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

Tamtam tracks 442 companies with in-house R&D headquartered in Texas. This list ranks the 100 largest by number of employees on LinkedIn, led by Oracle, AT&T and Dell Technologies. Their median headcount is 7,492. Half of them were founded in 1964 or later. The most common headquarters are Houston (27), Austin (17) and Dallas (12).

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.

🇺🇸 Texas · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Oracle](https://www.tamtam.ai/c/oracle) (oracle.com)<br>Delivers cloud infrastructure, data, and applications for AI, offering scalable solutions for various deployments, integrating AI into databases, data platforms, and business applications. | IT Services and IT Consulting | 🇺🇸 Austin | 206,235 | 1977 |
| 2 | [AT&T](https://www.tamtam.ai/c/at-and-t) (att.com)<br>Innovative company connecting people with technology to create a seamless, better life through network, products, services, and passionate employees | Telecommunications | 🇺🇸 Dallas | 193,793 |  |
| 3 | [Dell Technologies](https://www.tamtam.ai/c/dell-technologies) (dell.com)<br>Provide essential technology infrastructure enabling organizations to transform and advance their digital futures through innovative solutions and support. | Computer Hardware Manufacturing | 🇺🇸 Round Rock | 133,530 | 1984 |
| 4 | [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 |  |
| 5 | [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 |  |
| 6 | [CBRE](https://www.tamtam.ai/c/cbre) (cbre.com)<br>A real estate company providing comprehensive services and insights to empower clients in maximizing opportunities and success in the industry | Real Estate | 🇺🇸 Dallas | 75,008 |  |
| 7 | [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 |  |
| 8 | [Caterpillar Inc.](https://www.tamtam.ai/c/caterpillar-inc) (caterpillar.com)<br>A global leader in manufacturing construction and mining equipment, engines, turbines, and locomotives, focused on sustainability and providing value to customers worldwide | Machinery Manufacturing | 🇺🇸 Irving | 62,810 | 1925 |
| 9 | [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 |
| 10 | [Flex](https://www.tamtam.ai/c/flex-austin) (flex.com)<br>Manufacturing partner supporting diverse customers in designing and building innovative products aimed at improving the world and daily life. | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Austin | 55,736 |  |
| 11 | [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 |  |
| 12 | [Mary Kay Global](https://www.tamtam.ai/c/mary-kay-global) (marykay.com)<br>A global beauty brand empowering women through innovative products, supporting independent contractors, and investing in science, sustainability, and social causes | Personal Care Product Manufacturing | 🇺🇸 Addison | 50,086 |  |
| 13 | [Kimberly-Clark](https://www.tamtam.ai/c/kimberly-clark) (kimberly-clark.com)<br>Manufacture and distribute trusted personal care and hygiene products globally, focusing on innovation, sustainability, and improving daily life. | Manufacturing | 🇺🇸 Irving | 35,192 |  |
| 14 | [Texas Instruments](https://www.tamtam.ai/c/texas-instruments) (ti.com)<br>Design, manufacture, and sell analog and embedded processing chips for industrial, automotive, personal electronics, enterprise, and communications markets. | Semiconductor Manufacturing | 🇺🇸 Dallas | 33,476 |  |
| 15 | [Charles Schwab](https://www.tamtam.ai/c/charles-schwab) (aboutschwab.com)<br>An investment services firm disrupting traditional Wall Street, offering brokerage, banking, and financial advisory services to improve the investing experience for clients | Financial Services | 🇺🇸 Westlake | 32,647 |  |
| 16 | [Baylor Scott & White Health](https://www.tamtam.ai/c/baylor-scott-and-white-health) (bswhealth.com)<br>A Texas-based not-for-profit health system dedicated to providing accessible, integrated, and affordable healthcare through a wide network of facilities and services | Hospitals and Health Care | 🇺🇸 Dallas | 31,869 | 1903 |
