Editor’s note: The information in this list was taken from the Energage database. The businesses provide the data, and it may have changed since it was first entered.
No. 1
Years ranked: 6
Founded: 2017
Headquarters: Lakewood
Employees: 354
Facts: West + Main is an independently owned and operated boutique real estate company specializing in residential properties along the Front Range and mountain communities.
No. 2
Years ranked: 5
Founded: 2002
Headquarters: Wheat Ridge
Employees: 250
Facts: Bloom Healthcare’s providers deliver coordinated, hands-on care in assisted living communities and private homes to help patients age in place. The company works to reduce seniors’ risk of needing emergency room or inpatient care.
No. 3
Years ranked: 2
Founded: 1999
Headquarters: Denver
Employees: 175
Facts: Zivaro is a Colorado-based provider of technology services and solutions.
No. 4
Fairway Independent Mortgage Corp.
Years ranked: 3
Founded: 1996
Headquarters: Madison, Wis.
Employees: 5,563, with 160 in Colorado
Facts: Fairway Independent Mortgage Corporation, a mortgage lender, has over 500 branches.
No. 5
Years named: 3,
Founded: 2004
Headquarters: Denver
Employees: 160
Locations: 2
Facts: Vivax Pros protects and beautifies homes by offering exterior and interior painting, siding, and gutter installation. The company also plants a tree for every customer it serves.
No. 6
Years ranked: 11
Founded: 2008
Headquarters: Greenwood Village
Employees: 173
Locations: 5
Facts: Madison & Co. focuses on providing broker support, a collaborative team environment, and an extensive mentoring program.
No. 7
Cooper Heating and Cooling Inc.
Years ranked: 5
Founded: 1978
Headquarters: Broomfield
Employees: 162
Locations: 1
Facts: Cooper Heating and Cooling is a full-service HVAC company that offers installation, repair, maintenance, and replacement services. Cooper was the first company in Colorado to seal duct joints with a putty-like paste to prevent air leakage. The technique is now an industry standard.
No. 8
Years ranked: 5
Founded: 1969
Headquarters: Denver
Employees: 190
Locations: 9
Facts: General Air Service & Supply is a third-generation, family-owned business, and Colorado’s largest independent gas and welding supplier.
No. 9
Years ranked: 11, 9 consecutive
Founded: 2008
Headquarters: Wheat Ridge
Employees: 150
Locations: 3
Facts: Visiting Angels of Denver provides supportive home care services for seniors and adults that allow them to safely stay in their homes and provide peace of mind to their families.
No. 10
Years ranked: 10, 5 consecutive
Founded: 1888
Headquarters: Concord, California
Employees: 1,817, with 236 in Colorado
Facts: Swinerton Builders is an employee-owned general contractor. In the Denver metro area, the company built the Four Seasons Hotel and Private Residences, One Lincoln Park, campus projects for AMG National Trust Bank and Terumo, and office environments for Fidelity Investments, UBS Financial, Google, and Kaiser Permanente. Swinerton also built schools for Denver Public Schools and parking structures for RTD.
No. 11
Years named: 4
Founded: 1996
Headquarters: Greenwood Village
Employees: 186
Locations: 1
Facts: Samuel Engineering provides engineering, procurement, and construction management services to the mining, oil and gas, power, and building systems industries worldwide.
No. 12
Years ranked: 5
Founded: 1997
Headquarters: Cincinnati, Ohio
Employees: 9,000, with 168 in Colorado
Facts: TQL works with a network of more than 160,000 carriers to connect customers with shipping needs with carriers with the available capacity and service offerings. The company moves 3 million loads of freight annually.
No. 13
Years ranked: 11
Founded: 2005
Headquarters: Broomfield
Employees: 229
Locations: 6
Facts: PorchLight Real Estate Group offers concierge-style real estate services in the greater Denver metro area and Boulder. A 100% women-owned business, PorchLight has received numerous accolades. In addition to being named to The Denver Post’s Top Workplaces list for 11 years, the company won awards from the Denver Business Journal and ColoradoBiz Magazine and has been recognized as the No. 1 Denver-Area LGBTQ-owned company.
