| # | Company | Employees |
|---|---|---|
| 1 |
Woodward, Inc.woodward.com
The company specializes in providing energy conversion and control solutions for aerospace and industrial equipment markets, facilitating a cleaner, decarbonized world |
6,438 |
| 2 |
Ovintivovintiv.com
A leading North American energy producer focused on developing oil, natural gas liquids, and natural gas producing plays with innovative strategies |
2,878 |
| 3 |
Liberty Energylinktr.ee
A leading North American oilfield services provider offering innovative completion services and technologies for onshore oil and gas exploration and production |
2,546 |
| 4 |
SM Energy Companysm-energy.com
An independent energy company focused on exploration, development, and production of natural gas and crude oil in the United States, prioritizing ethical business practices and community support |
2,255 |
| 5 |
City of Fort Collinsfcgov.com
Local government managing internal, financial, police, utilities, and community services while supporting education, recreation, culture, and economic opportunities. |
1,706 |
| 6 | 1,547 | |
| 7 |
DCP Midstreamdcpmidstream.com
An innovative energy company based in Denver, providing midstream logistics services in over 10 states Emphasizes employee development and competitive benefits |
1,446 |
| 8 |
Mears Group, Inc.mears.net
A leading energy infrastructure solutions provider offering engineering, construction, and maintenance services to various industries across North America |
1,297 |
| 9 |
Tallgrasstallgrass.com
A leading energy infrastructure company delivering safe, reliable, and sustainable energy solutions across the US for a cleaner energy future |
1,104 |
| 10 |
Tri-State Generation and Transmission Association, Inc.tristate.coop
A not-for-profit power supplier to electric cooperatives in the Western US, providing affordable, responsible-generated power to rural communities |
978 |
| 11 |
Western Area Power Administrationwapa.gov
Markets and delivers over 10,000 megawatts of hydropower from federal dams to various public and tribal entities across 15 states. |
946 |
| 12 |
City of Longmontlongmontcolorado.gov
A company based in Longmont, Colorado, offering a vibrant community with outdoor activities, high-tech companies, and a scenic location near Denver and Boulder |
945 |
| 13 |
Westmoreland Mining LLCwestmoreland.com
A leading coal company in the US with operations in surface mining, char production, and activated carbon plant ownership |
788 |
| 14 |
Yes Energyyesenergy.com
Yes Energy provides accurate and timely data, comprehensive tools, and expert guidance to help traders and power companies navigate the complex power market successfully |
675 |
| 15 |
Antero Resourcesanteroresources.com
An independent E&P company focused on exploiting, developing, and acquiring natural gas, NGLs, and oil properties in the Appalachia Basin |
634 |
| 16 |
MarkWest Energy Partners, L.P.mplx.com
A master limited partnership engaged in gathering, processing, and transporting natural gas, natural gas liquids, and crude oil in various regions of the United States |
579 |
| 17 |
Barber-Nicholsbarber-nichols.com
Specializing in engineering design and production of turbomachinery, the company offers custom products for aerospace, cryogenic, defense, and energy applications, as well as consulting and contract manufacturing |
572 |
| 18 |
QEP Resourcesqepres.com
A leading independent crude oil and natural gas exploration and production company, focused on the Permian Basin and Williston Basin in the US |
351 |
| 19 |
PDC Energy, Inc.chevron.com
Independent exploration and production company focused on responsible development of natural resources in key oil and gas regions, striving for sustainable growth and shareholder value |
276 |
| 20 |
Pivot Energypivotenergy.net
National solar provider with expertise in developing, financing, building, and managing solar and energy storage projects Offers services and software for the full solar ecosystem |
271 |
| 21 |
Civitas Resourcescivitasresources.com
A company with operational expertise in the energy industry, focusing on sustainability and delivering value to local economies and neighbors |
267 |
| 22 |
Onward Energyonwardenergy.com
An independent power platform operating utility-scale wind, solar, and natural gas projects across the US, providing reliable and renewable energy solutions |
260 |
| 23 |
Kodiak Oil & Gas Corpkodiakog.com
