# List of corporate groups and holding companies in Vienna

Tamtam tracks 47 corporate groups and holding companies headquartered in Vienna. This list ranks the 30 largest by number of employees on LinkedIn, led by Wiener Stadtwerke GmbH, A1 Telekom Austria Group and Mondi Group. Their median headcount is 1,336. Half of them were founded in 1957 or later.

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.

🇦🇹 Vienna · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Wiener Stadtwerke GmbH](https://www.tamtam.ai/c/wiener-stadtwerke-gmbh) (wienerstadtwerke.at)<br>The company group in Vienna ensures reliable energy, mobility, and public services while actively pursuing a sustainable climate transition with innovative solutions | Utilities | 🇦🇹 Vienna | 15,000 |  |
| 2 | [A1 Telekom Austria Group](https://www.tamtam.ai/c/a1-telekom-austria-group) (a1.group)<br>Leading digital services and communications provider in Central and Eastern Europe, enabling connectivity, digital business, and lifestyle for over 24 million users. | Telecommunications | 🇦🇹 Vienna | 12,320 | 1887 |
| 3 | [Mondi Group](https://www.tamtam.ai/c/mondi-group) (linktr.ee)<br>Global integrated company managing forests, producing pulp, paper, plastic films, and manufacturing sustainable industrial and consumer packaging solutions. | Packaging and Containers Manufacturing | 🇦🇹 Vienna | 9,160 |  |
| 4 | [UNIQA Insurance Group](https://www.tamtam.ai/c/uniqa-insurance-group) (uniqagroup.com)<br>Insurance provider for private and corporate clients across Austria and Central and Eastern Europe, offering risk protection and community support. | Insurance | 🇦🇹 Vienna | 8,256 |  |
| 5 | [ÖBB](https://www.tamtam.ai/c/obb) (holding.oebb.at)<br>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 | Rail Transportation | 🇦🇹 Vienna | 7,419 |  |
| 6 | [OMV](https://www.tamtam.ai/c/omv) (omv.com)<br>A leading sustainable fuels, chemicals, and materials company focusing on circular economy solutions, transitioning to low-carbon businesses to achieve net zero emissions by 2050 | Utilities | 🇦🇹 Vienna | 6,877 | 1956 |
| 7 | [PORR Group](https://www.tamtam.ai/c/porr-group) (porr-group.com)<br>Large European construction company specializing in building, civil engineering, and infrastructure services across multiple countries and international markets. | Construction | 🇦🇹 Vienna | 6,454 |  |
| 8 | [DO & CO AG](https://www.tamtam.ai/c/do-and-co-ag) (doco.com)<br>An Austrian company offering gourmet entertainment worldwide through Airline Catering, Event Catering, and Restaurants, dedicated to delivering exceptional quality and service | Hospitality | 🇦🇹 Vienna | 4,937 | 1981 |
| 9 | [GoStudent](https://www.tamtam.ai/c/gostudent) (gostudent.org)<br>Leading hybrid tutoring company combining online and offline education services to support millions of families and unlock children's potential. | Education Administration Programs | 🇦🇹 Vienna | 2,718 | 2016 |
| 10 | [Frequentis](https://www.tamtam.ai/c/frequentis) (frequentis.com)<br>An international supplier of communication and information systems for control centers with safety-critical tasks in air traffic management and public safety & transport sectors | IT Services and IT Consulting | 🇦🇹 Vienna | 2,573 |  |
| 11 | [Kapsch Group](https://www.tamtam.ai/c/kapsch-group) (kapsch.net)<br>Global technology corporation with a focus on innovation and customer satisfaction, investing in research and development to bring new solutions to market | IT Services and IT Consulting | 🇦🇹 Vienna | 1,743 |  |
| 12 | [Addiko Bank AG](https://www.tamtam.ai/c/addiko-bank-ag) (addiko.com)<br>A consumer and SME specialist banking group in CSEE, offering unsecured personal loans, working capital loans, and payment services | Banking | 🇦🇹 Vienna | 1,634 |  |
| 13 | [Prinzhorn Group](https://www.tamtam.ai/c/prinzhorn-group) (prinzhorngroup.com)<br>European market leader in packaging, paper, and recycling industry with 10,000 employees across 16 countries, specializing in corrugated packaging, containerboard production, and recycling | Packaging and Containers Manufacturing | 🇦🇹 Vienna | 1,575 | 1853 |
| 14 | [Kapsch TrafficCom AG](https://www.tamtam.ai/c/kapsch-trafficcom-ag) (kapsch.net)<br>Provider of innovative tolling and traffic management solutions, covering design, implementation, and operation for sustainable mobility worldwide. | IT Services and IT Consulting | 🇦🇹 Vienna | 1,345 | 2002 |
| 15 | [VERBUND](https://www.tamtam.ai/c/verbund) (verbund.com)<br>A leading European utility company focused on renewable energy, primarily hydroelectricity, with operations in electricity generation, transmission, trading, and sales | Utilities | 🇦🇹 Vienna | 1,336 | 1947 |
