Company lists · Data refreshed November 2026
Top 24 Mainframe migration services based in the United States
RevenueBase identified 83 company matches for mainframe migration services associated with the United States as of November 2026 and tracks 5,008 professional contacts across them, including 2,584 with verified work emails. New York is the largest hub.
This list covers company matches for mainframe migration services associated with the United States, 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 November 6, 2026.
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 24 largest mainframe migration services based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,542 contacts → | ||||
Exact match “Ensono is an expert technology adviser and managed service provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 2 | 208 contacts → | ||||
Exact match “Astadia is the industry leader for mainframe migrations and modernizations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 3 | 108 contacts → | ||||
Exact match “Founded in 2001, EvolveWare provides seamless application modernization journeys for enterprises, government organizations and global partners.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 4 | 104 contacts → | ||||
Exact match “Data Driven and Data First!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 5 | 90 contacts → | ||||
Exact match “Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 6 | 82 contacts → | ||||
Exact match “Softacom is a full-cycle business app migration and modernization provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 7 | 59 contacts → | ||||
Exact match “Legacy to Cloud-At Your Pace, Without the Risk.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 8 | 56 contacts → | ||||
Exact match “Modern Systems empowers efficiency, agility, and competitive advantage through core application modernization.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 9 | 55 contacts → | ||||
Exact match “As a leading provider of software modernization services, TSRI enables technology readiness for the Cloud and other modern architecture environments.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 10 | 31 contacts → | ||||
Exact match “Data Strategies Interchange is a leading provider of large-scale data migration and conversion services to Fortune 500 and Global companies that need to upgrade from older…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 11 | 29 contacts → | ||||
Exact match “Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 12 | 23 contacts → | ||||
Exact match “iAppSys: Experts in Enterprise Software, Cloud, and AI Innovation iAppSys is a trusted enterprise solutions provider with over 20 years of experience helping organizations…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 13 | 19 contacts → | ||||
Exact match “Zengines helps financial services enterprises position their data for AI, usable across every system change, and explainable across decades of legacy code.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 14 | 17 contacts → | ||||
Exact match “Mertech is a leading provider of application development solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 15 | 15 contacts → | ||||
Exact match “To say we're a data migration company would be an understatement.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 16 | 13 contacts → | ||||
Exact match “ITR Consulting is a leading IT Services and Consulting firm helping organizations modernize, transform, and scale through secure, innovative technology solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 17 | 12 contacts → | ||||
Exact match “At AveriSource, our mission is to help you achieve your legacy modernization objectives.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 18 | 11 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 · Nov 6, 2026 · View company records in RevenueBase | |||||
| 19 | 10 contacts → | ||||
Exact match “Infinite Corporation is the global leader in IBM i (AS/400) migration and modernization toolsets.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 20 | 9 contacts → | ||||
Exact match “Unlocking Legacy Code with AI, Automated, Accurate, Future-Ready Updraft, powered by Natsoft, is an AI-driven legacy modernization platform that transforms complex, undocumented…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 21 | 8 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 22 | 8 contacts → | ||||
Exact match “Leaders in Systems Modernizations, our three decades of experience include winning several technology awards, a story on CBS's 60 Minutes, and many successful modernization…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 23 | 7 contacts → | ||||
Exact match “Software Development, Application Development, App Development, Application Migration, Cloud Migration, App Modernization, Database Migration Solutions Architecting, Project…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 24 | 4 contacts → | ||||
Exact match “Behind many successful organizations there are mature legacy applications at the core of vital business processes, and they are too valuable to be left behind.” Recorded in the RevenueBase company graph · Nov 6, 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 migration services”. 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 24 of 83 mainframe migration services based in the United States
See the full list, filter by size, metro and specialty, and access 2,584 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Mainframe migration services based in the United States at a glance
As of Nov 6, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 83 companies.
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.
