# 50 leading multinational companies in Oklahoma

Tamtam tracks 51 multinational companies headquartered in Oklahoma. This list ranks the 50 largest by number of employees on LinkedIn, led by Express Employment International, H&P and T.D. Williamson. Their median headcount is 428. Half of them were founded in 1979 or later. The most common headquarters are Tulsa (32) and Oklahoma City (12).

This selection of multinational companies in Oklahoma includes several large, established firms, particularly in the oil and gas sector. Key players like H&P and T.D. Williamson, both founded in 1920 and headquartered in Tulsa, specialize in advanced drilling technologies and pipeline solutions. Zeeco, Inc., also based in Tulsa, is a global leader in combustion and environmental solutions. Beyond energy, Express Employment International, an Oklahoma City-based staffing company founded in 1983, stands out with over 14,000 employees.

A clear pattern is the dominance of Tulsa as a headquarters city for these multinational operations, especially within the oil and gas industry. Companies like NORDAM, an aerospace firm, and Manhattan Construction Company, a long-standing construction business, further contribute to Tulsa's industrial concentration. Oklahoma City also features prominently with companies such as Continental Resources, an independent oil producer, and ATC, a global leader in vehicle parts remanufacturing.

🇺🇸 Oklahoma · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Express Employment International](https://www.tamtam.ai/c/express-employment-international) (expresspros.com)<br>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 | [H&P](https://www.tamtam.ai/c/h-and-p) (helmerichpayne.com)<br>Provider of advanced drilling technologies and solutions enhancing productivity, reliability, safety, and efficiency in land, international, and offshore operations. | Oil and Gas | 🇺🇸 Tulsa | 11,576 | 1920 |
| 3 | [T.D. Williamson](https://www.tamtam.ai/c/t-d-williamson) (tdwilliamson.com)<br>The company provides innovative solutions for pipeline operators worldwide to maximize uptime, improve throughput, minimize risk, and address regulatory climate challenges | Oil and Gas | 🇺🇸 Tulsa | 1,872 | 1920 |
| 4 | [Zeeco, Inc.](https://www.tamtam.ai/c/zeeco-inc) (zeeco.com)<br>A global leader in combustion and environmental solutions for various industries, specializing in ultra-low emission burners, flaring systems, and waste incineration | Oil and Gas | 🇺🇸 Tulsa | 1,812 | 1979 |
| 5 | [NORDAM](https://www.tamtam.ai/c/nordam) (nordam.com)<br>A global aerospace company specializing in designing, manufacturing, and maintaining propulsion systems, aircraft structures, and transparencies for business and military markets | Aviation and Aerospace Component Manufacturing | 🇺🇸 Tulsa | 1,637 | 1969 |
| 6 | [Continental Resources](https://www.tamtam.ai/c/continental-resources) (clr.com)<br>Independent oil producer focused on exploration and production in major U.S. basins, driving American energy independence and market leadership. | Oil and Gas | 🇺🇸 Oklahoma City | 1,498 | 1967 |
| 7 | [Cherokee Nation Businesses](https://www.tamtam.ai/c/cherokee-nation-businesses) (cherokeenationbusinesses.com)<br>An economic powerhouse owned by Cherokee Nation, focusing on innovation, diversification, job creation, and generating billions in annual revenue globally | Information Services | 🇺🇸 Tulsa | 1,226 | 2004 |
| 8 | [Manhattan Construction Company](https://www.tamtam.ai/c/manhattan-construction-company) (manhattanconstructiongroup.com)<br>Family-owned construction company since 1896, specializing in building facilities across the US, Mexico, Central America, and the Caribbean, with a focus on trust and long-term relationships | Construction | 🇺🇸 Tulsa | 1,108 | 1896 |
| 9 | [Chickasaw Nation Industries, Inc.](https://www.tamtam.ai/c/chickasaw-nation-industries-inc) (chickasaw.com)<br>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 |
