Company lists · Data refreshed September 2026

Top 25 Due diligence consulting companies based in the United States

RevenueBase identified 249 company matches for due diligence consulting companies associated with the United States as of September 2026 and tracks 2,601 professional contacts across them, including 1,078 with verified work emails. New York is the largest hub.

This list covers company matches for due diligence consulting companies 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 September 19, 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 19, 2026 How this list was built
249Companies
2,601Contacts tracked
1,078Verified emails
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The 25 largest due diligence consulting companies based in the United States

Ranked by team size
Top 25 of 249 company matches for due diligence consulting companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 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 matchHowell, NJ, United StatesHQ recorded Sep 19, 2026n/a241 contacts →

Exact match

“We know you work hard to get the best deal possible.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2Exact matchChicago, IL, United StatesHQ recorded Sep 19, 202651-200187 contacts →

Exact match

“DPO & Co specializes in helping Private Equity firms and their portfolio companies gain fact-based insights during the diligence process and realize post-close synergies and value…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3Exact matchTampa, FL, United StatesHQ recorded Sep 19, 202651-200181 contacts →

Exact match

“Maximizing Value.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202651-200168 contacts →

Exact match

“For over 25 years, IGS has helped investors and management teams make better, faster decisions, from commercial due diligence, to growth strategy, pricing, and go-to-market…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5Exact matchNew York, NY, United StatesHQ recorded Sep 19, 202651-20075 contacts →

Exact match

“Blue Heron Research Partners is an international leader in qualitative due diligence.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6Exact matchMoorestown, NJ, United StatesHQ recorded Sep 19, 202651-20068 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7Exact matchMedford, OR, United StatesHQ recorded Sep 19, 202611-5067 contacts →

Exact match

“Ashland Partners & Company LLP is a PCAOB registered, specialty CPA firm providing due diligence solutions to the investment management industry.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8Exact matchGrayslake, IL, United StatesHQ recorded Sep 19, 202651-20064 contacts →

Exact match

“LM Consultants, Inc.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9Exact matchCincinnati, OH, United StatesHQ recorded Sep 19, 202611-5062 contacts →

Exact match

“Live investigator-led analysis is the best way to minimize regulatory, reputational and financial risks.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10Exact matchSanta Monica, CA, United StatesHQ recorded Sep 19, 202651-20049 contacts →

Exact match

“Ironsides is an M&A advisory firm focused exclusively on providing transaction services including financial and accounting due diligence, tax due diligence and structuring…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11Exact matchDallas, TX, United StatesHQ recorded Sep 19, 202651-20049 contacts →

Exact match

“Columbia Advisory Group is a Dallas, Texas based Information Technology consulting firm focused on providing Information Technology due diligence, strategic assessment and…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12Exact matchLos Angeles, CA, United StatesHQ recorded Sep 19, 20261,001-5,00047 contacts →

Exact match

“On the leading edge of innovation in commercial real estate transactions, GRS an NV5 Company is one of the largest national provider CRE due diligence services.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13Exact matchNew York, NY, United StatesHQ recorded Sep 19, 202651-20042 contacts →

Exact match

“Hilton Global Associates is a professional investigative research firm providing expert due diligence and unparalleled client service.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-5037 contacts →

Exact match

“Fairmont Consulting Group is a Boston-based firm focused on due diligence and strategic advisory services for clients active in aerospace, defense, government services, and the…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15Exact matchSan Francisco, CA, United StatesHQ recorded Sep 19, 202611-5037 contacts →

Exact match

“CDS is now part of CrossCountry Consulting.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16Exact matchVienna, VA, United StatesHQ recorded Sep 19, 202611-5033 contacts →

Exact match

“Pipaya has joined Prosperity Partners!”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17Exact matchColumbia, MD, United StatesHQ recorded Sep 19, 202611-5027 contacts →

Exact match

“Our law firm combines highly specialized legal expertise with business and financial acumen, which allows us to provide our clients with focused intelligence and due diligence on…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18Exact matchEden Prairie, MN, United StatesHQ recorded Sep 19, 202611-5022 contacts →

Exact match

“FactRight is the premier source of credible perspective and advice for wealth managers seeking access to alternative investments.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19Exact matchDallas/fort Worth, MI, United StatesHQ recorded Sep 19, 202611-5020 contacts →

Exact match

“SCA Transaction Services LLC provides accounting due diligence and other transaction advisory services to private equity groups, lenders and corporations.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20Exact matchArlington, VA, United StatesHQ recorded Sep 19, 202611-5019 contacts →

Exact match

“We have helped dozens of clients gain insight into critical areas of concern by thoroughly reviewing their target company’s information and asking intelligent questions.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21Exact matchSeattle, WA, United StatesHQ recorded Sep 19, 202611-5019 contacts →

Exact match

“Tech DNA Is a global leader in technology due diligence.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22Exact matchChicago, IL, United StatesHQ recorded Sep 19, 202611-5018 contacts →

Exact match

“Founded in 1991, GTG Consultants, Inc.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23Exact matchNashville, TN, United StatesHQ recorded Sep 19, 202611-5018 contacts →

Exact match

“Moore-McNeil, LLC (“Moore-McNeil”) is an insurance consulting firm with extensive experience in providing due diligence and outsourced risk management services.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24Exact matchDallas, TX, United StatesHQ recorded Sep 19, 202611-5017 contacts →

Exact match

“Targus Associates specializes in environmental due diligence services for acquisitions and financing of commercial real estate and related consulting services.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25Exact matchNew York, NY, United StatesHQ recorded Sep 19, 202611-5016 contacts →

Exact match

“Since 1998, Velocity Consulting, Inc.(“Velocity”) has provided a full range of real estate due diligence services including Phase I ESAs, Property Condition Assessments…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

Showing 25 of 249 due diligence consulting companies based in the United States

See the full list, filter by size, metro and specialty, and access 1,078 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Due diligence consulting companies based in the United States at a glance

As of Sep 19, 2026
41.4%Verified-email coverage
10.4Average contacts per company
1-10Median size (employees)
9.2%Largest-city concentration · New York
Sep 19, 2026Page data refreshed

Companies by employee count

1-10
159
11-50
73
51-200
16
1,001-5,000
1

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 249 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 “due diligence consulting 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 1,078 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 19, 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 “due diligence consulting companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many due diligence consulting companies are there based in the United States?

RevenueBase identified 249 company matches for due diligence consulting companies associated with the United States 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?

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

Which city has the most due diligence consulting companies?

New York leads with 23 company records, followed by Chicago (12) and Los Angeles (8).

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 1,078 professional contacts with verified work emails tracked across these 249 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 19, 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.