No. 14
Applewood Plumbing Heating & Electric
Years ranked: 11, 8 consecutive
Founded: 1973
Headquarters: Denver
Employees: 200
Facts: Applewood Plumbing Heating & Electric, known for its bright orange trucks, is one of Colorado’s only family-owned plumbing, heating, drain cleaning, cooling, and electrical repair companies.
No. 15
Years ranked: 3
Founded: 2016
Headquarters: Greenwood Village
Employees: 415, with 237 in Colorado.
Facts: Nextworld is a cloud-based enterprise applications platform that helps businesses innovate. Its software offers analytics, reporting, security, process automation, testing, system administration and more.
No. 16
Years ranked: 2
Founded: 2013
Headquarters: Denver
Employees: 986, with 169 in Colorado
Locations: 1
Facts: Housecall Pro is dedicated to supporting home service professionals and helping them succeed with comprehensive software for scheduling, dispatching, job management, and more. The company serves over 25,000 HVAC, plumbing, electrical, cleaning, and other field service businesses.
No. 17
Years ranked: 10
Founded: 1965
Headquarters: Littleton
Employees: 456, with 303 in Colorado
Locations: 4
Facts: LONG Building uses building technology services to make commercial, institutional, and industrial facilities of all types and sizes automated, efficient, green and safe.
No. 18
Years ranked: 12, 8 consecutive
Founded: 1996
Headquarters: Denver
Employees: 270
Locations: 2
Facts: Physician Health Partners works with PHPprime and Colorado Community Health Alliance to provide healthcare to more than 500,000 Coloradans in Denver and Colorado Springs.
No. 19
Years ranked: 9
Founded: 1973
Headquarters: Centennial
Employees: 415, with 380 in Colorado
Locations: 3
Facts: Haselden Construction is a top general contractor on the Front Range. It provides exceptional, client-centric construction services in Colorado, Wyoming, and the Western United States. The company offers general contracting, construction management, design-build, turnkey development, and preconstruction services.
No. 20
Years ranked: 7
Founded: 1982
Headquarters: Greenwood Village
Employees: 237
Facts: Based in the Denver Tech Center, Galloway & Company provides planning, architecture, and engineering services for projects that range from half-acre pad sites to master-planned communities.
No. 21
Years ranked: 3
Founded: 1995
Headquarters: Aurora
Employees: 436
Facts: Colorado Access is a nonprofit health plan offering members personalized care and services since 1994.
No. 22
Years ranked: 3
Founded: 1931
Headquarters: Denver
Employees: 300
Facts: Colorado Public Employees’ Retirement Association (PERA) is the state’s largest public pension plan, providing retirement and other benefits to more than 630,000 current and former public employees.
No. 23
NEI Electric Power Engineering Inc.
Years ranked: 5
Founded: 1982
Headquarters: Lakewood
Employees: 307, with 181 in Colorado
Facts: NEI Electric Power Engineering, Inc. is a privately held engineering firm specializing in sustainable and reliable power systems. It offers services throughout the project lifecycle, from conceptualization to construction, and includes photovoltaic design, battery energy storage systems, wind collection, substation design, and more.
No. 24
Years ranked: 6
Founded: 1944
Headquarters: Fargo, North Dakota
Employees: 1,135, with 284 in Colorado
Locations: 1
Facts: Ulteig specializes in infrastructure engineering, technical services, and consulting. Its clients include global energy producers, private developers, government agencies, and locally funded cities.
No. 25
Years ranked: 1
Founded: 1874
Headquarters: Erie
Employees: 298
Facts: Erie has a population of around 25,000, with 17,387 living in Weld County and 12,651 in Boulder County. Erie is known for its small-town feel, scenic trails, and majestic views.
No. 26
Years ranked: 13
Founded: 1898
Headquarters: Kansas City, Missouri
Employees: 13,500, with 408 in Colorado
Facts: Burns & McDonnell is one of the largest engineering and architecture companies in the United States, with over 13,500 employees in 60 offices worldwide.
No. 27
Years ranked: 2
Founded: 2006
Headquarters: Louisville
Employees: 185
Facts: Alchemer, formerly SurveyGizmo, provides survey software to help gather customer feedback and market research for more than 13,000 customers.
