# Professional services firms headquartered in Colorado

Tamtam tracks 106 professional services firms headquartered in Colorado. This list ranks the 50 largest by number of employees on LinkedIn, led by CH2M, Atlas and Tek Experts. Their median headcount is 520. Half of them were founded in 1994 or later. The most common headquarters are Denver (23), Colorado Springs (5) and Lakewood (4).

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.

🇺🇸 Colorado · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CH2M](https://www.tamtam.ai/c/ch2m) (jacobs.com)<br>global infrastructure and natural resource problems solver, creating new pathways for human progress. Engineering for governments, cities, and businesses. | Civil Engineering | 🇺🇸 Englewood | 7,008 | 1946 |
| 2 | [Atlas](https://www.tamtam.ai/c/atlas) (oneatlas.com)<br>A nationwide provider of professional testing, inspection, engineering, environmental, and consulting services for public and private sector clients in various markets | Civil Engineering | 🇺🇸 Denver | 4,185 |  |
| 3 | [Tek Experts](https://www.tamtam.ai/c/tek-experts) (teknowledge.com)<br>Global digital transformation company providing enterprise technical managed services, technical skilling, and cybersecurity solutions with a focus on exceptional customer experiences | IT Services and IT Consulting | 🇺🇸 Colorado Springs | 2,617 | 2010 |
| 4 | [Optiv](https://www.tamtam.ai/c/optiv) (optiv.com)<br>Provides cyber advisory, deploys and operates cybersecurity programs including strategy, managed security services, risk, integration and technology solutions for nearly 6,000 companies. | Computer and Network Security | 🇺🇸 Denver | 2,224 | 2015 |
| 5 | [MWH, now part of Stantec](https://www.tamtam.ai/c/mwh-now-part-of-stantec)<br>This company is no longer active on LinkedIn Visit their new page to learn more about their services | Civil Engineering | 🇺🇸 Broomfield | 2,022 | 1820 |
| 6 | [Holland & Hart LLP](https://www.tamtam.ai/c/holland-and-hart-llp) (hollandhart.com)<br>A law firm in the Mountain West region offering legal services with a focus on diversity, equity, and inclusion, and fostering alumni relationships | Law Practice | 🇺🇸 Denver | 1,245 | 1947 |
| 7 | [Merrick & Company](https://www.tamtam.ai/c/merrick-and-company) (merrick.com)<br>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 | Design Services | 🇺🇸 Greenwood Village | 1,162 | 1955 |
| 8 | [Bryan Cave LLP](https://www.tamtam.ai/c/bryan-cave-llp) (bclplaw.com)<br>International legal practice providing a wide range of legal services to diverse clients, including multinational corporations, privately held companies, and emerging businesses | Law Practice | 🇺🇸 Denver | 943 |  |
| 9 | [Independent Architecture](https://www.tamtam.ai/c/independent-architecture) (independentarchitecture.com)<br>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 | Architecture and Planning | 🇺🇸 Denver | 936 | 2009 |
| 10 | [Datavail](https://www.tamtam.ai/c/datavail) (datavail.com)<br>It offers technology consulting, implementation, and managed services, focusing on database management, analytics, application development, and cloud infrastructure solutions. | IT Services and IT Consulting | 🇺🇸 Boulder | 898 | 2007 |
| 11 | [Colorado State Public Defender](https://www.tamtam.ai/c/colorado-state-public-defender) (coloradodefenders.us)<br>Providing zealous and effective legal representation for indigent individuals facing criminal charges in Colorado, upholding their right to counsel | Legal Services | 🇺🇸 Denver | 896 | 1970 |
| 12 | [Brownstein Hyatt Farber Schreck](https://www.tamtam.ai/c/brownstein-hyatt-farber-schreck) (bhfs.com)<br>A multidisciplinary team of lawyers, policy experts, and business professionals solving tough challenges at the intersection of law, business, and policy | Law Practice | 🇺🇸 Denver | 895 | 1968 |
