This list showcases large corporations with in-house R&D operations across Texas, primarily focusing on technology, energy, and manufacturing sectors. Key players include Oracle, providing cloud infrastructure and AI solutions; AT&T, a telecommunications innovator; Dell Technologies, offering essential technology infrastructure; and SLB, developing advanced energy technologies. These companies represent a mix of established giants and significant employers.
The data reveals a strong concentration of headquarters in major Texan cities, particularly Houston, Dallas, and Austin. Houston stands out with several energy-related companies like SLB, Baker Hughes, Chevron, and Halliburton, alongside tech and manufacturing firms. This geographic clustering points to robust regional ecosystems supporting these industries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Oracleoracle.com
Delivers cloud infrastructure, data, and applications for AI, offering scalable solutions for various deployments, integrating AI into databases, data platforms, and business applications. |
206,235 | |||
| 2 | 193,793 | ||||
| 3 |
Dell Technologiesdell.com
Provide essential technology infrastructure enabling organizations to transform and advance their digital futures through innovative solutions and support. |
133,530 | |||
| 4 |
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 | |||
| 5 | 79,707 | ||||
| 6 | 75,008 | ||||
| 7 |
Baker Hughesbakerhughes.com
Energy technology company providing innovative solutions globally, focusing on safety, efficiency, and sustainability in the energy and industrial sectors |
67,440 | |||
| 8 |
Caterpillar Inc.caterpillar.com
A global leader in manufacturing construction and mining equipment, engines, turbines, and locomotives, focused on sustainability and providing value to customers worldwide |
62,810 | |||
| 9 |
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 | |||
| 10 | 55,736 | ||||
| 11 |
Chevronchevron.com
The company values its people and their innovation in tackling energy challenges, fostering open and respectful communication on LinkedIn |
55,495 | |||
| 12 |
Mary Kay Globalmarykay.com
A global beauty brand empowering women through innovative products, supporting independent contractors, and investing in science, sustainability, and social causes |
50,086 | |||
| 13 |
Kimberly-Clarkkimberly-clark.com
Manufacture and distribute trusted personal care and hygiene products globally, focusing on innovation, sustainability, and improving daily life. |
35,192 | |||
| 14 |
Texas Instrumentsti.com
Design, manufacture, and sell analog and embedded processing chips for industrial, automotive, personal electronics, enterprise, and communications markets. |
33,476 | |||
| 15 |
Charles Schwababoutschwab.com
An investment services firm disrupting traditional Wall Street, offering brokerage, banking, and financial advisory services to improve the investing experience for clients |
32,647 | |||
| 16 |
Baylor Scott & White Healthbswhealth.com
A Texas-based not-for-profit health system dedicated to providing accessible, integrated, and affordable healthcare through a wide network of facilities and services |
31,869 | |||
| 17 |
Texas A&M Universitytamu.edu
Public university offering diverse research, military officer training, athletics, and hosting presidential library with strong community values and hospitality. |
30,552 | |||
| 18 |
The University of Texas at Austinutexas.edu
A prestigious public university with a large campus, diverse academic programs, and a significant number of students, faculty, and staff |
26,268 | |||
| 19 |
McKessonmckesson.com
A global healthcare organization dedicated to advancing health outcomes, providing insights, products, and services to make quality care accessible and affordable |
24,993 | |||
| 20 |
NTT DATA North Americaus.nttdata.com
provides business and technology consulting, data and AI solutions, application development, infrastructure management, and industry-specific services globally |
24,414 | |||
| 21 |
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 | |||
| 22 |
Toyota North Americatoyota.com
Manufacturing high-quality vehicles while prioritizing people, career growth, and leading innovations in future mobility solutions for everyone. |
22,666 | |||
| 23 |
Houston Methodisthoustonmethodist.org
Comprehensive health system with hospitals, research institute, residency programs, outpatient and emergency care centers serving Greater Houston area. |
22,002 | |||
| 24 |
Siemens Digital Industries Softwaresiemens.com
The company helps organizations digitally transform using Siemens Xcelerator platform, optimizing design, engineering, and manufacturing processes to create sustainable products |
