| # | Company | Employees |
|---|---|---|
| 1 |
Tesla Austria GmbHtesla.com
A company focused on accelerating the world's transition to sustainable energy through electric vehicles and clean energy generation and storage solutions |
128,000 |
| 2 |
Koch Ag & Energy Solutionskochinc.com
Operating diverse global industries worldwide, this company focuses on improving essential aspects of life such as food, clothing, water, transportation, and technology, with 120,000 employees. |
120,000 |
| 3 | 99,488 | |
| 4 | 79,707 | |
| 5 |
GE Vernovalinktr.ee
A purpose-built company focused on electrifying the planet and decarbonizing it through a diverse portfolio of energy businesses, ensuring reliable and sustainable energy |
70,646 |
| 6 |
Baker Hughesbakerhughes.com
Energy technology company providing innovative solutions globally, focusing on safety, efficiency, and sustainability in the energy and industrial sectors |
67,440 |
| 7 |
Caterpillar Inc.caterpillar.com
A global leader in manufacturing construction and mining equipment, engines, turbines, and locomotives, focused on sustainability and providing value to customers worldwide |
62,810 |
| 8 |
Halliburtonhalliburton.com
Collaborates to engineer solutions maximizing energy asset value, from locating hydrocarbons, managing data, drilling, evaluating, and constructing wells, to optimizing production. |
60,277 |
| 9 |
Cummins Inc.cummins.com
empowering diverse professionals through career growth, innovation, and development in engineering, manufacturing, marketing, and supply chain roles worldwide |
60,000 |
| 10 |
Chevronchevron.com
The company values its people and their innovation in tackling energy challenges, fostering open and respectful communication on LinkedIn |
55,495 |
| 11 |
Amentumamentum.com
Amentum is a global leader in engineering, project management, and solutions integration, specializing in modernizing critical missions worldwide with speed and confidence |
50,000 |
| 12 | 42,789 | |
| 13 | 37,645 | |
| 14 |
GE Aerospacegeaerospace.com
A global provider of jet and turboprop engines, components, and systems for various types of aircraft, enhancing the world through flight |
37,191 |
| 15 |
Koch Engineered Solutionskochengineeredsolutions.com
A provider of uniquely engineered solutions in construction, mass transfer, combustion control, filtration, materials applications, and automation as a subsidiary of Koch Industries |
29,952 |
| 16 |
Dominion Energydominionenergy.com
A company headquartered in Richmond, Va, providing electricity and natural gas to 7 million customers in 15 states with a focus on sustainability and safety |
27,676 |
| 17 |
PT PLN (Persero)pln.co.id
Sole provider of electricity in Indonesia, striving to improve service quality, with a long history and significant assets in the industry |
26,545 |
| 18 |
Duke Energy Corporationduke-energy.com
Electric and natural gas utilities serving millions, focusing on clean energy transition, grid upgrades, and net-zero emissions goals. |
25,788 |
| 19 |
Carriercarrier.com
A global leader in intelligent climate and energy solutions, pioneering new technologies and industries for a safer, sustainable, and comfortable world |
25,379 |
| 20 |
Pacific Gas and Electric Companypge.com
Transmission and delivery of natural gas and electricity to approximately 15 million customers across a large service area in California. |
23,550 |
| 21 |
McDermott International, Ltdmcdermott.com
Engineering and construction solutions for global energy industry, focusing on sustainable energy infrastructure and energy transition projects worldwide. |
23,162 |
| 22 |
Casey'scaseys.com
A convenience store chain founded in 1959, known for clean stores, friendly service, fresh food, and a focus on small communities |
20,674 |
| 23 |
Exelonexeloncorp.com
A leading utility company providing reliable and affordable energy to over 10 million customers in urban areas across multiple states, with a commitment to sustainability and community support |
20,291 |
| 24 |
Tenaristenaris.com
A leading supplier of tubes and services for the energy industry and other industrial applications, with a global workforce committed to continuous improvement |
20,000 |
| 25 |
Air Productsairproducts.com
Supplier of industrial gases serving over 250,000 customers in more than 50 countries worldwide with diverse applications. |
20,000 |
| 26 |
Cameron Productsslb.com
A leading provider of flow equipment products, systems, and services for the global oil, gas, and process industries, with a strong global network |
18,396 |
| 27 |
GE Powergepower.com
A global energy leader offering technology, solutions, and services spanning the energy value chain, serving customers in over 150 countries |