| 17 | [Texas A&M University](https://www.tamtam.ai/c/texas-a-and-m-university) (tamu.edu)<br>Public university offering diverse research, military officer training, athletics, and hosting presidential library with strong community values and hospitality. | Higher Education | 🇺🇸 College Station | 30,552 | 1876 |
| 18 | [The University of Texas at Austin](https://www.tamtam.ai/c/the-university-of-texas-at-austin) (utexas.edu)<br>A prestigious public university with a large campus, diverse academic programs, and a significant number of students, faculty, and staff | Higher Education | 🇺🇸 Austin | 26,268 | 1883 |
| 19 | [McKesson](https://www.tamtam.ai/c/mckesson) (mckesson.com)<br>A global healthcare organization dedicated to advancing health outcomes, providing insights, products, and services to make quality care accessible and affordable | Hospitals and Health Care | 🇺🇸 Irving | 24,993 |  |
| 20 | [NTT DATA North America](https://www.tamtam.ai/c/ntt-data-north-america) (us.nttdata.com)<br>provides business and technology consulting, data and AI solutions, application development, infrastructure management, and industry-specific services globally | IT Services and IT Consulting | 🇺🇸 Plano | 24,414 |  |
| 21 | [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 |
| 22 | [Toyota North America](https://www.tamtam.ai/c/toyota-north-america) (toyota.com)<br>Manufacturing high-quality vehicles while prioritizing people, career growth, and leading innovations in future mobility solutions for everyone. | Motor Vehicle Manufacturing | 🇺🇸 Plano | 22,666 | 1957 |
| 23 | [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 |  |
| 24 | [Siemens Digital Industries Software](https://www.tamtam.ai/c/siemens-digital-industries-software) (siemens.com)<br>The company helps organizations digitally transform using Siemens Xcelerator platform, optimizing design, engineering, and manufacturing processes to create sustainable products | Software Development | 🇺🇸 Plano | 20,925 |  |
| 25 | [UT Southwestern Medical Center](https://www.tamtam.ai/c/ut-southwestern-medical-center) (utsouthwestern.edu)<br>An academic medical center with top research, education, and patient care; offering training to students and providing specialized healthcare services | Hospitals and Health Care | 🇺🇸 Dallas | 19,275 | 1943 |
| 26 | [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 |  |
| 27 | [Infosys Ltd](https://www.tamtam.ai/c/infosys-ltd-richardson) (infosys.com)<br>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 | IT Services and IT Consulting | 🇺🇸 Tx 75082 | 17,979 | 1981 |
| 28 | [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 |  |
| 29 | [NetSuite](https://www.tamtam.ai/c/netsuite) (netsuite.com)<br>A pioneering cloud-based company offering integrated business solutions including financials, ERP, inventory management, HR, and omnichannel commerce to global customers | Software Development | 🇺🇸 Austin | 15,622 | 1998 |
| 30 | [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 |
| 31 | [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 |  |
| 32 | [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 |
| 33 | [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 |
| 34 | [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 |
| 35 | [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 |
| 36 | [The University of Texas Medical Branch](https://www.tamtam.ai/c/the-university-of-texas-medical-branch) (utmb.edu)<br>A major academic medical center in Galveston, Texas, offering schools of Medicine, Nursing, Health Professions, research, inpatient care, trauma center, and outpatient clinics | Hospitals and Health Care | 🇺🇸 Galveston | 12,118 | 1891 |
| 37 | [Texas Tech University](https://www.tamtam.ai/c/texas-tech-university) (ttu.edu)<br>A leading research institution with record enrollment numbers, fostering a culture of excellence through top-notch faculty and individual student focus | Higher Education | 🇺🇸 | 11,651 |  |
