| # | Company | Employees |
|---|---|---|
| 1 |
Saipemsaipem.com
Global leader in engineering and construction for energy and infrastructure projects worldwide, offering offshore and onshore services with a focus on sustainability and innovation |
32,000 |
| 2 |
Prysmianprysmian.com
A global leader in high-tech cables & systems for energy and telecom, driving the energy transition and digitalization worldwide |
28,000 |
| 3 |
A2Agruppoa2a.it
A company in Italy focused on environment, water, and energy, promoting circular economy and sustainable development goals through various services and operations |
5,026 |
| 4 | 4,174 | |
| 5 |
Fastwebfastweb.it
A leading Italian telecommunications operator promoting digital transformation for a connected, inclusive, and sustainable future, investing in ultra-broadband networks and innovative services |
4,033 |
| 6 |
MAIREgroupmaire.com
A technology and engineering group focused on enabling the Energy Transition, offering Sustainable Technology and E&C Solutions in various sectors worldwide |
3,897 |
| 7 |
Italgasitalgas.it
A leading Network Tech Company in gas, water, energy efficiency, and IT sectors, providing services to millions of customers in Italy and Greece |
3,661 |
| 8 |
Snam S.p.A.snam.it
Leading European company specializing in natural gas transport, storage, and regasification services across multiple infrastructures and markets. |
3,337 |
| 9 |
Fastweb + Vodafonefastwebvodafone.it
Integration of fixed and mobile networks to provide innovative, competitive digital services for families, businesses, and national digital transformation. |
2,367 |
| 10 |
Siram Veoliaveolia.it
Provides integrated energy efficiency, water cycle management, and special waste services for public and private sectors to reduce emissions and resource waste. |
1,497 |
| 11 |
ENGIE Italiaengie.it
Global leader in low-carbon energy and services, focusing on reducing energy consumption and promoting environmentally friendly solutions for sustainable progress. |
1,419 |
| 12 |
De Noradenora.com
A multinational company specializing in electrochemistry and sustainable technologies, leading in industrial green hydrogen production, water treatment, and energy efficiency optimization |
1,267 |
| 13 |
Edison Nextedisonnext.it
The company focuses on caring for customers and territories through eco-friendly and decarbonization solutions, promoting innovation and sustainable growth |
1,170 |
| 14 |
ContourGlobalcontourglobal.com
Global power generation company focused on developing and operating clean energy assets worldwide to create economic and social value in local communities |
1,134 |
| 15 | 1,020 | |
| 16 | 697 | |
| 17 |
Sorgeniasorgenia.it
A leading energy provider in Italy, offering electricity, natural gas, and sustainable energy solutions through a flexible production model and digital technologies for a smooth customer experience |
691 |
| 18 |
Tamoil Italia S.p.A.tamoil.it
An oil company operating in Italy, focused on supply, logistics, distribution of petroleum products, and retailing, with a commitment to economic and social development |
690 |
| 19 |
Repower Italiarepower.com
A Swiss-based energy producer from renewable sources, operating in Switzerland and Italy, offering electricity, green energy, natural gas, and energy services |
571 |
| 20 |
Gruppo CAPgruppocap.it
This company manages the integrated water service in multiple areas, ensuring public control and transparency while investing in infrastructure and IT tools |
464 |
| 21 |
NHOA Energynhoa.energy
Leader in designing and delivering energy storage systems, transforming renewable energy into sustainable 24/7 power sources worldwide Operating for almost 20 years |
312 |
| 22 |
Atlanteatlante.energy
Develops and operates fast and ultra-fast electric vehicle charging stations, powered by 100% green energy, primarily across Southern Europe. |
239 |
| 23 |
Be Powerbepower.com
High-tech company transforming energy sector, integrating energy with mobility via digital flows, developing electric vehicle charging networks and managing energy purchasing. |
121 |
| 24 |
algoWattalgowatt.com
The company is a system integrator in the renewable energy sector, specializing in photovoltaic systems with turnkey solutions and energy production |
113 |
| 25 |
RECOM TECHNOLOGIESrecom-tech.com
manufacturer of high-efficiency photovoltaic modules, inverters, hybrid storage, batteries, and EV chargers for comprehensive solar energy solutions |
94 |
| 26 |
Free2move eSolutionsesolutions.free2move.com
A joint venture focused on designing, manufacturing, and supplying innovative e-mobility products and services worldwide to reduce CO2 emissions |
81 |
| 27 |
Bosch Energy and Building Solutions Italyboschbuildingsolutions.it
Energy and Building Solutions division offers integrated projects for safer, efficient, and comfortable buildings with cutting-edge technologies for energy, security, and connectivity |
78 |
| 28 |
Be Chargebec.energy
Develops Italy's extensive public infrastructure for electric vehicles, operating as both a CPO and EMSP to grow electric mobility nationwide. |
45 |
| 29 |
EDP Energia Italiaedpenergia.it
Global energy company operating across 4 continents and 20 countries, providing electricity, gas, and innovative solutions for businesses to enhance energy efficiency and use renewable sources |
40 |
| 30 | 37 | |
| 31 | 35 | |
| 32 |
FastWayfastway.energy
Develops a nationwide fast and ultra-fast electric vehicle charging network to accelerate decarbonization and transition to sustainable mobility for all. |
30 |
| 33 |
Engie Program s.r.l.engie.it
The company offers facility management, energy efficiency, requalification of sports facilities, and installation of various systems in the sports sector |
20 |
| 34 |
Theia Investments (acquired by Stafford Capital Partners)theia.energy
Holding company acquiring, managing European renewable energy assets, focusing on operational and financial optimization with institutional investor backing. |
6 |
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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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