| 13 | [VA+](https://www.tamtam.ai/c/va) (vertical-arts.com)<br>A Denver-based team of BIM professionals collaborates with architects and engineers globally to enhance BIM workflows and outcomes for successful design projects | Architecture and Planning | 🇺🇸 Denver | 847 | 2005 |
| 14 | [Gov-Con Solutions](https://www.tamtam.ai/c/gov-con-solutions) (gov-con.com)<br>Specializing in financial and accounting solutions for government contractors, we assist with systems, rates, proposals, budgets, projections, and audits nationwide | Government Administration | 🇺🇸 Broomfield | 843 | 2004 |
| 15 | [Eberl Claims Service](https://www.tamtam.ai/c/eberl-claims-service) (eberls.com)<br>A people-centric organization leveraging technology and compassion to provide comprehensive insurance claims management solutions, from loss adjusting to repair management | Insurance | 🇺🇸 Lakewood | 781 | 1987 |
| 16 | [PDS](https://www.tamtam.ai/c/pds) (pdsinc.com)<br>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 | IT Services and IT Consulting | 🇺🇸 Centennial | 766 | 1987 |
| 17 | [ME Engineers](https://www.tamtam.ai/c/me-engineers) (me-engineers.com)<br>Specializing in innovative MEPT systems, this company designs sports venues, commercial developments, educational buildings, and healthcare facilities with a focus on sustainability and efficiency | Design Services | 🇺🇸 Golden | 746 | 1981 |
| 18 | [Pinion](https://www.tamtam.ai/c/pinion) (pinionglobal.com)<br>A global leader in food and agriculture consulting and business advisory, providing specialized services in sustainability, government affairs, financial management, and more | Accounting | 🇺🇸 Loveland | 711 | 1932 |
| 19 | [HVS](https://www.tamtam.ai/c/hvs) (hvs.com)<br>A leading consulting firm specializing in the hospitality sector, offering expertise in ownership phases, from feasibility studies to exit strategies worldwide | Hospitality | 🇺🇸 Loveland | 655 | 1980 |
| 20 | [Integra Realty Resources](https://www.tamtam.ai/c/integra-realty-resources) (irr.com)<br>A leading provider of commercial real estate valuation, counseling, and advisory services nationwide, bringing expertise and local market insight to clients | Real Estate | 🇺🇸 Denver | 635 | 1999 |
| 21 | [Clinic Service Corporation](https://www.tamtam.ai/c/clinic-service-corporation) (clinicservice.com)<br>Medical billing specialist offering practice management solutions including EMR system implementation, business plan development, and managed care contracting for private medical practices | Hospitals and Health Care | 🇺🇸 Denver | 567 | 1974 |
| 22 | [SAFEbuilt](https://www.tamtam.ai/c/safebuilt) (safebuilt.com)<br>Providing expertise in community development services with a focus on integrity, improvement, service, teamwork, and respect, driving safe and thriving communities | Government Administration | 🇺🇸 Loveland | 566 | 1992 |
| 23 | [Prosci](https://www.tamtam.ai/c/prosci) (prosci.com)<br>Helps organizations manage change through a proven methodology, research, and results-focused training and consulting, ensuring successful transitions for clients globally. | Business Consulting and Services | 🇺🇸 Fort Collins | 557 | 1994 |
| 24 | [SPARTA](https://www.tamtam.ai/c/sparta-colorado-springs) (domaineasy.com)<br>A provider of technical products and services to US government sectors, specializing in critical analysis, computer science solutions, network architecture, and acquisition support | Defense and Space Manufacturing | 🇺🇸 Colorado Springs | 543 |  |
| 25 | [Design Workshop](https://www.tamtam.ai/c/design-workshop) (designworkshop.com)<br>A global design studio specializing in landscape architecture, urban design, planning, and environmental graphic design, committed to sustainability and community connections | Architecture and Planning | 🇺🇸 Denver | 520 | 1969 |
