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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Express Employment Internationalexpresspros.com
International staffing company supporting franchise locations worldwide, providing staffing and HR services to connect individuals with jobs and businesses with employees |
14,211 | |||
| 2 |
H&Phelmerichpayne.com
Provider of advanced drilling technologies and solutions enhancing productivity, reliability, safety, and efficiency in land, international, and offshore operations. |
11,576 | |||
| 3 |
T.D. Williamsontdwilliamson.com
The company provides innovative solutions for pipeline operators worldwide to maximize uptime, improve throughput, minimize risk, and address regulatory climate challenges |
1,872 | |||
| 4 |
Zeeco, Inc.zeeco.com
A global leader in combustion and environmental solutions for various industries, specializing in ultra-low emission burners, flaring systems, and waste incineration |
1,812 | |||
| 5 |
NORDAMnordam.com
A global aerospace company specializing in designing, manufacturing, and maintaining propulsion systems, aircraft structures, and transparencies for business and military markets |
1,637 | |||
| 6 |
Continental Resourcesclr.com
Independent oil producer focused on exploration and production in major U.S. basins, driving American energy independence and market leadership. |
1,498 | |||
| 7 |
Cherokee Nation Businessescherokeenationbusinesses.com
An economic powerhouse owned by Cherokee Nation, focusing on innovation, diversification, job creation, and generating billions in annual revenue globally |
1,226 | |||
| 8 |
Manhattan Construction Companymanhattanconstructiongroup.com
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 |
1,108 | |||
| 9 |
Chickasaw Nation Industries, Inc.chickasaw.com
Operating subsidiaries for federal government and commercial clients, offering solutions in various sectors, supporting Chickasaw Nation economic development. |
1,095 | |||
| 10 |
Melton Truck Linesmeltontruck.com
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 |
951 | |||
| 11 |
John Zinkjohnzink.com
Global leader in environmental solutions for various industries, specializing in engineered vapor and combustion systems with Smart Combustionโข technology for optimized performance and efficiency |
869 | |||
| 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 | |||
| 13 |
Legalshield Independent Associatelegalshield.com
Legal protection and consultation services for personal legal matters, including family, financial, home, auto, IRS, and estate issues, offered at a low monthly fee |
789 | |||
| 14 |
ATCatcreman.com
A global leader in remanufacturing solutions for powertrain and drivetrain products for vehicles of all types, offering engineering services worldwide |
727 | |||
| 15 |
Matrix Servicematrixservicecompany.com
A provider of procurement, fabrication, and construction services for energy and industrial infrastructure, specializing in aboveground storage tanks and vessels |
603 | |||
| 16 |
Feed the Childrenfeedthechildren.org
A leading anti-hunger nonprofit organization dedicated to defeating childhood hunger by providing food, education, essentials, and clean water globally |
600 | |||
| 17 |
Delaware Resource Groupdrgok.com
Global aerospace defense contractor providing training systems integration, critical training, and logistics services worldwide for modern military programs and aircraft |
575 | |||
| 18 |
Kimray, Inckimray.com
A manufacturer based in Oklahoma City creating oil and gas control equipment since 1948 Specializing in temperature, level, flow, and pressure control solutions |
532 | |||
| 19 | 493 | ||||
| 20 |
The Bama Companies, Incbama.com
Supplier of hand-held pies, biscuits, buns, pie shells, and pizza crusts to major restaurant chains worldwide with custom oven-ready products. |
486 | |||
| 21 |
AMETEK MROametekmro.com
Global provider of third-party MRO services for commercial, regional, and general aviation Specializing in repair and overhaul services with various approvals |
481 | |||
| 22 |
YouVersionyouversion.com
Creating biblically-centered experiences through technology to help people seek intimacy with God daily, part of an innovative church ministry |
475 | |||
| 23 |
BS&B Safety Systemsbsbsystems.com
Global leader in non-reclosing pressure relief devices, setting industry standards with innovative products and services to protect personnel and equipment worldwide |
442 | |||
| 24 |
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 | |||
| 25 |
Avantive Solutionsavantivesolutions.com
Global contact center and BPO services specializing in customer engagement, strategic sales, and digital marketing across multiple international markets. |
428 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
capSpirecapspire.com
Experts in driving growth throughout the value chain through consulting, process implementation, operational support, and industry knowledge for strategic business advancement |
