Company lists · Data refreshed August 2026

Top 25 Accounting outsourcing companies based in New York, United States

There are 169 accounting outsourcing companies headquartered in New York, United States (RevenueBase, August 2026). RevenueBase tracks 1,893 professional contacts across them, including 375 with verified work emails and 331 with mobile numbers. New York is the largest hub.

This list covers accounting outsourcing companies headquartered in New York, 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, how directly it supports the match, and when it was last checked. Data refreshed August 30, 2026.

169Companies
1,893Contacts tracked
375Verified emails
331Mobile numbers
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The 25 largest accounting outsourcing companies based in New York, United States

Ranked by team size
Top 25 of 169 accounting outsourcing companies based in New York, United States, ranked by team size, largest first. Data refreshed Aug 30, 2026. Evidence rates how directly each company's own description names accounting outsourcing companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContactsVerified emails
1

“Outsource Partners International (OPI) is a professional services firm dedicated to the outsourcing of finance, accounting, and analytics business processes.”

Source: company website · checked Aug 30, 2026
New York, NY, United States1,001-5,0003986
2
Mindspace OutsourcingStrong evidence

“Mindspace Outsourcing, established in 2007, and offers bookkeeping outsourcing and accounting services to individuals and small to medium-sized businesses in the United States…”

Source: company website · checked Aug 30, 2026
New York, NY, United States51-2001552
3
SourceinPartial evidence

“SourceIN helps global businesses build finance and accounting operations they can trust.”

Source: company website · checked Aug 30, 2026
New York, NY, United States201-50014380
4

“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: company website · checked Aug 30, 2026
New York, NY, United States51-200926
5
BTQ FinancialIndirect evidence

“Consero Global Acquires BTQ Financial, Expanding Its Reach to the Non-Profit World With a Leading Provider of Finance as a Service to the Sector.”

Source: company website · checked Aug 30, 2026
New York, NY, United States51-2008739
6
Karma CPA Services LLPPartial evidence

“Our accounting team utilizes online technology to help scale up your business by managing your Bookkeeping and Accounting, with a personalized touch.”

Source: company website · checked Aug 30, 2026
New York, United States51-200642
7

“We offer a wide range of custom accounting, bookkeeping and consulting services: Tax Accounting Services, Bookkeeping, Consulting Services, Payroll, Report Generation, QuickBooks…”

Source: company website · checked Aug 30, 2026
New York, NY, United States51-2006319
8

“We take the complication out of any business.”

Source: company website · checked Aug 30, 2026
New York, NY, United States201-5006141
9
Unloop AccountingPartial evidence

“Unloop is the first and only accounting firm exclusively servicing ecommerce and inventory businesses in the US and Canada.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-50432
10

“Nongmin Consultancy Services (HireNCS) is a trusted partner for small and medium businesses, offering expert accounting & bookkeeping services.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-50307
11
Caroprese & CompanyStrong evidence

“Caroprese & Company is a strategic certified public accounting firm delivering tailored accounting, tax, advisory, and business process outsourcing solutions that help businesses…”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-502918
12
The RMG GroupPartial evidence

“The RMG Group provides comprehensive internal accounting support for small to mid-market businesses, startups, entrepreneurs, and sole proprietors.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-502515
13
Mighty Digits AccountingPartial evidence

“We help great businesses get their Finance & Accounting in order.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-502310
14
K9 BookkeepingIndirect evidence

“There's a reason so many people are choosing to scuttle their billing departments and move to a virtual bookkeeping solution: it's more efficient and cost effective.”

Source: company website · checked Aug 30, 2026
New York, NY, United States51-200193
15
Ursa ConsultantsIndirect evidence

“Working with Ursa Consultants is more than a partnership.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-501812
16
ProfitlinePartial evidence

“The Profit Line is a leading bookkeeping firm in NYC, specializing in outsourced bookkeeping, accounting, back office & controller services to small businesses and nonprofits.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-50117
17
HammockIndirect evidence

“At Hammock, we believe entrepreneurs and business owners prefer finance services that are simple, insightful, and supported by data.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-50106
18
Relig Solutions INCIndirect evidence

“RELIG is an abbreviation of the word Religion.”

Source: company website · checked Aug 30, 2026
New York, NY, United States201-50074
19
OS SolutionsPartial evidence

“Our mission at OS Solutions is to keep costs minimal and possibilities maximal by providing outstanding outsourcing that is cost effective across all industries.”

Source: company website · checked Aug 30, 2026
New York, United States51-20073
20
Tempcfo, INCIndirect evidence

“From Seed to Exit!”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-5071
21
Dbooks NYIndirect evidence

“Whether you're a small business owner, a manager at a mid-sized corporation, or a self-employed freelancer, the team at dbooks bookkeeping is at your service.”

Source: company website · checked Aug 30, 2026
New York, United States11-5065
22
EgrowthcIndirect evidence

“Growth within reach!”

Source: company website · checked Aug 30, 2026
New York, United States11-5064
23

“MBS Accounting Technology & Advisory (MBSATA) provides an extensive range of accounting services to businesses and high net worth individuals using the most advanced tools in…”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-5063
24
Nucleus DNAPartial evidence

“Discover the power of our comprehensive, full-service accounting solutions.”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-5062
25
Fullridge AdvisorsPartial evidence

Accounting & Tax: Book-keeping, month-end accounting close, GAAP alignment, financial reporting, preparation of account reconciliations, historical financial cleanup, audit prep…”

Source: company website · checked Aug 30, 2026
New York, NY, United States11-5052

Showing 25 of 169 accounting outsourcing companies based in New York, United States

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Accounting outsourcing companies based in New York, United States at a glance

As of Aug 30, 2026
1-10Median size (employees)
New YorkLargest hub · 169 HQs
331Contacts with mobile numbers
Aug 30, 2026Data refreshed

Companies by employee count

1-10
104
11-50
43
51-200
16
201-500
4
1,001-5,000
1

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 accounting outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
What qualifies
Companies headquartered in New York, United States whose own description of what they do matches “accounting outsourcing companies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among accounting outsourcing companies, and records with no verified work email. Companies headquartered outside New York 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 an evidence rating so you can judge each match yourself.
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, 375 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 August 30, 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

How many accounting outsourcing companies are there based in New York, United States?

There are 169 accounting outsourcing companies headquartered in New York, United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Outsource Partners International Alumni, headquartered in New York, tops this list with the largest team on record.

Which city has the most accounting outsourcing companies?

New York leads with 169 headquartered companies, followed by Houston (126) and Los Angeles (100).

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 375 verified decision-maker contacts tracked across these 169 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.