Company lists · Data refreshed September 2026

Top 25 Big 6 accounting firms based in Irvine, United States

Name: Big 6 accounting firms based in Irvine, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 42 companies tracked

RevenueBase identified 42 big 6 accounting firms headquartered in Irvine, United States as of September 2026 and tracks 1,269 professional contacts across them, including 572 with verified work emails. New York is the largest hub.

This list covers big 6 accounting firms headquartered in Irvine, 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 21, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

42Companies

1,269Contacts tracked

572Verified emails

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The 25 largest big 6 accounting firms based in Irvine, United States

Ranked by team size

Top 25 of 42 big 6 accounting firms based in Irvine, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to big 6 accounting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Lsl, LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	178 contacts →
	Indirect evidence “LSL provides solid guidance, support & solutions to businesses, governments and non-profits.” Source: RevenueBase Database · checked Sep 21, 2026
2	Haskell & White LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	133 contacts →
	Partial evidence “Haskell & White LLP is one of the largest independently owned accounting, auditing and tax consulting firms in Southern California, specializing in servicing public and private…” Source: RevenueBase Database · checked Sep 21, 2026
3	Wright Ford Young & CO	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	93 contacts →
	Partial evidence “We are a full service mezzanine accounting firm that provides an atmosphere where people can flourish in their careers, while at the same time, being able to have meaningful…” Source: RevenueBase Database · checked Sep 21, 2026
4	Squar Milner	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	501-1,000	84 contacts →
	Partial evidence “Squar Milner is one of the nation’s 40 largest accounting firms as well as one of the largest independent accounting and advisory firms in California.” Source: RevenueBase Database · checked Sep 21, 2026
5	Greengrowth Cpas	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	71 contacts →
	Indirect evidence “Welcome to GreenGrowth CPAs, your strategic partner dedicated to empowering businesses to achieve their full potential.” Source: RevenueBase Database · checked Sep 21, 2026
6	Redwitz, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	69 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
7	RJI Cpas	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	59 contacts →
	Partial evidence “RJI CPAs is a full-service accounting and consulting firm based in Irvine, California.” Source: RevenueBase Database · checked Sep 21, 2026
8	Davis Farr LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	57 contacts →
	Indirect evidence “Davis Farr is a full-service CPA firm specializing in governmental and nonprofit auditing, with offices in Irvine, Carlsbad, and Tacoma.” Source: RevenueBase Database · checked Sep 21, 2026
9	KBF Cpas	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	56 contacts →
	Indirect evidence “KBF is a fast-growing CPA firm that offers a comprehensive range of tax, assurance and advisory services.” Source: RevenueBase Database · checked Sep 21, 2026
10	Blythe Global Advisors	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	51 contacts →
	Partial evidence “Blythe Global Advisors is a full-spectrum accounting advisory firm with a difference.” Source: RevenueBase Database · checked Sep 21, 2026
11	Kieckhafer Schiffer LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	35 contacts →
	Indirect evidence “KS LLP professionals bring a breadth of experience and commitment to excellence to every client relationship.” Source: RevenueBase Database · checked Sep 21, 2026
12	Bharmal & Associates, INC	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	1-10	23 contacts →
	Partial evidence “We are no ordinary accounting firm.” Source: RevenueBase Database · checked Sep 21, 2026
13	Jc&company LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “JC & Company LLP is a professional firm committed to serving the needs of our clients.” Source: RevenueBase Database · checked Sep 21, 2026
14	White Nelson Diehl Evans LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	21 contacts →
	Partial evidence “White Nelson Diehl Evans LLP is a full-service accounting firm that prides itself on delivering personal service while supporting your most demanding global needs.” Source: RevenueBase Database · checked Sep 21, 2026
15	KMJ Corbin & Company	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	20 contacts →
	Partial evidence “KMJ provides accounting, auditing, tax and consulting services to public and private companies in the small to middle markets.” Source: RevenueBase Database · checked Sep 21, 2026
16	Afps LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “AFPS LLP is an independently owned tax, accounting, and auditing consulting firm located in Irvine, California and is recognized throughout Orange County as a leading authority in…” Source: RevenueBase Database · checked Sep 21, 2026
17	Smith Dickson, Certified Public Accountants, LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “Founded in 1982, Smith Dickson, Certified Public Accountants, LLP, is a full-service Southern California CPA firm that specializes in providing high-quality services designed to…” Source: RevenueBase Database · checked Sep 21, 2026
18	Maxwell & Company Cpa's, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	11 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
19	Mgo- Irvine Office	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	11 contacts →
	Indirect evidence “The Irvine operation will be part of a network of 16 MGO offices in major economic centers across the US, as well as the firm’s Global Centers of Excellence in Delhi and Bangalore…” Source: RevenueBase Database · checked Sep 21, 2026
20	Gonzalez CPA	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “Founded in 2001 Gonzalez CPA is a fully certified public accounting firm which has been practicing accounting, tax strategies, and management consulting for 15 years.” Source: RevenueBase Database · checked Sep 21, 2026
21	Areté Advisors	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “At Areté Advisors, we believe every client deserves expert financial guidance, not just at tax time, but throughout every stage of their business and personal financial journey.” Source: RevenueBase Database · checked Sep 21, 2026
22	NI TAX & Accounting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “NI TAX & ACCOUNTING is a full service accounting firm serving the Orange County at Southern California.” Source: RevenueBase Database · checked Sep 21, 2026
23	KDM Business Consulting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “KDM is a certified public accounting firm based in Orange County, CA.” Source: RevenueBase Database · checked Sep 21, 2026
24	Harris Greene LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “Harris Greene LLP is an accounting company based out of United States.” Source: RevenueBase Database · checked Sep 21, 2026
25	Bourque & Mclucas Cpas, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026

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: big 6 accounting firms. 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 big 6 accounting firms.
Partial evidence: Its own public description names part of big 6 accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big 6 accounting firms. 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 42 big 6 accounting firms based in Irvine, United States

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Big 6 accounting firms based in Irvine, United States at a glance

As of Sep 21, 2026

45.1%Verified-email coverage

30.2Average contacts per company

11-50Median size (employees)

535.7%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Irvine, so it is reported there. Company counts and contact totals on this page are exact for Irvine, over 42 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 big 6 accounting firms, 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 Irvine, United States whose own description of what they do matches “big 6 accounting firms”. 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 big 6 accounting firms), 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 big 6 accounting firms, and records with no verified work email. Companies headquartered outside Irvine 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, 572 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 21, 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.

Big 6 accounting firms by metro in the United States

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 big 6 accounting firms, 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 big 6 accounting firms are there based in Irvine, United States?

RevenueBase identified 42 big 6 accounting firms headquartered in Irvine, 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?

Lsl, LLP, headquartered in Irvine, tops this list with the largest team on record.

Which city has the most big 6 accounting firms?

New York leads with 225 headquartered companies, followed by Houston (131) and Chicago (106).

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 572 verified decision-maker contacts tracked across these 42 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 21, 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.