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30 leading professional services firms in Houston

Tamtam tracks 156 professional services firms headquartered in Houston. This list ranks the 30 largest by number of employees on LinkedIn, led by Halliburton, KBR, Inc. and Asset Living. Their median headcount is 1,680. Half of them were founded in 1978 or later.

馃嚭馃嚫 Houston30 companiesUpdated Nov 11, 2026

These professional services firms in Houston are mostly large and mid-sized companies. Key industries include oil and gas, with Halliburton engineering solutions for energy asset value and Superior Energy Services offering oilfield products. IT services are also prominent, with KBR, Inc. providing science, technology, and engineering solutions, and KBR Careers delivering value-added services globally. Real estate is represented by Asset Living, a third-party management firm, and Transwestern, which delivers personalized services.

The data shows a strong concentration in the energy sector, reflecting Houston's role as a global energy hub. Companies like S&B, an engineer and constructor for industrial facilities, and CDI Engineering Solutions, specializing in project planning for energy and chemicals, highlight this focus. Another common theme is the provision of specialized expertise, such as Weaver's accounting services and Vinson & Elkins' legal counsel.

#CompanyIndustryHeadquarters EmployeesFounded
1
Halliburtonhalliburton.com

Collaborates to engineer solutions maximizing energy asset value, from locating hydrocarbons, managing data, drilling, evaluating, and constructing wells, to optimizing production.

Oil and Gas 馃嚭馃嚫 Houston 60,277 1919
2
KBR, Inc.kbr.com

Providing science, technology, and engineering solutions to governments and companies worldwide addressing significant contemporary challenges and opportunities.

IT Services and IT Consulting 馃嚭馃嚫 Houston 31,433 n/a
3
Asset Livingassetliving.com

A third-party management firm specializing in diverse real estate properties across the US, driving innovation and results for clients and communities

Real Estate 馃嚭馃嚫 Houston 5,216 1986
4
S&Bsbec.com

A leading engineer and constructor for large industrial facilities, providing certainty, expertise, and commitment to deliver purpose-built solutions for clients worldwide

Oil and Gas 馃嚭馃嚫 Houston 4,293 1967
5
Superior Energy Servicessuperiorenergy.com

A global oilfield products and services company offering rental, well servicing, engineered solutions, and expert consultative services for oil & gas exploration and production companies worldwide

Oil and Gas 馃嚭馃嚫 Houston 2,946 n/a
6
Transwesterntranswestern.com

Privately held real estate company delivering personalized services, innovative solutions, and driving value for clients globally through strategic alliances

Real Estate 馃嚭馃嚫 Houston 2,833 1978
7
KBR Careerscareers.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 馃嚭馃嚫 Houston 2,732 1919
8
Key Energy Serviceskeyenergy.com

Key Energy Services, headquartered in Houston, provides energy production solutions and services to E&P companies, optimizing well production for long-term success

Oil and Gas 馃嚭馃嚫 Houston 2,669 1977
9
CDI Engineering Solutionstataconsultingengineers.com

Engineering services provider for energy, chemicals, and infrastructure sectors Specializing in project planning, design, commissioning, and construction management for successful outcomes

Services for Renewable Energy 馃嚭馃嚫 Houston 2,633 1950
10
Airswiftairswift.com

Supporting STEM professionals in technology and engineering with job placement services, boasting unrivaled talent pool and global presence in 60 offices

Staffing and Recruiting 馃嚭馃嚫 Houston 2,223 n/a
11
Weaverweaver.com

A Houston-based firm providing top accounting services, including assurance, tax, risk advisory, IT advisory, energy compliance, consulting, and specialty tax services

Accounting 馃嚭馃嚫 Houston 2,105 1950
12
Vinson & Elkinsconnect.velaw.com

providing expert legal counsel and innovative solutions to leading companies across various industries, focusing on complex matters and client trust

Law Practice 馃嚭馃嚫 Houston 1,786 1917
13
PSCjd3consultingllc.com

Consulting business offering expertise in engineering, sales, and business development, particularly in mergers and acquisitions (M&A)

