Company lists · Data refreshed October 2026
Top 25 Mainframe computer suppliers worldwide
RevenueBase identified 391 company matches for mainframe computer suppliers worldwide as of October 2026 and tracks 2,033 professional contacts across them, including 328 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers company matches for mainframe computer suppliers worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 27, 2026. Country and city lists for mainframe computer suppliers follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 mainframe computer suppliers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 129 contacts → | ||||
Exact match “North American Systems International, or NASI, has evolved from an IBM midrange shop to a full service IT solution provider.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 2 | 64 contacts → | ||||
Exact match “Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 3 | 44 contacts → | ||||
Exact match “Optica Technologies Incorporated is a leading provider of mainframe connectivity solutions.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 4 | 38 contacts → | ||||
Exact match “1st Technologies is a UK based computer hardware specialist dealing in a wide range of systems but focusing primarily on HP and Dell desktop computers, TFT's, servers…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 5 | 35 contacts → | ||||
Exact match “MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 6 | 33 contacts → | ||||
Exact match “Chayon Technologies (formerly Chayon Computers) is one of the oldest and most dynamic companies in the Israeli computer and IT industry.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 7 | 29 contacts → | ||||
Exact match “The portfolio of services offered my Neocom is composed of sales of computer hardware and software all the way to complex IT systems and turnkey solutions for general use or for a…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 8 | 28 contacts → | ||||
Exact match “Midland Information Systems helps businesses of all sizes cut big costs.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 9 | 26 contacts → | ||||
Exact match “our success is the result of people with more than 15 years experience in the computer industry.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 10 | 22 contacts → | ||||
Exact match “IBC Dialog offre ses services, depuis sa création en 1992, de vente de matériels aux professionnels Normands : PC, Serveurs, Imprimantes, Photocopieurs, Multi-fonctions…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 11 | 20 contacts → | ||||
Exact match “Company DataNova Sweden AB, which was founded in 1992, focused on the area of PCs, servers, networking and accessories.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 12 | 17 contacts → | ||||
Exact match “Tvrtka VENTEX d.o.o.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 13 | 17 contacts → | ||||
Exact match “Empresa de Serviços de Tecnologia como venda de equipamentos, configuração e instalação, suporte e sustentação de serviços de missão crítica.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 14 | 16 contacts → | ||||
Exact match “Fundada desde 1991, Treviño Computación participa en el mercado de las tecnologías de información y comunicaciones, ofertando equipo de cómputo, consumibles, impresoras…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 15 | 14 contacts → | ||||
Exact match “Nordecon Oy is a Finland-based, multinational OEM company and solution provider specializing in complex end-to-end mobile, server, and custom-built desktop solutions.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 16 | 14 contacts → | ||||
Exact match “Présente sur le marché depuis 1986, TECSOFT propose la vente de matériels et de consommables informatiques, ainsi que divers services : assemblage et intégration de portables, PC…” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 17 | 13 contacts → | ||||
Exact match “אספירקום מערכות מספקת שירותי חומרה תוכנה ו-it לחלק נכבד משוק ההייטק בפרט והשוק העסקי והמוסדי בכלל.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 18 | 12 contacts → | ||||
Exact match “Bulgarian hardware and software trading company with extensive experience in SERVICE private, business and government customers.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 19 | 11 contacts → | ||||
Exact match “STATION DE TRAVAIL est une société spécialisée dans la vente de matériel informatique haut de gamme, notamment des serveurs et des workstations.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 20 | 11 contacts → | ||||
Exact match “We are your Canadian source for used & refurbished IBM AS/400 (iSeries), (pSeries), (zSeries) and ALL Lenovo products.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 21 | 10 contacts → | ||||
Exact match “SFI offers one of the most comprehensive portfolios of IBM Mainframe software expertise in North America.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 22 | 10 contacts → | ||||
Exact match “CLC is an expert who proposes stable operation and optimization of computer systems.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 23 | 10 contacts → | ||||
Exact match “Founded In 1997, Alternative Maintenance Solutions, Inc.(AMS) is a privately held company headquartered in Fayetteville,Georgia.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 24 | 9 contacts → | ||||
Exact match “PC Peripherals was founded in May 1992 and is a wholly Irish owned and managed company.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
| 25 | 9 contacts → | ||||
Exact match “Elarasys Worldwide is a leading provider of a broad range of IT solutions for national mid-market businesses for over 20 years.” Recorded in the RevenueBase company graph · Oct 27, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “mainframe computer suppliers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 391 mainframe computer suppliers worldwide
See the full list, filter by size, metro and specialty, and access 328 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Mainframe computer suppliers worldwide at a glance
As of Oct 27, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for mainframe computer suppliers are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “mainframe computer suppliers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- 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 displayed company carries at least one verified work email. RevenueBase tracks 328 professional contacts with verified work emails across the full matched dataset. 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 October 27, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Mainframe computer suppliers by location
2 lists · largest firstEvery Mainframe computer suppliers 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 SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “mainframe computer suppliers”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many mainframe computer suppliers are there worldwide?