17,248 |
| 28 |
Marathon Petroleum Corporationmarathonpetroleum.com
Operates the nation's largest refining system, markets petroleum products, and manages midstream assets for gathering, processing, and transportation. |
17,048 |
| 29 |
ConocoPhillipsconocophillips.com
A global oil and gas company focusing on safely finding and delivering energy worldwide while fostering a great workplace and community |
16,478 |
| 30 | 16,319 | |
| 31 |
NRG Energynrg.com
Provides innovative natural gas, electricity, and smart home energy solutions to a diverse range of customers across North America. |
16,171 |
| 32 |
Love's Travel Stopsloves.com
Family-owned company operating over 600 travel stops across 42 states, emphasizing clean facilities, friendly service, and strong core values. |
15,823 |
| 33 |
LyondellBaselllyondellbasell.com
Leading global chemical company producing innovative polymers and polyolefins for sustainable transportation, food safety, clean water, and healthcare applications. |
15,172 |
| 34 |
Flowserve Corporationflowserve.com
Global manufacturer of pumps, valves, and seals with a rich heritage, providing innovative solutions for industries worldwide through experience, leadership, and creativity |
14,750 |
| 35 |
Phillips 66phillips66.com
A global energy company focused on manufacturing petroleum products, natural gas processing, and petrochemical production, prioritizing safety, honor, and commitment |
14,000 |
| 36 |
Oceaneeringoceaneering.com
Global technology company providing engineered services, products, and robotic solutions to offshore energy, defense, aerospace, and manufacturing industries worldwide |
13,838 |
| 37 |
Constellationconstellationenergy.com
Leader in clean energy production and services, accelerating transition to carbon-free future through diverse energy portfolio, sustainability initiatives, and technology investments |
13,291 |
| 38 |
American Electric Poweraep.com
The company is focused on reducing carbon footprint, empowering communities, developing workforce, shifting to clean energy sources, and building stronger communities for the future |
13,166 |
| 39 |
Southern California Edison (SCE)sce.com
A leading electric utility in Southern California focused on bringing clean and renewable energy sources to reduce emissions and promote innovation |
12,652 |
| 40 |
NextEra Energy, Inc.nexteraenergy.com
Leading electric utility company providing reliable electricity to millions, developing diverse energy sources including natural gas, nuclear, renewables, and battery storage. |
12,649 |
| 41 |
Westinghouse Electric Companywestinghousenuclear.com
Global leader in providing safe and innovative nuclear technology, offering reliable power plants, fuel, automation, and services with a focus on safety and sustainability |
12,455 |
| 42 |
Entergyentergy.com
This company provides safe, affordable, and reliable energy to the Middle South region, with a focus on clean power generation and community impact |
12,253 |
| 43 | 12,096 | |
| 44 |
Xcel Energyxcelenergy.com
providing reliable, resilient, and sustainable energy services to customers across eight states, focusing on excellent service and growth opportunities |
12,073 |
| 45 |
Southern Companysoutherncompany.com
A company and its subsidiaries provide clean, safe, reliable energy to 9 million customers with a focus on service excellence, community value, and net zero emissions by 2050 |
12,062 |
| 46 |
Black & Veatchbv.com
An employee-owned global leader in building critical human infrastructure in Energy, Water, Telecommunications, and Government Services since 1915 |
11,691 |
| 47 |
H&Phelmerichpayne.com
Provider of advanced drilling technologies and solutions enhancing productivity, reliability, safety, and efficiency in land, international, and offshore operations. |
11,576 |
| 48 |
Panasonic North Americabit.ly
Leading technology partner providing integrated solutions across various industries like automotive, energy, retail, and more to create breakthrough technologies for a better life and world |
11,525 |
| 49 |
General Atomicsga.com
Development of advanced technology solutions including unmanned aerial vehicles, research reactors, aircraft systems, MagLev transport, and fusion energy for global customers. |
11,213 |
| 50 |
Valerovalero.com
Manufacturing, marketing transportation fuels, petrochemical products. Operating petroleum refineries, ethanol plants, and renewable diesel facilities for wholesale markets. |
11,096 |
| 51 |
City of Seattleseattle.gov
Providing diverse public services across multiple departments to support community well-being, infrastructure, and inclusive city development. |
10,924 |
| 52 |
Sunrunsunrun.com
