This selection of corporate groups in Vienna includes established large enterprises and some younger firms. The industries represented include utilities, telecommunications, insurance, and manufacturing. Noteworthy companies include Wiener Stadtwerke GmbH, which provides energy and public services; A1 Telekom Austria Group, a digital services provider; Mondi Group, a global packaging and paper company; and UNIQA Insurance Group, an insurance provider for private and corporate clients.
A recurring theme among these companies is their focus on sustainable solutions and digital transformation. Many operate across Austria and Central and Eastern Europe, indicating a regional market focus for these Vienna-headquartered groups.
| # | 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 |
A1 Telekom Austria Groupa1.group
Leading digital services and communications provider in Central and Eastern Europe, enabling connectivity, digital business, and lifestyle for over 24 million users. |
12,320 | |||
| 3 |
Mondi Grouplinktr.ee
Global integrated company managing forests, producing pulp, paper, plastic films, and manufacturing sustainable industrial and consumer packaging solutions. |
9,160 | |||
| 4 |
UNIQA Insurance Groupuniqagroup.com
Insurance provider for private and corporate clients across Austria and Central and Eastern Europe, offering risk protection and community support. |
8,256 | |||
| 5 |
脰BBholding.oebb.at
With 13 million daily passengers and 1,300 freight trains, 脰BB is a leading Austrian employer with over 42,000 employees and 2,000 apprentices |
7,419 | |||
| 6 | 6,877 | ||||
| 7 |
PORR Groupporr-group.com
Large European construction company specializing in building, civil engineering, and infrastructure services across multiple countries and international markets. |
6,454 | |||
| 8 |
DO & CO AGdoco.com
An Austrian company offering gourmet entertainment worldwide through Airline Catering, Event Catering, and Restaurants, dedicated to delivering exceptional quality and service |
4,937 | |||
| 9 |
GoStudentgostudent.org
Leading hybrid tutoring company combining online and offline education services to support millions of families and unlock children's potential. |
2,718 | |||
| 10 |
Frequentisfrequentis.com
An international supplier of communication and information systems for control centers with safety-critical tasks in air traffic management and public safety & transport sectors |
2,573 | |||
| 11 |
Kapsch Groupkapsch.net
Global technology corporation with a focus on innovation and customer satisfaction, investing in research and development to bring new solutions to market |
1,743 | |||
| 12 |
Addiko Bank AGaddiko.com
A consumer and SME specialist banking group in CSEE, offering unsecured personal loans, working capital loans, and payment services |
1,634 | |||
| 13 |
Prinzhorn Groupprinzhorngroup.com
European market leader in packaging, paper, and recycling industry with 10,000 employees across 16 countries, specializing in corrugated packaging, containerboard production, and recycling |
1,575 | |||
| 14 |
Kapsch TrafficCom AGkapsch.net
Provider of innovative tolling and traffic management solutions, covering design, implementation, and operation for sustainable mobility worldwide. |
1,345 | |||
| 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 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
CANCOM Austriacancom.at
Leading ICT service provider & digitalization partner in Austria with expertise in collaboration, networking, and IT technology Offers software solutions and smart workplace services |
1,084 | |||
| 17 |
SEMPERIT AGsemperitgroup.com
Development, production, and marketing of specialized polymer and plastic products including hoses, conveyor belts, and construction profiles worldwide. |
1,073 | |||
| 18 |
Constantia Industries AGciag.at
An industrial holding company active in construction, furniture, sports goods, aviation, and energy management, aiming to expand into new B2B sectors |
1,020 | |||
| 19 |
FMTG | Falkensteiner Michaeler Tourism Groupfalkensteiner.com
Hospitality group offering diverse jobs, training, and career advancement opportunities Focus on creating a welcoming environment for guests and employees |
976 | |||
| 20 |
PKEpke-group.com
A trailblazing European company specializing in security, communication, media, engineering, and facility management with a track record of outstanding results on large-scale projects |
961 | |||
| 21 |
TTTECHtttech.com
Provides safe, secure, networked computing platforms for industries like aviation, space, manufacturing, and energy, enabling autonomous systems through continuous innovation. |
825 | |||
| 22 |
WITTMANN Groupwittmann-group.com
Manufacturing injection molding machines, robots, and auxiliary equipment for plastic processing, specializing in energy-efficient technology and material handling for smart factory production cells. |
805 | |||
| 23 |
Generali Austriagenerali.at
A leading insurance company with a focus on motor vehicle insurance, sustainable growth, international presence, innovation, employee trust, and continuous learning and development opportunities |
730 | |||
| 24 |
Plasser & Theurer Export von Bahnbaumaschinen G.m.b.H.plassertheurer.com
Manufacture and supply of diverse railway track maintenance machines, offering worldwide service, training, spare parts, and technical support. |
688 | |||
| 25 |
AOP Healthaop-health.com
A European pioneer in integrated therapies for rare diseases and critical care, focusing on research, development, and global sales of innovative treatment solutions |
611 | |||
| 26 |
Kapsch TrafficCom North Americakapsch.net
Provider of innovative tolling and traffic management solutions, covering design, implementation, and operation for sustainable mobility worldwide. |
588 | |||
| 27 |
Raiffeisen Informatik GmbH & Co KGraiffeiseninformatik.at
A leading Austrian IT services provider offering data center operations, security services, software consulting, and banking solutions for over 50 years |
586 | |||
| 28 |
Ratner Companiesfast.khu-ed.edu.mn
A chain of hair salons that is no longer in business, previously operated by Ratner Companies |
534 | |||
| 29 |
BIG Bundesimmobiliengesellschaft m.b.H.big.at
The company develops and manages living and working spaces, focusing on public infrastructure properties, office and residential buildings, and integrated urban development projects |
487 | |||
| 30 |
Frauenthal Handel Gruppe AGfrauenthal-jobs.at
The company focuses on strengthening independent sales organizations through a comprehensive and flexible service approach, including logistics, product management, IT, marketing, and more |
459 | |||
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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 Nov 11, 2026.
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