RevenueBase identified 391 company matches for mainframe computer suppliers worldwide as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
NASI tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most mainframe computer suppliers?
The United States leads with 44 companies, followed by France (28). Every mainframe computer suppliers list by country and city is linked on this page.
Which city has the most mainframe computer suppliers?
Sao Paulo leads with 6 company records, followed by Belo Horizonte (5) and Moscow (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 328 professional contacts with verified work emails tracked across these 391 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 27, 2026.
Ready to reach these companies? Verified emails and direct dials for all 391 mainframe computer suppliers worldwide. Start with a free account, no credit card.
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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 SmartSearch, 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.
More company lists
Company intelligence · public preview
Top 25 mainframe computer suppliers worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 391 matching company records for mainframe computer suppliers worldwide, with 2,033 tracked contacts and 328 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: October 27, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 mainframe computer suppliers worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  NASInasi.comHQ: Eagan, MN, United StatesReported employees: 51-200 | Eagan, MN, United States | 51-200 | Exact match | 129 contacts → |
“North American Systems International, or NASI, has evolved from an IBM midrange shop to a full service IT solution provider.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Vertalivertali.comHQ: Bromsgrove B60 3dj, United KingdomReported employees: 11-50 | Bromsgrove B60 3dj, United Kingdom | 11-50 | Exact match | 64 contacts → |
“Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Optica Technologies Incorporatedopticatech.com HQ: Louisville, CO, United StatesReported employees: 11-50 | Louisville, CO, United States | 11-50 | Exact match | 44 contacts → |
“Optica Technologies Incorporated is a leading provider of mainframe connectivity solutions.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  1st Technologies LTD1st-tech.co.ukHQ: Preston, United KingdomReported employees: 11-50 | Preston, United Kingdom | 11-50 | Exact match | 38 contacts → |
“1st Technologies is a UK based computer hardware specialist dealing in a wide range of systems but focusing primarily on HP and Dell desktop computers, TFT's, servers…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | ISI PTY LTDisi.com.au HQ: AustraliaReported employees: 51-200 | Australia | 51-200 | Exact match | 35 contacts → |
“MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Chayon Technologieschayon.co.ilHQ: Tel Aviv, IsraelReported employees: 51-200 | Tel Aviv, Israel | 51-200 | Exact match | 33 contacts → |
“Chayon Technologies (formerly Chayon Computers) is one of the oldest and most dynamic companies in the Israeli computer and IT industry.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Neocom AD Skopjeneocom.mk HQ: Skopje, North MacedoniaReported employees: 11-50 | Skopje, North Macedonia | 11-50 | Exact match | 29 contacts → |
“The portfolio of services offered my Neocom is composed of sales of computer hardware and software all the way to complex IT systems and turnkey solutions for general use or for a…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Midland Information Systems, INCmidlandinfosys.com HQ: Apopka, FL, United StatesReported employees: 11-50 | Apopka, FL, United States | 11-50 | Exact match | 28 contacts → |
“Midland Information Systems helps businesses of all sizes cut big costs.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Neptune Advanced Solutionsnas-eg.netHQ: Dokki, EgyptReported employees: 51-200 | Dokki, Egypt | 51-200 | Exact match | 26 contacts → |
“our success is the result of people with more than 15 years experience in the computer industry.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  IBC Dialogibc-dialog.frHQ: Mondeville, FranceReported employees: 11-50 | Mondeville, France | 11-50 | Exact match | 22 contacts → |
“IBC Dialog offre ses services, depuis sa création en 1992, de vente de matériels aux professionnels Normands : PC, Serveurs, Imprimantes, Photocopieurs, Multi-fonctions…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Datanova Sweden ABdatanova.se HQ: Angered, SwedenReported employees: 11-50 | Angered, Sweden | 11-50 | Exact match | 20 contacts → |
