This selection of companies with in-house R&D in Houston consists primarily of large enterprises in the energy sector, alongside significant players in healthcare and technology. Companies like Halliburton and Chevron focus on oil and gas, while Hewlett Packard Enterprise is a global edge-to-cloud technology firm. The list also includes major healthcare institutions such as UT MD Anderson, a cancer center, and Houston Methodist, a comprehensive health system.
A notable pattern among these companies is the strong presence of the oil and gas industry, with many firms like Baker Hughes, SLB, and Oceaneering providing specialized services and technologies for energy exploration and production. This concentration highlights Houston's role as a global hub for energy technology and innovation.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Hewlett Packard Enterprisehpe.com
This company is a global edge-to-cloud company that drives technology and innovation to fulfill its passion and purpose |
90,021 | |||
| 2 | 79,707 | ||||
| 3 |
Baker Hughesbakerhughes.com
Energy technology company providing innovative solutions globally, focusing on safety, efficiency, and sustainability in the energy and industrial sectors |
67,440 | |||
| 4 |
Halliburtonhalliburton.com
Collaborates to engineer solutions maximizing energy asset value, from locating hydrocarbons, managing data, drilling, evaluating, and constructing wells, to optimizing production. |
60,277 | |||
| 5 |
Chevronchevron.com
The company values its people and their innovation in tackling energy challenges, fostering open and respectful communication on LinkedIn |
55,495 | |||
| 6 |
UT MD Andersonmdanderson.org
A leading cancer center focused on patient care, research, education, and prevention, with top rankings in cancer care and a mission to #EndCancer |
23,100 | |||
| 7 |
Houston Methodisthoustonmethodist.org
Comprehensive health system with hospitals, research institute, residency programs, outpatient and emergency care centers serving Greater Houston area. |
22,002 | |||
| 8 |
Tenaristenaris.com
A leading supplier of tubes and services for the energy industry and other industrial applications, with a global workforce committed to continuous improvement |
20,000 | |||
| 9 |
Cameron Productsslb.com
A leading provider of flow equipment products, systems, and services for the global oil, gas, and process industries, with a strong global network |
18,396 | |||
| 10 | 16,319 | ||||
| 11 |
LyondellBaselllyondellbasell.com
Leading global chemical company producing innovative polymers and polyolefins for sustainable transportation, food safety, clean water, and healthcare applications. |
15,172 | |||
| 12 |
Phillips 66phillips66.com
A global energy company focused on manufacturing petroleum products, natural gas processing, and petrochemical production, prioritizing safety, honor, and commitment |
14,000 | |||
| 13 |
Oceaneeringoceaneering.com
Global technology company providing engineered services, products, and robotic solutions to offshore energy, defense, aerospace, and manufacturing industries worldwide |
13,838 | |||
| 14 |
Baylor College of Medicinebcm.edu
Health sciences university in Texas Medical Center, conducting research, educating medical professionals, and providing healthcare locally and globally |
13,584 | |||
| 15 |
Texas Children's Hospitaltexaschildrenspeople.org
Comprehensive pediatric care, groundbreaking research, family-centered women's health services, and a supportive work environment focused on community health. |
13,069 | |||
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. | |||||
| 16 |
University of Houstonuh.edu
A public research university in Houston, offering over 250 academic programs to 46,000 students on campus and online, with 10,000 degrees awarded annually |
12,589 | |||
| 17 |
BMC Softwarebmc.com
It provides open, scalable solutions for complex IT challenges, helping organizations innovate and become Autonomous Digital Enterprises for future success. |
8,773 | |||
| 18 |
Nabors Industriesnabors.com
Provider of advanced drilling rigs, automation, and engineering solutions for safe, efficient, and responsible energy production worldwide. |
7,492 | |||
| 19 |
OneSubseaonesubsea.slb.com
A leading subsea technology provider focused on innovation to improve asset performance, increase energy efficiency, reduce emissions, and accelerate the energy transition |
7,149 | |||
| 20 |
Westlakewestlake.com
Manufacturing and supplying petrochemicals, plastics, and building products globally, enhancing daily life through quality products and services. |
6,574 | |||
| 21 | 5,457 | ||||
| 22 |
FMC Technologiestechnipfmc.com
A global leader in the oil and gas industry, specializing in advanced technology and services for subsea, onshore, offshore, and surface projects |
4,841 | |||
| 23 | 2,913 | ||||
| 24 |
Powellpowellind.com
Global manufacturer providing reliable power distribution systems, engineered electrical solutions, automation systems, and services to enhance safety and accessibility to electricity worldwide |
2,865 | |||
| 25 |
Core Laboratoriescorelab.com
A global provider of reservoir description and production enhancement services, offering technologies to optimize reservoir performance and maximize hydrocarbon recovery |
2,667 | |||
| 26 | 2,214 | ||||
| 27 |
Oil States Internationaloilstatesintl.com
A global products and services company serving the energy industry with manufactured equipment for drilling, completion, production, and infrastructure sectors worldwide Headquarters in Houston |
2,181 | |||
| 28 |
Ascend Performance Materialsascendmaterials.com
Global manufacturer specializing in nylon 6,6 materials for diverse applications including apparel, automotive parts, electronics, and industrial products. |
2,065 | |||
| 29 |
Bray International, Inc.bray.com
Global provider of innovative flow control solutions with extensive worldwide offices and distribution networks, committed to quality and customer service. |
2,021 | |||
| 30 |
Quorum Softwarequorumsoftware.com
Provider of software solutions for energy businesses, enabling operational efficiency, data integration, and support for energy transition globally. |
1,745 | |||
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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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The same list elsewhere in United States
- Companies with in-house R&D in the United States 6,796
- Companies with in-house R&D in California 1,276
- Companies with in-house R&D in Texas 442
- Companies with in-house R&D in New York State 419
- Companies with in-house R&D in Massachusetts 396
- Companies with in-house R&D in Illinois 322
- Companies with in-house R&D in Michigan 287
- Companies with in-house R&D in Ohio 277
- Companies with in-house R&D in Pennsylvania 255
- Companies with in-house R&D in New Jersey 224
- Companies with in-house R&D in Florida 221
- Companies with in-house R&D in Alabama 214
- Companies with in-house R&D in Georgia 173
- Companies with in-house R&D in Virginia 166
- Companies with in-house R&D in North Carolina 158
- Companies with in-house R&D in Wisconsin 154
- Companies with in-house R&D in Minnesota 146
- Companies with in-house R&D in Washington State 140
- Companies with in-house R&D in Colorado 113
- Companies with in-house R&D in Maryland 107
- Companies with in-house R&D in Indiana 104
- Companies with in-house R&D in New York 223
- Companies with in-house R&D in San Francisco 147
- Companies with in-house R&D in San Jose 103