Company lists · Data refreshed September 2026

Top 25 Legacy system modernization companies based in Japan

RevenueBase identified 222 company matches for legacy system modernization companies associated with Japan as of September 2026 and tracks 42,139 professional contacts across them, including 4,459 with verified work emails. Jing is the largest hub.

This list covers company matches for legacy system modernization companies associated with Japan, 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 September 20, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 20, 2026 How this list was built
222Companies
42,139Contacts tracked
4,459Verified emails
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The 25 largest legacy system modernization companies based in Japan

Ranked by team size
Top 25 of 222 company matches for legacy system modernization companies based in Japan, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchTokyo, JapanHQ recorded Sep 20, 202610001+38,436 contacts →

Exact match

“NTT DATA – a part of NTT Group – IT and business services headquartered in Tokyo.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2Exact match渋谷区, JapanHQ recorded Sep 20, 20261,001-5,000294 contacts →

Exact match

“RAKUS has promoted digitalization of SMEs which have faced challenges of budget and digital literacy.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3Exact match千代田区, JapanHQ recorded Sep 20, 2026201-500221 contacts →

Exact match

“Regrit Partners is a team of professionals.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4Exact matchMinato-ku, JapanHQ recorded Sep 20, 2026n/a117 contacts →

Exact match

“MetroWorks offers services in the Information Technology field.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5Exact matchChuo, JapanHQ recorded Sep 20, 202611-5088 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6Exact match渋谷区, JapanHQ recorded Sep 20, 2026201-50087 contacts →

Exact match

“Information Strategy Technology, Inc.(IST), Pioneers of Digital Innovation, Mission Creating the future of businesses and society through strategic digital empowerment History…”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7Exact match新宿区, JapanHQ recorded Sep 20, 2026501-1,00068 contacts →

Exact match

“VTIAI1,800DX DCSDomainConsultingSolution DX ERPOdoo AIAIAIIoT IT24365 Made by VTIAI BFSI”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8Exact match品川区, JapanHQ recorded Sep 20, 202651-20063 contacts →

Exact match

“t\t\t\t\t\t”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9Exact match千代田区, JapanHQ recorded Sep 20, 202651-20050 contacts →

Exact match

“DX Urumo××DX”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10Exact matchMinato-ku, JapanHQ recorded Sep 20, 202651-20049 contacts →

Exact match

“Enterprise Systems.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11Exact matchTokyo, JapanHQ recorded Sep 20, 2026201-50047 contacts →

Exact match

“JP Tokyo is a leading management consulting and IT services firm, established in 2016 with a mission to empower global brands.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12Exact matchTokyo, JapanHQ recorded Sep 20, 202651-20035 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13Exact matchTokyo, JapanHQ recorded Sep 20, 202611-5034 contacts →

Exact match

“Based in Tokyo, Japan, Tokyo Techies is a one-stop IT consulting firm that provides clients with innovative solutions to all their business problems through digital transformation.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14Exact match川崎市幸区, JapanHQ recorded Sep 20, 20261,001-5,00034 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15Exact match千代田区, JapanHQ recorded Sep 20, 202651-20032 contacts →

Exact match

“ICONIC DATA is a consulting service provider on the theme of data-driven business transformation.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16Exact matchColombo, JapanHQ recorded Sep 20, 202611-5027 contacts →

Exact match

“We are a Digital Transformation Agency!”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17Exact matchMinato Ku, JapanHQ recorded Sep 20, 202611-5025 contacts →

Exact match

“CX #EX #DX #Zendesk #Clickup #Customerservice #Automation #HRtech #selfstorage VISIT https://storage.unwiredlogic.com/ for self-storage infomation!”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18Exact match千代田区, JapanHQ recorded Sep 20, 202651-20025 contacts →

Exact match

“ROUTE06 is a software company specializing in enterprise solutions and professional services.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19Exact match港区, JapanHQ recorded Sep 20, 202651-20025 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20Exact match千代田区, JapanHQ recorded Sep 20, 202611-5018 contacts →

Exact match

“IT\t\t\tWebWeb\t\t\t”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21Exact matchSuginami, JapanHQ recorded Sep 20, 202611-5017 contacts →

Exact match

“We are dedicated to being at the forefront of global software consulting and product development.”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22Exact match千代田区, JapanHQ recorded Sep 20, 2026n/a17 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23Exact match渋谷区, JapanHQ recorded Sep 20, 202651-20015 contacts →

Exact match

“DX4 magonote Go Works Go InsightAI Go analytics”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24Exact match港区, JapanHQ recorded Sep 20, 2026501-1,00015 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25Exact match横浜市西区北幸2丁目8-4, JapanHQ recorded Sep 20, 2026201-50015 contacts →

Exact match

“Mission Vision Value”

Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase

Showing 25 of 222 legacy system modernization companies based in Japan

See the full list, filter by size, metro and specialty, and access 4,459 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system modernization companies based in Japan at a glance

As of Sep 20, 2026
10.6%Verified-email coverage
189.8Average contacts per company
11-50Median size (employees)
27.0%Largest-city concentration · Jing
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
65
11-50
63
51-200
54
201-500
16
501-1,000
9
1,001-5,000
7
5,001-10,000
2
10001+
2

Email recency for this list is measured worldwide rather than for Japan, so it is reported there. Company counts and contact totals on this page are exact for Japan, over 222 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 Japan whose business descriptions match “legacy system modernization companies” 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 4,459 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 September 20, 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 “legacy system modernization companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system modernization companies are there based in Japan?

RevenueBase identified 222 company matches for legacy system modernization companies associated with Japan as of September 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?

NTT Data tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most legacy system modernization companies?

Jing leads with 60 company records, followed by Tokyo (20) and Xian (10).

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 4,459 professional contacts with verified work emails tracked across these 222 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 September 20, 2026.

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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.