“Company DataNova Sweden AB, which was founded in 1992, focused on the area of PCs, servers, networking and accessories.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Ventex D.O.Oventex.hr HQ: Rijeka, CroatiaReported employees: 11-50 | Rijeka, Croatia | 11-50 | Exact match | 17 contacts → |
“Tvrtka VENTEX d.o.o.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Network Expressnetworkexpress.com.br HQ: 04794-000, BrazilReported employees: 11-50 | 04794-000, Brazil | 11-50 | Exact match | 17 contacts → |
“Empresa de Serviços de Tecnologia como venda de equipamentos, configuração e instalação, suporte e sustentação de serviços de missão crítica.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Treviño Computacióntrevicom.com.mx HQ: Xalapa, MexicoReported employees: 11-50 | Xalapa, Mexico | 11-50 | Exact match | 16 contacts → |
“Fundada desde 1991, Treviño Computación participa en el mercado de las tecnologías de información y comunicaciones, ofertando equipo de cómputo, consumibles, impresoras…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Nordecon OYnordecon.fiHQ: Espoo, FinlandReported employees: 11-50 | Espoo, Finland | 11-50 | Exact match | 14 contacts → |
“Nordecon Oy is a Finland-based, multinational OEM company and solution provider specializing in complex end-to-end mobile, server, and custom-built desktop solutions.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Tecsoft Informatiquetecsoft.frHQ: Metz, FranceReported employees: 11-50 | Metz, France | 11-50 | Exact match | 14 contacts → |
“Présente sur le marché depuis 1986, TECSOFT propose la vente de matériels et de consommables informatiques, ainsi que divers services : assemblage et intégration de portables, PC…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Espircom Systems אספירקום מערכותespir.co.ilHQ: אבן יהודה, IsraelReported employees: 11-50 | אבן יהודה, Israel | 11-50 | Exact match | 13 contacts → |
“אספירקום מערכות מספקת שירותי חומרה תוכנה ו-it לחלק נכבד משוק ההייטק בפרט והשוק העסקי והמוסדי בכלל.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Stantek LTDstantek.comHQ: Sofia, BulgariaReported employees: 11-50 | Sofia, Bulgaria | 11-50 | Exact match | 12 contacts → |
“Bulgarian hardware and software trading company with extensive experience in SERVICE private, business and government customers.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Station DE Travailstationdetravail.ma HQ: Casablanca, MoroccoReported employees: 11-50 | Casablanca, Morocco | 11-50 | Exact match | 11 contacts → |
“STATION DE TRAVAIL est une société spécialisée dans la vente de matériel informatique haut de gamme, notamment des serveurs et des workstations.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Bauer Systems Groupbauersystems.com HQ: CanadaReported employees: 11-50 | Canada | 11-50 | Exact match | 11 contacts → |
“We are your Canadian source for used & refurbished IBM AS/400 (iSeries), (pSeries), (zSeries) and ALL Lenovo products.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Streamfoundrystreamfoundry.com HQ: Newton, MA, United StatesReported employees: 11-50 | Newton, MA, United States | 11-50 | Exact match | 10 contacts → |
“SFI offers one of the most comprehensive portfolios of IBM Mainframe software expertise in North America.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | CLC Corporationclc.co.jp HQ: Shinjuku-ku, JapanReported employees: 51-200 | Shinjuku-ku, Japan | 51-200 | Exact match | 10 contacts → |
“CLC is an expert who proposes stable operation and optimization of computer systems.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Alternative Maintenance Solutions, INCamsmaint.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 10 contacts → |
“Founded In 1997, Alternative Maintenance Solutions, Inc.(AMS) is a privately held company headquartered in Fayetteville,Georgia.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | PC Peripheralspcp.ie HQ: Dublin 18, IrelandReported employees: 11-50 | Dublin 18, Ireland | 11-50 | Exact match | 9 contacts → |
“PC Peripherals was founded in May 1992 and is a wholly Irish owned and managed company.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Elarasys Worldwideelarasys.com HQ: Elgin, IL, United StatesReported employees: 11-50 | Elgin, IL, United States | 11-50 | Exact match | 9 contacts → |
“Elarasys Worldwide is a leading provider of a broad range of IT solutions for national mid-market businesses for over 20 years.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 391 company matches
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Mainframe computer suppliers: dataset insights
October 27, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
385 records in the displayed employee bands.
