This selection of professional services firms in Colorado consists predominantly of mid-sized to large companies, with a strong presence in civil engineering, IT services, and legal practice. Notable firms include CH2M, a global infrastructure and natural resource problem solver, and Atlas, which provides professional testing, inspection, and engineering services. Tek Experts offers digital transformation solutions, while Optiv focuses on cybersecurity programs. Holland & Hart LLP is a law firm in the Mountain West region, and Merrick & Company provides engineering, architecture, and geospatial solutions.
A significant pattern observed is the concentration of headquarters in Denver, which hosts multiple legal firms such as Holland & Hart LLP, Bryan Cave LLP, and Brownstein Hyatt Farber Schreck, as well as architecture firms like Independent Architecture and VA+. This suggests a central hub for professional services within the state.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
CH2Mjacobs.com
global infrastructure and natural resource problems solver, creating new pathways for human progress. Engineering for governments, cities, and businesses. |
7,008 | |||
| 2 |
Atlasoneatlas.com
A nationwide provider of professional testing, inspection, engineering, environmental, and consulting services for public and private sector clients in various markets |
4,185 | |||
| 3 |
Tek Expertsteknowledge.com
Global digital transformation company providing enterprise technical managed services, technical skilling, and cybersecurity solutions with a focus on exceptional customer experiences |
2,617 | |||
| 4 | 2,224 | ||||
| 5 |
MWH, now part of Stantec
This company is no longer active on LinkedIn Visit their new page to learn more about their services |
2,022 | |||
| 6 |
Holland & Hart LLPhollandhart.com
A law firm in the Mountain West region offering legal services with a focus on diversity, equity, and inclusion, and fostering alumni relationships |
1,245 | |||
| 7 |
Merrick & Companymerrick.com
Employee-owned professional firm providing engineering, architecture, surveying, and geospatial solutions to clients in energy, national security, life sciences, and infrastructure markets Offering corporate responsibility programs |
1,162 | |||
| 8 |
Bryan Cave LLPbclplaw.com
International legal practice providing a wide range of legal services to diverse clients, including multinational corporations, privately held companies, and emerging businesses |
943 | |||
| 9 |
Independent Architectureindependentarchitecture.com
Denver-based architecture office blending design with pop culture Specializing in unique projects like small building for Chicago Architecture Biennial and steel barn kit house |
936 | |||
| 10 |
Datavaildatavail.com
It offers technology consulting, implementation, and managed services, focusing on database management, analytics, application development, and cloud infrastructure solutions. |
898 | |||
| 11 |
Colorado State Public Defendercoloradodefenders.us
Providing zealous and effective legal representation for indigent individuals facing criminal charges in Colorado, upholding their right to counsel |
896 | |||
| 12 |
Brownstein Hyatt Farber Schreckbhfs.com
A multidisciplinary team of lawyers, policy experts, and business professionals solving tough challenges at the intersection of law, business, and policy |
895 | |||
| 13 |
VA+vertical-arts.com
A Denver-based team of BIM professionals collaborates with architects and engineers globally to enhance BIM workflows and outcomes for successful design projects |
847 | |||
| 14 |
Gov-Con Solutionsgov-con.com
Specializing in financial and accounting solutions for government contractors, we assist with systems, rates, proposals, budgets, projections, and audits nationwide |
843 | |||
| 15 |
Eberl Claims Serviceeberls.com
A people-centric organization leveraging technology and compassion to provide comprehensive insurance claims management solutions, from loss adjusting to repair management |
781 | |||
| 16 |
PDSpdsinc.com
Leading IT and engineering consulting firm in the Western US, delivering award-winning solutions and resources across technology, engineering, financial, and human capital management divisions |
766 | |||
| 17 |
ME Engineersme-engineers.com
Specializing in innovative MEPT systems, this company designs sports venues, commercial developments, educational buildings, and healthcare facilities with a focus on sustainability and efficiency |
746 | |||
| 18 |
Pinionpinionglobal.com
A global leader in food and agriculture consulting and business advisory, providing specialized services in sustainability, government affairs, financial management, and more |
711 | |||
| 19 | 655 | ||||
| 20 |
Integra Realty Resourcesirr.com
A leading provider of commercial real estate valuation, counseling, and advisory services nationwide, bringing expertise and local market insight to clients |
635 | |||
| 21 |
Clinic Service Corporationclinicservice.com
Medical billing specialist offering practice management solutions including EMR system implementation, business plan development, and managed care contracting for private medical practices |
567 | |||
| 22 |
SAFEbuiltsafebuilt.com
Providing expertise in community development services with a focus on integrity, improvement, service, teamwork, and respect, driving safe and thriving communities |
566 | |||
| 23 |
Prosciprosci.com
Helps organizations manage change through a proven methodology, research, and results-focused training and consulting, ensuring successful transitions for clients globally. |
557 | |||
| 24 |
SPARTAdomaineasy.com
A provider of technical products and services to US government sectors, specializing in critical analysis, computer science solutions, network architecture, and acquisition support |
543 | |||
| 25 |
Design Workshopdesignworkshop.com
A global design studio specializing in landscape architecture, urban design, planning, and environmental graphic design, committed to sustainability and community connections |
520 | |||
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. | |||||
| 26 | 509 | ||||
| 27 |
Gorilla Logicgorillalogic.com
A leading tech partner delivering innovative digital products and platforms, with deep expertise, collaborative Agile teams, and a focus on client success |
505 | |||
| 28 |
Apogeeapogeeusa.com
A small business known for client success, a family-like work environment, and providing innovative solutions with dedication to professional support |
504 | |||
| 29 |
Project Resources Group, Inc.prgus.com
Leading provider of construction management and outside plant damage investigation and recovery services for telecommunication and utility industries since 2001 |
