Company lists · Data refreshed September 2026

Top 25 Professional services firms based in Irvine, United States

RevenueBase identified 113 professional services firms headquartered in Irvine, United States as of September 2026 and tracks 1,511 professional contacts across them, including 765 with verified work emails. New York is the largest hub.

This list covers professional services 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
113Companies
1,511Contacts tracked
765Verified emails
Unlock all 113 companies Free signup · no credit card · 500 free credits

The 25 largest professional services firms based in Irvine, United States

Ranked by team size
Top 25 of 113 professional services firms based in Irvine, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names professional services firms: 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.
#CompanyHeadquartersEmployeesContacts
1
Lsl, LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-200178

“LSL provides solid guidance, support & solutions to businesses, governments and non-profits.”

Source: company website · checked Sep 5, 2026
2
Haskell & White LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-200133

“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: company website · checked Sep 5, 2026
3
Wright Ford Young & COIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20093

“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: company website · checked Sep 5, 2026
4
Squar MilnerIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 2026501-1,00084

“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: company website · checked Sep 5, 2026
5
Greengrowth CpasIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20071

“Welcome to GreenGrowth CPAs, your strategic partner dedicated to empowering businesses to achieve their full potential.”

Source: company website · checked Sep 5, 2026
6
Omega Accounting SolutionsIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5070

“Omega Accounting Solutions is a financial and tax advisory based in Irvine, California that empowers small and medium-sized businesses (SMBs) to make better-informed decisions.”

Source: company website · checked Sep 5, 2026
7
Redwitz, INCIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20069
Source: company website · checked Sep 5, 2026
8
RJI CpasIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20059

“RJI CPAs is a full-service accounting and consulting firm based in Irvine, California.”

Source: company website · checked Sep 5, 2026
9
Davis Farr LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20057

“Davis Farr is a full-service CPA firm specializing in governmental and nonprofit auditing, with offices in Irvine, Carlsbad, and Tacoma.”

Source: company website · checked Sep 5, 2026
10
Blythe Global AdvisorsIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20051

“Blythe Global Advisors is a full-spectrum accounting advisory firm with a difference.”

Source: company website · checked Sep 5, 2026
11
Skinner Fouch & Olson LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5044

“Our purpose is to add value to the business of our clientele through transactional specific and organizational business advisory services.”

Source: company website · checked Sep 5, 2026
12
Tehrani & Velez, LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5041

“At Tehrani & Velez, we understand it takes commitment and dedication to make a positive difference in our clients' businesses.”

Source: company website · checked Sep 5, 2026
13Irvine, CA, United StatesHQ checked Sep 5, 202611-5040

“Gelman LLP, headquartered in Irvine, California, is a full-service accounting firm that responds to the financial and business needs of companies across all of Southern California.”

Source: company website · checked Sep 5, 2026
14
Kieckhafer Schiffer LLPStrong evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5035

“KS LLP professionals bring a breadth of experience and commitment to excellence to every client relationship.”

Source: company website · checked Sep 5, 2026
15Irvine, CA, United StatesHQ checked Sep 5, 202611-5024

“Business Attorneys”

Source: company website · checked Sep 5, 2026
16
Bharmal & Associates, INCIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 20261-1023

“We are no ordinary accounting firm.”

Source: company website · checked Sep 5, 2026
17
Jc&company LLPStrong evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5023

“JC & Company LLP is a professional firm committed to serving the needs of our clients.”

Source: company website · checked Sep 5, 2026
18Irvine, CA, United StatesHQ checked Sep 5, 202651-20021

“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: company website · checked Sep 5, 2026
19
Sagelight AccountingIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5021

“At Sagelight Accounting, we go beyond basic compliance.”

Source: company website · checked Sep 5, 2026
20
KMJ Corbin & CompanyIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5020

“KMJ provides accounting, auditing, tax and consulting services to public and private companies in the small to middle markets.”

Source: company website · checked Sep 5, 2026
21
Finch AccountingIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5015

“Finch is your one stop shop for all things accounting and finance.”

Source: company website · checked Sep 5, 2026
22
Afps LLPIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202611-5014

“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: company website · checked Sep 5, 2026
23Irvine, CA, United StatesHQ checked Sep 5, 202611-5012

“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: company website · checked Sep 5, 2026
24Irvine, CA, United StatesHQ checked Sep 5, 202651-20011
Source: company website · checked Sep 5, 2026
25
Mgo- Irvine OfficeIndirect evidence
Irvine, CA, United StatesHQ checked Sep 5, 202651-20011

“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: company website · checked Sep 5, 2026

Showing 25 of 113 professional services firms based in Irvine, United States

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Professional services firms based in Irvine, United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 593 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
61
11-50
37
51-200
13
201-500
1
501-1,000
1

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Irvine, over 113 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 professional services firms, 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: 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
Companies headquartered in Irvine, United States whose own description of what they do matches “professional services firms”. 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 professional services 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 an evidence 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, 765 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 5, 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.

Professional services firms by metro in the United States

Frequently asked

How many professional services firms are there based in Irvine, United States?

RevenueBase identified 113 professional services 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 professional services firms?

New York leads with 593 headquartered companies, followed by Houston (420) and Atlanta (304).

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 765 verified decision-maker contacts tracked across these 113 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 5, 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.