com) | 5 | 4 Sep 2026 | | 19 | [TM Floyd & Company (TMF)](https://jobspipe.dev/hiring/tmfloyd.com) | 4 | 7 Oct 2026 | | 20 | [Arkhya Tech. Inc.](https://jobspipe.dev/hiring/arkhyatech.com) | 3 | 28 Sep 2026 | | 21 | [ASSYST, Inc.](https://jobspipe.dev/hiring/assyst.net) | 3 | 7 Oct 2026 | | 22 | [Oliver James](https://jobspipe.dev/hiring/oliverjames.com) | 3 | 5 Oct 2026 | | 23 | [TECKpert](https://jobspipe.dev/hiring/teckpert.com) | 3 | 29 Sep 2026 | | 24 | [Toyota North America](https://jobspipe.dev/hiring/careers.toyota.com) | 3 | 5 Oct 2026 | | 25 | [UMB Bank](https://jobspipe.dev/hiring/umb.com) | 3 | 25 Sep 2026 | | 26 | [Agility Partners](https://jobspipe.dev/hiring/agilitypartners.io) | 2 | 28 Sep 2026 | | 27 | [Cyber Space Technologies LLC](https://jobspipe.dev/hiring/cyberspaceinc.com) | 2 | 25 Sep 2026 | | 28 | [First Horizon Bank](https://jobspipe.dev/hiring/firsthorizon.com) | 2 | 4 Oct 2026 | | 29 | [GTECH LLC](https://jobspipe.dev/hiring/greattechglobal.com) | 2 | 25 Sep 2026 | | 30 | [GuidePoint Security](https://jobspipe.dev/hiring/guidepointsecurity.com) | 2 | 2 Oct 2026 | | 31 | [HealthFitness](https://jobspipe.dev/hiring/healthfitness.com) | 2 | 30 Sep 2026 | | 32 | [Hexaware Technologies](https://jobspipe.dev/hiring/hexaware.com) | 2 | 27 Sep 2026 | | 33 | [Impellam Group](https://jobspipe.dev/hiring/impellam.com) | 2 | 28 Sep 2026 | | 34 | [Technologix IT Inc](https://jobspipe.dev/hiring/technologixit.com) | 2 | 25 Sep 2026 | | 35 | [UAB Medicine](https://jobspipe.dev/hiring/uabmedicine.org) | 2 | 30 Sep 2026 | | 36 | [Yorkshire Global Solutions Inc.](https://jobspipe.dev/hiring/ygs-us.com) | 2 | 25 Sep 2026 | ## By country - [India](https://jobspipe.dev/technologies/ibm-mainframe/in) - [Canada](https://jobspipe.dev/technologies/ibm-mainframe/ca) - [France](https://jobspipe.dev/technologies/ibm-mainframe/fr) - [Brazil](https://jobspipe.dev/technologies/ibm-mainframe/br) - [Mexico](https://jobspipe.dev/technologies/ibm-mainframe/mx) - [Spain](https://jobspipe.dev/technologies/ibm-mainframe/es) - [United Kingdom](https://jobspipe.dev/technologies/ibm-mainframe/gb) - [Germany](https://jobspipe.dev/technologies/ibm-mainframe/de) - [Singapore](https://jobspipe.dev/technologies/ibm-mainframe/sg) Worldwide: [Which companies use IBM Mainframe (z/OS)?](https://jobspipe.dev/technologies/ibm-mainframe) ## FAQ ### How many companies use IBM Mainframe (z/OS) in United States? 1,422 companies in United States have job postings that show they use IBM Mainframe (z/OS), as of 25 Sep 2026. 56 are confirmed and 1,366 are likely. ### Which companies use IBM Mainframe (z/OS) in United States? Ensono, Broadcom, The Depository Trust & Clearing Corporation (DTCC), Rocket Software, Wells Fargo are among the confirmed IBM Mainframe (z/OS) users with the most postings naming it in United States. The full list on this page names 36 companies. ### How does JobsPipe know a company uses IBM Mainframe (z/OS)? From the company's own job postings. Each posting is read for the technologies it names, and every company and technology pair is graded: confirmed when two independent checks agree on IBM Mainframe (z/OS) in at least one posting, likely when it is a stated requirement or appears in two separate postings. A single passing mention is not counted here. It is evidence of a team working with IBM Mainframe (z/OS), not a purchase record. ## Reproduce ```bash curl -X POST https://api.jobspipe.dev/v1/companies/search -H "Authorization: Bearer $JOBSPIPE_API_KEY" -H "Content-Type: application/json" -d '{"company_technology_slug_or":["ibm-mainframe"],"tier_min":"confirmed","company_country_code_or":["US"],"limit":25}' ``` --- Try it with no key: `curl -d '{"limit":3}' https://api.jobspipe.dev/v1/sandbox/jobs/search`. AI agents: the full machine-readable index of this site is https://jobspipe.dev/llms.txt?src=md-twin - API quickstart, MCP server, pricing. Free key (1,000 jobs to start): https://jobspipe.dev/signup