494 | |||
| 30 |
SalesHivesaleshive.com
It specializes in B2B lead generation through cold calling, email, and LinkedIn, utilizing a proprietary outreach platform and CRM. |
438 | |||
| 31 |
Campos EPCcamposepc.com
A Denver-based EPC company specializing in services for utility, energy, and midstream organizations with a focus on diversity and talent development |
429 | |||
| 32 |
Lerch Bates Inc.lerchbates.com
Global technical consultancy specializing in building design, modernization, investigation, and management, offering services for vertical transportation, logistics, enclosures, facades, and building lifecycle optimization |
426 | |||
| 33 |
Briotix Healthbriotix.com
Briotix Health specializes in musculoskeletal injury prevention, office ergonomics, and customized solutions for workforce health, utilizing technology and coaching |
425 | |||
| 34 |
MCA Connectmcaconnect.com
The company specializes in providing manufacturing industry expertise, strategic solutions, digital transformation, and Microsoft Cloud services to help manufacturers succeed globally |
420 | |||
| 35 |
Aventiaaventiaenv.com
A leading environmental consulting firm providing innovative and sustainable solutions for various environmental challenges through its platform of subsidiary companies |
419 | |||
| 36 |
Martin/Martin, Incmartinmartin.com
A full-service civil and structural engineering firm with multiple offices nationwide, providing quality services to various clients including municipalities, architects, and developers |
406 | |||
| 37 |
Elementselementsofplace.com
This company focuses on placemaking by understanding people's needs to create inspiring environments through design, consulting, furnishings, and construction services |
403 | |||
| 38 |
EnergyScape Renewablesenergyscaperenewables.com
A leading provider of comprehensive Solar CAD Designs and Engineering services to US developers and EPC's worldwide, ensuring fast regulatory approval |
391 | |||
| 39 |
JR Engineeringjrengineering.com
Established in 1973, this Colorado-based company offers a wide range of engineering services, including land development, surveying, transportation, water resources, and structural engineering, as well as construction services |
387 | |||
| 40 |
Galloway & Company, LLCgallowayus.com
A multidisciplinary firm in architecture, engineering, and survey services, providing full support for development projects with a collaborative, client-focused approach |
378 | |||
| 41 |
NEI Electric Power Engineering, Inc.neiengineering.com
NEI provides professional power system engineering services, specializing in renewables, substation design, transmission, distribution, and construction management with experienced engineers |
355 | |||
| 42 |
Apex ITapexit.com
A technology consulting firm providing enterprise solutions like Oracle and Salesforce, specializing in CRM, HCM, financial reporting, and Business Intelligence |
345 | |||
| 43 |
Xclusive Servicesxclusivestaffing.com
Custom staffing solutions tailored to clients' needs, recruiting skilled and motivated staff to help achieve business objectives |
345 | |||
| 44 |
IntelliSourceintellisource.com
Innovative outsourcing company specializing in solving business challenges through customizable solutions in BPO, RPO, and Total Talent Management |
343 | |||
| 45 |
The Proof Positive Group: MS Word Expert & PowerPoint Expert | Templates | Formatting | RFP | PC/Macmswordpowerpointexpert.com
Specializing in expert Microsoft Office support services for document needs, including template development, document formatting, PDF merges, and more for PC and Mac users |
343 | |||
| 46 |
Richey Mayricheymay.com
Specializing in alternative investments and mortgage banking industries, offering Audit, Assurance, Tax services, and advisory solutions to propel clients' growth with industry recognition for excellence |
327 | |||
| 47 |
MRC Recruitingmrcrecruiting.com
A family-run recruitment firm specializing in providing high-potential candidates for resource companies worldwide, with a focus on communication, budget-friendly fees, and proven hiring processes |
326 | |||
| 48 |
Sanbornsanborn.com
A leader in geospatial solutions, specializing in aerial imaging, LiDAR mapping, 3D modeling, indoor mapping, and software products for global customers |
316 | |||
| 49 |
RMG Engineersrmg-engineers.com
RMG Engineers and Architects offers a wide range of engineering and architectural services in Colorado, focusing on client needs and delivering successful outcomes |
308 | |||
| 50 |
The Premier Groupthepremiergroupus.com
An executive search and placement firm providing supplemental skilled manpower to general contractors and sub contractors for commercial and industrial construction projects nationwide |
273 | |||
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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 Colorado
- The largest companies in Colorado 2,042
- Multinational companies in Colorado 228
- Retail chains in Colorado 178
- Manufacturers in Colorado 147
- SaaS companies in Colorado 145
- Critical infrastructure operators in Colorado 137
- Healthcare providers in Colorado 126
- Education providers in Colorado 122
- Hospitals and Health Care companies in Colorado 115
- Energy companies in Colorado 113
- Companies with in-house R&D in Colorado 113
- Subscription businesses in Colorado 108
- Software Development companies in Colorado 105
- Hardware manufacturers in Colorado 103
- Financial services firms in Colorado 100
- Companies with a mobile app in Colorado 100
- IT Services and IT Consulting companies in Colorado 99
- Construction companies in Colorado 93
- Hotel and hospitality groups in Colorado 86
- Real Estate companies in Colorado 83
- Public sector organisations in Colorado 80
- Financial Services companies in Colorado 78
- IT services companies in Colorado 78
- Consulting firms in Colorado 77
The same list elsewhere in United States
- Professional services firms in the United States 7,078
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 629
- Professional services firms in Florida 375
- Professional services firms in Virginia 344
- Professional services firms in Illinois 339
- Professional services firms in Massachusetts 249
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 172
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 135
- Professional services firms in Minnesota 125
- Professional services firms in New York 735
- Professional services firms in Chicago 196
- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Washington 109