Company lists · Data refreshed September 2026

Top 25 Professional services firms based in Seattle, United States

RevenueBase identified 105 professional services firms headquartered in Seattle, United States as of September 2026 and tracks 2,963 professional contacts across them, including 1,278 with verified work emails. New York is the largest hub.

This list covers professional services firms headquartered in Seattle, 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
105Companies
2,963Contacts tracked
1,278Verified emails
Explore all 105 companies → Free signup · no credit card · 500 free credits

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

Ranked by team size
Top 25 of 105 professional services firms based in Seattle, 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
Moss AdamsIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202610001+2,425

“Moss Adams is now Baker Tilly, a leading advisory, tax, and assurance firm serving the middle market.”

Source: company website · checked Sep 5, 2026
2
HKP AdvisorsIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5043

“Hagen Kurth Perman, CPAs has been serving the Puget Sound region for more than 40 years.”

Source: company website · checked Sep 5, 2026
3
Greenwood Ohlund PSIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5038

“Greenwood Ohlund, PS founded in 1971, is a well-respected partner in the Seattle community.”

Source: company website · checked Sep 5, 2026
4
AMP Services, LLCStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 202651-20029

“AMP Services, LLC is an Accounting, Management consulting, and Professional services firm for multi-unit restaurant and retail companies.”

Source: company website · checked Sep 5, 2026
5
Zachary ScottIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5019

“Zachary Scott was founded in 1991 with a simple goal – be a trustworthy partner and advisor for privately-held business owners and managers to help them build their businesses…”

Source: company website · checked Sep 5, 2026
6
R.D. Barnett PllcIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5015

“R.D.”

Source: company website · checked Sep 5, 2026
7
The Apex LAW Group PllcIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-1015

“The Apex Law Group is a business and corporate law firm that represents businesses across the spectrum from for-profit to non-profit to hybrid entities like social purpose…”

Source: company website · checked Sep 5, 2026
8
Ranta CPA AssociatesIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5015

“Seattle-based CPA firm, with an emphasis on income tax preparation and business services.”

Source: company website · checked Sep 5, 2026
9
Finney Neill & Company, P.SIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5014

“Finney, Neill & Company, P.S.”

Source: company website · checked Sep 5, 2026
10
NTH Degree CpasIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-1013

“We understand that all businesses start with people and ideas.”

Source: company website · checked Sep 5, 2026
11
Camber Consulting LLCIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5013

“Camber Consulting LLC was founded in 2011 with the goal of providing specialized finance, accounting, and IT project management services to clients in the Pacific Northwest and…”

Source: company website · checked Sep 5, 2026
12
Hawthorne & Co. CpasIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5012

“Hawthorne & Co.”

Source: company website · checked Sep 5, 2026
13
Hunt Jackson, PllcStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5011

“The principals and employees of Hunt Jackson, PLLC are committed to operating a full-service accounting firm that blends the in-depth competence of seasoned professionals with the…”

Source: company website · checked Sep 5, 2026
14
King & Oliason PllcIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5010

“King & Oliason is a Seattle tax accounting firm specializing in tax consulting and tax return preparation for high net worth individuals, their families, non-profit organizations…”

Source: company website · checked Sep 5, 2026
15Seattle, WA, United StatesHQ checked Sep 5, 20261-1010

“We Believe That Long-Term Customer Satisfaction Is The Cornerstone Of Our Success.”

Source: company website · checked Sep 5, 2026
16
Francis & Company PllcStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-109

“Francis & Company PLLC is quality-oriented, client-centered professional services firm providing audit, financial management, consulting, and accounting expertise in the greater…”

Source: company website · checked Sep 5, 2026
17
Pretty BooksIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-109

“Pretty Books offers accounting, bookkeeping, payroll, and tax services to small business clients around the country.”

Source: company website · checked Sep 5, 2026
18Seattle, WA, United StatesHQ checked Sep 5, 20261-108

“Tax Planning & Preparation - Keep more of your hard-earned money with sound, strategic tax planning and preparation support.”

Source: company website · checked Sep 5, 2026
19
Watson McdonellIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-508

“We are a full-service CPA firm licensed in Washington.”

Source: company website · checked Sep 5, 2026
20
Minar Northey, LLPIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-507

“Minar Northey, CPA’s is a company based out of 100 W HARRISON ST, Seattle, Washington, United States.”

Source: company website · checked Sep 5, 2026
21
Allen KOE PllcIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-107

“Business Taxation and Assurance Services”

Source: company website · checked Sep 5, 2026
22
Tremper & Co., LLPIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“Tremper and Company, LLP has been serving businesses and individual in the Pacific Northwest since its founding in 1946.”

Source: company website · checked Sep 5, 2026
23
Banyan Legal CounselIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“At Banyan Legal Counsel, our philosophy begins with our name.”

Source: company website · checked Sep 5, 2026
24
The Myers Associates, P.CIndirect evidence
Seattle, United StatesHQ checked Sep 5, 20261-104

“At The Myers Associates we believe in the value of relationships.”

Source: company website · checked Sep 5, 2026
25Seattle, United StatesHQ checked Sep 5, 20261-103

“For over 30 years, our firm has been providing quality, personalized financial guidance to local individuals and businesses.”

Source: company website · checked Sep 5, 2026

Showing 25 of 105 professional services firms based in Seattle, United States

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Professional services firms based in Seattle, 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
82
11-50
20
51-200
2
10001+
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 Seattle, over 105 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 Seattle, 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 Seattle 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, 1,278 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 Seattle, United States?

RevenueBase identified 105 professional services firms headquartered in Seattle, 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?

Moss Adams, headquartered in Seattle, 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 1,278 verified decision-maker contacts tracked across these 105 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.