6 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 391 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: October 27, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Mainframe computer suppliers by location
2 lists · largest firstEvery Mainframe computer suppliers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for mainframe computer suppliers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many mainframe computer suppliers did RevenueBase find worldwide?
The saved snapshot records 391 matching company records, 2,033 tracked contacts and 328 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: October 27, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 mainframe computer suppliers worldwide. Snapshot: October 27, 2026. https://revenuebase.ai/companies/browse/mainframe-computer-suppliers.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 mainframe computer suppliers worldwide
RevenueBase records 391 matching company records for mainframe computer suppliers worldwide, with 2,033 tracked contacts and 328 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: October 27, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 mainframe computer suppliers worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | NASInasi.com HQ: Eagan, MN, United StatesReported employees: 51-200 | Eagan, MN, United States | 51-200 | Exact match | 129 contacts → |
“North American Systems International, or NASI, has evolved from an IBM midrange shop to a full service IT solution provider.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Vertalivertali.com HQ: Bromsgrove B60 3dj, United KingdomReported employees: 11-50 | Bromsgrove B60 3dj, United Kingdom | 11-50 | Exact match | 64 contacts → |
“Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Optica Technologies Incorporatedopticatech.com HQ: Louisville, CO, United StatesReported employees: 11-50 | Louisville, CO, United States | 11-50 | Exact match | 44 contacts → |
“Optica Technologies Incorporated is a leading provider of mainframe connectivity solutions.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | 1st Technologies LTD1st-tech.co.uk HQ: Preston, United KingdomReported employees: 11-50 | Preston, United Kingdom | 11-50 | Exact match | 38 contacts → |
“1st Technologies is a UK based computer hardware specialist dealing in a wide range of systems but focusing primarily on HP and Dell desktop computers, TFT's, servers…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | ISI PTY LTDisi.com.au HQ: AustraliaReported employees: 51-200 | Australia | 51-200 | Exact match | 35 contacts → |
“MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Chayon Technologieschayon.co.il HQ: Tel Aviv, IsraelReported employees: 51-200 | Tel Aviv, Israel | 51-200 | Exact match | 33 contacts → |
“Chayon Technologies (formerly Chayon Computers) is one of the oldest and most dynamic companies in the Israeli computer and IT industry.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Neocom AD Skopjeneocom.mk HQ: Skopje, North MacedoniaReported employees: 11-50 | Skopje, North Macedonia | 11-50 | Exact match | 29 contacts → |
“The portfolio of services offered my Neocom is composed of sales of computer hardware and software all the way to complex IT systems and turnkey solutions for general use or for a…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Midland Information Systems, INCmidlandinfosys.com HQ: Apopka, FL, United StatesReported employees: 11-50 | Apopka, FL, United States | 11-50 | Exact match | 28 contacts → |
“Midland Information Systems helps businesses of all sizes cut big costs.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Neptune Advanced Solutionsnas-eg.net HQ: Dokki, EgyptReported employees: 51-200 | Dokki, Egypt | 51-200 | Exact match | 26 contacts → |
“our success is the result of people with more than 15 years experience in the computer industry.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | IBC Dialogibc-dialog.fr HQ: Mondeville, FranceReported employees: 11-50 | Mondeville, France | 11-50 | Exact match | 22 contacts → |
“IBC Dialog offre ses services, depuis sa création en 1992, de vente de matériels aux professionnels Normands : PC, Serveurs, Imprimantes, Photocopieurs, Multi-fonctions…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Datanova Sweden ABdatanova.se HQ: Angered, SwedenReported employees: 11-50 | Angered, Sweden | 11-50 | Exact match | 20 contacts → |
“Company DataNova Sweden AB, which was founded in 1992, focused on the area of PCs, servers, networking and accessories.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Ventex D.O.Oventex.hr HQ: Rijeka, CroatiaReported employees: 11-50 | Rijeka, Croatia | 11-50 | Exact match | 17 contacts → |
“Tvrtka VENTEX d.o.o.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Network Expressnetworkexpress.com.br HQ: 04794-000, BrazilReported employees: 11-50 | 04794-000, Brazil | 11-50 | Exact match | 17 contacts → |