- What qualifies
- Company records associated with the United States whose business descriptions match “mainframe migration services” 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 2,584 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 November 6, 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.
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 migration services”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many mainframe migration services are there based in the United States?
RevenueBase identified 83 company matches for mainframe migration services associated with the United States as of November 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?
Ensono tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most mainframe migration services?
New York leads with 3 company records, followed by Tampa (3) and Dallas (2).
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 2,584 professional contacts with verified work emails tracked across these 83 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 November 6, 2026.
Ready to reach these companies? Verified emails and direct dials for all 83 mainframe migration services based in the United States. 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
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- AI companies based in the United States
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Company intelligence · public preview
Top 24 mainframe migration services based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 83 matching company records for mainframe migration services based in the United States, with 5,008 tracked contacts and 2,584 verified work emails.
This public preview shows 24 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 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 24 mainframe migration services based in the United States
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 |  Ensonoensono.comHQ: Downers Grove, IL, United StatesReported employees: 1,001-5,000 | Downers Grove, IL, United States | 1,001-5,000 | Exact match | 3,542 contacts → |
“Ensono is an expert technology adviser and managed service provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Astadiaastadia.comHQ: St. Louis, MO, United StatesReported employees: 201-500 | St. Louis, MO, United States | 201-500 | Exact match | 208 contacts → |
“Astadia is the industry leader for mainframe migrations and modernizations.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Evolveware, INCevolveware.comHQ: Santa Clara, CA, United StatesReported employees: 51-200 | Santa Clara, CA, United States | 51-200 | Exact match | 108 contacts → |
“Founded in 2001, EvolveWare provides seamless application modernization journeys for enterprises, government organizations and global partners.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Proliant Dataproliantdatallc.comHQ: Burlington, MA, United StatesReported employees: 51-200 | Burlington, MA, United States | 51-200 | Exact match | 104 contacts → |
“Data Driven and Data First!” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Treehouse Softwaretreehouse.comHQ: Sewickley, PA, United StatesReported employees: 11-50 | Sewickley, PA, United States | 11-50 | Exact match | 90 contacts → |
“Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Softacomsoftacom.comHQ: Bellevue, WA, United StatesReported employees: 51-200 | Bellevue, WA, United States | 51-200 | Exact match | 82 contacts → |
“Softacom is a full-cycle business app migration and modernization provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Openlegacyopenlegacy.comHQ: Princeton, NJ, United StatesReported employees: 51-200 | Princeton, NJ, United States | 51-200 | Exact match | 59 contacts → |
“Legacy to Cloud-At Your Pace, Without the Risk.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Modern Systems An Advanced Companymodernsystems.oneadvanced.comHQ: Dallas, TX, United StatesReported employees: 51-200 | Dallas, TX, United States | 51-200 | Exact match | 56 contacts → |
“Modern Systems empowers efficiency, agility, and competitive advantage through core application modernization.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | HQ: Kirkland, WA, United StatesReported employees: 11-50 | Kirkland, WA, United States | 11-50 | Exact match | 55 contacts → |
“As a leading provider of software modernization services, TSRI enables technology readiness for the Cloud and other modern architecture environments.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Data Strategies Interchange, LLCgo-dsi.comHQ: Houston, TX, United StatesReported employees: 11-50 | Houston, TX, United States | 11-50 | Exact match | 31 contacts → |
“Data Strategies Interchange is a leading provider of large-scale data migration and conversion services to Fortune 500 and Global companies that need to upgrade from older…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Heirloom Computingheirloomcomputing.comHQ: Alamo, CA, United StatesReported employees: 51-200 | Alamo, CA, United States | 51-200 | Exact match | 29 contacts → |
“Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Iappsys INCiappsys.comHQ: San Diego, CA, United StatesReported employees: 11-50 | San Diego, CA, United States | 11-50 | Exact match | 23 contacts → |
