# 30 leading companies with in-house R&D in Houston

Tamtam tracks 129 companies with in-house R&D headquartered in Houston. This list ranks the 30 largest by number of employees on LinkedIn, led by Hewlett Packard Enterprise, SLB and Baker Hughes. Their median headcount is 13,069. Half of them were founded in 1980 or later.

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.

🇺🇸 Houston · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Hewlett Packard Enterprise](https://www.tamtam.ai/c/hewlett-packard-enterprise) (hpe.com)<br>This company is a global edge-to-cloud company that drives technology and innovation to fulfill its passion and purpose | IT Services and IT Consulting | 🇺🇸 Houston | 90,021 |  |
| 2 | [SLB](https://www.tamtam.ai/c/slb-houston) (slb.com)<br>Global innovators developing advanced technologies to unlock energy access while reducing carbon emissions through sustainable engineering and diverse technical change maker expertise. | Technology, Information and Internet | 🇺🇸 Houston | 79,707 |  |
| 3 | [Baker Hughes](https://www.tamtam.ai/c/baker-hughes-houston) (bakerhughes.com)<br>Energy technology company providing innovative solutions globally, focusing on safety, efficiency, and sustainability in the energy and industrial sectors | Energy Technology | 🇺🇸 Houston | 67,440 |  |
| 4 | [Halliburton](https://www.tamtam.ai/c/halliburton) (halliburton.com)<br>Collaborates to engineer solutions maximizing energy asset value, from locating hydrocarbons, managing data, drilling, evaluating, and constructing wells, to optimizing production. | Oil and Gas | 🇺🇸 Houston | 60,277 | 1919 |
| 5 | [Chevron](https://www.tamtam.ai/c/chevron) (chevron.com)<br>The company values its people and their innovation in tackling energy challenges, fostering open and respectful communication on LinkedIn | Oil and Gas | 🇺🇸 Houston | 55,495 |  |
| 6 | [UT MD Anderson](https://www.tamtam.ai/c/ut-md-anderson) (mdanderson.org)<br>A leading cancer center focused on patient care, research, education, and prevention, with top rankings in cancer care and a mission to #EndCancer | Hospitals and Health Care | 🇺🇸 Houston | 23,100 | 1944 |
| 7 | [Houston Methodist](https://www.tamtam.ai/c/houston-methodist) (houstonmethodist.org)<br>Comprehensive health system with hospitals, research institute, residency programs, outpatient and emergency care centers serving Greater Houston area. | Hospitals and Health Care | 🇺🇸 Houston | 22,002 |  |
| 8 | [Tenaris](https://www.tamtam.ai/c/tenaris) (tenaris.com)<br>A leading supplier of tubes and services for the energy industry and other industrial applications, with a global workforce committed to continuous improvement | Oil and Gas | 🇺🇸 Houston | 20,000 | 2002 |
| 9 | [Cameron Products](https://www.tamtam.ai/c/cameron-products) (slb.com)<br>A leading provider of flow equipment products, systems, and services for the global oil, gas, and process industries, with a strong global network | Oil and Gas | 🇺🇸 Houston | 18,396 |  |
| 10 | [Oxy](https://www.tamtam.ai/c/oxy) (oxy.com)<br>An international energy company with assets in the US, Middle East, and North Africa, focused on oil production, midstream services, chemical manufacturing, and carbon reduction technologies | Oil and Gas | 🇺🇸 Houston | 16,319 |  |
| 11 | [LyondellBasell](https://www.tamtam.ai/c/lyondellbasell-houston) (lyondellbasell.com)<br>Leading global chemical company producing innovative polymers and polyolefins for sustainable transportation, food safety, clean water, and healthcare applications. | Chemical Manufacturing | 🇺🇸 Houston | 15,172 | 2007 |
| 12 | [Phillips 66](https://www.tamtam.ai/c/phillips-66) (phillips66.com)<br>A global energy company focused on manufacturing petroleum products, natural gas processing, and petrochemical production, prioritizing safety, honor, and commitment | Oil and Gas | 🇺🇸 Houston | 14,000 |  |
| 13 | [Oceaneering](https://www.tamtam.ai/c/oceaneering) (oceaneering.com)<br>Global technology company providing engineered services, products, and robotic solutions to offshore energy, defense, aerospace, and manufacturing industries worldwide | Oil and Gas | 🇺🇸 Houston | 13,838 | 1964 |
| 14 | [Baylor College of Medicine](https://www.tamtam.ai/c/baylor-college-of-medicine) (bcm.edu)<br>Health sciences university in Texas Medical Center, conducting research, educating medical professionals, and providing healthcare locally and globally | Higher Education | 🇺🇸 Houston | 13,584 | 1900 |
| 15 | [Texas Children's Hospital](https://www.tamtam.ai/c/texas-children-s-hospital) (texaschildrenspeople.org)<br>Comprehensive pediatric care, groundbreaking research, family-centered women's health services, and a supportive work environment focused on community health. | Hospitals and Health Care | 🇺🇸 Houston | 13,069 | 1954 |