Oil and Gas 馃嚭馃嚫 Houston 1,713 2021
14
CAMScamstex.com

Provides disciplined asset management and operations services, maximizing clients' value through operational performance, commercial optimization, and financial controls A reputation for creativity and flexibility

Utilities 馃嚭馃嚫 Houston 1,712 2007
15
Audubon Companiesauduboncompanies.com

A leading provider of EPC, consulting, fabrication, and technical services for energy, chemicals, power, infrastructure, and industrial markets with a focus on sustainability

Engineering Services 馃嚭馃嚫 Houston 1,680 1997

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16
Baker Bottsbakerbotts.com

Global law firm specializing in energy, technology, and life sciences sectors, providing creative legal solutions and demonstrating commitment to excellence since 1840

Law Practice 馃嚭馃嚫 Houston 1,633 1840
17
Radix - Globalradixeng.com

A global technology solutions company offering innovative industrial solutions to drive transformation, operational excellence, and sustainable value worldwide

IT Services and IT Consulting 馃嚭馃嚫 Houston 1,619 n/a
18
Searce Incsearce.com

A company focused on refining, analyzing, and improving to deliver intelligent, impactful, and futuristic business outcomes through passionate employees

Business Consulting and Services 馃嚭馃嚫 Houston 1,587 2004
19
AIS Infoaisinfo.com

The company automates processes, improves compliance, and provides cost-effective labor solutions across industries, enabling clients to focus on growth and make data-driven decisions

Financial Services 馃嚭馃嚫 Houston 1,509 2000
20
PBKpbk.com

A leading architecture, engineering, and consulting practice specializing in design solutions for education, healthcare, corporate, government, and sports/events sectors since 1981

Architecture and Planning 馃嚭馃嚫 Houston 1,366 n/a
21
Frank's International N.V.expro.com

Enables customers to make better-informed decisions through data and digital transformation, addressing energy challenges with innovative technology across well construction and production.

Oil and Gas 馃嚭馃嚫 Houston 1,340 n/a
22
Walter P Moorewalterpmoore.com

A team of engineers and innovators designing high-performance structures and infrastructure globally, providing cost-efficient solutions that shape communities worldwide

Engineering Services 馃嚭馃嚫 Houston 1,340 1931
23
alliantgroupalliantglobal.com

A premier consulting and management engineering firm, using science-based methods and a team of 2,000 professionals to deliver solutions for businesses worldwide

Business Consulting and Services 馃嚭馃嚫 Houston 1,325 2002
24
Servicios Contablessccalop.com

Servicios Contables provides executive office services, specializing in accounting, located in Houston, Texas

Accounting 馃嚭馃嚫 Houston 1,314 n/a
25
BGE, Inc.bgeinc.com

A consulting firm offering engineering, environmental, surveying, construction management, and planning services for public and private clients nationwide Visit bgeinccom for more information

Civil Engineering 馃嚭馃嚫 Houston 1,313 1975
26
Rimkusrimkus.com

Global leader in engineering & technical consulting, offering services to various industries worldwide with a focus on resolving accidents, claims, legal disputes, and complex risks

Business Consulting and Services 馃嚭馃嚫 Houston 1,265 1983
27
Selfculbertsonresources.com

Specializing in recruiting for IT, finance, energy, clerical/admin, and industrial sectors Placements range from executives to staff, offering various employment arrangements

Staffing and Recruiting 馃嚭馃嚫 Houston 1,242 2002
28
Gulf Companiesgulfcompanies.com

A leading provider of engineering and technical services in the global energy industry, focusing on safe, sustainable solutions and client success

Oil and Gas 馃嚭馃嚫 Houston 1,218 1953
29
Camin Cargo Control Inc.camincargo.com

This company provides inspection, laboratory testing, and additive treatment solutions to the Petroleum Industry with a focus on quality and customer satisfaction

Oil and Gas 馃嚭馃嚫 Houston 1,215 1982
30
Primary Servicesprimaryservices.com

Connects accounting, IT, HR, marketing, and administrative professionals with contract, temp-to-perm, and direct-hire positions at Fortune 500 clients in Texas and Oklahoma.

Staffing and Recruiting 馃嚭馃嚫 Houston 1,215 1988

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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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