39 leading professional services firms in Oklahoma (2026 list)

These professional services firms in Oklahoma include a mix of large enterprises and mid-sized companies, with a notable presence in staffing, IT services, and the oil and gas sector. Express Employment International, for example, is an international staffing company. Chickasaw Nation Industries, Inc. operates subsidiaries for government and commercial clients. Cypress Environmental Partners provides environmental services for energy and infrastructure, while DNI (Delaware Nation Industries) is a parent organization for IT businesses. Tulsa Inspection Resources, LLC offers inspection services for energy and civil industries.

A clear pattern among these companies is the strong concentration in the oil and gas industry, reflecting Oklahoma's economic landscape. Many of these firms, such as Tulsa Inspection Resources and Frontier Integrity Solutions, provide specialized inspection, integrity, and environmental services directly supporting the energy sector. Another observation is the prevalence of companies headquartered in Tulsa and Oklahoma City.

#	Company	Industry	Headquarters	Employees	Founded
1	Express Employment International expresspros.com International staffing company supporting franchise locations worldwide, providing staffing and HR services to connect individuals with jobs and businesses with employees	Staffing and Recruiting	🇺🇸 Oklahoma City	14,211	1983
2	Chickasaw Nation Industries, Inc.chickasaw.com Operating subsidiaries for federal government and commercial clients, offering solutions in various sectors, supporting Chickasaw Nation economic development.	Government Relations Services	🇺🇸 Norman	1,095	1996
3	Cypress Environmental Partners tirusa.com Nationally recognized environmental services company offering inspection, integrity, and water treatment solutions to support energy, water, and civil infrastructure sectors in the US	Oil and Gas	🇺🇸 Tulsa	963	2003
4	AHS Staffing ahsstaffing.com Connecting healthcare providers with top talent for employment opportunities with passion, loyalty, and integrity to benefit employees, clients, and community	Staffing and Recruiting	🇺🇸 Edmond	869	2008
5	Tulsa Inspection Resources, LLC tirusa.com This company offers inspection services, non-destructive examination, and pipeline integrity support to energy, civil, and municipal water industries in the US	Oil and Gas	🇺🇸 Tulsa	866	2003
6	DNI (Delaware Nation Industries)dnigov.com A parent organization for IT businesses owned by Delaware Nation, offering a suite of services and capabilities through strategic acquisitions and partnerships	IT Services and IT Consulting	🇺🇸 Oklahoma City	775	2015
7	GDH bit.ly Technology workforce solutions provider offering staffing, project solutions, and recruitment process outsourcing, dedicated to delivering top talent, support, and service	IT Services and IT Consulting	🇺🇸 Tulsa	742	2001
8	Quality Integrated Services, Inc. (QIS)qisinspection.com Industry leader in inspection and construction management services with over 25 years of experience, prioritizing safety, employee retention, and customer satisfaction	Oil and Gas	🇺🇸 Guymon	650	1991
9	HoganTaylor hogantaylor.com Professional business advisors offering comprehensive advisory, tax, accounting, assurance, human capital, and technology solutions with personal attention and commitment to success	Accounting	🇺🇸 Tulsa	411	n/a
10	capSpire capspire.com Experts in driving growth throughout the value chain through consulting, process implementation, operational support, and industry knowledge for strategic business advancement	IT Services and IT Consulting	🇺🇸 Tulsa	408	2009
11	McAfee & Taft mcafeetaft.com A leading Oklahoma-based law firm providing comprehensive legal solutions in various practice areas with a focus on creative strategies and client representation	Law Practice	🇺🇸 Oklahoma City	405	1952
12	Frontier Integrity Solutions frontierintegrity.com A strategic inspection provider offering progressive Inspector development, prioritizing retention and cost sensitivity, providing value-added services with integrity and commitment 24/7	Oil and Gas	🇺🇸 Tulsa	392	1975
13	CEC®connectcec.com The company is a privately-held engineering firm offering a wide range of services including transportation design, power delivery, construction management, and environmental services	Civil Engineering	🇺🇸 Oklahoma City	392	1966
14	Universal Field Services, Inc.ufsrw.com A leader in land acquisition services, offering negotiations, permitting, project management, and more with a focus on client success and quality processes	Real Estate	🇺🇸 Tulsa	361	1958
15	Express Personnel Services expresspros.com Connecting job seekers with top local employers, providing recruitment and hiring assistance for administrative, commercial, and professional roles across various industries and skill levels.	Human Resources Services	🇺🇸 Enid	328	n/a
16	Robinson Aviation (RVA), Inc.rvainc.com An aviation services company specializing in air traffic control operations, communications systems engineering, aviation safety studies, and transportation security planning	Airlines and Aviation	🇺🇸 Oklahoma City	327	1986
17	American Piping Inspection americanpipinginspection.com Established in 2006, this company offers NDE/NDT, Level III services, welder certification, 3rd party inspection, and construction services in multiple states	Oil and Gas	🇺🇸 Tulsa	325	2006
18	OakTree Staffing oaktreestaffing.com A company helping job seekers connect with top corporations and find success in diverse career opportunities for over 25 years	Staffing and Recruiting	🇺🇸 Tulsa	322	1995