408 | |||
| 27 |
Jasco Productsbyjasco.com
Jasco designs and develops innovative home automation, lighting, security, entertainment, power, and mobility products for global distribution through major retailers and online platforms |
361 | |||
| 28 |
PCI Energy Solutionspcienergysolutions.com
A team of experts creates software solutions for power generation companies, optimizing efficiency, reducing costs, and promoting a cleaner energy future |
358 | |||
| 29 |
McElroy Manufacturing, Inc.mcelroy.com
Established in 1954, this company specializes in engineering and manufacturing fusion equipment for thermoplastic pipes, leading the industry with technological advancements |
335 | |||
| 30 |
MIRATECHmiratechcorp.com
Industry leader providing emission and acoustical solutions for engines, helping customers meet regulatory requirements while reducing emissions complexity Engineered for performance and quality |
325 | |||
| 31 |
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 | |||
| 32 |
InterWorksinterworks.com
A people-focused tech consultancy offering premier services in data management, visualization, server monitoring, and IT solutions tailored to unique client needs |
306 | |||
| 33 |
Reliance Oilfield Servicesrelianceofs.com
A company focused on extraordinary service, community impact, and employee support, prioritizing people over profits and creating a positive workplace culture |
302 | |||
| 34 |
Enovation Controlsenovationcontrols.com
Innovator of electronic controls and displays, providing customized solutions for engines, engine-driven equipment, and specialty vehicles across diverse markets globally. |
265 | |||
| 35 |
Accurus Aerospace Corporationaccurusaero.com
Leading Tier II supplier of machined parts, kits, assemblies, and processing services to global aerospace and defense industry Focused on high-value aircraft platforms |
245 | |||
| 36 |
Red Devil, Inc.reddevil.com
Manufacturing tools, chemical products and accessories for maintenance and improvement industry since 1872, with sales locations worldwide and headquarters in Tulsa, Oklahoma |
222 | |||
| 37 |
Fabricut, Incfabricut.com
A leading distributor of decorative products, offering fabrics, trimmings, wallcoverings, hardware, finished goods, and furniture with a focus on customer satisfaction and innovative designs |
205 | |||
| 38 |
Fox Rent A Carfoxrentacar.com
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 |
178 | |||
| 39 |
TTEC Holding Inc.ttecjobs.com
An American company based in Colorado that specializes in customer experience technology and services |
165 | |||
| 40 |
Da/Pro Rubber, Inc.daprorubber.com
Specializing in molding high-quality components since 1960, providing expert assistance in rubber, plastic, and TPE molding with ISO-certified facilities |
124 | |||
| 41 |
Capital Advisorscapitaladv.com
Wealth management firm founded in 1978 with over $45 Billion in assets under management, offering transparent investment processes and purposeful strategies |
85 | |||
| 42 |
Seal Companysealcompany.com
This company offers engineered sealing solutions globally, specializing in O-rings, seals, gaskets, and packings for various industries including defense, oilfield, and industrial sectors |
60 | |||
| 43 |
DMI International, LLC.dmiinternational.com
Manufacturer and supplier of construction and maintenance equipment for the pipeline industry, offering quality products, engineering expertise, and world class service globally |
53 | |||
| 44 |
Walvoil Fluid Power USAwalvoilusa.com
Global manufacturer of hydraulic valves, pumps, motors, and mechatronic systems for various industries, providing integrated hydraulic and electronic solutions for major OEMs worldwide |
43 | |||
| 45 |
CORKEN - an IDEX Energy businesscorken.com
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 |
39 | |||
| 46 |
VoiceFoundryttecdigital.com
Provider of AWS-powered digital transformation and consulting services, specializing in creating exceptional customer experiences and maximizing complex technology ecosystems |
26 | |||
| 47 |
Topeca Coffeetopecacoffee.com
Family-owned coffee company from El Salvador and Tulsa, OK, practicing a "Seed to Cup" philosophy, ensuring freshest coffee from farm to home |
25 | |||
| 48 |
TSI Flow Productstsiflowproducts.com
A leading provider of innovative flow control equipment, known for exceptional customer service, with locations across the US and Canada |
23 | |||
| 49 |
MICROFACTORY MANUFACTURINGmicrofactory.tech
A global engineering custom manufacturing parts company with a verified supplier network, offering end-to-end sourcing services with cost savings benefits |
8 | |||
| 50 |
Cognitionteamcognitionteam.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 |
7 | |||
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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 11, 2026.
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