The company offers a modern energy experience with reliable, affordable, and clean energy made from the sun, giving customers freedom in powering their lives |
10,526 |
| 53 |
Con Edisonconed.com
Providing reliable electricity to millions, focusing on clean energy transition, energy efficiency, and infrastructure resilience against extreme weather. |
9,822 |
| 54 |
CHS Inc.chsinc.com
A global agribusiness offering energy, grains, foods, and agricultural services to farmers, ranchers, and cooperatives for business growth and sustainability |
9,750 |
| 55 |
DTE Energydteenergy.com
Provides diversified energy solutions including renewable energy, emission control technologies, and energy services primarily serving Michigan communities. |
9,635 |
| 56 |
EG Americaeg-america.com
A rapidly growing convenience store retailer in the US, part of a global company, offering top-notch products and services nationwide |
9,343 |
| 57 | 9,330 | |
| 58 |
Kinder Morgan, Inc.kindermorgan.com
Transports and stores natural gas, refined petroleum products, crude oil, CO2, and renewable fuels through extensive pipelines and terminals across North America. |
9,312 |
| 59 |
City of Austinaustintexas.gov
Local government managing city employees, providing public services, promoting transparency, innovation, and maintaining high quality of life standards. |
8,954 |
| 60 | 8,906 | |
| 61 |
Toshibatoshiba.com
A global technology company focusing on energy, infrastructure, electronics, and digital solutions to create a sustainable future for generations to come |
8,787 |
| 62 |
Tennessee Valley Authoritytva.com
A self-financing government-owned power provider focusing on delivering affordable electricity, environmental stewardship, and economic development in the Tennessee Valley region |
8,616 |
| 63 |
PSEGlanding.pseg.com
Delivering electricity and gas services to millions of customers in New Jersey and Long Island, while prioritizing sustainability, community investment, and workforce development |
8,371 |
| 64 |
Eversource Energyeversource.com
A Fortune 500 energy company in New England, prioritizing safety, reliability, environmental leadership, and energy options for millions of customers |
8,353 |
| 65 |
Loews Corporationloews.com
Diversified company managing subsidiaries in insurance, pipelines, hotels, and packaging, providing strategic direction and corporate services to all. |
8,020 |
| 66 |
Florida Power & Lightfpl.com
Leading electric utility in America, providing affordable, reliable, and clean electricity to over 12 million people in Florida Recognized for exceptional reliability |
7,783 |
| 67 |
Solar Turbinessolarturbines.com
Manufacturer of industrial gas turbines, compressors, and generator sets used in oil, gas, and power generation projects globally. |
7,656 |
| 68 |
Hubbell Incorporatedhubbell.com
Manufacturer of utility and electrical solutions focused on grid modernization, clean energy, electrification, and energy efficiency worldwide. |
7,655 |
| 69 |
Nabors Industriesnabors.com
Provider of advanced drilling rigs, automation, and engineering solutions for safe, efficient, and responsible energy production worldwide. |
7,492 |
| 70 |
Schweitzer Engineering Laboratories (SEL)selinc.com
The company provides products and services for power system protection, monitoring, control, automation, communications, and metering with a focus on safety, reliability, and cost-effectiveness |
7,267 |
| 71 |
OneSubseaonesubsea.slb.com
A leading subsea technology provider focused on innovation to improve asset performance, increase energy efficiency, reduce emissions, and accelerate the energy transition |
7,149 |
| 72 |
PPL Corporationpplweb.com
Providing electricity to millions, building smarter, resilient power grids, advancing sustainable energy solutions, and fostering inclusive work environments. |
7,118 |
| 73 |
Avangridavangrid.com
A leading sustainable energy company with a focus on transitioning America to a clean future through its Networks and Renewables businesses |
7,096 |
| 74 |
Amerenameren.com
A Fortune 500 company based in St Louis, providing electric and natural gas services to millions of customers in Illinois and Missouri |
7,092 |
| 75 |
CenterPoint Energycenterpointenergy.com
An investor-owned energy delivery company with operations in electric transmission, power generation, and natural gas distribution serving over 7 million customers |
7,080 |
| 76 |
Williamswilliams.com
Provides transport, storage, and delivery solutions for clean energy, operating critical infrastructure to support a low-carbon energy future. |
6,995 |
| 77 |
Enterprise Productsenterpriseproducts.com
Provider of midstream energy services in North America, offering growth opportunities, competitive compensation, and comprehensive employee benefits. |