| 38 | [Epsilon](https://www.tamtam.ai/c/epsilon) (epsilon.com)<br>It provides data-driven marketing solutions, enabling brands to engage consumers effectively across various channels using advanced technology and analytics. | Advertising Services | 🇺🇸 Irving | 11,146 |  |
| 39 | [Texas State University](https://www.tamtam.ai/c/texas-state-university) (txst.edu)<br>Public university educating over 40,000 students through 200+ degree programs, focusing on innovation, economic growth, and community impact. | Higher Education | 🇺🇸 San Marcos | 9,678 | 1899 |
| 40 | [RealPage, Inc.](https://www.tamtam.ai/c/realpage-inc) (realpage.com)<br>Global provider of software and data analytics for the real estate industry, helping clients improve performance and increase returns with innovative solutions | Software Development | 🇺🇸 Richardson | 9,112 |  |
| 41 | [The University of Texas at Arlington](https://www.tamtam.ai/c/the-university-of-texas-at-arlington) (uta.edu)<br>A growing research powerhouse committed to discovery, innovative instruction, and community engagement, improving quality of life in Texas and beyond | Higher Education | 🇺🇸 Arlington | 9,020 | 1895 |
| 42 | [IKS Health](https://www.tamtam.ai/c/iks-health) (ikshealth.com)<br>Revitalizing clinician-patient relationships by relieving healthcare organizations of administrative burdens, enabling focus on delivering quality care through technology and expertise | Hospitals and Health Care | 🇺🇸 Dallas | 9,019 | 2006 |
| 43 | [Action Behavior Centers - ABA Therapy for Autism](https://www.tamtam.ai/c/action-behavior-centers-aba-therapy-for-autism) (actionbehavior.com)<br>Provide individualized ABA therapy, diagnostic support, parent training, and school readiness programs for children with autism across multiple states. | Mental Health Care | 🇺🇸 Austin | 8,869 | 2017 |
| 44 | [Bell Flight](https://www.tamtam.ai/c/bell-flight) (bellflight.com)<br>Design and manufacture of helicopters and tiltrotor aircraft, pioneering aviation technology with a focus on safety and reliability. | Aviation and Aerospace Component Manufacturing | 🇺🇸 Fort Worth | 8,859 | 1935 |
| 45 | [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 |
| 46 | [UT Health San Antonio](https://www.tamtam.ai/c/ut-health-san-antonio) (uthscsa.edu)<br>Leading health sciences university in Texas with a strong focus on NIH funding, producing thousands of alumni in various health-related fields | Higher Education | 🇺🇸 San Antonio | 8,661 | 1959 |
| 47 | [Children's Health](https://www.tamtam.ai/c/children-s-health) (jobsearch.childrens.com)<br>A leading pediatric health care provider in North Texas, offering comprehensive services, innovative treatments, and groundbreaking research for children's health and wellness | Hospitals and Health Care | 🇺🇸 Dallas | 8,516 | 1913 |
| 48 | [NI (National Instruments)](https://www.tamtam.ai/c/ni-national-instruments) (ni.com)<br>The company engineers solutions using cutting-edge technology, automation, and software to help customers solve technology challenges and build better businesses | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Austin | 7,971 | 1976 |
| 49 | [Tyler Technologies](https://www.tamtam.ai/c/tyler-technologies) (tylertech.com)<br>Provides integrated software and technology services enabling government entities to operate efficiently, transparently, and connect data across systems. | Software Development | 🇺🇸 Plano | 7,873 |  |
| 50 | [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 |
| 51 | [Celanese](https://www.tamtam.ai/c/celanese) (celanese.com)<br>Global leader in chemistry, producing specialty material solutions for various industries through sustainable practices, innovation, and community involvement | Chemical Manufacturing | 🇺🇸 Irving | 7,348 | 1912 |
| 52 | [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 |
| 53 | [Lennox](https://www.tamtam.ai/c/lennox) (lennox.com)<br>A leading provider of climate control solutions for HVACR markets, focusing on innovation, energy efficiency, and a healthy environment with a diverse, engaged workforce | Manufacturing | 🇺🇸 Richardson | 7,132 | 1895 |