| 10 | [Melton Truck Lines](https://www.tamtam.ai/c/melton-truck-lines) (meltontruck.com)<br>Leading flatbed trucking company providing on-time transportation service across North America, specializing in Mexico with a 98% on-time record and strong focus on safety and driver training | Truck Transportation | 🇺🇸 Tulsa | 951 | 1954 |
| 11 | [John Zink](https://www.tamtam.ai/c/john-zink) (johnzink.com)<br>Global leader in environmental solutions for various industries, specializing in engineered vapor and combustion systems with Smart Combustion™ technology for optimized performance and efficiency | Oil and Gas | 🇺🇸 Tulsa | 869 |  |
| 12 | [Matrix Service Company](https://www.tamtam.ai/c/matrix-service-company) (matrixservicecompany.com)<br>A leading industrial engineering, construction, and maintenance contractor focused on sustainability and strong ESG practices, with global offices and recognitions | Construction | 🇺🇸 Tulsa | 809 | 1984 |
| 13 | [Legalshield Independent Associate](https://www.tamtam.ai/c/legalshield-independent-associate) (legalshield.com)<br>Legal protection and consultation services for personal legal matters, including family, financial, home, auto, IRS, and estate issues, offered at a low monthly fee | Legal Services | 🇺🇸 Ada | 789 |  |
| 14 | [ATC](https://www.tamtam.ai/c/atc-oklahoma-city) (atcreman.com)<br>A global leader in remanufacturing solutions for powertrain and drivetrain products for vehicles of all types, offering engineering services worldwide | Motor Vehicle Parts Manufacturing | 🇺🇸 Oklahoma City | 727 |  |
| 15 | [Matrix Service](https://www.tamtam.ai/c/matrix-service) (matrixservicecompany.com)<br>A provider of procurement, fabrication, and construction services for energy and industrial infrastructure, specializing in aboveground storage tanks and vessels | Construction | 🇺🇸 Tulsa | 603 | 1984 |
| 16 | [Feed the Children](https://www.tamtam.ai/c/feed-the-children) (feedthechildren.org)<br>A leading anti-hunger nonprofit organization dedicated to defeating childhood hunger by providing food, education, essentials, and clean water globally | Non-profit Organizations | 🇺🇸 Oklahoma City | 600 | 1979 |
| 17 | [Delaware Resource Group](https://www.tamtam.ai/c/delaware-resource-group) (drgok.com)<br>Global aerospace defense contractor providing training systems integration, critical training, and logistics services worldwide for modern military programs and aircraft | Defense and Space Manufacturing | 🇺🇸 Oklahoma City | 575 | 2002 |
| 18 | [Kimray, Inc](https://www.tamtam.ai/c/kimray-inc) (kimray.com)<br>A manufacturer based in Oklahoma City creating oil and gas control equipment since 1948 Specializing in temperature, level, flow, and pressure control solutions | Oil and Gas | 🇺🇸 Oklahoma City | 532 | 1948 |
| 19 | [AAPG](https://www.tamtam.ai/c/aapg) (aapg.org)<br>A global association for petroleum geologists, providing publications, conferences, and educational opportunities for professionals in the upstream energy industry worldwide | Non-profit Organizations | 🇺🇸 Tulsa | 493 | 1917 |
| 20 | [The Bama Companies, Inc](https://www.tamtam.ai/c/the-bama-companies-inc) (bama.com)<br>Supplier of hand-held pies, biscuits, buns, pie shells, and pizza crusts to major restaurant chains worldwide with custom oven-ready products. | Food and Beverage Services | 🇺🇸 Tulsa | 486 | 1925 |
| 21 | [AMETEK MRO](https://www.tamtam.ai/c/ametek-mro) (ametekmro.com)<br>Global provider of third-party MRO services for commercial, regional, and general aviation Specializing in repair and overhaul services with various approvals | Aviation and Aerospace Component Manufacturing | 🇺🇸 Tulsa | 481 |  |
| 22 | [YouVersion](https://www.tamtam.ai/c/youversion) (youversion.com)<br>Creating biblically-centered experiences through technology to help people seek intimacy with God daily, part of an innovative church ministry | Religious Institutions | 🇺🇸 Edmond | 475 | 2007 |
| 23 | [BS&B Safety Systems](https://www.tamtam.ai/c/bs-and-b-safety-systems) (bsbsystems.com)<br>Global leader in non-reclosing pressure relief devices, setting industry standards with innovative products and services to protect personnel and equipment worldwide | Industrial Machinery Manufacturing | 🇺🇸 Tulsa | 442 |  |
