# Top 30 corporate groups and holding companies in Houston
Tamtam tracks 74 corporate groups and holding companies headquartered in Houston. This list ranks the 30 largest by number of employees on LinkedIn, led by NRG Energy, Tailored Brands, Inc. and Westlake. Their median headcount is 1,420. Half of them were founded in 1987 or later.
These Houston-based companies are predominantly large corporate groups, many of which operate internationally. They represent a mix of sectors, including energy, manufacturing, and services. Notable examples include NRG Energy, providing natural gas and electricity solutions, and Tailored Brands, Inc., focused on retail apparel. Westlake manufactures petrochemicals and building products globally, while Noble Corporation is an offshore drilling contractor. Quanta Services, Inc. offers integrated solutions for electric power and pipeline industries, and Corebridge Financial provides retirement and insurance products.
A significant pattern observed among these companies is their strong presence in the energy sector, particularly oil and gas, with several firms like Noble Corporation, Helix Energy Solutions Group, and Parker Wellbore specializing in offshore drilling and energy services. Additionally, there is a notable cluster of companies in the construction and building materials industries, such as Quanta Services, IES Holdings, Comfort Systems USA, and Quanex.
๐บ๐ธ Houston ยท 30 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [NRG Energy](https://www.tamtam.ai/c/nrg-energy) (nrg.com)
Provides innovative natural gas, electricity, and smart home energy solutions to a diverse range of customers across North America. | Consumer Services | ๐บ๐ธ Houston | 16,171 | 1989 |
| 2 | [Tailored Brands, Inc.](https://www.tamtam.ai/c/tailored-brands-inc) (tailoredbrands.com)
Company focuses on enhancing customer appearance and confidence for important moments, emphasizing inclusivity, integrity, teamwork, and continuous improvement. | Retail Apparel and Fashion | ๐บ๐ธ Houston | 11,474 | |
| 3 | [Westlake](https://www.tamtam.ai/c/westlake) (westlake.com)
Manufacturing and supplying petrochemicals, plastics, and building products globally, enhancing daily life through quality products and services. | Chemical Manufacturing | ๐บ๐ธ Houston | 6,574 | 1986 |
| 4 | [Noble Corporation](https://www.tamtam.ai/c/noble-corporation) (noblecorp.com)
Leading offshore drilling contractor operating advanced fleet focused on ultra-deepwater and high-specification jackup drilling worldwide. | Oil and Gas | ๐บ๐ธ Houston | 6,572 | 1921 |
| 5 | [Quanta Services, Inc.](https://www.tamtam.ai/c/quanta-services-inc) (quantaservices.com)
Leading specialty contractor offering integrated solutions and skilled workforce for electric power, pipeline, industrial, and communications industries across North America. | Construction | ๐บ๐ธ Houston | 6,263 | |
| 6 | [Corebridge Financial](https://www.tamtam.ai/c/corebridge-financial) (corebridgefinancial.com)
A leading provider of retirement solutions and insurance products, empowering people to take action for a secure financial future | Financial Services | ๐บ๐ธ Houston | 5,319 | |
| 7 | [U.S. Physical Therapy, Inc.](https://www.tamtam.ai/c/u-s-physical-therapy-inc) (usph.com)
A publicly held company with hundreds of outpatient therapy clinics in 41 states, offering care for orthopedic and neurologic disorders through unique partnerships | Wellness and Fitness Services | ๐บ๐ธ Houston | 4,246 | 1990 |
| 8 | [Tidewater](https://www.tamtam.ai/c/tidewater) (tdw.com)
Global leader in offshore industry with largest OSV fleet, providing high-quality marine services, upholding safety standards, and prioritizing employees, customers, and environmental responsibility | Transportation, Logistics, Supply Chain and Storage | ๐บ๐ธ Houston | 4,121 | 1956 |
| 9 | [IES Holdings](https://www.tamtam.ai/c/ies-holdings) (ies-co.com)
Electrical contracting services for commercial, industrial, residential, and infrastructure sectors across the United States, based in Houston, Texas. | Construction | ๐บ๐ธ Houston | 2,868 | 1997 |
| 10 | [KBR Careers](https://www.tamtam.ai/c/kbr-careers) (careers.kbr.com)
Global provider of science, technology, and engineering solutions to governments and companies, delivering value-added services and operations in 33 countries | IT Services and IT Consulting | ๐บ๐ธ Houston | 2,732 | 1919 |
| 11 | [CraftWorks Restaurants & Breweries, Inc.](https://www.tamtam.ai/c/craftworks-restaurants-and-breweries-inc) (spbhospitality.com)
A leading operator and franchisor of full-service dining restaurants with a diverse portfolio including national restaurant and brewery brands | Restaurants | ๐บ๐ธ Houston | 2,729 | 2010 |
| 12 | [Helix Energy Solutions Group](https://www.tamtam.ai/c/helix-energy-solutions-group) (helixesg.com)
An international offshore energy services company based in Houston, specializing in well intervention, robotics, and decommissioning operations to support global energy transition | Oil and Gas | ๐บ๐ธ Houston | 1,952 | 1980 |
| 13 | [Parker Wellbore](https://www.tamtam.ai/c/parker-wellbore) (nabors.com)
Wellbore construction partner minimizing risk & optimizing performance Specializing in drilling, rig operations, rental tools, and supporting customers in energy transition | Oil and Gas | ๐บ๐ธ Houston | 1,622 | 1934 |