| 54 | [Huntsman Corporation](https://www.tamtam.ai/c/huntsman-corporation) (huntsman.com)<br>A global chemical company focused on shaping a sustainable future through innovative products that enhance energy efficiency and reduce waste and emissions | Chemical Manufacturing | 🇺🇸 The Woodlands | 6,996 | 1970 |
| 55 | [American Bureau of Shipping (ABS)](https://www.tamtam.ai/c/american-bureau-of-shipping-abs) (ww2.eagle.org)<br>Establishes safety standards and technical solutions for marine and offshore industries through ship classification, engineering research, and global regulatory compliance support. | Maritime Transportation | 🇺🇸 Spring | 6,833 | 1862 |
| 56 | [Goodman Air Conditioning & Heating](https://www.tamtam.ai/c/goodman-air-conditioning-and-heating) (goodmanmfg.com)<br>A leading HVAC manufacturer since 1982, providing reliable, high-quality, energy-efficient heating and cooling products designed and assembled in the USA | Manufacturing | 🇺🇸 Waller | 6,796 |  |
| 57 | [The University of Texas at El Paso](https://www.tamtam.ai/c/the-university-of-texas-at-el-paso) (utep.edu)<br>Leading Hispanic-serving university offering 171 degree programs Located in Texas, with majority Hispanic students, many first-generation college attendees Active on social media | Higher Education | 🇺🇸 El Paso | 6,675 | 1914 |
| 58 | [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 |
| 59 | [Epicor](https://www.tamtam.ai/c/epicor) (epicor.com)<br>It provides innovative solutions tailored for hard-working businesses, helping them grow, transform, and improve productivity in their industries. | Software Development | 🇺🇸 Austin | 6,194 | 1972 |
| 60 | [ATI](https://www.tamtam.ai/c/ati-dallas) (atimaterials.com)<br>A global leader in materials science, providing solutions for extreme challenges in aerospace, defense, medical, and industrial applications worldwide | Aviation and Aerospace Component Manufacturing | 🇺🇸 Dallas | 5,959 | 1996 |
| 61 | [NXP acquires Freescale Semiconductor](https://www.tamtam.ai/c/nxp-acquires-freescale-semiconductor) (nxp.com)<br>A company specializing in semiconductors previously known as Freeascale, Inc has been acquired by NXP Semiconductors Visit their page for updates | Semiconductor Manufacturing | 🇺🇸 Austin | 5,929 | 2004 |
| 62 | [Natera](https://www.tamtam.ai/c/natera) (natera.com)<br>Global leader in cell-free DNA testing for oncology, women's health, and organ health Pioneering noninvasive testing to inform proactive treatment worldwide | Biotechnology Research | 🇺🇸 Austin | 5,791 | 2004 |
| 63 | [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 |
| 64 | [Texas Tech University Health Sciences Center](https://www.tamtam.ai/c/texas-tech-university-health-sciences-center) (ttuhsc.edu)<br>A leading health sciences institution offering education, patient care, and research with campuses across West Texas, training thousands of healthcare professionals | Higher Education | 🇺🇸 Lubbock | 5,342 | 1969 |
| 65 | [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 |
| 66 | [Epicor Software](https://www.tamtam.ai/c/epicor-software) (epicor.com)<br>Providing tailored software solutions to manufacturing, delivery, and sales businesses, enhancing productivity, growth, and operational effectiveness. | Other | 🇺🇸 Austin | 4,802 | 1972 |
| 67 | [Hanger, Inc.](https://www.tamtam.ai/c/hanger-inc) (corporate.hanger.com)<br>Provides orthotic and prosthetic patient care, designs and manufactures devices, offers consulting and rehabilitative services nationwide. | Hospitals and Health Care | 🇺🇸 Austin | 4,737 | 1861 |
| 68 | [Chevron Phillips Chemical Company](https://www.tamtam.ai/c/chevron-phillips-chemical-company) (cpchem.com)<br>Leading global manufacturer and supplier of olefins, polyolefins, aromatics, specialty chemicals, plastic piping, and polymer resins with extensive facilities. | Chemical Manufacturing | 🇺🇸 Spring | 4,704 | 2000 |
