Company lists · Data refreshed September 2026

Top 25 Global HR consulting firms based in Seattle, United States

Name: Global HR consulting firms based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 91 companies tracked

RevenueBase identified 91 global HR consulting firms headquartered in Seattle, United States as of September 2026 and tracks 795 professional contacts across them, including 288 with verified work emails. Across the United States, New York is the largest hub for this category (666 companies); Seattle has 91.

This list covers global HR consulting 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 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 30, 2026 86% judged on-target in blind review

91Companies

795Contacts tracked

288Verified emails

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The 25 largest global HR consulting firms based in Seattle, United States

Ranked by team size

Top 25 of 91 global HR consulting firms based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to global HR consulting 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	Wimmer Solutions	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	501-1,000	262 contacts →
	Indirect evidence “We help you to see the full picture, bringing our experts together with you to co-develop approaches and operationalize plans across the dimension of strategy, people, process…” Source: RevenueBase Database · checked Sep 30, 2026
2	TWO Degrees	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	n/a	99 contacts →
	Indirect evidence “LOVE YOUR WORK AND LIFE.” Source: RevenueBase Database · checked Sep 30, 2026
3	The Institute For Corporate Productivity I4cp	Strong evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	51-200	94 contacts →
	Strong evidence “The Institute for Corporate Productivity (i4cp) is the leading global research and consulting firm dedicated to helping organizations build high-performance organizations.” Source: RevenueBase Database · checked Sep 30, 2026
4	Waldron CPI NOW Sparkeffect	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	51-200	29 contacts →
	Indirect evidence “Waldron CPI (a Career Partners International affiliate) is now SparkEffect.” Source: RevenueBase Database · checked Sep 30, 2026
5	Forum Solutions LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	28 contacts →
	Partial evidence “Forum Solutions is a management consulting firm partnering with leaders to turn strategy into results and disruption into lasting advantage.” Source: RevenueBase Database · checked Sep 30, 2026
6	Highbrow LLC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	28 contacts →
	Indirect evidence “Highbrow LLC" has been founded by professionals having deep industry experience.” Source: RevenueBase Database · checked Sep 30, 2026
7	Plum Coaching & HR Consulting	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	20 contacts →
	Partial evidence “Plum provides a range of HR services, as well as career-related coaching.” Source: RevenueBase Database · checked Sep 30, 2026
8	Oxygen EXP	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	17 contacts →
	Partial evidence “Oxygen is a boutique consulting services firm that drives business growth for corporate enterprise and mid-market companies.” Source: RevenueBase Database · checked Sep 30, 2026
9	The Steve Trautman CO	Indirect evidence	Seattle, United StatesHQ checked Sep 30, 2026	11-50	10 contacts →
	Indirect evidence “At STC, we work at the intersection of business strategy and talent risk management, helping leaders identify and mitigate risks during critical transformations.” Source: RevenueBase Database · checked Sep 30, 2026
10	AGG	Indirect evidence	Seattle, United StatesHQ checked Sep 30, 2026	1-10	10 contacts →
	Indirect evidence “AGG is a husband-wife team operating out of West Seattle with over 25 years’ experience in manufacturing recruiting & marketing and offering job seekers professional services such…” Source: RevenueBase Database · checked Sep 30, 2026
11	Regroup	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	8 contacts →
	Indirect evidence “At Regroup (regroup.co), we help innovative companies develop leaders, managers, teams, and culture.” Source: RevenueBase Database · checked Sep 30, 2026
12	Devselect, LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	8 contacts →
	Partial evidence “DevSelect is a Managerial and Technical consultancy with a long history of process-driven consulting and staffing.” Source: RevenueBase Database · checked Sep 30, 2026
13	Sodo Consulting	Partial evidence	Seattle, United StatesHQ checked Sep 30, 2026	1-10	8 contacts →
	Partial evidence “Welcome to Sodo Consulting: Your Source for Leadership, Organizational and Team Development Excellence Is it time to turn your goals into reality?” Source: RevenueBase Database · checked Sep 30, 2026
14	HR Group International	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	6 contacts →
	Indirect evidence “Human Resources Group International, Inc.(HRGI) is a group of Human Resources consultants with over 25 years of experience in the field providing comprehensive human resources…” Source: RevenueBase Database · checked Sep 30, 2026
15	Nofsinger Group	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	5 contacts →
	Indirect evidence “At the senior leadership level, often only the most experienced, trusted advisers can add value and be a thought-partner for growth.” Source: RevenueBase Database · checked Sep 30, 2026
16	Tandem Motion	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	4 contacts →
	Partial evidence “We are a boutique workforce strategy consulting firm focused on aligning culture, people, structure, and human capital metrics with the business strategy.” Source: RevenueBase Database · checked Sep 30, 2026
17	Consilium Group	Strong evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	11-50	4 contacts →
	Strong evidence “Consilium Group, in combination with its sister firm LMC Consulting, is a premier Pacific Northwest based management consulting firm offering the experience of a global consulting…” Source: RevenueBase Database · checked Sep 30, 2026
18	Talentlign INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	4 contacts →
	Indirect evidence “When it comes to unlocking the full potential of your workforce, one size does not fit all.” Source: RevenueBase Database · checked Sep 30, 2026
19	Thomas Goldstein Associates	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “We are talent architects, problem solvers, and trusted thought partners for mission-driven companies, agencies, and leaders.” Source: RevenueBase Database · checked Sep 30, 2026
20	Ghost Mountain Executive Search	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “Leadership solutions for top-tier organizations.” Source: RevenueBase Database · checked Sep 30, 2026
21	BIG House Consulting	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “Most companies don't lack talent or ideas.” Source: RevenueBase Database · checked Sep 30, 2026
22	Open Gate Consulting	Indirect evidence	Seattle, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “Our most important priority is you – the business leader.” Source: RevenueBase Database · checked Sep 30, 2026
23	Scontrino-Powell	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “We help leaders make the workplace work.” Source: RevenueBase Database · checked Sep 30, 2026
24	Trillium Hiring Services	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Partial evidence “Delivering Talent Management Strategy, Hiring Process Consulting and Tactical Execution for stage appropriate growth.” Source: RevenueBase Database · checked Sep 30, 2026
25	Coliistico	Partial evidence	Seattle, WA, United StatesHQ checked Sep 30, 2026	1-10	3 contacts →
	Partial evidence “With multiple specialties and broad expertise, the Coliistico team takes a whole approach to delivering sound management consulting solutions and guidance to companies and their…” Source: RevenueBase Database · checked Sep 30, 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: global HR consulting 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 global HR consulting firms.
Partial evidence: Its own public description names part of global HR consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name global HR consulting 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 91 global HR consulting firms based in Seattle, United States

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Global HR consulting firms based in Seattle, United States at a glance

As of Sep 30, 2026

36.2%Verified-email coverage

8.7Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 91 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 global HR consulting 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 Seattle, United States whose own description of what they do matches “global HR consulting 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 global HR consulting 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 global HR consulting 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 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, 288 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 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.

Global HR consulting 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 global HR consulting 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 global HR consulting firms are there based in Seattle, United States?

RevenueBase identified 91 global HR consulting 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?

Wimmer Solutions, headquartered in Seattle, tops this list with the largest team on record.

Which city in the United States has the most global HR consulting firms?

New York leads the United States with 666 headquartered companies, followed by Atlanta (335) and Chicago (303). Seattle has 91.

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 288 verified decision-maker contacts tracked across these 91 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 30, 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.