No. 28
Adolfson & Peterson Construction
Years ranked: 8, 7 consecutive
Founded: 1946
Headquarters: Aurora
Employees: 640, with 319 in Colorado
Locations: 1
Facts: Adolfson & Peterson Construction is a family-owned company consistently ranked among the nation’s top construction managers and general contractors.
No. 29
Years ranked: 10, 9 consecutive
Founded: 1985
Headquarters: Denver
Employees: 189
Locations: 2
Facts: Donor Alliance is the organ and tissue procurement agency for Colorado and most of Wyoming. The not-for-profit organization serves 6.3 million residents and more than 117 hospitals.
No. 30
Years ranked: 4, 3 consecutive
Founded: 1913
Headquarters: Seattle
Employees: 4,500, with 159 in Colorado
Facts: Moss Adams is a fully integrated professional services firm dedicated to assisting clients with growing, managing, and protecting prosperity.
No. 31
Years ranked: 10, 3 consecutive
Founded: 1988
Headquarters: Houston, Texas
Employees: 1,900, with 210 in Colorado
Locations: 12 in Colorado
Facts: Cornerstone Home Lending is a full-service residential mortgage banker. Cornerstone’s home loan transactions are handled in-house to ensure the company meets its agreed-upon closing date.
No. 32
Years ranked: 10
Founded: 2011
Headquarters: Smithfield, Rhode Island
Employees: 2,400, 308 in Colorado
Facts: Esler Companies is the largest affiliate of Renewal by Anderson, a manufacturer of replacement windows and doors. The company offers services such as design consultation, window coverings, patio doors, and entry doors.
No. 33
Years ranked: 11, 2 consecutive
Founded: 2020
Headquarters: Denver
Employees: 758, with 257 in Colorado
Locations: 9
Facts: AIR Communities is a Real Estate Investment Trust leader, providing quality apartment homes across 15 states and the District of Columbia.
No. 34
Years named: 2
Founded: 2012
Headquarters: Denver
Employees: 820, with 261 in Colorado
Facts: Mission Rock Residential manages over 30,000 apartment homes in 16 states.
No. 35
Years named: 5, 2 consecutive
Founded: 1985
Headquarters: Houston
Employees: 2,895, with 175 in Colorado
Facts: EOG Resources explores, develops, produces, and markets crude oil, natural gas, and natural gas liquids.
No. 36
Years ranked: 7
Founded: 1902
Headquarters: New York
Employees: 11,482, with 239 in Colorado
Facts: Turner Construction Company completes $15 billion of construction on 1,500 projects annually.
No. 37
Years ranked: 1
Founded: 1976
Headquarters: Fairfax, Virginia
Employees: 91,000, with 225 in Colorado
Facts: CGI is one of the world’s largest independent IT and business consulting services firms. The company delivers an end-to-end portfolio of capabilities, including strategic IT and business consulting, systems integration, managed IT and business process services, and intellectual property solutions.
No. 38
Years named: 8
Founded: 1985
Headquarters: Greenwood Village
Employees: 290, with 154 in Colorado
Locations: 14
Facts: Griffis Residential owns and manages high-quality apartment communities in premier locations, including Denver, Seattle, San Diego, Portland, Ore., and Austin, Texas.
No. 39
Years ranked: 4
Founded: 1958
Headquarters: Centennial
Employees: 230
Facts: Delta Dental of Colorado provides 1.5 million members with easy-to-use and managed dental benefits, making dental care more accessible and affordable.
No. 40
Years ranked: 4
Founded: 1996
Headquarters: Cleveland, Ohio
Employees: 6,800, with 162 in Colorado
Facts: CBIZ is one of the nation’s top accounting, tax, and advisory services providers.
No. 41
Years ranked: 6, 4 consecutive
Founded: 2005
Headquarters: Niwot
Employees: 300, with 205 in Colorado
Facts: Wiland is a leading marketing intelligence agency that provides data-driven marketing solutions to thousands of clients across the United States.
No. 42
Years ranked: 7
Founded: 1993
Headquarters: Broomfield
Employees: 380
Locations: 1
Facts: Zoll manufactures and develops medical devices and software solutions focused on clinical quality assurance, optimized operations, and data-driven analytics.