| 24 | [Page Not Active - H&P Technologies](https://www.tamtam.ai/c/page-not-active-h-and-p-technologies) (hpinc.com)<br>A division of H&P, find us on LinkedIn under the handle @Helmerich-Payne for more information | Oil and Gas | 🇺🇸 Tulsa | 431 |  |
| 25 | [Avantive Solutions](https://www.tamtam.ai/c/avantive-solutions) (avantivesolutions.com)<br>Global contact center and BPO services specializing in customer engagement, strategic sales, and digital marketing across multiple international markets. | Outsourcing and Offshoring Consulting | 🇺🇸 Tulsa | 428 | 1988 |
| 26 | [capSpire](https://www.tamtam.ai/c/capspire) (capspire.com)<br>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 |
| 27 | [Jasco Products](https://www.tamtam.ai/c/jasco-products) (byjasco.com)<br>Jasco designs and develops innovative home automation, lighting, security, entertainment, power, and mobility products for global distribution through major retailers and online platforms | Computers and Electronics Manufacturing | 🇺🇸 Oklahoma City | 361 | 1975 |
| 28 | [PCI Energy Solutions](https://www.tamtam.ai/c/pci-energy-solutions) (pcienergysolutions.com)<br>A team of experts creates software solutions for power generation companies, optimizing efficiency, reducing costs, and promoting a cleaner energy future | Software Development | 🇺🇸 Norman | 358 | 1992 |
| 29 | [McElroy Manufacturing, Inc.](https://www.tamtam.ai/c/mcelroy-manufacturing-inc) (mcelroy.com)<br>Established in 1954, this company specializes in engineering and manufacturing fusion equipment for thermoplastic pipes, leading the industry with technological advancements | Machinery Manufacturing | 🇺🇸 Tulsa | 335 | 1954 |
| 30 | [MIRATECH](https://www.tamtam.ai/c/miratech) (miratechcorp.com)<br>Industry leader providing emission and acoustical solutions for engines, helping customers meet regulatory requirements while reducing emissions complexity Engineered for performance and quality | Environmental Services | 🇺🇸 Tulsa | 325 | 1992 |
| 31 | [Matrix NAC](https://www.tamtam.ai/c/matrix-nac) (matrixservicecompany.com)<br>A subsidiary providing procurement, construction, maintenance, and repair services to North American energy and industrial markets with a focus on sustainability and ESG practices | Construction | 🇺🇸 Tulsa | 310 |  |
| 32 | [InterWorks](https://www.tamtam.ai/c/interworks) (interworks.com)<br>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 |
| 33 | [Reliance Oilfield Services](https://www.tamtam.ai/c/reliance-oilfield-services) (relianceofs.com)<br>A company focused on extraordinary service, community impact, and employee support, prioritizing people over profits and creating a positive workplace culture | Oil and Gas | 🇺🇸 Tulsa | 302 | 2004 |
| 34 | [Enovation Controls](https://www.tamtam.ai/c/enovation-controls) (enovationcontrols.com)<br>Innovator of electronic controls and displays, providing customized solutions for engines, engine-driven equipment, and specialty vehicles across diverse markets globally. | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Tulsa | 265 | 1939 |
| 35 | [Accurus Aerospace Corporation](https://www.tamtam.ai/c/accurus-aerospace-corporation) (accurusaero.com)<br>Leading Tier II supplier of machined parts, kits, assemblies, and processing services to global aerospace and defense industry Focused on high-value aircraft platforms | Aviation and Aerospace Component Manufacturing | 🇺🇸 Tulsa | 245 | 2013 |
| 36 | [Red Devil, Inc.](https://www.tamtam.ai/c/red-devil-inc) (reddevil.com)<br>Manufacturing tools, chemical products and accessories for maintenance and improvement industry since 1872, with sales locations worldwide and headquarters in Tulsa, Oklahoma | Chemical Manufacturing | 🇺🇸 Tulsa | 222 | 1872 |
| 37 | [Fabricut, Inc](https://www.tamtam.ai/c/fabricut-inc) (fabricut.com)<br>A leading distributor of decorative products, offering fabrics, trimmings, wallcoverings, hardware, finished goods, and furniture with a focus on customer satisfaction and innovative designs | Wholesale | 🇺🇸 Tulsa | 205 | 1954 |
