Editor’s note: This information was taken from the Energage database. The businesses provide the data, and it may have changed since it was first entered into the database.
No. 1
Years named: 1
Founded: 1972
Headquarters: Houston, Texas
Employees: 3,016, with 98 in Colorado
Locations: 2 in Colorado
Facts: LJA is an employee-owned, multi-disciplinary consulting firm serving the Southeastern U.S. and Colorado across nine sectors: public infrastructure, land development, transportation, water resources, energy, rail, surveying, construction inspection, and environmental.
No. 2
Years named: 2
Founded: 2003
Headquarters: Honolulu, Hawaii
Employees: 1,300, with 50 in Colorado
Facts: The Nakupuna Companies consist of eight small businesses owned by a Native Hawaiian Organization that provides IT, logistics, and environmental services.
No. 3
Years named: 1
Founded: 1975
Headquarters: McLean, Virginia
Employees: 1559, with 61 in Colorado
Facts: AMERICAN SYSTEMS is a 100% employee-owned federal contractor delivering IT, Test and Evaluation, Program Support, Engineering and Analysis, and training solutions for national priority programs.
No. 4
Years named: 1
Founded: 1853
Headquarters: Detroit, Michigan
Employees: 1540, with 60 in Colorado
Facts: SmithGroup is the oldest continuously operating architecture and engineering firm in the United States.
No. 5
Years named: 9
Founded: 1937
Headquarters: Mayfield Village, Ohio
Employees: 70,000, with 441 in Colorado
Facts: Progressive is the second-largest auto insurer in the country, a leading seller of commercial auto, motorcycle, and boat insurance, and one of the top 15 homeowners’ insurance carriers. The company was the first auto insurance group to launch a website, the first publicly held company to report results monthly, and the first to offer pet injury coverage.
No. 6
Years named: 4
Founded: 2013
Headquarters: Denver
Employees: 1,586, with 145 in Colorado
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. 7
Years named: 2
Founded: 1975
Headquarters: Chantilly, Virginia
Employees: 3,364, with 50 in Colorado
Locations: 3 in Colorado
Facts: Koniag Government Services (KGS) is an Alaska Native Owned Corporation that provides solutions and services to Federal Government Agencies.
No. 8
Years named: 2
Founded: 2014
Headquarters: Bethesda, Maryland
Employees: 1,670, with 64 in Colorado
Facts: Aledade serves as the largest network of independent primary care organizations in the United States. It helps independent practices, health centers, and clinics deliver better care to their patients.
No. 9
Years named: 12
Founded: 2011
Headquarters: Smithfield, Rhode Island
Employees: 2,400, 321 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. 10
Years named: 2
Founded: 1891
Headquarters: Chicago, Illinois
Employees: 4,055, with 147 in Colorado
Facts: Sargent & Lundy is a global leader in power and energy, with a focus on decarbonization, renewable energy, nuclear power, and carbon capture. The firm offers services including consulting, design, construction management, and operations, with a focus on quality and safety.
No. 11
Years named: 4
Founded: 2004
Headquarters: Washington, D.C.
Employees: 2,042, with 60 in Colorado
Facts: WilmerHale is an international law firm dedicated to delivering high-quality legal services, fostering a diverse team of lawyers and staff, and promoting public service.
No. 12
Years named: 10, 8 consecutive
Founded: 1944
Headquarters: Fargo, North Dakota
Employees: 1,451, with 240 in Colorado
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. 13
Years named: 3
Founded: 2003
Headquarters: Dallas
Employees: 1,066, with 112 in Colorado
Facts: KidsCare Home Health is a pediatric home health agency that serves children with special needs. Services include nursing, speech therapy, occupational therapy, physical therapy, and case management.
No. 14
Years named: 3
Founded: 1937
Headquarters: Bethesda, Maryland
Employees: 1,421, with 64 in Colorado
Facts: Walker & Dunlop, LLC is a commercial real estate finance and advisory services firm.
No. 15
Years named: 8, 4 consecutive
Founded: 1985
Headquarters: Houston
Employees: 3,096, with 160 in Colorado
Facts: EOG Resources explores, develops, produces, and markets crude oil, natural gas, and natural gas liquids.
No. 16
Years named: 12, 5 consecutive
Founded: 1988
Headquarters: Houston, Texas
Employees: 1,900, with 212 in Colorado
Locations: 49 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. 17
Years named: 8
Founded: 2003
Headquarters: Lakewood
Employees: 1,308, with 1,079 in Colorado
Locations: 5
Facts: Encore Electric’s award-winning team excels at complex technical projects, including hospitals, universities, data centers, office buildings, and museums.
No. 18
Years named: 4, 1 consecutive
Founded: 1970
Headquarters: Chesterfield, Missouri
Employees: 2,000, with 255 in Colorado
Facts: Waterway Gas & Wash Co is a premier, full-service car wash and gasoline company.
No. 19
Years named: 1
Founded: 1927
Headquarters: Dallas, Texas
Employees: 5,500, with 95 in Colorado
Facts: Freeman is a global events company with nearly a century of experience in trade show strategy, creative design, AV production and logistics.