19	Wallace Design Collective wallace.design A multidisciplinary design company offering civil and structural engineering, landscape architecture, land planning, and specialized inspections with a focus on improving lives	Design Services	🇺🇸 Tulsa	318	1981
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20	InterWorks interworks.com A people-focused tech consultancy offering premier services in data management, visualization, server monitoring, and IT solutions tailored to unique client needs	IT Services and IT Consulting	🇺🇸 Stillwater	306	1996
21	Inceed inceed.com A top-tier staffing company specializing in IT and Finance, dedicated to matching top talent with Fortune 500 companies and small businesses	Staffing and Recruiting	🇺🇸 Tulsa	185	2001
22	McDaniel Technical Services, Inc.mcdanieltsi.com The company provides construction management, third party inspection, project support, and staffing services for oil and natural gas pipelines and related facilities nationwide	Oil and Gas	🇺🇸 Broken Arrow	184	2000
23	Aviation Training Consulting atc-hq.com Aviation Training Consulting provides agile solutions for government and private-sector organizations, leveraging institutional expertise and industry experts for mission-critical operations	Defense and Space Manufacturing	🇺🇸 Altus	183	2001
24	Finley & Cook PLLC finley-cook.com A full-service accounting firm founded in 1947, providing nationwide customized accounting, audit, consulting, and tax services with over 75 years of experience and innovation	Accounting	🇺🇸 Shawnee	183	1947
25	Cyntergy_cyntergy.com A full service Architecture, Engineering, and Construction Administration firm with a focus on successful client relationships, communication, and creative design solutions	Architecture and Planning	🇺🇸 Tulsa	182	1997
26	KeyBridge Technologies, Inc keybridgeti.com Innovative business solutions provider optimizing assets, knowledge, and service with a dedicated staff and proven track record for customer satisfaction	IT Services and IT Consulting	🇺🇸 Oklahoma City	147	n/a
27	Novus Consulting novusconsulting.com Novus Consulting provides comprehensive strategies and transformation management for clients, addressing complex issues around people, process, technology, and data	IT Services and IT Consulting	🇺🇸 Oklahoma City	69	2020
28	Basin Engineering basinengineering.com Energy engineering and operations consulting firm specializing in drilling, completion, production operations, and petroleum engineering for oil and gas companies worldwide	Oil and Gas	🇺🇸 Oklahoma City	46	1995
29	GSB, Inc.gsb-inc.com A seasoned architecture firm with a national scope, specializing in sustainable design for various projects including resorts, education facilities, and residential developments	Architecture and Planning	🇺🇸 Oklahoma City	40	1979
30	Karsten Group karstenhrgroup.com Certified HR and payroll professionals offering a comprehensive solution for managing employees, bridging HR administration with business operations	Human Resources Services	🇺🇸 Oklahoma City	36	2017
31	McCoy & Orta, a Professional Corporation mccoy-orta.com Nationally-recognized law firm specializing in commercial loan originations, servicing, mortgage transfers, and representing private equity firms in the CMBS industry	Legal Services	🇺🇸 Oklahoma City	33	1992
32	VoiceFoundry ttecdigital.com Provider of AWS-powered digital transformation and consulting services, specializing in creating exceptional customer experiences and maximizing complex technology ecosystems	IT Services and IT Consulting	🇺🇸 Tulsa	26	n/a
33	Johnson & Jones, P.C.johnson-jones.com Established in 1994, the Firm offers expertise in business law, litigation, and estate planning, serving clients in various legal matters with community involvement	Law Practice	🇺🇸 Tulsa	12	1994
34	Psychology Specialists of Oklahoma, PLLC psychologyoklahoma.com A behavioral health group practice in Oklahoma City specializing in psychological and neuropsychological evaluations and assessments to meet community needs	Mental Health Care	🇺🇸 Oklahoma City	11	2006
35	Cognitionteam cognitionteam.com A professional services firm specializing in digital, cloud, and cyber security services, offering design and development of web and mobile applications, and enterprise-scale software solutions	IT Services and IT Consulting	🇺🇸 Oklahoma City	7	2018
36	Ball Morse Lowe PLLC bml.law Full-service law firm specializing in family law, oil and gas, real property, business transactions, commercial litigation, and probate and estate planning across multiple states	Legal Services	🇺🇸 Edmond	4	2008
37	Lone Cypress Energy Services, LLC.lonecypressenergyservices.com Independent energy company in Tulsa, OK specializing in traditional and renewable infrastructure development, EPC contracting, project management, and system operations for accessible and sustainable energy solutions	Oil and Gas	🇺🇸 Tulsa	4	2017
38	Lawless Consulting - Getting to Market faster!lawless-consulting.com Specializes in Knowledge Driven Product Development for medical devices, offering engineering resources and expertise to fast-track products from idea to commercialization	Business Consulting and Services	🇺🇸 Locust Grove	3	2011
39	ERP Associates erpassociates.com Specializing in transforming back-office systems, this company helps fortune 500 clients scale PMO and Architecture capabilities for business transformation and technology modernization projects Connect today	IT Services and IT Consulting	🇺🇸 Tulsa	2	2004

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

39 leading professional services firms in Oklahoma

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