An independent exploration and production company based in Denver, focusing on oil and natural gas exploration in the US Rocky Mountain region |
232 |
| 24 |
Sentinel Peak Resourcessentinelpeakresources.com
A Denver-based company, backed by Quantum Energy Partners, that specializes in acquiring, developing, and exploring oil and gas assets, with a focus on heavy oil development in California |
202 |
| 25 |
SourceGaswebsafe.virginmedia.com
A natural gas utility providing distribution, transmission, storage, and related services to over 415,000 customers in multiple states |
191 |
| 26 |
TransMontaigne Partners LLCtransmontaignepartners.com
A leading provider of terminaling, storage, and transportation services to the energy industry with a network of midstream terminals across the US |
176 |
| 27 |
Namaste Solarnamastesolar.com
Employee-owned solar company specializing in residential, commercial, and utility-scale solar projects, with consulting, engineering, design, and maintenance services Eco-friendly and socially responsible business practices |
170 |
| 28 |
Anschutz Exploration Corporationanschutzexploration.com
Oil & energy company based in Denver, Colorado, USA, specializing in exploration and production activities in the energy sector |
161 |
| 29 |
United Energy Trading LLCunitedenergytrading.com
An integrated energy marketing and trading organization active in wholesale natural gas and crude oil trading, transportation, and transmission services across US and Canada |
152 |
| 30 |
Forest Oil Corporationforestoil.com
A company involved in exploring, acquiring, developing, and marketing natural gas and crude oil in North America and select international locations Headquarters in Denver |
146 |
| 31 |
RGS Energyrgsenergy.com
A leading provider of clean energy solutions since 1978, promoting renewable energy adoption through high-quality engineering, installation, and education |
127 |
| 32 |
JUWI Inc.juwiamericas.com
A developer, EPC contractor, and operator of large-scale renewable energy generation facilities globally, with a focus on the North American market |
118 |
| 33 |
FHEbuiltbyfhe.com
A company delivering superior customized tools and equipment with fast turnaround times to enhance productivity and success in the field |
117 |
| 34 |
Bill Barrett Corporationbillbarrettcorp.com
A company in the Rocky Mountain region operating in natural gas and oil exploration and development, focusing on high-return assets |
110 |
| 35 |
RockPile Energy Servicesrockpileenergy.com
Innovative completion services for fracturing with focus on Proppant Transportation and Chemical Optimization, reducing pad size, chemical costs, and carbon footprint |
104 |
| 36 |
Bison Oil & Gas IV, LLCbisonog.com
A leading exploration and production company in the DJ Basin and Rocky Mountain Region, emphasizing responsible, clean, and efficient operations |
101 |
| 37 |
ADVANCE Energy (Acquired by The AES Corporation)advanceenergyllc.com
Energy generation and infrastructure development firm specializing in utility-scale wind, solar, and transmission projects, providing project management, financing, and development services |
87 |
| 38 |
Independent Powersolarips.com
A provider of premium solar+storage systems for residential and commercial customers, focusing on innovation, energy resilience, sustainability, and community impact |
85 |
| 39 |
La Plata Electric Associationlpea.coop
An electric distribution cooperative serving over 33,000 members in Colorado and New Mexico, providing safe, reliable, and environmentally responsible energy services |
80 |
| 40 |
PureSky Energypureskyenergy.com
A company providing renewable energy solutions to energize progress, improve lives, and promote environmental stewardship for a sustainable legacy |
75 |
| 41 |
Meritage Midstreammeritagemidstream.com
A midstream services company offering natural gas, NGL, crude oil gathering, processing, and transportation, focusing on strategic partnerships and unconventional shale plays |
72 |
| 42 |
Aspectaspectholdings.com
A company focusing on prospecting and drilling for oil and gas resources, leveraging seismic, geological, and engineering expertise internationally to promote portfolio diversification |
65 |
| 43 |
Fidelity Exploration and Production Companyfidelityepco.com
A company involved in the acquisition, exploration, development, and production of natural gas and oil resources, part of a larger Fortune 500 group |