| 14 | [Comfort Systems USA](https://www.tamtam.ai/c/comfort-systems-usa) (comfortsystemsusa.com)
National HVAC company with 30 years of experience offering complete HVAC services for a wide range of buildings, from schools to high-rises and industrial plants | Construction | ๐บ๐ธ Houston | 1,497 | 1997 |
| 15 | [Quanex](https://www.tamtam.ai/c/quanex) (quanex.com)
A global manufacturing company focused on innovation, efficiency, community impact, shareholder value, and employee development in various markets worldwide | Wholesale Building Materials | ๐บ๐ธ Houston | 1,420 | 1927 |
| 16 | [ORION](https://www.tamtam.ai/c/orion-houston) (oriongroupholdingsinc.com)
Specializing in marine, concrete, and engineering services, providing construction solutions across the United States, Canada, and the Caribbean with predictable excellence | Construction | ๐บ๐ธ Houston | 1,136 | 1994 |
| 17 | [Boardwalk Pipelines](https://www.tamtam.ai/c/boardwalk-pipelines) (bwpipelines.com)
A midstream natural gas and NGLs company providing transportation, storage, and customer service with over 14,000 miles of pipelines and underground storage caverns | Oil and Gas | ๐บ๐ธ Houston | 1,116 | |
| 18 | [HILONG GROUP OF COMPANIES](https://www.tamtam.ai/c/hilong-group-of-companies) (hilonggroup.com)
Specializing in oil and natural gas industries, this group of enterprises has subsidiaries with production bases in multiple locations worldwide | Oil and Gas | ๐บ๐ธ Houston | 1,115 | |
| 19 | [DCCM](https://www.tamtam.ai/c/dccm) (dccm.com)
DCCM provides design, consulting, and construction management services for infrastructure markets through a family of complementary brand companies across the United States | Civil Engineering | ๐บ๐ธ Houston | 1,013 | 2020 |
| 20 | [Lexitas](https://www.tamtam.ai/c/lexitas) (lexitaslegal.com)
Provider of professional services and technology solutions for legal, insurance, and corporate sectors, ensuring accuracy, timeliness, and reliability for vital outcomes | Legal Services | ๐บ๐ธ Houston | 890 | 1987 |
| 21 | [Bredero Shaw](https://www.tamtam.ai/c/bredero-shaw) (tenaris.com)
The company is rebranding to Shawcor and specializes in providing updates and news regarding their transition and evolving brand | Oil and Gas | ๐บ๐ธ Houston | 871 | |
| 22 | [Par Pacific Holdings, Inc.](https://www.tamtam.ai/c/par-pacific-holdings-inc) (parpacific.com)
An energy company based in Houston, focusing on renewable and conventional fuels, with refining, logistics, and retail operations in the Western United States | Oil and Gas | ๐บ๐ธ Houston | 780 | |
| 23 | [TNT Crane & Rigging, Inc.](https://www.tamtam.ai/c/tnt-crane-and-rigging-inc) (tntcrane.com)
A leading crane service provider in North America, offering safe and specialized lifting solutions for various industries with a modern fleet of 700+ cranes | Commercial and Industrial Equipment Rental | ๐บ๐ธ Houston | 777 | |
| 24 | [Piping Technology & Products, Inc.](https://www.tamtam.ai/c/piping-technology-and-products-inc) (pipingtech.com)
Manufacture high-quality engineered pipe supports including hangers, expansion joints, pre-insulated supports, custom designs, and emergency solutions for various industries. | Oil and Gas | ๐บ๐ธ Houston | 727 | 1975 |
| 25 | [Worldwide Oilfield Machine](https://www.tamtam.ai/c/worldwide-oilfield-machine) (womgroup.com)
Multinational equipment manufacturer specializing in solutions for drilling, testing, production, and intervention operations in various environments globally with a diverse workforce | Oil and Gas | ๐บ๐ธ Houston | 668 | 1980 |
| 26 | [Carriage Services](https://www.tamtam.ai/c/carriage-services) (carriageservices.com)
A leading provider of professional funeral and cemetery services in the United States, committed to high quality, ethics, and client care nationwide | Individual and Family Services | ๐บ๐ธ Houston | 666 | 1991 |
| 27 | [TMK IPSCO](https://www.tamtam.ai/c/tmk-ipsco) (tenaris.com)
Specializing in oil and gas technologies, the company contributes to the industry through its integration with Tenaris | Oil and Gas | ๐บ๐ธ Houston | 601 | 1956 |
| 28 | [Saber Power](https://www.tamtam.ai/c/saber-power) (saberpower.com)
Engineering-led professional services company specializing in medium and high voltage electrical infrastructure Offering turnkey EPC, construction, maintenance, emergency response, training, and engineering services globally | Engineering Services | ๐บ๐ธ Houston | 597 | 2010 |
| 29 | [Nova Medical Centers](https://www.tamtam.ai/c/nova-medical-centers) (concentra.com)
Occupational healthcare provider offering drug testing, physicals, work-injury care, and physical therapy for on-the-job injuries to exceed patient and client expectations | Hospitals and Health Care | ๐บ๐ธ Houston | 588 | 1992 |
| 30 | [Meriplex](https://www.tamtam.ai/c/meriplex) (meriplex.com)
A provider of managed technology solutions specializing in Intelligent WAN, Cybersecurity, Physical Security, Cloud, and Voice services for enabling business transformation and growth | IT Services and IT Consulting | ๐บ๐ธ Houston | 587 | |
## 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/holding-companies-houston