| 26 | [WDHB](https://www.tamtam.ai/c/wdhb) (wdhb.com)<br>WDHB offers innovative experiential learning programs and advisory services for leaders worldwide, focusing on strategic discovery, leadership development, and L&D | Business Consulting and Services | 🇺🇸 Denver | 509 |  |
| 27 | [Gorilla Logic](https://www.tamtam.ai/c/gorilla-logic) (gorillalogic.com)<br>A leading tech partner delivering innovative digital products and platforms, with deep expertise, collaborative Agile teams, and a focus on client success | Software Development | 🇺🇸 Broomfield | 505 | 2002 |
| 28 | [Apogee](https://www.tamtam.ai/c/apogee) (apogeeusa.com)<br>A small business known for client success, a family-like work environment, and providing innovative solutions with dedication to professional support | Business Consulting and Services | 🇺🇸 Colorado Springs | 504 | 2004 |
| 29 | [Project Resources Group, Inc.](https://www.tamtam.ai/c/project-resources-group-inc) (prgus.com)<br>Leading provider of construction management and outside plant damage investigation and recovery services for telecommunication and utility industries since 2001 | Business Consulting and Services | 🇺🇸 Greenwood Village | 494 | 2001 |
| 30 | [SalesHive](https://www.tamtam.ai/c/saleshive) (saleshive.com)<br>It specializes in B2B lead generation through cold calling, email, and LinkedIn, utilizing a proprietary outreach platform and CRM. | Advertising Services | 🇺🇸 Denver | 438 | 2016 |
| 31 | [Campos EPC](https://www.tamtam.ai/c/campos-epc) (camposepc.com)<br>A Denver-based EPC company specializing in services for utility, energy, and midstream organizations with a focus on diversity and talent development | Utilities | 🇺🇸 Denver | 429 | 2005 |
| 32 | [Lerch Bates Inc.](https://www.tamtam.ai/c/lerch-bates-inc) (lerchbates.com)<br>Global technical consultancy specializing in building design, modernization, investigation, and management, offering services for vertical transportation, logistics, enclosures, facades, and building lifecycle optimization | Architecture and Planning | 🇺🇸 Highlands Ranch | 426 |  |
| 33 | [Briotix Health](https://www.tamtam.ai/c/briotix-health) (briotix.com)<br>Briotix Health specializes in musculoskeletal injury prevention, office ergonomics, and customized solutions for workforce health, utilizing technology and coaching | Wellness and Fitness Services | 🇺🇸 Centennial | 425 | 1997 |
| 34 | [MCA Connect](https://www.tamtam.ai/c/mca-connect) (mcaconnect.com)<br>The company specializes in providing manufacturing industry expertise, strategic solutions, digital transformation, and Microsoft Cloud services to help manufacturers succeed globally | IT Services and IT Consulting | 🇺🇸 Denver | 420 | 2002 |
| 35 | [Aventia](https://www.tamtam.ai/c/aventia) (aventiaenv.com)<br>A leading environmental consulting firm providing innovative and sustainable solutions for various environmental challenges through its platform of subsidiary companies | Environmental Services | 🇺🇸 Lakewood | 419 |  |
| 36 | [Martin/Martin, Inc](https://www.tamtam.ai/c/martin-martin-inc) (martinmartin.com)<br>A full-service civil and structural engineering firm with multiple offices nationwide, providing quality services to various clients including municipalities, architects, and developers | Engineering Services | 🇺🇸 Lakewood | 406 | 1988 |
| 37 | [Elements](https://www.tamtam.ai/c/elements-denver) (elementsofplace.com)<br>This company focuses on placemaking by understanding people's needs to create inspiring environments through design, consulting, furnishings, and construction services | Design Services | 🇺🇸 Denver | 403 | 2008 |
| 38 | [EnergyScape Renewables](https://www.tamtam.ai/c/energyscape-renewables) (energyscaperenewables.com)<br>A leading provider of comprehensive Solar CAD Designs and Engineering services to US developers and EPC's worldwide, ensuring fast regulatory approval | Operations Consulting | 🇺🇸 Denver | 391 | 2019 |
