# List of companies with in-house R&D in Oklahoma

Tamtam tracks 40 companies with in-house R&D headquartered in Oklahoma. This list ranks the 39 largest by number of employees on LinkedIn, led by Oklahoma State University, University of Oklahoma and H&P. Their median headcount is 465. Half of them were founded in 1977 or later. The most common headquarters are Tulsa (17) and Oklahoma City (11).

These Oklahoma companies with in-house R&D are primarily large organizations, with a strong presence in higher education and the oil and gas sector. Oklahoma State University and the University of Oklahoma, both established in 1890, are significant employers, alongside H&P, a provider of advanced drilling technologies, and Paycom, a payroll and HR software company. Other notable firms include T.D. Williamson, which offers solutions for pipeline operators, and Zeeco, Inc., a leader in combustion and environmental solutions.

A clear pattern among these companies is the prevalence of the oil and gas industry, particularly in Tulsa, which is home to H&P, T.D. Williamson, Zeeco, and John Zink. Additionally, the presence of major universities like Oklahoma State University and the University of Oklahoma highlights a strong foundation in research and development within the state.

🇺🇸 Oklahoma · 39 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Oklahoma State University](https://www.tamtam.ai/c/oklahoma-state-university) (go.okstate.edu)<br>Delivering education, research, and community engagement in alignment with a land-grant mission for over a century | Higher Education | 🇺🇸 Stillwater | 13,451 | 1890 |
| 2 | [University of Oklahoma](https://www.tamtam.ai/c/university-of-oklahoma) (ou.edu)<br>A top public university attracting students nationally and internationally, offering a private college atmosphere, academic excellence, and a wide range of fields of study | Higher Education | 🇺🇸 Norman | 11,872 | 1890 |
| 3 | [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 |
| 4 | [Paycom](https://www.tamtam.ai/c/paycom) (paycom.com)<br>A payroll and HR software company simplifying employee life and transforming business processes with innovative technology and award-winning team | Software Development | 🇺🇸 Oklahoma City | 5,731 | 1998 |
| 5 | [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 |
| 6 | [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 |
| 7 | [AAON, Inc.](https://www.tamtam.ai/c/aaon-inc) (aaon.com)<br>Innovative company advancing the HVAC industry with customizable solutions for commercial and industrial spaces, focusing on design, manufacturing, and testing | Machinery Manufacturing | 🇺🇸 Tulsa | 1,654 | 1988 |
| 8 | [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 |
| 9 | [Oklahoma Heart Hospital](https://www.tamtam.ai/c/oklahoma-heart-hospital) (okheart.com)<br>A physician-owned hospital in Oklahoma, designed by cardiologists to provide expert, individualized care with utmost comfort in a digital environment | Hospitals and Health Care | 🇺🇸 Oklahoma City | 1,354 | 2002 |
| 10 | [Nortek Air Solutions, LLC](https://www.tamtam.ai/c/nortek-air-solutions-llc) (nortekair.com)<br>Leading HVAC manufacturer in North America providing custom solutions for industrial air handling, cleanroom systems, and mission critical technology with extensive experience and facilities | Machinery Manufacturing | 🇺🇸 Okarche | 1,305 | 1977 |
| 11 | [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 |
| 12 | [Oklahoma Children's Hospital OU Health](https://www.tamtam.ai/c/oklahoma-children-s-hospital-ou-health) (ouhealth.com)<br>Innovative children's healthcare provider at OU Health, providing advanced research and treatments through hospital and outpatient services | Hospitals and Health Care | 🇺🇸 Oklahoma City | 999 |  |
| 13 | [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 |  |
| 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 | [Webco Industries](https://www.tamtam.ai/c/webco-industries) (webcotube.com)<br>A leading manufacturer and distributor of steel tubing, founded in 1969, with locations in Oklahoma, Texas, and Pennsylvania Specializing in various types of steel tubing | Oil, Gas, and Mining | 🇺🇸 Sand Springs | 699 | 1969 |