“iAppSys: Experts in Enterprise Software, Cloud, and AI Innovation iAppSys is a trusted enterprise solutions provider with over 20 years of experience helping organizations…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Zengineszengines.aiHQ: Bedford, MA, United StatesReported employees: 11-50 | Bedford, MA, United States | 11-50 | Exact match | 19 contacts → |
“Zengines helps financial services enterprises position their data for AI, usable across every system change, and explainable across decades of legacy code.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Mertech Data Systems, INCmertechdata.comHQ: Pembroke Pines, FL, United StatesReported employees: 11-50 | Pembroke Pines, FL, United States | 11-50 | Exact match | 17 contacts → |
“Mertech is a leading provider of application development solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Platform Transitionplatformtransition.comHQ: Plantation, FL, United StatesReported employees: 11-50 | Plantation, FL, United States | 11-50 | Exact match | 15 contacts → |
“To say we're a data migration company would be an understatement.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  ITR Consultingitrtechsystems.comHQ: Arlington Heights, IL, United StatesReported employees: 201-500 | Arlington Heights, IL, United States | 201-500 | Exact match | 13 contacts → |
“ITR Consulting is a leading IT Services and Consulting firm helping organizations modernize, transform, and scale through secure, innovative technology solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Averisourceaverisource.comHQ: San Antonio, TX, United StatesReported employees: 51-200 | San Antonio, TX, United States | 51-200 | Exact match | 12 contacts → |
“At AveriSource, our mission is to help you achieve your legacy modernization objectives.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Streamfoundrystreamfoundry.comHQ: Newton, MA, United StatesReported employees: 11-50 | Newton, MA, United States | 11-50 | Exact match | 11 contacts → |
“SFI offers one of the most comprehensive portfolios of IBM Mainframe software expertise in North America.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Infinite Corporationinfinitecorporation.comHQ: Laguna Niguel, CA, United StatesReported employees: 51-200 | Laguna Niguel, CA, United States | 51-200 | Exact match | 10 contacts → |
“Infinite Corporation is the global leader in IBM i (AS/400) migration and modernization toolsets.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Updraft Worksupdraftworks.comHQ: Somerset, NJ, United StatesReported employees: 51-200 | Somerset, NJ, United States | 51-200 | Exact match | 9 contacts → |
“Unlocking Legacy Code with AI, Automated, Accurate, Future-Ready Updraft, powered by Natsoft, is an AI-driven legacy modernization platform that transforms complex, undocumented…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Datatek, INCdatatek-net.comHQ: Durham, NC, United StatesReported employees: 11-50 | Durham, NC, United States | 11-50 | Exact match | 8 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 22 |  Expersolveexpersolve.comHQ: Tarrytown, NY, United StatesReported employees: 11-50 | Tarrytown, NY, United States | 11-50 | Exact match | 8 contacts → |
“Leaders in Systems Modernizations, our three decades of experience include winning several technology awards, a story on CBS's 60 Minutes, and many successful modernization…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Mimasoftmimasoft.orgHQ: Alpharetta, GA, United StatesReported employees: 1-10 | Alpharetta, GA, United States | 1-10 | Exact match | 7 contacts → |
“Software Development, Application Development, App Development, Application Migration, Cloud Migration, App Modernization, Database Migration Solutions Architecting, Project…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Cleveris Technologiescleveris.comHQ: Houston, United StatesReported employees: 11-50 | Houston, United States | 11-50 | Exact match | 4 contacts → |
“Behind many successful organizations there are mature legacy applications at the core of vital business processes, and they are too valuable to be left behind.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 24 of 83 company matches
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Mainframe migration services: dataset insights
November 6, 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
83 records in the displayed employee bands.
0 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 worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 83 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: November 6, 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 ↗
Questions about this company list
What does Exact match mean for mainframe migration services?
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 migration services did RevenueBase find based in the United States?
The saved snapshot records 83 matching company records, 5,008 tracked contacts and 2,584 verified emails. The public preview displays 24 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: November 6, 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.
