Company lists · Data refreshed September 2026

Top 25 Research and development staffing companies based in the United States

RevenueBase identified 4,230 research and development staffing companies headquartered in the United States as of September 2026 and tracks 113,081 professional contacts across them, including 20,509 with verified work emails. New York is the largest hub.

This list covers research and development staffing companies headquartered in the 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 29, 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 29, 2026 86% judged on-target in blind review
4,230Companies
113,081Contacts tracked
20,509Verified emails
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The 25 largest research and development staffing companies based in the United States

Ranked by team size
Top 25 of 4,230 research and development staffing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to research and development staffing companies: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceBoston, MA, United StatesHQ checked Sep 29, 20261,001-5,0003,238 contacts →

Partial evidence

“Beacon Hill was founded to set a new standard in search, career placement and flexible staffing.”

Source: RevenueBase Database · checked Sep 29, 2026
2Indirect evidenceHouston, TX, United StatesHQ checked Sep 29, 2026501-1,0002,128 contacts →

Indirect evidence

“We support STEM professionals looking for jobs with exceptional firms in the technology and engineering sectors.”

Source: RevenueBase Database · checked Sep 29, 2026
3Partial evidenceChesterfield, MO, United StatesHQ checked Sep 29, 20265,001-10,0002,061 contacts →

Partial evidence

“Rose International is a leading provider of Staffing and Total Talent Solutions to corporations and government agencies, employing thousands of people across the U.S, Canada and…”

Source: RevenueBase Database · checked Sep 29, 2026
4Indirect evidenceChicago, IL, United StatesHQ checked Sep 29, 20261,001-5,0001,840 contacts →

Indirect evidence

“Addison Group provides comprehensive talent solutions and consulting services across diverse practice areas, including Non-Clinical Healthcare, Information Technology (IT), Human…”

Source: RevenueBase Database · checked Sep 29, 2026
5Indirect evidenceChicago, IL, United StatesHQ checked Sep 29, 2026501-1,0001,753 contacts →

Indirect evidence

“Medix provides workforce solutions to clients and creates opportunity for talent in the Healthcare, Life Sciences, Engineering and Technology fields.”

Source: RevenueBase Database · checked Sep 29, 2026
6Indirect evidenceMayfield Heights, OH, United StatesHQ checked Sep 29, 2026501-1,0001,599 contacts →

Indirect evidence

“Companies need talent.”

Source: RevenueBase Database · checked Sep 29, 2026
7Indirect evidencePlymouth, MI, United StatesHQ checked Sep 29, 20261,001-5,0001,545 contacts →

Indirect evidence

“Infotree Global was founded in 2002 in a small office in Canton, MI, Infotree Global had a clear mission; To bring the world’s best talent together with the greatest companies…”

Source: RevenueBase Database · checked Sep 29, 2026
8Indirect evidenceAndover, MA, United StatesHQ checked Sep 29, 2026201-5001,480 contacts →

Indirect evidence

“ALKU® is a highly specialized consulting services firm focused on deploying highly skilled consulting resources in the areas of Technologies, HCIT, Life Sciences, and Government…”

Source: RevenueBase Database · checked Sep 29, 2026
9Indirect evidenceIndianapolis, IN, United StatesHQ checked Sep 29, 20261,001-5,0001,480 contacts →

Indirect evidence

“At Brooksource, relationships are at the center of everything we do.”

Source: RevenueBase Database · checked Sep 29, 2026
10Partial evidencePittsburgh, PA, United StatesHQ checked Sep 29, 20265,001-10,0001,386 contacts →

Partial evidence

“System One is a leading provider of specialized, highly technical outsourced services, workforce solutions, staffing, and recruiting to critical infrastructure, technology, life…”

Source: RevenueBase Database · checked Sep 29, 2026
11Partial evidenceGreenville, United StatesHQ checked Sep 29, 2026201-5001,187 contacts →

Partial evidence

“TRS Staffing Solutions is a world leading engineering recruitment agency specialising in the recruitment and supply of professional, engineering, technical and field talent.”

Source: RevenueBase Database · checked Sep 29, 2026
12Partial evidenceRaleigh, NC, United StatesHQ checked Sep 29, 20261,001-5,0001,088 contacts →

Partial evidence

“Founded in 2012, Planet Pharma is a global leader in life sciences recruitment and staffing, specializing in Pharmaceuticals, Biotechnology, Medical Device, Labs & Healthcare…”

Source: RevenueBase Database · checked Sep 29, 2026
13Partial evidenceRound Rock, TX, United StatesHQ checked Sep 29, 2026n/a955 contacts →

Partial evidence

“Career Strategies is a full service staffing firm specializing in Property Management, Healthcare and Professional Services recruitment.”