| 16 | [CANCOM Austria](https://www.tamtam.ai/c/cancom-austria) (cancom.at)<br>Leading ICT service provider & digitalization partner in Austria with expertise in collaboration, networking, and IT technology Offers software solutions and smart workplace services | IT Services and IT Consulting | 🇦🇹 Vienna | 1,084 |  |
| 17 | [SEMPERIT AG](https://www.tamtam.ai/c/semperit-ag) (semperitgroup.com)<br>Development, production, and marketing of specialized polymer and plastic products including hoses, conveyor belts, and construction profiles worldwide. | Chemical Manufacturing | 🇦🇹 Vienna | 1,073 | 1824 |
| 18 | [Constantia Industries AG](https://www.tamtam.ai/c/constantia-industries-ag) (ciag.at)<br>An industrial holding company active in construction, furniture, sports goods, aviation, and energy management, aiming to expand into new B2B sectors | Plastics Manufacturing | 🇦🇹 Vienna | 1,020 | 1949 |
| 19 | [FMTG \| Falkensteiner Michaeler Tourism Group](https://www.tamtam.ai/c/fmtg-falkensteiner-michaeler-tourism-group) (falkensteiner.com)<br>Hospitality group offering diverse jobs, training, and career advancement opportunities Focus on creating a welcoming environment for guests and employees | Hospitality | 🇦🇹 Vienna | 976 | 1957 |
| 20 | [PKE](https://www.tamtam.ai/c/pke) (pke-group.com)<br>A trailblazing European company specializing in security, communication, media, engineering, and facility management with a track record of outstanding results on large-scale projects | Holding Companies | 🇦🇹 Vienna | 961 | 1979 |
| 21 | [TTTECH](https://www.tamtam.ai/c/tttech) (tttech.com)<br>Provides safe, secure, networked computing platforms for industries like aviation, space, manufacturing, and energy, enabling autonomous systems through continuous innovation. | Computer Networking Products | 🇦🇹 Vienna | 825 |  |
| 22 | [WITTMANN Group](https://www.tamtam.ai/c/wittmann-group) (wittmann-group.com)<br>Manufacturing injection molding machines, robots, and auxiliary equipment for plastic processing, specializing in energy-efficient technology and material handling for smart factory production cells. | Machinery Manufacturing | 🇦🇹 Vienna | 805 | 1976 |
| 23 | [Generali Austria](https://www.tamtam.ai/c/generali-austria) (generali.at)<br>A leading insurance company with a focus on motor vehicle insurance, sustainable growth, international presence, innovation, employee trust, and continuous learning and development opportunities | Insurance | 🇦🇹 Vienna | 730 | 1832 |
| 24 | [Plasser & Theurer Export von Bahnbaumaschinen G.m.b.H.](https://www.tamtam.ai/c/plasser-and-theurer-export-von-bahnbaumaschinen-g-m-b-h) (plassertheurer.com)<br>Manufacture and supply of diverse railway track maintenance machines, offering worldwide service, training, spare parts, and technical support. | Machinery Manufacturing | 🇦🇹 Vienna | 688 | 1953 |
| 25 | [AOP Health](https://www.tamtam.ai/c/aop-health) (aop-health.com)<br>A European pioneer in integrated therapies for rare diseases and critical care, focusing on research, development, and global sales of innovative treatment solutions | Pharmaceutical Manufacturing | 🇦🇹 Vienna | 611 | 1996 |
| 26 | [Kapsch TrafficCom North America](https://www.tamtam.ai/c/kapsch-trafficcom-north-america) (kapsch.net)<br>Provider of innovative tolling and traffic management solutions, covering design, implementation, and operation for sustainable mobility worldwide. | IT Services and IT Consulting | 🇦🇹 Vienna | 588 | 1892 |
| 27 | [Raiffeisen Informatik GmbH & Co KG](https://www.tamtam.ai/c/raiffeisen-informatik-gmbh-and-co-kg) (raiffeiseninformatik.at)<br>A leading Austrian IT services provider offering data center operations, security services, software consulting, and banking solutions for over 50 years | IT Services and IT Consulting | 🇦🇹 Vienna | 586 | 1969 |
| 28 | [Ratner Companies](https://www.tamtam.ai/c/ratner-companies) (fast.khu-ed.edu.mn)<br>A chain of hair salons that is no longer in business, previously operated by Ratner Companies | Retail | 🇦🇹 Vienna | 534 |  |
| 29 | [BIG Bundesimmobiliengesellschaft m.b.H.](https://www.tamtam.ai/c/big-bundesimmobiliengesellschaft-m-b-h) (big.at)<br>The company develops and manages living and working spaces, focusing on public infrastructure properties, office and residential buildings, and integrated urban development projects | Real Estate | 🇦🇹 Vienna | 487 | 1992 |
| 30 | [Frauenthal Handel Gruppe AG](https://www.tamtam.ai/c/frauenthal-handel-gruppe-ag) (frauenthal-jobs.at)<br>The company focuses on strengthening independent sales organizations through a comprehensive and flexible service approach, including logistics, product management, IT, marketing, and more | Wholesale | 🇦🇹 Vienna | 459 | 2017 |

