Allholding Beteiligungsverwaltungs GmbH

is the holding company that bundles all of the Michael Gröller family’s entrepreneurial activities.
We have structured our corporate divisions in our subsidiaries:

Allmobil Immobilien GmbH sees itself as an active real estate portfolio holder and specializes in the management and further development of Viennese residential real estate. Properties are constantly being purchased and further developed here.

Allinvest Unternehmensbeteiligungs GmbH sees itself as an entrepreneurial investor for equity investments. Allinvest also works as a management consultant on strategic corporate issues, financing issues and real estate-specific issues for family businesses, family offices and private foundations.


Allmobil Immobilien GmbH was founded in 2004. Since then, investments have only been made in the real estate asset class in Vienna (“Wiener Zinshaus”). For this purpose, both individual properties were acquired via asset deals and entire property portfolios as share deals. A key focus is on the continuous development of the portfolio through targeted investments in the maintenance and improvement of apartments and general parts of the properties. The creation of new space through extensions and attic conversions will also be promoted where appropriate. We consider ourselves as a long term investor and therefore reinvest all rental proceeds into the development of the portfolio. Depending on the situation, individual properties and entire property portfolios are purchased and, if necessary, sold, with the aim of achieving a stable or slightly increasing amount of space.


Allinvest Unternehmensbeteiligungs GmbH was founded in 2006 to bundle the diverse company investments of the Gröller family. It sees itself as an active entrepreneurial investor. Investments are made in the areas of buy-outs, growth and opportunity investments. The aim is to achieve a broad diversification of investments in various industrial sectors.

Allinvest also works as a management consultant on strategic corporate issues, financing issues and real estate-specific issues for family businesses, family offices and private foundations.

Details about Allinvest’s activities and investments can be found at

Michael Gröller Foundation

Michael Gröller Foundation

Our father, Michael Gröller, laid the foundation of our family office with hard work, courage, perseverance, thrift and an absolute handshake quality. We are aware of this heritage and strive to live these values ​​ourselves and pass them on to the coming generation.

But we are also aware that success is never based solely on one’s own work, but also requires the necessary luck and the right social conditions. We therefore feel obliged to give something back to society.

For this purpose we created the Michael Groeller Foundation. We assume our social responsibility under this brand. We are committed to using a substantial portion of our annual increase in value for charitable projects.

The focus is on supporting social projects. We also support cultural and educational projects and research institutions.

Details about supported projects can be found at:


Dipl. Ing. ETH Heinrich Gröller

Managing Director

Dipl. Ing. ETH Heinrich Gröller

After graduating as a qualified business and production engineer from the Swiss Federal Institute of Technology in Zurich, Heinrich Gröller started his professional career in 2001 as a management consultant at Roland Berger Strategy Consultants in the corporate restructuring area. He then co-founded a production plant for wooden pallets in the Czech Republic before taking over the management of the Austrian technology company Schiebel Elektronik Geräte GmbH. Here he led the development of the Camcopter S-100 (Unmanned Aerial Vehicle System) business unit, which increased the company’s sales tenfold in just 3 years. He has led the Allholding Group since 2007 and also manages numerous operational subsidiaries. Since 2018 he has been an operating partner at Speedinvest, a pan-European early stage venture capital manager, where he is part of the Climate & Industrial Tech team.

At the same time, he was chairman of the Young Industry Vienna and deputy federal chairman of the Junge Industrie for several years and sits on the board of the Federation of Austrian Industries, Vienna and the board of Agenda Austria.


Dkfm. Michael Gröller

As a qualified business graduate from the University of World Trade in Vienna, Michael Gröller began his career in 1966 at the Mayr Melnhof cardboard factory, where he was promoted to general director and, after a successful IPO, to CEO. From 2001 to 2015 he accompanied Mayr Melnhof Karton AG as chairman of the supervisory board. He was and is a member of numerous other supervisory boards, including RHI AG, Greco International AG, Nettingsdorfer Papier AG, Allianz Österreich AG and Bankhaus Krentschker AG. He was also president of Austropapier, president of the umbrella organization of the European paper industry and for many years on the board of the Federation of Austrian Industries.