65 |
| 44 |
Raisa Energy LLCraisa.com
A Denver-based independent Oil & Gas exploration company using technology to accurately value risk and create value in major basins |
64 |
| 45 |
High Sierra Energy, LP - Subsidiary of NGL Energy Partners LPhighsierraenergy.com
A midstream energy company based in Denver, Colorado, operating in the natural resources industry, specializing in gathering, transporting, marketing crude oil and NGLs, and providing oilfield water services |
60 |
| 46 |
Concord Energy LLCconcordenergy.com
Leader in energy services and solutions offering natural gas, oil marketing, water services with a focus on customer trust and industry relationships |
56 |
| 47 |
Elk Petroleumelkpetroleum.com
Company specializing in developing and producing long-lived oil and gas reserves in the Greater Aneth Field, with ownership of wells, infrastructure, and operating units |
52 |
| 48 |
Extraction Oil & GasExtractionOG.com
A domestic energy company in the Rocky Mountains focusing on exploration and production of oil and gas reserves through drilling and acquisitions |
47 |
| 49 |
Encorpencorp.com
A global energy technology firm specializing in products and services for distributed energy markets, including microgrids, combined heat and power, and demand response solutions |
45 |
| 50 |
Peregrine Energy Solutions, LLCperegrineenergysolutions.com
The company operates a portfolio of clean renewable assets with a focus on utility-scale energy storage in North America |
44 |
| 51 |
1st Rate Energy Services, Inc.1strateenergy.com
A leading energy services provider specializing in production testing, cleaning, well optimization, and equipment maintenance for clients in North America |
34 |
| 52 |
RP Services, LLCrpservices.biz
A trusted energy services provider focused on quality, safety, and environmental preservation with a well-trained team committed to zero accidents |
34 |
| 53 |
Steelhead Compositessteelheadcomposites.com
An advanced manufacturing company based in Colorado that specializes in designing, engineering, and certifying hydrogen storage systems for various applications |
30 |
| 54 |
Trail Ridge Powertrailridgepower.com
The company provides energy management and generation solutions for commercial and industrial clients looking for portfolio-wide services |
27 |
| 55 |
Central Resources, Inc.dryneedlinginstitute.com
An independent oil and gas company with operations in the US, Argentina, Brazil, Canada, and The Netherlands, focusing on profitable growth and international transactions |
25 |
| 56 |
HRM Resourceshrmres.com
Oil and gas exploration and production company based in Denver, emphasizing trust, transparency, and accountability for a sustainable energy future |
20 |
| 57 | 19 | |
| 58 |
Expedition Water Solutions Coloradoexpedition-water.com
An oilfield infrastructure company operating in the DJ Basin of Colorado and PR Basin of Wyoming, demonstrating significant growth and market dominance |
18 |
| 59 |
Quanta Power Generation, Inc.ryancompany.net
A full-service EPC energy solutions provider offering flexible and comprehensive services for utility-scale and distributed generation renewable energy projects and energy storage |
18 |
| 60 |
Gary-Williams Energy Corporationgwec.com
An energy company with refining operations in Oklahoma, producing gasoline, diesel fuel, jet fuel, solvents, and asphalt with a total capacity of 185,000 bpd |
12 |
| 61 |
Available Poweravailable-power.com
Specializing in renewable energy, the company streamlines the process of deploying clean energy systems to make it simpler and more cost-effective for clients |
11 |
| 62 |
Bear Peak Powerbearpeakpower.com
Renewable energy development company specializing in solar and energy storage solutions for C&I, distributed generation, and utility scale projects Over 40 years of experience |
11 |
| 63 |
K2 Renewk2renew.com
Leader in secure, renewable energy solutions for communities, utilities, and businesses Provides project development, transactional support, and construction management for solar, storage, and wind projects |
10 |
| 64 |
AXP Energy Limitedfremontpetroleum.com
Oil & gas production and development company with operations in multiple US basins, focusing on building a reliable producing asset base for growth |
9 |
| 65 |
Alpha Flowback Corp.alphaflowback.com
A leading provider in the US oil and gas industry, prioritizing integrity, innovation, and customer relationships while upholding environmental consciousness |