Source: RevenueBase Database · checked Sep 29, 2026
14Partial evidenceAtlanta, GA, United StatesHQ checked Sep 29, 20261,001-5,000901 contacts →

Partial evidence

“RemX is the professional staffing division of EmployBridge, a $3 billion staffing organization with more than 600 offices in the U.S.”

Source: RevenueBase Database · checked Sep 29, 2026
15Partial evidenceEdison, NJ, United StatesHQ checked Sep 29, 2026501-1,000762 contacts →

Partial evidence

“Integrated Resources Inc.(IRI) is a professional staffing firm specializing in contract, consulting & full time positions in the area of Information Technology, Life Science and…”

Source: RevenueBase Database · checked Sep 29, 2026
16Indirect evidenceSterling, VA, United StatesHQ checked Sep 29, 20261,001-5,000732 contacts →

Indirect evidence

“Headquartered in Washington DC Metro Area, Cynet Systems is a top talent supplier for companies across North America.”

Source: RevenueBase Database · checked Sep 29, 2026
17Indirect evidenceSan Jose, CA, United StatesHQ checked Sep 29, 20261,001-5,000711 contacts →

Indirect evidence

“VARITE has a definite spirit.”

Source: RevenueBase Database · checked Sep 29, 2026
18Partial evidenceKalamazoo, MI, United StatesHQ checked Sep 29, 20261,001-5,000653 contacts →

Partial evidence

“Trillium Staffing Solutions is an employment service specializing in staffing, training, testing, on-site services, human resources and safety consulting.”

Source: RevenueBase Database · checked Sep 29, 2026
19Partial evidenceLivonia, MI, United StatesHQ checked Sep 29, 20261,001-5,000636 contacts →

Partial evidence

“With singular global reach and agility, Acro Service Corporation offers you a unique integrated approach to staffing and consulting solutions.”

Source: RevenueBase Database · checked Sep 29, 2026
20Indirect evidenceBirmingham, AL, United StatesHQ checked Sep 29, 202610001+624 contacts →

Indirect evidence

“Automation Personnel Services was founded in Birmingham, AL almost 30 years ago and has expanded coast to coast with 40 Branch offices in eleven states.”

Source: RevenueBase Database · checked Sep 29, 2026
21Partial evidenceNew York, NY, United StatesHQ checked Sep 29, 2026501-1,000614 contacts →

Partial evidence

“Mitchell Martin Inc.(MMI) is one of the largest employee-owned staffing firms in the U.S, specializing in IT, healthcare, healthcare IT, accounting and finance, and professional…”

Source: RevenueBase Database · checked Sep 29, 2026
22Partial evidenceAlpharetta, GA, United StatesHQ checked Sep 29, 2026501-1,000591 contacts →

Partial evidence

“CodeForce 360 is a growing IT staffing company which thrives on a seasoned team of IT experts, a palpable international presence, and the ability to leverage the best of…”

Source: RevenueBase Database · checked Sep 29, 2026
23Indirect evidenceOrange, CA, United StatesHQ checked Sep 29, 20265,001-10,000584 contacts →

Indirect evidence

“A Six Sigma Company ~61 years in the industry ~Nationwide 4 million+ candidate database ~Fortune Company ~Extensive E-Recruiting capabilities ~Reference and Employment check…”

Source: RevenueBase Database · checked Sep 29, 2026
24Partial evidenceBrookfield, WI, United StatesHQ checked Sep 29, 202651-200543 contacts →

Partial evidence

“STS Technical Services is a Top 100 Staffing Firm that’s partnered with some of the largest names in the aerospace, manufacturing, defense and industrial industries.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidenceRochester, NY, United StatesHQ checked Sep 29, 20261,001-5,000542 contacts →

Indirect evidence

“Indotronix was founded in April, 1986 in Poughkeepsie, NY.”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 4,230 research and development staffing companies based in the United States

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Research and development staffing companies based in the United States at a glance

As of Sep 29, 2026
18.1%Verified-email coverage
26.7Average contacts per company
11-50Median size (employees)
3.2%Largest-city concentration · New York
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
1,868
11-50
1,296
51-200
697
201-500
222
501-1,000
74
1,001-5,000
53
5,001-10,000
8
10001+
9

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,230 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 research and development staffing companies, 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 the United States whose own description of what they do matches “research and development staffing companies”. 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 research and development staffing companies), 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 research and development staffing companies, and records with no verified work email. Companies headquartered outside United States 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, 20,509 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 29, 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

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 research and development staffing companies, 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 research and development staffing companies are there based in the United States?

RevenueBase identified 4,230 research and development staffing companies headquartered in the 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?

Beacon Hill, headquartered in Boston, tops this list with the largest team on record.

Which city has the most research and development staffing companies?

New York leads with 134 headquartered companies, followed by Houston (112) and Atlanta (84).

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 20,509 verified decision-maker contacts tracked across these 4,230 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 29, 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.