| # | Company | Employees |
|---|---|---|
| 1 |
Bosch Home Comfort Groupbosch-homecomfortgroup.com
The company specializes in creating innovative sustainable heating, cooling, and well-being solutions to enhance lifestyles for a smarter future |
4,606 |
| 2 |
Viessmann Climate Solutionsviessmann-climatesolutions.com
Leading provider of climate and renewable energy solutions, specializing in heating, water, and air quality technologies since 1917 Creating sustainable living spaces |
3,115 |
| 3 |
SGL Carbonsglcarbon.com
Global leader in carbon-based solutions for industries such as automotive, semiconductor, energy, and chemicals Committed to sustainability and innovation |
2,079 |
| 4 |
Techem Energy Services GmbHtechem.com
Global energy service provider promoting awareness of energy and water consumption for real estate sector and homeowners in over 20 countries Over 3,500 employees worldwide |
1,442 |
| 5 |
Bosch Thermotechnik GmbHbosch-homecomfort.com
A global leader specializing in providing advanced thermotechnology solutions aimed at enhancing home comfort through innovative heating and cooling products |
1,253 |
| 6 |
Süwag Energie AGsuewag.com
The company focuses on producing and distributing energy in an environmentally friendly way, promoting energy efficiency, and collaborating with communal partners for power generation |
1,158 |
| 7 |
Mainova AGmainova.de
Leading Frankfurt energy service provider supplying electricity, gas, heat, and water while offering renewable energy, electromobility, and infrastructure for climate neutrality. |
1,065 |
| 8 |
Wintershall Deawintershalldea.com
A leading European gas and oil company transitioning to focus on gas, carbon management, and low carbon hydrogen projects globally |
1,026 |
| 9 |
ABO Energyaboenergy.com
Development, engineering, construction, and maintenance of wind, solar, hybrid energy, battery storage, and hydrogen projects worldwide. |
918 |
| 10 |
Infraserv GmbH & Co. Höchst KGinfraserv.com
Infraserv Höchst provides comprehensive solutions for chemical and pharmaceutical companies, offering services in energy supply, waste management, facility management, and more |
862 |
| 11 |
Messer SE & Co. KGaAmessergroup.com
Supplier of industrial, medical, and specialty gases with customized solutions supporting safety, sustainability, and innovation across multiple industries worldwide. |
798 |
| 12 | 744 | |
| 13 | 696 | |
| 14 |
AVL in Germanyavl.com
A global leader in mobility technology, AVL develops, tests, and simulates solutions for automotive and other industries, focusing on electrification, software, AI, and automation |
613 |
| 15 |
SBS Ecoclean Groupecoclean-group.net
Innovative global leader in providing efficient and sustainable solutions for industrial parts cleaning, surface processing, and green hydrogen generation |
578 |
| 16 | 480 | |
| 17 |
SVOLT Energy Technology (Europe) GmbHsvolt.cn
Development and production of lithium battery materials, cells, modules, packs, management systems, and energy storage products globally. |
410 |
| 18 |
CNGR Advanced Materialcngr.eu
A global supplier of energy materials for lithium batteries, focusing on technological innovation, energy efficiency, and sustainability through precursor production and recycling |
390 |
| 19 |
TRACTEBEL [Germany]tractebel-engie.de
A leading consulting engineering company offering services in energy, hydropower, water resources, water supply, wastewater management, building, and transportation sectors globally |
372 |
| 20 |
Fraunhofer IEEiee.fraunhofer.de
Research institute focused on developing technical and economic solutions for the global transition to renewable energy and ensuring grid stability |
315 |
| 21 |
DB Energie GmbHdbenergie.de
A utilities company in Frankfurt, Germany, specializing in energy services and solutions |
311 |
| 22 |
Haltermann Carlesshaltermann-carless.com
A leading international supplier of high-value hydrocarbon-based specialty products and solvents, providing sustainable solutions for various industries with a focus on renewable resources |
222 |
| 23 |
MAINGAU Energie GmbHmaingau-energie.de
A forward-thinking company offering E-mobility, online shopping, telecommunications, and energy services to 500,000 customers, with a focus on innovation and motivated team members |
202 |
| 24 |
ABO Windaboenergy.com
Development and management of renewable energy projects across Europe, expanding technology range beyond wind to include diverse sustainable solutions. |
186 |
| 25 |
SMA Altensosma-altenso.com
A company specializing in PV-hybrid projects, large scale storage applications, and power-to-gas plants, leveraging over 30 years of industry expertise |
120 |
| 26 |
Cummins Deutschland GmbHcummins.com
The company is a German subsidiary that operates in the manufacturing and distribution of engines, power generation systems, and related technologies |
108 |
| 27 |
Chargemaker GmbHchargemaker.de
Supports real estate, companies, and hotels nationwide with planning, conceptualization, and operation of charging infrastructure for electromobility and energy management. |
42 |
| 28 |
RAEDIANraedian.com
Innovators in electric vehicle charging. Research, development, manufacturing, sales, and localization services. Integrating intelligent hardware, software, and service for sustainable transportation. |
30 |
| 29 |
StarCharge Europestarcharge.com
Pioneer in electric vehicle charging, offering diverse intelligent and reliable charging and energy solutions, including AC/DC chargers, residential, commercial, industrial, and grid-scale options, with cloud platforms. |
18 |
| 30 |
ITM Power Germany GmbHitm-power.com
Manufactures integrated hydrogen energy solutions to optimize the use of renewable energy sources |
9 |
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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 Nov 2, 2026.
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