8 |
| 66 |
Oban Powerobanpower.com
Providing holistic sustainability solutions for a cost-effective, stable, and environmentally conscious energy future through end-to-end services from assessment to operations |
8 |
| 67 |
Sustainable Villagesustainablevillage.com
A sustainable solutions provider offering products for energy generation, safe water, public health, communications, agriculture, and micro-enterprise employment worldwide |
8 |
| 68 |
Renewable Energy Advisorsrenewable-advisors.com
Provider of comprehensive renewable energy solutions, specializing in affordable and hassle-free solar options from system design to ongoing maintenance Committed to sustainability |
8 |
| 69 |
Tenawa Resource Management LLCtenawa-rm.com
A Colorado-based company offering midstream solutions through strategic partnerships Specializes in natural gas processing and helium recovery in the Mid-Continent region |
7 |
| 70 |
WILBANKS RESERVE CORPORATIONwilbanksreserve.com
An oil and energy company operating out of Denver, Colorado, focusing on oil exploration and extraction in the United States |
7 |
| 71 |
Earthling Energyearthling.energy
A company dedicated to providing environmentally conscious energy services to homeowners, creating a positive impact on the environment, economy, and society |
7 |
| 72 |
Valkyrie Operating, LLC.valkyrie-resources.com
Oil and gas production company located in Denver, CO, specializing in operating and developing oil and gas properties |
5 |
| 73 |
ALD NanoSolutions, Inc.forgenano.com
A leader in ALD technology, creating cost-effective advanced materials for various industries and partnering with world-leading companies for product innovation |
5 |
| 74 |
BV Power Solar Solutionssolarrenewableenergyservices.com
A team of dedicated experts providing top-quality solar energy solutions to empower individuals with sustainable practices for financial and environmental wellness |
4 |
| 75 |
Aspect Holdings, LLCaspectenergy.com
Exploring and producing oil & gas globally, specializing in 3D seismic exploration, shale gas, royalty acquisition, wind and potash development |
4 |
| 76 |
Global NES, Incglobalnesinc.com
A global leader in renewable energy solutions, specializing in solar, wind, hydroelectric, and geothermal technologies to provide efficient and customized energy options for clients |
4 |
| 77 |
HyperCellXhypercellx.com
This company specializes in engineering, manufacturing, and contracting related to green hydrogen technology |
4 |
| 78 |
Berrendo Energy LLCberrendoenergy.com
Denver-based renewable energy development company specializing in windfarm development and other renewable sources such as geothermal, storage, and solar, with expertise in project development and financing |
3 |
| 79 |
West Edgewestedgeenergy.com
A transportation and distribution company specializing in refined petroleum products, crude oil, natural gas, and water, providing infrastructure solutions to energy producers |
3 |
| 80 |
Divide Energy Groupdivideenergy.com
A midstream development company specializing in cost-effective infrastructure solutions to deliver energy supplies to market, focused on enhancing commodity value and bridging infrastructure gaps |
2 |
| 81 |
Switch Energy Solutionssolarcity.com
This company offers a wide range of energy solutions, focusing on energy efficiency and renewable energy to provide comprehensive and customized options to clients |
2 |
| 82 |
Myth, LLCthisismyth.com
Provider of comprehensive energy and utilities services including drilling, fluid engineering, equipment design, pipeline construction, maintenance, and directional drilling solutions for any project size |
2 |
| 83 |
ElektrikGreen, Incelektrikgreen.com
This company develops and produces hydrogen storage and fueling systems that are eco-friendly, efficient, and provide zero-carbon energy solutions |
2 |
| 84 | 2 | |
| 85 |
LarioEsco srllarioesco.it
The company is an Energy Service Company (ESCo) offering financing, design, construction, and management of energy services related to cogeneration, thermal recovery, energy efficiency consultation, and lighting technology |
2 |
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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 Oct 24, 2026.
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The same list elsewhere in United States
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