6,939 |
| 78 |
Consumers Energycareers.consumersenergy.com
Consumers Energy is Michigan's energy provider offering careers in a dynamic industry focused on safe, efficient, and sustainable energy generation |
6,839 |
| 79 |
First Solarfirstsolar.com
Leading American company specializing in advanced thin film photovoltaic technology, manufacturing high-performance solar modules for reliable power generation. |
6,686 |
| 80 |
NiSourcenisource.com
A utility company serving 4 million customers across 6 states with safe, reliable, and affordable gas and electric services, investing in infrastructure for the future |
6,597 |
| 81 |
Noble Corporationnoblecorp.com
Leading offshore drilling contractor operating advanced fleet focused on ultra-deepwater and high-specification jackup drilling worldwide. |
6,572 |
| 82 |
Praxair, Inc - a Linde Companylindeus.com
A global leader in industrial gases and engineering, providing high-quality gases, technologies, and services to diverse markets while promoting sustainability and productivity |
6,549 |
| 83 | 6,516 | |
| 84 |
Sunoco LPsunocolp.com
Extensive pipeline network and terminals supporting fuel distribution to thousands of branded locations, independent dealers, and commercial customers. |
6,493 |
| 85 |
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 |
| 86 |
HF Sinclairhfsinclair.com
Manufactures and sells light products, fuels, lubricants, and asphalt; operates refineries; markets motor fuel; produces renewable diesel and specialized lubricants. |
6,426 |
| 87 |
FirstEnergyfirstenergycorp.com
Forward-thinking electric utility dedicated to safety, reliability, and operational excellence Serving customers in multiple states with transmission lines connecting regions |
6,420 |
| 88 |
Mortensonmortenson.com
A top-25 builder, developer, and provider of energy and engineering services in the US, committed to advancing organizations' strategies |
6,419 |
| 89 |
Dover Corporationdovercorporation.com
A global manufacturer and solutions provider delivering innovative equipment, components, and digital solutions across various industries with operational agility and entrepreneurial approach |
6,338 |
| 90 |
NextEra Energy Resourcesjobs.nexteraenergy.com
Development and operation of renewable, battery storage, natural gas, nuclear power, transmission assets, retail energy solutions, and integrated energy services. |
6,274 |
| 91 |
Clariosclarios.com
Global leader in advanced energy storage solutions, producing 150 million batteries annually for a third of the world's vehicles Expanding capacity to meet future demand |
6,268 |
| 92 |
EnerSysenersys.com
Global leader in stored energy solutions for industrial applications, offering motive power, reserve power, aerospace/defense, specialty batteries, and integrated services worldwide |
6,257 |
| 93 |
Vontiervontier.com
A global industrial technology company specializing in smarter transportation, mobility technologies, fueling, fleet management, telematics, vehicle diagnostics, and smart cities solutions |
6,201 |
| 94 |
Energizer Holdingsenergizerholdings.com
A global organization creating innovative products to improve lives, focused on serving customers, driving revenue, and delivering long-term value |
6,098 |
| 95 |
TravelCenters of Americata-petro.com
A nationwide network of travel centers offering fuel, truck services, dining options, merchandise, and parking to enhance the road trip experience |
6,057 |
| 96 |
Maverik, Inc.maverik.com
A leading independent fuel marketer in the Intermountain West, offering premium BonFireโข food, fuel, drinks, and snacks at over 350 locations |
6,025 |
| 97 |
The AES Corporationaes.com
Energy company focused on innovative, customized solutions for organizations with a collaborative approach, empowering growth and driving impact in the energy sector |
5,910 |
| 98 |
Seadrillseadrill.com
Deepwater drilling company providing modern fleet, experienced crews, advanced technologies to unlock oil and gas resources for various oil companies. |
5,896 |
| 99 |
Curtiss-Wright Corporationcurtisswright.com
Global manufacturer providing highly engineered products and advanced technology solutions for critical functions within international commercial, industrial, defense, and energy market sectors. |
5,835 |
| 100 |
Itron, Inc.na.itron.com
This company enables utilities and cities worldwide to deliver critical infrastructure services through smart networks, software, meters, and sensors for energy and water management |
5,820 |
Turn this list into pipeline
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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 Oct 24, 2026.
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