| 38 | [Fox Rent A Car](https://www.tamtam.ai/c/fox-rent-a-car-tulsa) (foxrentacar.com)<br>A global provider of low-cost leisure car rental services with locations in the US, Canada, Mexico, Europe, and the Middle East, offering a diverse fleet and dedicated customer service | Travel Arrangements | 🇺🇸 Tulsa | 178 | 1989 |
| 39 | [TTEC Holding Inc.](https://www.tamtam.ai/c/ttec-holding-inc) (ttecjobs.com)<br>An American company based in Colorado that specializes in customer experience technology and services | Consumer Services | 🇺🇸 Oklahoma City | 165 | 2015 |
| 40 | [Da/Pro Rubber, Inc.](https://www.tamtam.ai/c/da-pro-rubber-inc) (daprorubber.com)<br>Specializing in molding high-quality components since 1960, providing expert assistance in rubber, plastic, and TPE molding with ISO-certified facilities | Plastics and Rubber Product Manufacturing | 🇺🇸 Broken Arrow | 124 | 1961 |
| 41 | [Capital Advisors](https://www.tamtam.ai/c/capital-advisors) (capitaladv.com)<br>Wealth management firm founded in 1978 with over $45 Billion in assets under management, offering transparent investment processes and purposeful strategies | Financial Services | 🇺🇸 Tulsa | 85 | 1978 |
| 42 | [Seal Company](https://www.tamtam.ai/c/seal-company) (sealcompany.com)<br>This company offers engineered sealing solutions globally, specializing in O-rings, seals, gaskets, and packings for various industries including defense, oilfield, and industrial sectors | Industrial Machinery Manufacturing | 🇺🇸 Tulsa | 60 | 1971 |
| 43 | [DMI International, LLC.](https://www.tamtam.ai/c/dmi-international-llc) (dmiinternational.com)<br>Manufacturer and supplier of construction and maintenance equipment for the pipeline industry, offering quality products, engineering expertise, and world class service globally | Oil and Gas | 🇺🇸 Tulsa | 53 | 1977 |
| 44 | [Walvoil Fluid Power USA](https://www.tamtam.ai/c/walvoil-fluid-power-usa) (walvoilusa.com)<br>Global manufacturer of hydraulic valves, pumps, motors, and mechatronic systems for various industries, providing integrated hydraulic and electronic solutions for major OEMs worldwide | Industrial Machinery Manufacturing | 🇺🇸 Tulsa | 43 | 1969 |
| 45 | [CORKEN - an IDEX Energy business](https://www.tamtam.ai/c/corken-an-idex-energy-business) (corken.com)<br>Global leader in industrial compressors, pumps, and accessories for liquefied gas transfer, air boosting, vapor recovery, with a strong commitment to customer service and innovation | Oil and Gas | 🇺🇸 Oklahoma City | 39 |  |
| 46 | [VoiceFoundry](https://www.tamtam.ai/c/voicefoundry) (ttecdigital.com)<br>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 |  |
| 47 | [Topeca Coffee](https://www.tamtam.ai/c/topeca-coffee) (topecacoffee.com)<br>Family-owned coffee company from El Salvador and Tulsa, OK, practicing a "Seed to Cup" philosophy, ensuring freshest coffee from farm to home | Food and Beverage Services | 🇺🇸 Tulsa | 25 | 2002 |
| 48 | [TSI Flow Products](https://www.tamtam.ai/c/tsi-flow-products) (tsiflowproducts.com)<br>A leading provider of innovative flow control equipment, known for exceptional customer service, with locations across the US and Canada | Oil and Gas | 🇺🇸 Oklahoma City | 23 |  |
| 49 | [MICROFACTORY MANUFACTURING](https://www.tamtam.ai/c/microfactory-manufacturing) (microfactory.tech)<br>A global engineering custom manufacturing parts company with a verified supplier network, offering end-to-end sourcing services with cost savings benefits | Manufacturing | 🇺🇸 Oklahoma City | 8 | 2021 |
| 50 | [Cognitionteam](https://www.tamtam.ai/c/cognitionteam) (cognitionteam.com)<br>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 |

## 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 11, 2026.

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## The same list elsewhere in United States

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Source: https://www.tamtam.ai/l/multinational-companies-oklahoma