20,925 | |||
| 25 |
UT Southwestern Medical Centerutsouthwestern.edu
An academic medical center with top research, education, and patient care; offering training to students and providing specialized healthcare services |
19,275 | |||
| 26 |
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 | |||
| 27 |
Infosys Ltdinfosys.com
Global leader in next-generation digital services and consulting, enabling clients worldwide to navigate digital transformation with AI-powered solutions and agile digital delivery for performance and customer satisfaction |
17,979 | |||
| 28 | 16,319 | ||||
| 29 |
NetSuitenetsuite.com
A pioneering cloud-based company offering integrated business solutions including financials, ERP, inventory management, HR, and omnichannel commerce to global customers |
15,622 | |||
| 30 |
LyondellBaselllyondellbasell.com
Leading global chemical company producing innovative polymers and polyolefins for sustainable transportation, food safety, clean water, and healthcare applications. |
15,172 | |||
| 31 |
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 | |||
| 32 |
Oceaneeringoceaneering.com
Global technology company providing engineered services, products, and robotic solutions to offshore energy, defense, aerospace, and manufacturing industries worldwide |
13,838 | |||
| 33 |
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 | |||
| 34 |
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 | |||
| 35 |
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 | |||
| 36 |
The University of Texas Medical Branchutmb.edu
A major academic medical center in Galveston, Texas, offering schools of Medicine, Nursing, Health Professions, research, inpatient care, trauma center, and outpatient clinics |
12,118 | |||
| 37 |
Texas Tech Universityttu.edu
A leading research institution with record enrollment numbers, fostering a culture of excellence through top-notch faculty and individual student focus |
11,651 | |||
| 38 |
Epsilonepsilon.com
It provides data-driven marketing solutions, enabling brands to engage consumers effectively across various channels using advanced technology and analytics. |
11,146 | |||
| 39 |
Texas State Universitytxst.edu
Public university educating over 40,000 students through 200+ degree programs, focusing on innovation, economic growth, and community impact. |
9,678 | |||
| 40 |
RealPage, Inc.realpage.com
Global provider of software and data analytics for the real estate industry, helping clients improve performance and increase returns with innovative solutions |
9,112 | |||
| 41 |
The University of Texas at Arlingtonuta.edu
A growing research powerhouse committed to discovery, innovative instruction, and community engagement, improving quality of life in Texas and beyond |
9,020 | |||
| 42 |
IKS Healthikshealth.com
Revitalizing clinician-patient relationships by relieving healthcare organizations of administrative burdens, enabling focus on delivering quality care through technology and expertise |
9,019 | |||
| 43 |
Action Behavior Centers - ABA Therapy for Autismactionbehavior.com
Provide individualized ABA therapy, diagnostic support, parent training, and school readiness programs for children with autism across multiple states. |
8,869 | |||
| 44 |
Bell Flightbellflight.com
Design and manufacture of helicopters and tiltrotor aircraft, pioneering aviation technology with a focus on safety and reliability. |
8,859 | |||
| 45 |
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 | |||
| 46 |
UT Health San Antoniouthscsa.edu
Leading health sciences university in Texas with a strong focus on NIH funding, producing thousands of alumni in various health-related fields |
8,661 | |||
| 47 |
Children's Healthjobsearch.childrens.com
A leading pediatric health care provider in North Texas, offering comprehensive services, innovative treatments, and groundbreaking research for children's health and wellness |
8,516 | |||
| 48 |
NI (National Instruments)ni.com
The company engineers solutions using cutting-edge technology, automation, and software to help customers solve technology challenges and build better businesses |
7,971 | |||
| 49 |
Tyler Technologiestylertech.com
Provides integrated software and technology services enabling government entities to operate efficiently, transparently, and connect data across systems. |
7,873 | |||
| 50 |
Nabors Industriesnabors.com
Provider of advanced drilling rigs, automation, and engineering solutions for safe, efficient, and responsible energy production worldwide. |
7,492 | |||
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. | |||||
| 51 |
Celanesecelanese.com
Global leader in chemistry, producing specialty material solutions for various industries through sustainable practices, innovation, and community involvement |