## 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.

## More company lists in Vienna

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- [Software Development companies in Vienna](https://www.tamtam.ai/l/software-development-companies-vienna) (49)
- [Companies with a mobile app in Vienna](https://www.tamtam.ai/l/companies-with-mobile-app-vienna) (48)
- [Public sector organisations in Vienna](https://www.tamtam.ai/l/public-sector-organisations-vienna) (48)
- [Manufacturers in Vienna](https://www.tamtam.ai/l/manufacturers-vienna) (48)
- [Financial Services companies in Vienna](https://www.tamtam.ai/l/financial-services-companies-vienna) (47)
- [Retail chains in Vienna](https://www.tamtam.ai/l/retail-chains-vienna) (41)
- [IT services companies in Vienna](https://www.tamtam.ai/l/it-services-companies-vienna) (37)
- [Education providers in Vienna](https://www.tamtam.ai/l/education-companies-vienna) (36)
- [Professional services firms in Vienna](https://www.tamtam.ai/l/professional-services-firms-vienna) (35)
- [Publicly traded companies in Vienna](https://www.tamtam.ai/l/publicly-traded-companies-vienna) (29)
- [Hardware manufacturers in Vienna](https://www.tamtam.ai/l/hardware-companies-vienna) (27)
- [Consulting firms in Vienna](https://www.tamtam.ai/l/consulting-firms-vienna) (25)
- [Banking companies in Vienna](https://www.tamtam.ai/l/banking-companies-vienna) (25)

## The same list elsewhere in Austria

- [Corporate groups and holding companies in Austria](https://www.tamtam.ai/l/holding-companies-austria) (134)
- [Corporate groups and holding companies in Upper Austria](https://www.tamtam.ai/l/holding-companies-upper-austria) (31)

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Source: https://www.tamtam.ai/l/holding-companies-vienna