| 16 | [Thru Tubing Solutions](https://www.tamtam.ai/c/thru-tubing-solutions) (thrutubing.com)<br>Specializing in downhole operations, we offer specialized equipment and services for optimal results in shale regions worldwide, available 24/7 | Oil and Gas | 🇺🇸 Newcastle | 549 | 1997 |
| 17 | [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 |
| 18 | [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 |
| 19 | [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 |  |
| 20 | [OU Health Stephenson Cancer Center](https://www.tamtam.ai/c/ou-health-stephenson-cancer-center) (ouhealth.com)<br>A nationally recognized academic cancer center in Oklahoma conducting innovative research and providing top-notch patient care in collaboration with leading organizations | Hospitals and Health Care | 🇺🇸 Oklahoma City | 465 | 2011 |
| 21 | [Summit ESP](https://www.tamtam.ai/c/summit-esp) (summitesp.com)<br>A service provider offering integrated Electric Submersible Pumping systems to optimize production, reduce costs, and increase profitability in the artificial lift industry | Oil and Gas | 🇺🇸 Tulsa | 448 | 2012 |
| 22 | [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 |  |
| 23 | [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 |  |
| 24 | [OU Health Campus Graduate College](https://www.tamtam.ai/c/ou-health-campus-graduate-college) (graduate.ouhsc.edu)<br>Networking platform for currently enrolled students and alumni of The University of Oklahoma Health Sciences Center Graduate College to connect and stay updated on activities | Higher Education | 🇺🇸 Oklahoma City | 361 |  |
| 25 | [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 |
| 26 | [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 |
| 27 | [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 |
| 28 | [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 |
| 29 | [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 |
| 30 | [Noble Research Institute](https://www.tamtam.ai/c/noble-research-institute) (noble.org)<br>A company dedicated to promoting regenerative ranching principles to transform grazing lands and benefit the environment while supporting producers' bottom line | Non-profit Organizations | 🇺🇸 Ardmore | 262 | 1945 |
| 31 | [Wolverine Tube, Inc.](https://www.tamtam.ai/c/wolverine-tube-inc) (wlv.com)<br>A global leader in innovative heat transfer solutions, specializing in thermal management products for various industries worldwide with a focus on energy efficiency and tailored customer solutions | Mining | 🇺🇸 Shawnee | 187 | 1916 |
| 32 | [Mercer Valve Co., Inc.](https://www.tamtam.ai/c/mercer-valve-co-inc) (mercervalve.net)<br>A company focused on delivering high-quality pressure relief valves with patented technology, competitive pricing, timely delivery, and professional services | Oil and Gas | 🇺🇸 Oklahoma City | 186 | 1985 |
| 33 | [Field Aerospace](https://www.tamtam.ai/c/field-aerospace) (fieldaero.com)<br>Field Aerospace in Oklahoma City offers aircraft modifications, maintenance, project management, and integration services for special mission aircraft and avionics systems | Aviation and Aerospace Component Manufacturing | 🇺🇸 Oklahoma City | 143 | 2015 |
| 34 | [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 |
| 35 | [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 |
| 36 | [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 |
| 37 | [SISU Energy and Environmental](https://www.tamtam.ai/c/sisu-energy-and-environmental) (sisu-ee.com)<br>A solutions-driven partner specializing in emissions reduction, retrofit optimization, field service, waste heat recovery, renewables, and distributed energy for sustainable projects | Energy Technology | 🇺🇸 Tulsa | 35 | 2015 |
| 38 | [CMI ROADBUILDING INC.](https://www.tamtam.ai/c/cmi-roadbuilding-inc) (cmi-roadbuilding.com)<br>A heavy equipment manufacturing company specializing in road building, construction, and waste management Offers products for compaction, paving, and recycling | Machinery Manufacturing | 🇺🇸 Oklahoma City | 33 |  |
| 39 | [Ascend Beyond Space](https://www.tamtam.ai/c/ascend-beyond-space) (ascendbeyond.space)<br>Democratizing end-of-life management and disposal of satellites with a complete and accessible ecosystem for sustainable space debris solutions. | Defense and Space Manufacturing | 🇺🇸 Annecy | 4 |  |

## 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/r-and-d-companies-oklahoma