7,348 | |||
| 52 |
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 | |||
| 53 |
Lennoxlennox.com
A leading provider of climate control solutions for HVACR markets, focusing on innovation, energy efficiency, and a healthy environment with a diverse, engaged workforce |
7,132 | |||
| 54 |
Huntsman Corporationhuntsman.com
A global chemical company focused on shaping a sustainable future through innovative products that enhance energy efficiency and reduce waste and emissions |
6,996 | |||
| 55 |
American Bureau of Shipping (ABS)ww2.eagle.org
Establishes safety standards and technical solutions for marine and offshore industries through ship classification, engineering research, and global regulatory compliance support. |
6,833 | |||
| 56 |
Goodman Air Conditioning & Heatinggoodmanmfg.com
A leading HVAC manufacturer since 1982, providing reliable, high-quality, energy-efficient heating and cooling products designed and assembled in the USA |
6,796 | |||
| 57 |
The University of Texas at El Pasoutep.edu
Leading Hispanic-serving university offering 171 degree programs Located in Texas, with majority Hispanic students, many first-generation college attendees Active on social media |
6,675 | |||
| 58 |
Westlakewestlake.com
Manufacturing and supplying petrochemicals, plastics, and building products globally, enhancing daily life through quality products and services. |
6,574 | |||
| 59 |
Epicorepicor.com
It provides innovative solutions tailored for hard-working businesses, helping them grow, transform, and improve productivity in their industries. |
6,194 | |||
| 60 |
ATIatimaterials.com
A global leader in materials science, providing solutions for extreme challenges in aerospace, defense, medical, and industrial applications worldwide |
5,959 | |||
| 61 |
NXP acquires Freescale Semiconductornxp.com
A company specializing in semiconductors previously known as Freeascale, Inc has been acquired by NXP Semiconductors Visit their page for updates |
5,929 | |||
| 62 |
Nateranatera.com
Global leader in cell-free DNA testing for oncology, women's health, and organ health Pioneering noninvasive testing to inform proactive treatment worldwide |
5,791 | |||
| 63 | 5,457 | ||||
| 64 |
Texas Tech University Health Sciences Centerttuhsc.edu
A leading health sciences institution offering education, patient care, and research with campuses across West Texas, training thousands of healthcare professionals |
5,342 | |||
| 65 |
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 | |||
| 66 |
Epicor Softwareepicor.com
Providing tailored software solutions to manufacturing, delivery, and sales businesses, enhancing productivity, growth, and operational effectiveness. |
4,802 | |||
| 67 |
Hanger, Inc.corporate.hanger.com
Provides orthotic and prosthetic patient care, designs and manufactures devices, offers consulting and rehabilitative services nationwide. |
4,737 | |||
| 68 |
Chevron Phillips Chemical Companycpchem.com
Leading global manufacturer and supplier of olefins, polyolefins, aromatics, specialty chemicals, plastic piping, and polymer resins with extensive facilities. |
4,704 | |||
| 69 |
Daikin Comfortdaikincomfort.com
Leading global provider of heating and cooling solutions, improving environment and quality of life across over 140 countries worldwide. |
4,475 | |||
| 70 |
Siemens PLM Software (inactive)sw.siemens.com
Drives enterprise transformation, enabling digital engineering, manufacturing, electronics design. Solutions create digital twins providing insights, automation for innovation for companies. |
4,233 | |||
| 71 |
University Healthuniversityhealth.com
A nationally recognized hospital and outpatient healthcare network in Bexar County, committed to patient-centered care, research, teaching, and innovation |
4,152 | |||
| 72 |
Ribbon Communicationsribboncommunications.com
Provides communications software, IP and optical networking solutions for service providers, enterprises, and critical infrastructure with modern, scalable, and secure technologies. |
4,092 | |||
| 73 |
Texas Oncologytexasoncology.com
Pioneering provider of high-quality, community-based cancer care with over 530 physicians and 280 locations in Texas and Oklahoma Leading in innovative treatments and clinical trials |
4,017 | |||
| 74 |
Trellixtrellix.com
Delivers intelligence-led cyber resilience for security-conscious organizations. Transforms threat intelligence into high-fidelity detections and automates AI-driven detection and response across diverse environments. |
3,827 | |||
| 75 |
Integer Holdings Corporationinteger.net
Provides contract development and manufacturing for medical devices, focusing on cardiac rhythm, neuromodulation, and cardio/vascular markets. Supplies innovative, high-quality products to medical companies. |