Related lists
Cite this list
RevenueBase Data Team. Top 24 mainframe migration services based in the United States. Snapshot: November 6, 2026. https://revenuebase.ai/companies/mainframe-migration-services/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
- Media companies based in the United States
- Oil and gas companies based in the United States
- Real estate companies based in the United States
Company intelligence · public preview
Top 24 mainframe migration services based in the United States
RevenueBase records 83 matching company records for mainframe migration services based in the United States, with 5,008 tracked contacts and 2,584 verified work emails.
This public preview shows 24 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 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 24 mainframe migration services based in the United States
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 | Ensonoensono.com HQ: Downers Grove, IL, United StatesReported employees: 1,001-5,000 | Downers Grove, IL, United States | 1,001-5,000 | Exact match | 3,542 contacts → |
“Ensono is an expert technology adviser and managed service provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Astadiaastadia.com HQ: St. Louis, MO, United StatesReported employees: 201-500 | St. Louis, MO, United States | 201-500 | Exact match | 208 contacts → |
“Astadia is the industry leader for mainframe migrations and modernizations.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Evolveware, INCevolveware.com HQ: Santa Clara, CA, United StatesReported employees: 51-200 | Santa Clara, CA, United States | 51-200 | Exact match | 108 contacts → |
“Founded in 2001, EvolveWare provides seamless application modernization journeys for enterprises, government organizations and global partners.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Proliant Dataproliantdatallc.com HQ: Burlington, MA, United StatesReported employees: 51-200 | Burlington, MA, United States | 51-200 | Exact match | 104 contacts → |
“Data Driven and Data First!” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Treehouse Softwaretreehouse.com HQ: Sewickley, PA, United StatesReported employees: 11-50 | Sewickley, PA, United States | 11-50 | Exact match | 90 contacts → |
“Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Softacomsoftacom.com HQ: Bellevue, WA, United StatesReported employees: 51-200 | Bellevue, WA, United States | 51-200 | Exact match | 82 contacts → |
“Softacom is a full-cycle business app migration and modernization provider.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Openlegacyopenlegacy.com HQ: Princeton, NJ, United StatesReported employees: 51-200 | Princeton, NJ, United States | 51-200 | Exact match | 59 contacts → |
“Legacy to Cloud-At Your Pace, Without the Risk.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Modern Systems An Advanced Companymodernsystems.oneadvanced.com HQ: Dallas, TX, United StatesReported employees: 51-200 | Dallas, TX, United States | 51-200 | Exact match | 56 contacts → |
“Modern Systems empowers efficiency, agility, and competitive advantage through core application modernization.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | HQ: Kirkland, WA, United StatesReported employees: 11-50 | Kirkland, WA, United States | 11-50 | Exact match | 55 contacts → |
“As a leading provider of software modernization services, TSRI enables technology readiness for the Cloud and other modern architecture environments.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Data Strategies Interchange, LLCgo-dsi.com HQ: Houston, TX, United StatesReported employees: 11-50 | Houston, TX, United States | 11-50 | Exact match | 31 contacts → |
“Data Strategies Interchange is a leading provider of large-scale data migration and conversion services to Fortune 500 and Global companies that need to upgrade from older…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Heirloom Computingheirloomcomputing.com HQ: Alamo, CA, United StatesReported employees: 51-200 | Alamo, CA, United States | 51-200 | Exact match | 29 contacts → |
“Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Iappsys INCiappsys.com HQ: San Diego, CA, United StatesReported employees: 11-50 | San Diego, CA, United States | 11-50 | Exact match | 23 contacts → |
“iAppSys: Experts in Enterprise Software, Cloud, and AI Innovation iAppSys is a trusted enterprise solutions provider with over 20 years of experience helping organizations…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Zengineszengines.ai HQ: Bedford, MA, United StatesReported employees: 11-50 | Bedford, MA, United States | 11-50 | Exact match | 19 contacts → |
“Zengines helps financial services enterprises position their data for AI, usable across every system change, and explainable across decades of legacy code.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Mertech Data Systems, INCmertechdata.com HQ: Pembroke Pines, FL, United StatesReported employees: 11-50 | Pembroke Pines, FL, United States | 11-50 | Exact match | 17 contacts → |
