Company lists · Data refreshed September 2026
Top 25 Audit and assurance outsourcing companies based in the United States
RevenueBase identified 210 audit and assurance outsourcing companies headquartered in the United States as of September 2026 and tracks 3,327 professional contacts across them, including 1,316 with verified work emails. New York is the largest hub.
This list covers audit and assurance outsourcing companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 audit and assurance outsourcing companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 324 contacts → | ||||
Partial evidence “For over 15 years, Makosi has been redefining what’s possible in the accounting and audit industry with cutting-edge, tech-powered workforce solutions.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 320 contacts → | ||||
Partial evidence “Unison Globus is a global accounting outsourcing and offshore staffing partner dedicated to supporting CPA firms and accounting professionals.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 252 contacts → | ||||
Strong evidence “SAPRO is a global, tech-enabled talent outsourcing firm specializing in Assurance, Tax, Advisory, and Client Accounting Services (CAS).” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 243 contacts → | ||||
Strong evidence “Headquartered in the Washington, DC metropolitan region, GRF CPAs & Advisors (GRF) is a full-service professional services firm providing clients with audit and assurance, tax…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 134 contacts → | ||||
Partial evidence “Cotton is an audit and accounting firm located in Old Town Alexandria, VA.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 114 contacts → | ||||
Indirect evidence “Since 1982, BGM has been fueled by an entrepreneurial spirit that matches the same passion for problem solving, innovation, and forward thinking displayed by our clients.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 92 contacts → | ||||
Indirect evidence “We are one of the leading offshore companies that offer the best in the industry staffing solutions to CPAs, accounting firms, and other companies.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 87 contacts → | ||||
Indirect evidence “Top accounting firm Raffa, P.C.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 85 contacts → | ||||
Partial evidence “We provide "full-service" financial accounting services, including compilations, reviews, and audits of financial statements for all sizes of closely held businesses, non-profit…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 62 contacts → | ||||
Partial evidence “Welcome to CRSP Connect, your trusted partner in outsourcing and offshore staffing solutions, tailored for Certified Public Accountants, Enrolled Agents, accounting firms, and…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 59 contacts → | ||||
Indirect evidence “PAAST (Perez-Abreu, Aguerrebere, Sueiro & Torres, PL) is a public accounting firm offering a full-line of services, including accounting, attestation, tax, financial due…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 53 contacts → | ||||
Indirect evidence “HeinfeldMeech is a premier auditing and consulting firm specializing in the service of governmental and nonprofit organizations.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 44 contacts → | ||||
Partial evidence “LEVITZACKS has been providing outstanding audit, review, compilation, domestic and international tax, management information, and management advisory services since 1964.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 43 contacts → | ||||
Indirect evidence “We are proud to be a solid, conservative, client-driven accounting firm focused on going the extra mile to serve our clients since 1975.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 41 contacts → | ||||
Partial evidence “McClintock & Associates offers a broad range of financial services, with a specialty in financial statement audits and student financial aid audits for the postsecondary education…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 41 contacts → | ||||
Indirect evidence “Our service team has a broad based local and national experience in the industries of professional services, technology & software, health care, alternative energy, e-commerce, as…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 41 contacts → | ||||
Indirect evidence “At HTL CPAs, we offer comprehensive accounting services to help businesses of all sizes achieve their financial goals.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 39 contacts → | ||||
Partial evidence “Accounting and Auditing Auditing service includes financial statement audit, compliance audit, internal audit and operation audit.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 37 contacts → | ||||
Partial evidence “AARC-360 is a firm of Certified Public Accountants and Advisors that combine deep insights gained across industries to provide Assurance, Advisory, Risk, and Compliance services.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 36 contacts → | ||||
Partial evidence “At AuditOne, we believe internal audit should do more than satisfy regulatory expectations, it should strengthen organizations, improve decision-making, and create lasting value.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 32 contacts → | ||||
Indirect evidence “At Lutz, Selig and Zeronda, L.L.P.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 31 contacts → | ||||
Indirect evidence “We empower financial growth by offering consumers and businesses a high level of auditing, accounting and tax services with a personal approach and rapid turnaround time.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 31 contacts → | ||||
Partial evidence “Lindquist LLP is a leading and award-winning certified public accounting firm that provides audit, accounting, compliance and consulting services.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 29 contacts → | ||||
Indirect evidence “We are a local Certified Public Accounting firm and have been a member of the business community for more than 40 years.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 28 contacts → | ||||
Indirect evidence “McMahan and Associates has been delivering professional services to clients throughout the United States for over fifty years.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: audit and assurance outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names audit and assurance outsourcing companies.
- Partial evidence
- Its own public description names part of audit and assurance outsourcing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name audit and assurance outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 210 audit and assurance outsourcing companies based in the United States
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Audit and assurance outsourcing companies based in the United States at a glance
As of Sep 27, 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 210 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among audit and assurance outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “audit and assurance outsourcing companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names audit and assurance outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among audit and assurance outsourcing companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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 listed company carries at least one verified work email, 1,316 across the full list. 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 27, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names audit and assurance outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many audit and assurance outsourcing companies are there based in the United States?
RevenueBase identified 210 audit and assurance outsourcing companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Makosi, headquartered in New York, tops this list with the largest team on record.
Which city has the most audit and assurance outsourcing companies?
New York leads with 12 headquartered companies, followed by Houston (9) and Atlanta (8).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,316 verified decision-maker contacts tracked across these 210 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 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 Smart Search, 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.
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