3,810 | |||
| 76 |
SailPointsailpoint.com
Provides an identity security platform to manage and secure access to applications and data, defending against cyber threats and enhancing productivity for enterprises. |
3,699 | |||
| 77 |
Quest Softwarequest.com
Provides software solutions for data management, cybersecurity, and platform modernization, enabling organizations to build trusted foundations for AI success with speed and confidence. |
3,567 | |||
| 78 |
Lamar Universitylamar.edu
A member of The Texas State University System offering over 100 programs leading to bachelor's, master's, and doctoral degrees |
3,430 | |||
| 79 |
Omnicellomnicell.com
Transforming pharmacy care delivery with Advanced Services for central pharmacy, IV compounding, inventory optimization, and connecting settings of care with technology |
3,400 | |||
| 80 |
o9 Solutions, Inc.o9solutions.com
The company specializes in providing faster, more intelligent planning and business decision-making solutions to help enterprises achieve their goals while using fewer resources |
3,278 | |||
| 81 |
Hilti North Americahilti.com
Providing innovative tools, fasteners, software, and services to enhance construction speed, safety, and sustainability for professionals. |
3,241 | |||
| 82 |
Dover Fueling Solutionsdoverfuelingsolutions.com
Provider of advanced energy dispensing equipment, automation systems, and payment solutions for global fueling and convenience retail customers Offers clean energy products and subscription services |
3,193 | |||
| 83 |
Southwest Research Instituteswri.org
Independent nonprofit organization specializing in creating and transferring technology in engineering and physical sciences, with laboratories and facilities across multiple locations. |
3,135 | |||
| 84 |
Tokyo Electron UStel.com
Engineering, manufacturing, selling, and servicing wafer-processing, flat panel display, and thin-film silicon photovoltaic equipment worldwide. |
3,086 | |||
| 85 |
HKS, Inc.hksinc.com
A global architecture and design firm with a focus on sustainability, creativity, and delivering elegant solutions for clients and collaborators |
2,916 | |||
| 86 | 2,913 | ||||
| 87 |
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 | |||
| 88 | 2,856 | ||||
| 89 |
East Texas A&M Universitytamuc.edu
A university focused on individual success, providing support, personalized education, and opportunities for growth, preparing students for the marketplace |
2,692 | |||
| 90 |
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 | |||
| 91 |
Silicon Labssilabs.com
A company specializing in secure, intelligent wireless technology to create a more connected world |
2,579 | |||
| 92 |
ALKEGENalkegen.com
Specialty materials leader for mission-critical systems in battery technologies, electric vehicles, filtration media, and insulation materials to promote sustainability and energy savings |
2,527 | |||
| 93 |
Helen of Troycareers.helenoftroy.com
This company provides products found in homes improving everyday life, with a focus on inclusion and empowerment of talent |
2,416 | |||
| 94 |
DJOenovis.com
Enovis, formerly DJO, specializes in medical technology, offering products for performance, mobility, surgical intervention, and post-operative rehabilitation through various brands. |
2,241 | |||
| 95 | 2,214 | ||||
| 96 |
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 | |||
| 97 |
Mitratechmitratech.com
It provides technology solutions for corporate legal, risk, compliance, and HR professionals to enhance productivity, control expenses, and mitigate risks. |
2,094 | |||
| 98 |
Textron Systemstextronsystems.com
Innovative solutions provider to defense, homeland security, and aerospace sectors Specializing in unmanned aircraft, marine craft, armored vehicles, and intelligence software |
2,084 | |||
| 99 |
Vistance Networksvistancenetworks.com
Provides reliable communication technology solutions focused on performance, innovation, and customer-driven value for a dynamic global market. |
2,068 | |||
| 100 |
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 | |||
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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.
More company lists in Texas
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- Multinational companies in Texas 1,418
- Oil and Gas companies in Texas 969
- Energy companies in Texas 857
- IT Services and IT Consulting companies in Texas 834
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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 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 Houston 129
- Companies with in-house R&D in San Jose 103