This list features publicly traded companies based in Oklahoma, predominantly large and mid-sized firms. The oil and gas sector is strongly represented, with companies like H&P, a provider of advanced drilling technologies, and Williams, which offers transport and storage solutions for clean energy. ONEOK is a midstream operator for natural gas and NGLs, while Chesapeake Energy focuses on developing US oil and gas plays. Other sectors include software development with Paycom, utilities with ONE Gas and OGE Energy Corp., and financial services with Bank of Oklahoma and BancFirst. A notable pattern is the concentration of headquarters in Tulsa and Oklahoma City, with Tulsa having a slight majority of the companies listed.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
H&Phelmerichpayne.com
Provider of advanced drilling technologies and solutions enhancing productivity, reliability, safety, and efficiency in land, international, and offshore operations. |
11,576 | |||
| 2 |
Williamswilliams.com
Provides transport, storage, and delivery solutions for clean energy, operating critical infrastructure to support a low-carbon energy future. |
6,995 | |||
| 3 | 6,516 | ||||
| 4 |
Paycompaycom.com
A payroll and HR software company simplifying employee life and transforming business processes with innovative technology and award-winning team |
5,731 | |||
| 5 |
Chesapeake Energychk.com
An Oklahoma City-based oil and gas company focused on responsibly developing leading positions in top US plays and aiming for net zero GHG emissions by 2035 |
2,567 | |||
| 6 |
ONE Gasjobs.onegas.com
A natural gas distribution company serving over 22 million customers in Kansas, Oklahoma, and Texas, with a focus on creating a respectful online community |
2,413 | |||
| 7 |
Bank of Oklahomabankofoklahoma.com
A community-focused bank with the resources of a regional leader, offering commercial and consumer banking, investment services, and mortgage origination |
2,241 | |||
| 8 |
OGE Energy Corp.oge.com
Serving over 910,000 customers in Oklahoma and Arkansas, providing energy with focus on safety, innovation, and community improvement. |
1,892 | |||
| 9 |
AAON, Inc.aaon.com
Innovative company advancing the HVAC industry with customizable solutions for commercial and industrial spaces, focusing on design, manufacturing, and testing |
1,654 | |||
| 10 |
BancFirstbancfirst.bank
A $12 billion assets company with over 100 locations in 60 Oklahoma communities, offering a range of personal and commercial financial products and services |
1,581 | |||
| 11 |
SandRidge Energysandridgeenergy.com
An oil and natural gas exploration and production entity focusing on high-return projects in the US Mid-Continent and Niobrara Shale regions |
819 | |||
| 12 |
Matrix Service Companymatrixservicecompany.com
A leading industrial engineering, construction, and maintenance contractor focused on sustainability and strong ESG practices, with global offices and recognitions |
809 | |||
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| 13 |
Magellan Midstream Partnersmagellanlp.com
A publicly traded partnership transporting, storing, and distributing refined petroleum products and crude oil with a focus on safety, efficiency, and responsibility |
799 | |||
| 14 |
Cedar Creekbluelinxco.com
Established in 1977, this company is a leading wholesaler of lumber and building materials, prioritizing customer care, quality products, knowledgeable staff, and efficient delivery services |
642 | |||
| 15 |
NGL Energy Partners LPnglenergypartners.com
A vertically integrated MLP in the midstream energy sector, providing transportation, storage, blending, and marketing services for crude oil, NGLs, refined products, and water solutions |
627 | |||
| 16 |
Unit Corporationunitcorp.com
Diversified energy company involved in oil and gas exploration, production, property acquisition, and onshore drilling in the Mid-Continent region Headquarters in Tulsa, OK |
451 | |||
| 17 |
Page Not Active - H&P Technologieshpinc.com
A division of H&P, find us on LinkedIn under the handle @Helmerich-Payne for more information |
431 | |||
| 18 |
Educational Development Corporation / PaperPie
A publishing company specializing in children's books, with over 2,000 titles, sold nationally through direct sales consultants and in stores |
383 | |||
| 19 |
LSB Industries, Inc.lsbindustries.com
LSB Industries produces low and no carbon products for industries like agriculture, industrial, mining, and energy markets, focusing on excellence and customer experience |
354 | |||
| 20 |
Matrix NACmatrixservicecompany.com
A subsidiary providing procurement, construction, maintenance, and repair services to North American energy and industrial markets with a focus on sustainability and ESG practices |
310 | |||
| 21 |
Gulfport Energy Corporationgulfportenergy.com
An independent exploration and production company focused on natural gas in the Appalachia and Anadarko basins, with a strategy for sustainable value creation |
297 | |||
| 22 |
MACH Resourcesmachresources.com
MACH Resources is a growth-oriented company acquiring and maximizing responsible development of oil and gas assets in America's top producing basins |
187 | |||
| 23 |
Parks Jones Realtymypeggyfosterhomes.com
A well-established real estate company offering a range of services including property sales, rentals, market analysis, and national relocation assistance since 1966 |
37 | |||
| 24 |
ClearSign Technologiesclearsign.com
Innovative technology company solving energy industry challenges with cost-effective, retrofit solutions for superior emissions control and improved combustion performance |
23 | |||
| 25 |
GO Consulting Servicesgoconsultingservices.com
A full-service MSP specializing in network installation, support, and maintenance, leveraging partnerships to help businesses move forward with personalized solutions |
15 | |||
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How this list is built
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 12, 2026.
More company lists in Oklahoma
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- Oil and Gas companies in Oklahoma 112
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- Critical infrastructure operators in Oklahoma 86
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The same list elsewhere in United States
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