| 69 | [Daikin Comfort](https://www.tamtam.ai/c/daikin-comfort) (daikincomfort.com)<br>Leading global provider of heating and cooling solutions, improving environment and quality of life across over 140 countries worldwide. | Industrial Machinery Manufacturing | 🇺🇸 Waller | 4,475 | 1924 |
| 70 | [Siemens PLM Software (inactive)](https://www.tamtam.ai/c/siemens-plm-software-inactive) (sw.siemens.com)<br>Drives enterprise transformation, enabling digital engineering, manufacturing, electronics design. Solutions create digital twins providing insights, automation for innovation for companies. | Software Development | 🇺🇸 Plano | 4,233 |  |
| 71 | [University Health](https://www.tamtam.ai/c/university-health) (universityhealth.com)<br>A nationally recognized hospital and outpatient healthcare network in Bexar County, committed to patient-centered care, research, teaching, and innovation | Hospitals and Health Care | 🇺🇸 San Antonio | 4,152 | 1917 |
| 72 | [Ribbon Communications](https://www.tamtam.ai/c/ribbon-communications) (ribboncommunications.com)<br>Provides communications software, IP and optical networking solutions for service providers, enterprises, and critical infrastructure with modern, scalable, and secure technologies. | Telecommunications | 🇺🇸 Plano | 4,092 |  |
| 73 | [Texas Oncology](https://www.tamtam.ai/c/texas-oncology) (texasoncology.com)<br>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 | Hospitals and Health Care | 🇺🇸 Dallas | 4,017 | 1986 |
| 74 | [Trellix](https://www.tamtam.ai/c/trellix) (trellix.com)<br>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. | Computer and Network Security | 🇺🇸 Plano | 3,827 | 2022 |
| 75 | [Integer Holdings Corporation](https://www.tamtam.ai/c/integer-holdings-corporation) (integer.net)<br>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. | Medical Equipment Manufacturing | 🇺🇸 Plano | 3,810 | 1940 |
| 76 | [SailPoint](https://www.tamtam.ai/c/sailpoint) (sailpoint.com)<br>Provides an identity security platform to manage and secure access to applications and data, defending against cyber threats and enhancing productivity for enterprises. | Software Development | 🇺🇸 Austin | 3,699 | 2005 |
| 77 | [Quest Software](https://www.tamtam.ai/c/quest-software) (quest.com)<br>Provides software solutions for data management, cybersecurity, and platform modernization, enabling organizations to build trusted foundations for AI success with speed and confidence. | Software Development | 🇺🇸 Austin | 3,567 |  |
| 78 | [Lamar University](https://www.tamtam.ai/c/lamar-university) (lamar.edu)<br>A member of The Texas State University System offering over 100 programs leading to bachelor's, master's, and doctoral degrees | Higher Education | 🇺🇸 Beaumont | 3,430 | 1923 |
| 79 | [Omnicell](https://www.tamtam.ai/c/omnicell) (omnicell.com)<br>Transforming pharmacy care delivery with Advanced Services for central pharmacy, IV compounding, inventory optimization, and connecting settings of care with technology | Hospitals and Health Care | 🇺🇸 Fort Worth | 3,400 | 1992 |
| 80 | [o9 Solutions, Inc.](https://www.tamtam.ai/c/o9-solutions-inc) (o9solutions.com)<br>The company specializes in providing faster, more intelligent planning and business decision-making solutions to help enterprises achieve their goals while using fewer resources | Software Development | 🇺🇸 Dallas | 3,278 | 2009 |
| 81 | [Hilti North America](https://www.tamtam.ai/c/hilti-north-america) (hilti.com)<br>Providing innovative tools, fasteners, software, and services to enhance construction speed, safety, and sustainability for professionals. | Construction | 🇺🇸 Plano | 3,241 | 1941 |
| 82 | [Dover Fueling Solutions](https://www.tamtam.ai/c/dover-fueling-solutions) (doverfuelingsolutions.com)<br>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 | Automation Machinery Manufacturing | 🇺🇸 Austin | 3,193 | 2016 |
| 83 | [Southwest Research Institute](https://www.tamtam.ai/c/southwest-research-institute) (swri.org)<br>Independent nonprofit organization specializing in creating and transferring technology in engineering and physical sciences, with laboratories and facilities across multiple locations. | Research Services | 🇺🇸 San Antonio | 3,135 | 1947 |
