Allinvest Unternehmensbeteiligungs GmbH

was founded in 2006 as a subsidiary of Allholding Beteiligungsverwaltungs GmbH in order to bundle the diverse investments of the Gröller family. It sees itself as an active entrepreneurial investor. Direct investments in companies and real estate (outside the core business area of our sister company Allmobil Immobilien GmbH) are supplemented with a broad fund portfolio (PE, VC, alternatives) as well as stocks and bonds. The aim is to achieve a broad thematic and geographical diversification of investments.

Furthermore Allinvest works in management consulting on strategic corporate issues, financing and real estate issues for family businesses, family offices and private foundations.

Our Holdings

Allinvest invests in established companies that are looking for fresh capital as part of a corporate succession or growth strategy. We do not have a sector-specific or regional focus, but prefer classic industrial and technology companies. Our investment volumes per investment are in the single-digit million range, although larger volumes can also be realized by involving partners.

In contrast to the classic private equity investor, as a family business we have significantly more flexibility in contract design and the time horizon of our investments and can therefore develop tailor-made solutions with the entrepreneur/seller. We think entrepreneurially and not in terms of short-term value maximization. We are willing to actively participate in shaping our investments, but do not impose ourselves on the management on operational issues, but rather offer support where we can add value with our know-how and network.

We also have some start-up investments from the past. Since Heinrich Gröller joined Speedinvest as a partner in 2018, no new investments can be made in this area for compliance reasons.

Our Portfolio


Neoom AG

Neoom AG is a leading provider of innovative solutions for decentralized energy systems in Austria, Germany and Switzerland. Neoom equips private households and medium-sized companies with energy systems from a single source. All products are optimally coordinated with each other and enable the entire range of energy supply: From electricity production to storage to energy use – financing and insurance included.


Nawaro Energy Fund Beteiligung GmbH

Nawaro owns and operates agricultural land in Romania, partly on its own and partly on lease.


B2X Care Solutions GmbH

B2X is a global provider of hardware lifecycle management solutions for electronic devices. It’s shared services platform includes customer care services and carbon impact management. B2X is currently represented in around 35 countries with more than 700 employees.

cumulus Immobilien GmbH

Cumulus Immobilien GmbH

Cumulus Immobilien GmbH buys, develops and sells individual properties in Austria and Germany, with a focus on a short-term value enhancement strategy.



The Wefox platform allows customers, brokers and insurance companies to manage their insurance products digitally. 



The merger of Finnest, Invesdor and Kapilendo created the corporate financing platform for the 21st century. Invesdor finances both start-ups and established medium-sized companies. Both equity and debt-like instruments are available for this purpose. This allows private investors to invest directly in companies.



klarx – the digital construction machinery rental company – is a startup from Munich that operates the largest online platform for renting construction machinery and equipment. klarx brings together landlords and tenants of construction machinery across Germany. The company enables efficient rental in just a few clicks and shows the customer a transparent price including all logistics and insurance costs. Thanks to the largest network of rental partners, 100% availability can be guaranteed. With this digital full-service solution, klarx is revolutionizing the construction industry.


PROPSTER - der Sonderwunsch-Meister

Propster, based in Vienna and Munich, supports property developers and project developers with a B2B SaaS solution in the processing of special requests and marketing of their residential or office projects. The focus is on optimizing processes, communication and organization between buyers, tenants or investors and the property developer or project developer. Propster is integrated into the marketing of the projects and remains in use until the apartment is handed over and defects are managed.



refurbed is the fastest growing marketplace for renewed products in German-speaking countries. The products are up to 40% cheaper and more sustainable than new devices. Refurbed thus makes a substantial contribution to more sustainable use of resources.



Schüttflix is ​​the digital platform for connecting bulk material providers, logistics and the construction industry for materials and recycling.

Social Responsibility

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.

Among other things, we have supported the following projects in recent years:

IST Austria

Institute for Science and Technology

With an innovative concept based on the best research institutions in the world, the Institute for Science and Technology Austria has managed to take a leading position in basic research in just a few years. This has far-reaching effects on attracting talent and industrial investment to the region.

We have therefore supported the ISTA several times with substantial contributions to research funding.


Initiative for Teaching Entrepreneuship

The Initiative for Teaching Entrepreneuship has set itself the task of teaching young people entrepreneurial thinking and thereby making them designers of their future. The IFTE places particular emphasis on the development of programs that are integrated into the curricula and thus widely used.

We supported the IFTE not only monetarily but also through Heinrich Gröller’s many years of active participation on the association’s board.

Bauern helfen Bauern

Bauern helfen Bauern

Bauern helfen Bauern has been carrying out social projects since 1992, especially in Southeastern Europe.

As part of the reconstruction project after the earthquake in Croatia in spring 2021, we financed several houses there.

Verein Vinzenzgemeinschaft St. Stephan

The Vinzenzgemeinschaft St. Stephan association has been supporting homeless people in Vienna since 2003. In addition to an emergency shelter where up to 60 homeless people can be looked after every day, the association runs starter apartments for more than 60 people, as well as a restaurant with the aim of reintegrating homeless people into working life.

The association has been supported by Michael Gröller since its founding, both financially and as an active club board member.

Caritas - Du Wirhelfen


Caritas projects are continually supported.

Most recently, for example, the creation of refugee housing for Ukrainian refugees in Austria in 2022 and disaster relief in the context of the earthquake in Turkey in 2023.

Cafe Außergewöhnlich

Cafe Aussergewöhnlich

The 0⋅8⋅16 – everything but ordinary association for individual learning supports children and young people with special learning needs. It offers individual, holistic support and support for children in making the most of their own potential. Because every child, regardless of their talents or special needs, with or without restrictions, has a right to the greatest possible level of education.

We made a significant donation to support the opening of Cafe Extraordinary, a small, inclusive cafe where people with and without disabilities meet on an equal footing and work together.


We advise family businesses, family offices and private foundations in the following subject areas:


Dipl. Ing. ETH Heinrich Gröller

Managing Director

Dipl. Ing. ETH Heinrich Gröller

After graduating as a qualified engineer in Industrial Management and Manufacturing Engineering from the Swiss Federal Institute of Technology in Zurich (ETH Zürich), 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 Elektronische Geräte GmbH. Here he led the development of the Camcopter S-100 (Unmanned Aerial Vehicle System), 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, as part of the Climate & Industrial Tech team.

At the same time, he was chairman of the Young Industry Vienna and deputy federal chairman of Young Industry Austria for several years and sits on the board of the Federation of Austrian Industry, 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 Europapier (the umbrella organization of the European paper industry) and for many years on the board of the Federation of Austrian Industry.