“Mertech is a leading provider of application development solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Platform Transitionplatformtransition.com HQ: Plantation, FL, United StatesReported employees: 11-50 | Plantation, FL, United States | 11-50 | Exact match | 15 contacts → |
“To say we're a data migration company would be an understatement.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | ITR Consultingitrtechsystems.com HQ: Arlington Heights, IL, United StatesReported employees: 201-500 | Arlington Heights, IL, United States | 201-500 | Exact match | 13 contacts → |
“ITR Consulting is a leading IT Services and Consulting firm helping organizations modernize, transform, and scale through secure, innovative technology solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Averisourceaverisource.com HQ: San Antonio, TX, United StatesReported employees: 51-200 | San Antonio, TX, United States | 51-200 | Exact match | 12 contacts → |
“At AveriSource, our mission is to help you achieve your legacy modernization objectives.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Streamfoundrystreamfoundry.com HQ: Newton, MA, United StatesReported employees: 11-50 | Newton, MA, United States | 11-50 | Exact match | 11 contacts → |
“SFI offers one of the most comprehensive portfolios of IBM Mainframe software expertise in North America.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Infinite Corporationinfinitecorporation.com HQ: Laguna Niguel, CA, United StatesReported employees: 51-200 | Laguna Niguel, CA, United States | 51-200 | Exact match | 10 contacts → |
“Infinite Corporation is the global leader in IBM i (AS/400) migration and modernization toolsets.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Updraft Worksupdraftworks.com HQ: Somerset, NJ, United StatesReported employees: 51-200 | Somerset, NJ, United States | 51-200 | Exact match | 9 contacts → |
“Unlocking Legacy Code with AI, Automated, Accurate, Future-Ready Updraft, powered by Natsoft, is an AI-driven legacy modernization platform that transforms complex, undocumented…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Datatek, INCdatatek-net.com HQ: Durham, NC, United StatesReported employees: 11-50 | Durham, NC, United States | 11-50 | Exact match | 8 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 22 | Expersolveexpersolve.com HQ: Tarrytown, NY, United StatesReported employees: 11-50 | Tarrytown, NY, United States | 11-50 | Exact match | 8 contacts → |
“Leaders in Systems Modernizations, our three decades of experience include winning several technology awards, a story on CBS's 60 Minutes, and many successful modernization…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Mimasoftmimasoft.org HQ: Alpharetta, GA, United StatesReported employees: 1-10 | Alpharetta, GA, United States | 1-10 | Exact match | 7 contacts → |
“Software Development, Application Development, App Development, Application Migration, Cloud Migration, App Modernization, Database Migration Solutions Architecting, Project…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Cleveris Technologiescleveris.com HQ: Houston, United StatesReported employees: 11-50 | Houston, United States | 11-50 | Exact match | 4 contacts → |
“Behind many successful organizations there are mature legacy applications at the core of vital business processes, and they are too valuable to be left behind.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 24 of 83 company matches
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Mainframe migration services: dataset insights
November 6, 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
83 records in the displayed employee bands.
0 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 worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 83 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: November 6, 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 ↗
Questions about this company list
What does Exact match mean for mainframe migration services?
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 migration services did RevenueBase find based in the United States?
The saved snapshot records 83 matching company records, 5,008 tracked contacts and 2,584 verified emails. The public preview displays 24 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: November 6, 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.
Related lists
Cite this list
RevenueBase Data Team. Top 24 mainframe migration services based in the United States. Snapshot: November 6, 2026. https://revenuebase.ai/companies/mainframe-migration-services/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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