No. 20
Years named: 3
Founded: 2003
Headquarters: Denver
Employees: 1,300, with 606 in Colorado.
Facts: LINX is one of the largest technology integrators in the United States. It unifies network cabling, multimedia, security, and wireless systems under one umbrella and has delivered more than $1 billion in technology-related solutions across all 50 states.
No. 21
Years named: 2
Founded: 2012
Headquarters: Sandy, Utah
Employees: 1,132, 113 in Colorado
Facts: Brighton Hospice strives to provide patients and their families with the highest quality physical, emotional, and spiritual care.
No. 22
Years named: 1
Founded: 2014
Headquarters: Columbus, Ohio
Employees: 1,138, 50 in Colorado
Facts: Lower is a digitally focused fintech mortgage company that provides home loans, refinancing, and HELOCs in 47 states.
No. 23
Years named: 5
Founded: 1891
Headquarters: Greenwood Village
Employees: 13,300, with 2,376 in Colorado
Facts: Empower offers industry-leading solutions to help people manage their money for today while saving more for tomorrow.
No. 24
Years named: 4
Founded: 1996
Headquarters: Baton Rouge, Louisiana
Employees: 70,000, with 1,451 in Colorado
Locations: 21 in Colorado
Facts: Raising Cane’s Chicken Fingers is one of America’s fastest-growing restaurant companies. It has over 700 restaurants in 36 states and five countries, with over 50 new restaurants under construction.
No. 25
Years named: 3
Founded: 1976
Headquarters: Fairfax, Virginia
Employees: 91,000, with 261 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. 26
Years named: 10, 3 consecutive
Founded: 1998
Headquarters: Dallas, Texas
Employees: 11,099, with 200 in Colorado
Locations: 6 in Colorado
Facts: Enhabit Home Health & Hospice is a leading provider of home-based healthcare, operating over 360 locations across 34 states.
No. 27
Years named: 2
Founded: 1972
Headquarters: Plano, Texas
Employees: 2,300, with 151 in Colorado
Facts: Westwood is an award-winning surveying and engineering services provider, specializing in commercial, public infrastructure, residential development, and renewable energy projects.
No. 28
Years named: 13, 5 consecutive
Founded: 1999
Headquarters: Denver
Employees: 70,000, with 3,414 in Colorado
Facts: DaVita provides kidney dialysis services in the United States and other countries. The company served approximately 265,400 patients at 3,113 outpatient dialysis centers in the United States and operated 453 centers in 13 other countries.
No. 29
Years named: 11, 3 consecutive
Founded: 1907
Headquarters: Englewood
Employees: 1,103
Locations: 1
Facts: Craig Hospital is a nonprofit rehabilitation and research hospital that specializes in neurorehabilitation and research for patients with spinal cord and brain injuries.
No. 30
Years named: 2
Founded: 1972
Headquarters: Highlands Ranch
Employees: 1265, with 345 in Colorado
Facts: UDR is a real estate investment trust that focuses on multifamily apartment communities and owns and manages properties across various U.S. markets.
No. 31
Years named: 1
Founded: 1937
Headquarters: Newton, Massachusetts
Employees: 6,993, with 80 in Colorado
Facts: Sonesta International Hotels Corporation is the 8th-largest hotel company in the U.S., with over 1,300 properties across 13 brands in 9 countries.
No. 32
Years named: 9
Founded: 1962
Headquarters: Reston, Virginia
Employees: 23,000, with 1,270 in Colorado
Locations: 6 in Colorado
Facts: CACI International Inc. provides information technology services to many branches of the federal government, including defense, homeland security, intelligence, and healthcare.
No. 33
Years named: 8, 1 consecutive
Founded: 2012
Headquarters: Leawood, Kansas
Employees: 1270, with 527 in Colorado
Facts: Tallgrass is a leading North American energy infrastructure company operating over 10,000 miles of pipeline — including Rockies Express and Pony Express — across 15 states, transporting natural gas and crude oil.
No. 34
Years named: 7, 1 consecutive
Founded: 1993
Headquarters: Charleston, South Carolina
Employees: 21,000, with 1,200 in Colorado
Facts: Greystar is the largest apartment operator in the U.S. and a leading global real estate company specializing in the investment, development, and management of rental housing. It provides apartments, student housing, and active adult communities. It serves more than 185 markets globally, with more than 500,000 units and offices in over 50 cities.
No. 35
Years named: 1
Founded: 1986
Headquarters: Dearborn, Michigan
Employees: 10,000, with 378 in Colorado
Facts: Founded to advocate for driver rights, fair laws, and safer vehicles, AAA has grown into a 60-million-member organization offering roadside assistance, travel services, and a range of insurance, automotive, and financial products.
No. 36
Years named: 5, 1 consecutive
Founded: 1967
Headquarters: Greeley
Employees: 1,544
Facts: Aims Community College is a public two-year institution serving Northern Colorado across four campuses and online, offering more than 200 degree and certificate programs spanning academic transfer and career training.
