| # | Company | Employees |
|---|---|---|
| 1 |
Wiener Stadtwerke GmbHwienerstadtwerke.at
The company group in Vienna ensures reliable energy, mobility, and public services while actively pursuing a sustainable climate transition with innovative solutions |
15,000 |
| 2 |
University of Viennaunivie.ac.at
A large employer in Vienna with 10,000 employees, the University works on research and teaching projects, offering flexible hours and international opportunities Apply now! |
7,475 |
| 3 |
ÖBBholding.oebb.at
With 13 million daily passengers and 1,300 freight trains, ÖBB is a leading Austrian employer with over 42,000 employees and 2,000 apprentices |
7,419 |
| 4 |
Technische Universität Wientuwien.at
Leading educational institution in Austria specializing in science and technology Focused on developing scientific excellence and enhancing comprehensive competence through research and teaching |
4,651 |
| 5 |
Medical University of Viennameduniwien.ac.at
Leading medical education and research institution in Europe with a focus on training students, conducting cutting-edge research, and providing advanced patient care Apply to join now |
4,057 |
| 6 |
International Atomic Energy Agency (IAEA)iaea.org
An international organization promoting safe, secure, and peaceful use of nuclear technologies through collaboration with Member States and global partners |
3,731 |
| 7 | 2,705 | |
| 8 |
WU (Vienna University of Economics and Business)wu.ac.at
Leading academic institution for business and economics education, fostering contemplation, creativity, and pioneering research to enhance economic capability and social prosperity. |
2,647 |
| 9 |
AMS (Arbeitsmarktservice)ams.at
Leading Austrian labor market service advising over 200,000 companies on personnel matters, providing updates, insights, and detailed regional consultations. |
1,998 |
| 10 |
Wiener Linienwienerlinien.at
Providing climate-friendly public transportation services in Vienna, ensuring quality, innovation, and diverse roles for efficient urban mobility. |
1,973 |
| 11 |
Bildungsdirektion für Wienbildung-wien.gv.at
Official page of the Education Directorate for Vienna Provides support and guidance for students, parents, and teachers on school-related matters and educational opportunities |
1,878 |
| 12 |
University of Natural Resources and Life Sciences, Vienna (BOKU)boku.ac.at
A European university focused on life sciences and sustainable development, driving innovation for a green economy through collaboration with research, education, and society |
1,749 |
| 13 | 1,560 | |
| 14 |
Wien Energie GmbHwienenergie.at
Largest regional energy provider, supplying two million people with eco-friendly power, cooling, heating, electromobility, and telecommunications. Invests in renewables and electromobility. |
1,557 |
| 15 |
VERBUNDverbund.com
A leading European utility company focused on renewable energy, primarily hydroelectricity, with operations in electricity generation, transmission, trading, and sales |
1,336 |
| 16 |
Wiener Gesundheitsverbundkarriere.gesundheitsverbund.at
A healthcare provider with 30,000 employees offering 24/7 care for patients and residents in Vienna, with 8 hospitals, 9 nursing homes, and a therapy center |
1,325 |
| 17 | 1,271 | |
| 18 |
Pensionsversicherungpv.at
The largest pension insurance provider in Austria, with 6,500 employees serving 35 million insured individuals and paying out over 19 million pensions nationwide |
1,211 |
| 19 |
AIT Austrian Institute of Technologyait.ac.at
Austria's largest RTO specializing in key infrastructure issues, researches and develops technologies for industry and public institutions, with government and industry shareholders |
1,191 |
| 20 |
AUVA - Allgemeine Unfallversicherungsanstaltauva.at
This company provides social insurance for occupational risks, offering prevention, medical care, treatment, rehabilitation, compensation, and research for employees and students |
1,136 |
| 21 |
Universitätsklinikum AKH Wienakhwien.at
The company is the largest hospital in Austria, treating around 60,000 inpatients and over 11 million outpatients annually with a diverse staff |
1,080 |
| 22 |
Austrian Federal Computing Centrebrz.gv.at
A leading IT service provider for the Austrian federal administration, specializing in e-government solutions |
1,060 |
| 23 |
Österreichische Gesundheitskasseoegk.at
The largest social health insurance in Austria, providing equal access to healthcare for 76 million insured individuals through various services and a respectful work environment |
935 |
| 24 |
ASFINAGasfinag.at
The company is a reliable, innovative, and sustainable mobility partner in Austria, investing in eco-friendly solutions for generations to come They provide safe highways and digital services |
892 |
| 25 |
Oesterreichische Nationalbankoenb.at
The central bank of Austria within the Eurosystem, contributing to monetary policy, financial stability, cash supply, reserve asset management, economic analysis, and payment system oversight |
775 |
| 26 |
FFG Austrian Research Promotion Agencyffg.at
National funding institution supporting applied research, development, and innovation in Austria Provides services for enterprises, research institutions, and researchers Promotes integration into European programs |
751 |
| 27 |
Austrian Agency for Health and Food Safetyages.at
Austrian government-owned agency providing expert scientific support for public health, food safety, veterinary examinations, pharmaceutical evaluation, risk management, and more |
671 |
| 28 |
Vetmedunivetmeduni.ac.at
The company is the only veterinary education and research institution in Austria, focusing on animal health, preventive veterinary medicine, and societal issues related to animals |
664 |
| 29 |
Austrian Academy of Sciences - Österreichische Akademie der Wissenschaften (ÖAW)oeaw.ac.at
Austria's leading non-university research institution promoting science through innovative research, interdisciplinary exchange, talent support, knowledge dissemination, and international scientific cooperation |
637 |
| 30 |
WienIT GmbHwienit.at
Digitizing and innovating the operations of Vienna's municipal services through IT solutions, driving forward the city's infrastructure and services for a smarter future |
597 |
| 31 |
ADVANTAGE AUSTRIAadvantageaustria.org
Official trade promotion organization providing intelligence, business development services, and international business opportunities to Austrian and international companies worldwide Promoting products/services and investment in Austria |
558 |
| 32 |
Vienna Chamber of Commerce and Industrywko.at
Advocacy organization in Vienna representing 138,000 companies across 100 different branches to provide optimal framework for their interests |
425 |
| 33 |
Sozialversicherung der Selbständigensvs.at
The SVS provides social security, health and pension benefits, and digital services for self-employed individuals in Austria through a self-managed organization |
278 |
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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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