“Empresa de Serviços de Tecnologia como venda de equipamentos, configuração e instalação, suporte e sustentação de serviços de missão crítica.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Treviño Computacióntrevicom.com.mx HQ: Xalapa, MexicoReported employees: 11-50 | Xalapa, Mexico | 11-50 | Exact match | 16 contacts → |
“Fundada desde 1991, Treviño Computación participa en el mercado de las tecnologías de información y comunicaciones, ofertando equipo de cómputo, consumibles, impresoras…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Nordecon OYnordecon.fi HQ: Espoo, FinlandReported employees: 11-50 | Espoo, Finland | 11-50 | Exact match | 14 contacts → |
“Nordecon Oy is a Finland-based, multinational OEM company and solution provider specializing in complex end-to-end mobile, server, and custom-built desktop solutions.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Tecsoft Informatiquetecsoft.fr HQ: Metz, FranceReported employees: 11-50 | Metz, France | 11-50 | Exact match | 14 contacts → |
“Présente sur le marché depuis 1986, TECSOFT propose la vente de matériels et de consommables informatiques, ainsi que divers services : assemblage et intégration de portables, PC…” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Espircom Systems אספירקום מערכותespir.co.il HQ: אבן יהודה, IsraelReported employees: 11-50 | אבן יהודה, Israel | 11-50 | Exact match | 13 contacts → |
“אספירקום מערכות מספקת שירותי חומרה תוכנה ו-it לחלק נכבד משוק ההייטק בפרט והשוק העסקי והמוסדי בכלל.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Stantek LTDstantek.com HQ: Sofia, BulgariaReported employees: 11-50 | Sofia, Bulgaria | 11-50 | Exact match | 12 contacts → |
“Bulgarian hardware and software trading company with extensive experience in SERVICE private, business and government customers.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Station DE Travailstationdetravail.ma HQ: Casablanca, MoroccoReported employees: 11-50 | Casablanca, Morocco | 11-50 | Exact match | 11 contacts → |
“STATION DE TRAVAIL est une société spécialisée dans la vente de matériel informatique haut de gamme, notamment des serveurs et des workstations.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Bauer Systems Groupbauersystems.com HQ: CanadaReported employees: 11-50 | Canada | 11-50 | Exact match | 11 contacts → |
“We are your Canadian source for used & refurbished IBM AS/400 (iSeries), (pSeries), (zSeries) and ALL Lenovo products.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Streamfoundrystreamfoundry.com HQ: Newton, MA, United StatesReported employees: 11-50 | Newton, MA, United States | 11-50 | Exact match | 10 contacts → |
“SFI offers one of the most comprehensive portfolios of IBM Mainframe software expertise in North America.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | CLC Corporationclc.co.jp HQ: Shinjuku-ku, JapanReported employees: 51-200 | Shinjuku-ku, Japan | 51-200 | Exact match | 10 contacts → |
“CLC is an expert who proposes stable operation and optimization of computer systems.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Alternative Maintenance Solutions, INCamsmaint.com HQ: United StatesReported employees: 51-200 | United States | 51-200 | Exact match | 10 contacts → |
“Founded In 1997, Alternative Maintenance Solutions, Inc.(AMS) is a privately held company headquartered in Fayetteville,Georgia.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | PC Peripheralspcp.ie HQ: Dublin 18, IrelandReported employees: 11-50 | Dublin 18, Ireland | 11-50 | Exact match | 9 contacts → |
“PC Peripherals was founded in May 1992 and is a wholly Irish owned and managed company.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Elarasys Worldwideelarasys.com HQ: Elgin, IL, United StatesReported employees: 11-50 | Elgin, IL, United States | 11-50 | Exact match | 9 contacts → |
“Elarasys Worldwide is a leading provider of a broad range of IT solutions for national mid-market businesses for over 20 years.” Recorded description excerpt · October 27, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 391 company matches
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Mainframe computer suppliers: dataset insights
October 27, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
385 records in the displayed employee bands.
6 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 391 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: October 27, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Mainframe computer suppliers by location
2 lists · largest firstEvery Mainframe computer suppliers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for mainframe computer suppliers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many mainframe computer suppliers did RevenueBase find worldwide?
The saved snapshot records 391 matching company records, 2,033 tracked contacts and 328 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: October 27, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 mainframe computer suppliers worldwide. Snapshot: October 27, 2026. https://revenuebase.ai/companies/browse/mainframe-computer-suppliers.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