No. 37
Years named: 12
Founded: 1948
Headquarters: Denver
Employees: 1,265
Facts: HCA HealthONE Rose is known as “Denver’s Baby Hospital” and a leader in women’s care through its Rose Women’s Hospital. It also provides comprehensive services in orthopedics, cardiovascular care, and emergency medicine. HCA HealthONE Rose is part of HCA Healthcare’s Continental Division and one of the largest health systems in the country.
No. 38
Years named: 7, 6 consecutive
Founded: 1973
Headquarters: Rosemead, Calif.
Employees: 56,340, with 995 in Colorado
Facts: Panda Restaurant Group is the parent company of Panda Express, Panda Inn, and Hibachi-San. The family-owned company has 2,500 locations worldwide.
No. 39
Years named: 4, 1 consecutive
Founded: 1997
Headquarters: St Louis, Missouri
Employees: 7,000, with 50 in Colorado
Facts: PERFICIENT is a global digital consultancy with thousands of strategists and technologists across more than 40 locations in the U.S., Latin America, and India. The company helps the world’s leading brands transform their digital presence and customer experience through certified, agile project teams and a proven global delivery model.
No. 40
Years named: 1
Founded: 1987
Headquarters: Stamford, Connecticut
Employees: 1,651, with 50 in Colorado
Facts: PMI U.S. (Philip Morris International United States) contributes jobs, investment, and innovation across the country. In the U.S., PMI does not sell combustible cigarettes. Instead, it focuses on delivering a smoke-free future by offering alternatives to the 45 million American adults who use nicotine products.
No. 41
Years named: 1
Founded: 1993
Headquarters: Arlington, Virginia
Employees: 3,100, with 79 in Colorado
Facts: AvalonBay Communities is an equity REIT with a long-term track record of developing, redeveloping, acquiring, and managing apartment communities across the country’s top markets. With approximately 3,000 associates and more than 300 communities and regional offices nationwide, AvalonBay is focused on building long-term value and delivering risk-adjusted returns to shareholders.
No. 42
Years named: 1
Founded: 1986
Headquarters: Houston, Texas
Employees: 5,106, with 503 in Colorado
Facts: Asset Living is one of the largest third-party property management firms in the U.S., specializing in multifamily, student housing, affordable housing, and single-family rentals, with end-to-end services spanning leasing, marketing, and maintenance.
No. 43
Years named: 1
Founded: 2003
Headquarters: Atlanta, Georgia
Employees: 5,500, with 55 in Colorado
Locations: 6 in Colorado
Facts: PT Solutions is a clinician-founded practice dedicated to expanding access to transformative care across more than 550 communities in 25 states. It offers physical therapy, occupational therapy, speech-language pathology, athletic training, and sports medicine.
No. 44
Years named: 2
Founded: 1972
Headquarters: Wyomissing, Pennsylvania
Employees: 23,000, with 614 in Colorado
Facts: Penn Entertainment, formerly Penn National Gaming, operates integrated entertainment, sports content, and casino gambling. It manages 43 properties across 20 states, under brands including Hollywood Casino, Ameristar, and Boomtown.
No. 45
Years named: 2, 1 consecutive
Founded: 2016
Headquarters: Virginia Beach
Employees: 6,838, with 274 in Colorado
Facts: Groundworks provides residential foundation and water management solutions, including foundation repair, basement waterproofing, crawl space repair and encapsulation, plumbing, gutter installation, concrete lifting services, and soil-stabilizing solutions for residential and commercial projects.
No. 46
Years named: 2
Founded: 2019
Headquarters: Dallas, Texas
Employees: 12,123, with 900 in Colorado
Facts: Primoris Renewable Energy (PRE) specializes in self-performing EPC services for the energy sector, with an emphasis on solar photovoltaics, energy storage, and other renewable energy technologies.
No. 47
Years named: 1
Founded: 1964
Headquarters: Cincinnati, Ohio
Employees: 5,000, with 152 in Colorado
Facts: Hillman Solutions Corp. is a leading North American provider of hardware-related products and solutions to home improvement, hardware, and farm and fleet retailers. With over 60 years of industry experience, Hillman offers direct-to-store shipping, a dedicated in-store sales and service team of 1,200-plus professionals, and an extensive portfolio spanning hardware solutions (fasteners, screws, nuts and bolts), protective solutions (work gloves, jobsite storage, protective gear), and robotic and digital solutions (key duplication and tag engraving).
No. 48
Years named: 6
Founded: 1996
Headquarters: Cleveland, Ohio
Employees: 10,400, with 227 in Colorado
Facts: CBIZ is one of the nation’s top accounting, tax, and advisory services providers.
No. 49
Years named: 1
Founded: 1869
Headquarters: Chesterfield, Missouri
Employees: 8,700, with 154 in Colorado
Facts: Graybar is a leading North American distributor of electrical, communications, and data networking products, offering supply chain management and logistics services across the construction, commercial, institutional, government, industrial, and utility markets. Its products and services support new construction, infrastructure updates, building renovation, facility maintenance, repair and operations, and original equipment manufacturing.
