Company lists · Data refreshed September 2026

Top 25 Research and development staffing companies based in Chicago, United States

Name: Research and development staffing companies based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 59 companies tracked

RevenueBase identified 59 research and development staffing companies headquartered in Chicago, United States as of September 2026 and tracks 4,754 professional contacts across them, including 1,237 with verified work emails. Across the United States, New York is the largest hub for this category (134 companies); Chicago has 59.

This list covers research and development staffing companies headquartered in Chicago, 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

59Companies

4,754Contacts tracked

1,237Verified emails

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The 25 largest research and development staffing companies based in Chicago, United States

Ranked by team size

Top 25 of 59 research and development staffing companies based in Chicago, 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Addison Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,840 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
2	MEDIX	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	501-1,000	1,753 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
3	Connect Search, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	51-200	310 contacts →
	Partial evidence “Connect Search, LLC is a boutique staffing firm founded by a group of partners who share the same vision and are all recruiters at heart.” Source: RevenueBase Database · checked Sep 29, 2026
4	Crystal Equation Corporation	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	201-500	262 contacts →
	Indirect evidence “Crystal Equation (CE) is a certified Women-Owned Business that empowers people and advances technology initiatives by building trust.” Source: RevenueBase Database · checked Sep 29, 2026
5	Hirewell	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	51-200	134 contacts →
	Indirect evidence “Hirewell is a global talent solutions provider that combines domain expert recruiters with modern hiring strategy to deliver people who make a difference.” Source: RevenueBase Database · checked Sep 29, 2026
6	Gforce Life Sciences	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	51-200	100 contacts →
	Indirect evidence “Multi-Year Award Winner Inc.” Source: RevenueBase Database · checked Sep 29, 2026
7	Platinum Recruiting	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	11-50	28 contacts →
	Indirect evidence “Finding professionals with experience in emerging technologies is never an easy task.” Source: RevenueBase Database · checked Sep 29, 2026
8	Peer Technical Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	51-200	21 contacts →
	Indirect evidence “Peer Technical is a Veteran-owned strategic search and recruitment firm specializing in engineering talent.” Source: RevenueBase Database · checked Sep 29, 2026
9	Compucore Solutions INC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	51-200	21 contacts →
	Partial evidence “CompuCore is a leading staffing, recruitment and consulting firm focused on Information Technological and Non Information Technological industries.” Source: RevenueBase Database · checked Sep 29, 2026
10	Cullerton Group	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	11-50	16 contacts →
	Partial evidence “Cullerton Group is a staffing firm specialized in the placement of IT and Engineering candidates.” Source: RevenueBase Database · checked Sep 29, 2026
11	Solve IT Strategies, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	13 contacts →
	Indirect evidence “Call us 312-870-0365!” Source: RevenueBase Database · checked Sep 29, 2026
12	Pinpoint Pharma, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	11-50	12 contacts →
	Indirect evidence “Pinpoint Pharma, LLC specializes in placing scientifically experienced candidates in positions within the pharmaceutical, medical device, chemical, and food industries.” Source: RevenueBase Database · checked Sep 29, 2026
13	Momentum Staffing Group	Strong evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	11-50	10 contacts →
	Strong evidence “Momentum Staffing Group is a boutique recruiting organization that partners with high-potential drug development companies and provides them with top talent from the scientific…” Source: RevenueBase Database · checked Sep 29, 2026
14	Paul Murphy Associates	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	9 contacts →
	Partial evidence “Paul Murphy Associates is a renowned supplier of comprehensive staffing solutions and recruitment services, catering to a diverse clientele both on a full-time and contractual…” Source: RevenueBase Database · checked Sep 29, 2026
15	Albany Staffing	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	201-500	8 contacts →
	Indirect evidence “Welcome to Albany Systems!” Source: RevenueBase Database · checked Sep 29, 2026
16	JY Careers	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	6 contacts →
	Indirect evidence “JY Careers specializes in the sourcing and permanent placement of long-term, professional individuals.” Source: RevenueBase Database · checked Sep 29, 2026
17	IIT Staffing.com	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	4 contacts →
	Partial evidence “At IIT Staffing, we specialize in connecting top talent with leading organizations across various industries.” Source: RevenueBase Database · checked Sep 29, 2026
18	Galvanized Search	Partial evidence	Chicago, United StatesHQ checked Sep 29, 2026	1-10	3 contacts →
	Partial evidence “The Leader in Life Science, Private Equity and Venture Capital Staffing.” Source: RevenueBase Database · checked Sep 29, 2026
19	Serac Solutions LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	11-50	1 contacts →
	Partial evidence “Accounting Staffing, Finance Staffing, Technology Staffing, Administrative Staffing, Light Industrial Staffing & More.” Source: RevenueBase Database · checked Sep 29, 2026
20	Technical People	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Partial evidence “Technical People® is a staffing company and our mission has been to offer the most specialized and comprehensive technical staffing solutions available anywhere.” Source: RevenueBase Database · checked Sep 29, 2026
21	Aeconnection, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “AEConnection is a direct-placement recruiting firm serving Architecture, Engineering, and Construction firms across the United States.” Source: RevenueBase Database · checked Sep 29, 2026
22	Tekline Recruiting INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “Founded in 2001, TekLine Recruiting brings over 18 years of experience as Chicago Engineering recruiters, filling engineering roles for local manufacturers.” Source: RevenueBase Database · checked Sep 29, 2026
23	Recruiting Talent	Indirect evidence	Chicago, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “Recruiting Talent has extensive experience in sourcing the ideal candidate for your company.” Source: RevenueBase Database · checked Sep 29, 2026
24	VC Resources, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Partial evidence “Dedicated staffing professionals with a focus/background in Accounting, Finance, Administrative, Marketing, Construction and Sales roles.” Source: RevenueBase Database · checked Sep 29, 2026
25	Fractl Consulting	Indirect evidence	Chicago, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “Fractl is all about serving the needs of our clients and our talent.” Source: RevenueBase Database · checked Sep 29, 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: research and development staffing companies. 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 research and development staffing companies.
Partial evidence: Its own public description names part of research and development staffing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name research and development staffing companies. 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 59 research and development staffing companies based in Chicago, United States

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

As of Sep 29, 2026

26.0%Verified-email coverage

80.6Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 59 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 Chicago, 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 Chicago 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, 1,237 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.

Research and development staffing companies 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 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 Chicago, United States?

RevenueBase identified 59 research and development staffing companies headquartered in Chicago, 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?

Addison Group, headquartered in Chicago, tops this list with the largest team on record.

Which city in the United States has the most research and development staffing companies?

New York leads the United States with 134 headquartered companies, followed by Houston (112) and Atlanta (84). Chicago has 59.

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 1,237 verified decision-maker contacts tracked across these 59 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.