| 16 | [University of Houston](https://www.tamtam.ai/c/university-of-houston) (uh.edu)<br>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 | Higher Education | 🇺🇸 Houston | 12,589 | 1927 |
| 17 | [BMC Software](https://www.tamtam.ai/c/bmc-software) (bmc.com)<br>It provides open, scalable solutions for complex IT challenges, helping organizations innovate and become Autonomous Digital Enterprises for future success. | IT Services and IT Consulting | 🇺🇸 Houston | 8,773 | 1980 |
| 18 | [Nabors Industries](https://www.tamtam.ai/c/nabors-industries) (nabors.com)<br>Provider of advanced drilling rigs, automation, and engineering solutions for safe, efficient, and responsible energy production worldwide. | Oil and Gas | 🇺🇸 Houston | 7,492 | 1952 |
| 19 | [OneSubsea](https://www.tamtam.ai/c/onesubsea) (onesubsea.slb.com)<br>A leading subsea technology provider focused on innovation to improve asset performance, increase energy efficiency, reduce emissions, and accelerate the energy transition | Oil and Gas | 🇺🇸 Houston | 7,149 | 2023 |
| 20 | [Westlake](https://www.tamtam.ai/c/westlake) (westlake.com)<br>Manufacturing and supplying petrochemicals, plastics, and building products globally, enhancing daily life through quality products and services. | Chemical Manufacturing | 🇺🇸 Houston | 6,574 | 1986 |
| 21 | [NESR](https://www.tamtam.ai/c/nesr) (nesr.com)<br>Provides production services like fracturing, cementing, and coiled tubing, along with drilling and evaluation services including downhole tools and wireline, for oil and gas customers. | Oil and Gas | 🇺🇸 Houston | 5,457 | 2017 |
| 22 | [FMC Technologies](https://www.tamtam.ai/c/fmc-technologies) (technipfmc.com)<br>A global leader in the oil and gas industry, specializing in advanced technology and services for subsea, onshore, offshore, and surface projects | Oil and Gas | 🇺🇸 Houston | 4,841 | 2001 |
| 23 | [TGS](https://www.tamtam.ai/c/tgs-houston) (tgs.com)<br>Provides scientific energy data, advanced processing, analytics, and cloud-based applications to support companies in the energy sector. | Data Infrastructure and Analytics | 🇺🇸 Houston | 2,913 | 1981 |
| 24 | [Powell](https://www.tamtam.ai/c/powell-houston) (powellind.com)<br>Global manufacturer providing reliable power distribution systems, engineered electrical solutions, automation systems, and services to enhance safety and accessibility to electricity worldwide | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Houston | 2,865 | 1947 |
| 25 | [Core Laboratories](https://www.tamtam.ai/c/core-laboratories) (corelab.com)<br>A global provider of reservoir description and production enhancement services, offering technologies to optimize reservoir performance and maximize hydrocarbon recovery | Oil and Gas | 🇺🇸 Houston | 2,667 | 1936 |
| 26 | [PROS](https://www.tamtam.ai/c/pros) (pros.com)<br>It provides AI-powered SaaS solutions for pricing, revenue management, and digital marketing, helping businesses optimize sales and drive growth. | Software Development | 🇺🇸 Houston | 2,214 |  |
| 27 | [Oil States International](https://www.tamtam.ai/c/oil-states-international) (oilstatesintl.com)<br>A global products and services company serving the energy industry with manufactured equipment for drilling, completion, production, and infrastructure sectors worldwide Headquarters in Houston | Oil and Gas | 🇺🇸 Houston | 2,181 |  |
| 28 | [Ascend Performance Materials](https://www.tamtam.ai/c/ascend-performance-materials) (ascendmaterials.com)<br>Global manufacturer specializing in nylon 6,6 materials for diverse applications including apparel, automotive parts, electronics, and industrial products. | Chemical Manufacturing | 🇺🇸 Houston | 2,065 | 2009 |
| 29 | [Bray International, Inc.](https://www.tamtam.ai/c/bray-international-inc) (bray.com)<br>Global provider of innovative flow control solutions with extensive worldwide offices and distribution networks, committed to quality and customer service. | Industrial Machinery Manufacturing | 🇺🇸 Houston | 2,021 |  |
| 30 | [Quorum Software](https://www.tamtam.ai/c/quorum-software) (quorumsoftware.com)<br>Provider of software solutions for energy businesses, enabling operational efficiency, data integration, and support for energy transition globally. | Software Development | 🇺🇸 Houston | 1,745 | 1998 |

## 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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Source: https://www.tamtam.ai/l/r-and-d-companies-houston