| 84 | [Tokyo Electron US](https://www.tamtam.ai/c/tokyo-electron-us) (tel.com)<br>Engineering, manufacturing, selling, and servicing wafer-processing, flat panel display, and thin-film silicon photovoltaic equipment worldwide. | Semiconductor Manufacturing | 🇺🇸 Austin | 3,086 | 1963 |
| 85 | [HKS, Inc.](https://www.tamtam.ai/c/hks-inc) (hksinc.com)<br>A global architecture and design firm with a focus on sustainability, creativity, and delivering elegant solutions for clients and collaborators | Architecture and Planning | 🇺🇸 Dallas | 2,916 | 1939 |
| 86 | [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 |
| 87 | [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 |
| 88 | [SolarWinds](https://www.tamtam.ai/c/solarwinds) (solarwinds.com)<br>Simplifying IT services to make operations run smoothly and effortlessly | Software Development | 🇺🇸 Austin | 2,856 | 1999 |
| 89 | [East Texas A&M University](https://www.tamtam.ai/c/east-texas-a-and-m-university) (tamuc.edu)<br>A university focused on individual success, providing support, personalized education, and opportunities for growth, preparing students for the marketplace | Higher Education | 🇺🇸 Commerce | 2,692 | 1889 |
| 90 | [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 |
| 91 | [Silicon Labs](https://www.tamtam.ai/c/silicon-labs) (silabs.com)<br>A company specializing in secure, intelligent wireless technology to create a more connected world | Semiconductor Manufacturing | 🇺🇸 Austin | 2,579 | 1996 |
| 92 | [ALKEGEN](https://www.tamtam.ai/c/alkegen) (alkegen.com)<br>Specialty materials leader for mission-critical systems in battery technologies, electric vehicles, filtration media, and insulation materials to promote sustainability and energy savings | Industrial Machinery Manufacturing | 🇺🇸 Irving | 2,527 |  |
| 93 | [Helen of Troy](https://www.tamtam.ai/c/helen-of-troy) (careers.helenoftroy.com)<br>This company provides products found in homes improving everyday life, with a focus on inclusion and empowerment of talent | Manufacturing | 🇺🇸 El Paso | 2,416 | 1968 |
| 94 | [DJO](https://www.tamtam.ai/c/djo) (enovis.com)<br>Enovis, formerly DJO, specializes in medical technology, offering products for performance, mobility, surgical intervention, and post-operative rehabilitation through various brands. | Medical Equipment Manufacturing | 🇺🇸 Dallas | 2,241 | 1978 |
| 95 | [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 |  |
| 96 | [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 |  |
| 97 | [Mitratech](https://www.tamtam.ai/c/mitratech) (mitratech.com)<br>It provides technology solutions for corporate legal, risk, compliance, and HR professionals to enhance productivity, control expenses, and mitigate risks. | Software Development | 🇺🇸 Bee Cave | 2,094 |  |
| 98 | [Textron Systems](https://www.tamtam.ai/c/textron-systems) (textronsystems.com)<br>Innovative solutions provider to defense, homeland security, and aerospace sectors Specializing in unmanned aircraft, marine craft, armored vehicles, and intelligence software | Defense and Space Manufacturing | 🇺🇸 Haslet | 2,084 |  |
| 99 | [Vistance Networks](https://www.tamtam.ai/c/vistance-networks) (vistancenetworks.com)<br>Provides reliable communication technology solutions focused on performance, innovation, and customer-driven value for a dynamic global market. | Telecommunications | 🇺🇸 Richardson | 2,068 |  |
| 100 | [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 |

## 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

- [The largest companies in Texas](https://www.tamtam.ai/l/largest-companies-texas) (9,277)
- [Multinational companies in Texas](https://www.tamtam.ai/l/multinational-companies-texas) (1,418)
- [Oil and Gas companies in Texas](https://www.tamtam.ai/l/oil-and-gas-companies-texas) (969)
- [Energy companies in Texas](https://www.tamtam.ai/l/energy-companies-texas) (857)
- [IT Services and IT Consulting companies in Texas](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-texas) (834)