No. 43
Years named: 4
Founded: 1956
Headquarters: Denver
Employees: 196, with 154 in Colorado
Facts: Shaw Construction builds cutting-edge structures for resorts and hospitality, residential and multi-family, mountain builds, higher education, commercial and office space, and arts and cultural centers across the Rocky Mountain region.
No. 44
HCA Healthcare Continental Division/HealthONE
Years ranked: 3
Founded: 1991
Headquarters: Denver
Employees: 196
Facts: The HCA Healthcare Continental Division/HealthONE is among the largest healthcare systems in the metro Denver area. It has seven acute care hospitals, a pediatric hospital, a rehabilitation hospital, several free-standing emergency departments, numerous ambulatory surgery centers, CareNow urgent care and occupational medicine clinics, physician practices, and imaging centers.
No. 45
Years ranked: 1
Founded: 2016
Headquarters: Virginia Beach
Employees: 4,600, with 218 in Colorado
Facts: Groundworks provides residential foundation and water management solutions, including foundation repair, basement waterproofing, crawl space repair and encapsulation, plumbing, gutter installation, and concrete lifting services, and soil stabilizing solutions for residential and commercial projects.
No. 46
Years ranked: 1
Founded: 2006
Headquarters: Westminster
Employees: 236
Facts: Cerapedics is an orthopedics company that aspires to redefine the standard of care for bone repair by healing bones faster. Bone grafts, including Cerapedics’ products, are used annually in over 4 million spine, orthopedics, trauma, and interventional procedures worldwide.
No. 47
Years ranked: 2
Founded: 1926
Headquarters: Chicago
Employees: 17,344, with 443 in Colorado
Locations: 2
Facts: RSM provides middle market assurance, tax, and consulting services. With over 17,000 professionals in the U.S. and Canada and a global presence in 123 countries, the company works to meet its clients’ evolving needs.
No. 48
Years ranked: 3
Founded: 1970
Headquarters: Chesterfield, Missouri
Employees: 2,000, with 483 in Colorado
Facts: Waterway serves the St. Louis, Kansas City, Denver, Cleveland, and Chicago markets with full-service car wash services, gas, and convenience store facilities.
No. 49
Years ranked: 1
Founded: 2018
Headquarters: Greenwood Village
Employees: 300
Facts: Espire Dental isa group practice that offers a full range of dental services, including cosmetic dentistry, routine cleanings, and Invisalign.
No. 50
Years ranked: 3
Founded: 1999
Headquarters: Greenwood Village
Employees: 850, with 171 in Colorado
Locations: 4
Facts: Flexential offers a comprehensive suite of customized IT solutions, including integrated colocation, interconnection, cloud, data protection, and professional services.
No. 51
Years ranked: 2
Founded: 2011
Headquarters: Denver
Employees: 3,042, with 264 in Colorado
Facts: Liberty is a leading North American oilfield services firm that offers innovative suites of completion services and technologies to onshore oil and natural gas exploration and production companies.
No. 52
Years ranked: 1
Founded: 1950
Headquarters: Wheat Ridge
Employees: 180
Facts: Colorado’s largest independent distributor of plumbing and heating supplies.
No. 53
Years ranked: 1
Founded: 1969
Headquarters: Denver
Employees: 276, with 211 in Colorado
Facts: Bayaud Enterprises is a nonprofit organization that provides vocational services and employment programs to people with disabilities, mental illness, low income, and other barriers to employment.
No. 54
Years named: 6, 2 consecutive
Founded: 2001
Headquarters: Westminster
Employees: 1,000, with 168 in Colorado
Facts: Coalfire is a cybersecurity consulting firm that helps clients manage risk and avert cybersecurity threats.
No. 55
Years named: 9, 2 consecutive
Founded: 1990
Headquarters: Denver
Employees: 206
Facts: Lohmiller and Company is an independently owned wholesale distributor of heating, ventilation, and air conditioning equipment, parts, and supplies. The company primarily distributes Carrier products in Colorado and Wyoming.
No. 56
Years named: 8
Founded: 1998
Headquarters: Dallas, Texas
Employees: 11,099, with 250 in Colorado
Locations: 5 in Colorado
Facts: Encompass Health is one of the country’s largest Medicare-certified home health and hospice service providers. The company provides skilled nursing, physical therapy, occupational therapy, speech therapy, and additional services from more than 300 branch offices.