| 39 | [JR Engineering](https://www.tamtam.ai/c/jr-engineering) (jrengineering.com)<br>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 | Civil Engineering | 🇺🇸 Centennial | 387 | 1973 |
| 40 | [Galloway & Company, LLC](https://www.tamtam.ai/c/galloway-and-company-llc) (gallowayus.com)<br>A multidisciplinary firm in architecture, engineering, and survey services, providing full support for development projects with a collaborative, client-focused approach | Architecture and Planning | 🇺🇸 Greenwood Village | 378 | 1982 |
| 41 | [NEI Electric Power Engineering, Inc.](https://www.tamtam.ai/c/nei-electric-power-engineering-inc) (neiengineering.com)<br>NEI provides professional power system engineering services, specializing in renewables, substation design, transmission, distribution, and construction management with experienced engineers | Engineering Services | 🇺🇸 Lakewood | 355 | 1982 |
| 42 | [Apex IT](https://www.tamtam.ai/c/apex-it) (apexit.com)<br>A technology consulting firm providing enterprise solutions like Oracle and Salesforce, specializing in CRM, HCM, financial reporting, and Business Intelligence | IT Services and IT Consulting | 🇺🇸 Denver | 345 | 1997 |
| 43 | [Xclusive Services](https://www.tamtam.ai/c/xclusive-services) (xclusivestaffing.com)<br>Custom staffing solutions tailored to clients' needs, recruiting skilled and motivated staff to help achieve business objectives | Staffing and Recruiting | 🇺🇸 Denver | 345 | 2002 |
| 44 | [IntelliSource](https://www.tamtam.ai/c/intellisource) (intellisource.com)<br>Innovative outsourcing company specializing in solving business challenges through customizable solutions in BPO, RPO, and Total Talent Management | Business Consulting and Services | 🇺🇸 Denver | 343 | 1999 |
| 45 | [The Proof Positive Group: MS Word Expert & PowerPoint Expert \| Templates \| Formatting \| RFP \| PC/Mac](https://www.tamtam.ai/c/the-proof-positive-group-ms-word-expert-and-powerpoint-expert-templates) (mswordpowerpointexpert.com)<br>Specializing in expert Microsoft Office support services for document needs, including template development, document formatting, PDF merges, and more for PC and Mac users | Business Consulting and Services | 🇺🇸 Denver | 343 | 2001 |
| 46 | [Richey May](https://www.tamtam.ai/c/richey-may) (richeymay.com)<br>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 | Accounting | 🇺🇸 Englewood | 327 | 1985 |
| 47 | [MRC Recruiting](https://www.tamtam.ai/c/mrc-recruiting) (mrcrecruiting.com)<br>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 | Staffing and Recruiting | 🇺🇸 Denver | 326 | 1984 |
| 48 | [Sanborn](https://www.tamtam.ai/c/sanborn) (sanborn.com)<br>A leader in geospatial solutions, specializing in aerial imaging, LiDAR mapping, 3D modeling, indoor mapping, and software products for global customers | Professional Services | 🇺🇸 Colorado Springs | 316 | 1866 |
| 49 | [RMG Engineers](https://www.tamtam.ai/c/rmg-engineers) (rmg-engineers.com)<br>RMG Engineers and Architects offers a wide range of engineering and architectural services in Colorado, focusing on client needs and delivering successful outcomes | Engineering Services | 🇺🇸 Colorado Springs | 308 | 1986 |
| 50 | [The Premier Group](https://www.tamtam.ai/c/the-premier-group) (thepremiergroupus.com)<br>An executive search and placement firm providing supplemental skilled manpower to general contractors and sub contractors for commercial and industrial construction projects nationwide | Staffing and Recruiting | 🇺🇸 Denver | 273 | 2008 |

## 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 12, 2026.

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Source: https://www.tamtam.ai/l/professional-services-firms-colorado