- [IT services companies in Texas](https://www.tamtam.ai/l/it-services-companies-texas) (729)
- [Retail chains in Texas](https://www.tamtam.ai/l/retail-chains-texas) (633)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Manufacturers in Texas](https://www.tamtam.ai/l/manufacturers-texas) (621)
- [Critical infrastructure operators in Texas](https://www.tamtam.ai/l/critical-infrastructure-operators-texas) (579)
- [Real Estate companies in Texas](https://www.tamtam.ai/l/real-estate-companies-texas) (563)
- [Education providers in Texas](https://www.tamtam.ai/l/education-companies-texas) (533)
- [SaaS companies in Texas](https://www.tamtam.ai/l/saas-companies-texas) (498)
- [Consulting firms in Texas](https://www.tamtam.ai/l/consulting-firms-texas) (453)
- [Hardware manufacturers in Texas](https://www.tamtam.ai/l/hardware-companies-texas) (426)
- [Hospitals and Health Care companies in Texas](https://www.tamtam.ai/l/hospitals-and-health-care-companies-texas) (423)
- [Software Development companies in Texas](https://www.tamtam.ai/l/software-development-companies-texas) (414)
- [Financial services firms in Texas](https://www.tamtam.ai/l/financial-services-firms-texas) (410)
- [Healthcare providers in Texas](https://www.tamtam.ai/l/healthcare-providers-texas) (408)
- [Transportation, Logistics, Supply Chain and Storage companies in Texas](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-texas) (375)
- [Companies with a mobile app in Texas](https://www.tamtam.ai/l/companies-with-mobile-app-texas) (366)
- [Public sector organisations in Texas](https://www.tamtam.ai/l/public-sector-organisations-texas) (360)
- [AI companies in Texas](https://www.tamtam.ai/l/ai-companies-texas) (351)
- [Logistics companies in Texas](https://www.tamtam.ai/l/logistics-companies-texas) (334)

## The same list elsewhere in United States

- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,276)
- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (419)
- [Companies with in-house R&D in Massachusetts](https://www.tamtam.ai/l/r-and-d-companies-massachusetts) (396)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Companies with in-house R&D in Michigan](https://www.tamtam.ai/l/r-and-d-companies-michigan) (287)
- [Companies with in-house R&D in Ohio](https://www.tamtam.ai/l/r-and-d-companies-ohio) (277)
- [Companies with in-house R&D in Pennsylvania](https://www.tamtam.ai/l/r-and-d-companies-pennsylvania) (255)
- [Companies with in-house R&D in New Jersey](https://www.tamtam.ai/l/r-and-d-companies-new-jersey) (224)
- [Companies with in-house R&D in Florida](https://www.tamtam.ai/l/r-and-d-companies-florida) (221)
- [Companies with in-house R&D in Alabama](https://www.tamtam.ai/l/r-and-d-companies-alabama) (214)
- [Companies with in-house R&D in Georgia](https://www.tamtam.ai/l/r-and-d-companies-georgia) (173)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Companies with in-house R&D in North Carolina](https://www.tamtam.ai/l/r-and-d-companies-north-carolina) (158)
- [Companies with in-house R&D in Wisconsin](https://www.tamtam.ai/l/r-and-d-companies-wisconsin) (154)
- [Companies with in-house R&D in Minnesota](https://www.tamtam.ai/l/r-and-d-companies-minnesota) (146)
- [Companies with in-house R&D in Washington State](https://www.tamtam.ai/l/r-and-d-companies-washington-state) (140)
- [Companies with in-house R&D in Colorado](https://www.tamtam.ai/l/r-and-d-companies-colorado) (113)
- [Companies with in-house R&D in Maryland](https://www.tamtam.ai/l/r-and-d-companies-maryland) (107)
- [Companies with in-house R&D in Indiana](https://www.tamtam.ai/l/r-and-d-companies-indiana) (104)
- [Companies with in-house R&D in New York](https://www.tamtam.ai/l/r-and-d-companies-new-york) (223)
- [Companies with in-house R&D in San Francisco](https://www.tamtam.ai/l/r-and-d-companies-san-francisco) (147)
- [Companies with in-house R&D in Houston](https://www.tamtam.ai/l/r-and-d-companies-houston) (129)
- [Companies with in-house R&D in San Jose](https://www.tamtam.ai/l/r-and-d-companies-san-jose) (103)

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