Claus-Dieter Wollnik

Holtzbrinck Digital GmbH (Holtzbrinck Digital) is the strategic investment subsidiary of Verlagsgruppe Georg von Holtzbrinck GmbH in Germany. Formerly known as Holtzbrinck Networks GmbH, the firm originated in 2000 when all internet investments from the Verlagsgruppe von Holtzbrinck were consolidated to form Holtzbrinck NetworXs AG, which was subsequently split into Holtzbrinck Networks GmbH and Holtzbrinck Ventures GmbH in 2006. Located in Munich, Holtzbrinck Digital aims to develop new areas of business on the Web by managing interests in Internet companies and acquiring start-ups. From their experience as a venture partner helping to build B2C Internet companies, the firm has unique knowledge of how to build brands, win customers and handle regional expansion. They invest from the balance sheet of the parent company.

epubli GmbH operates an Internet portal for self-publishing and print-on-demand. The firm's publishing's include family & kids stories, organizers, pocket book and editions, travel brochures and catalogues. It allows new authors, publishers, private and business clients to publish and market their publishing in small editions. The business also operates online shopping portal, gift shops and stores in airports, centers, cinema halls and railway stations. The company was founded in 2008 and is headquartered in Berlin, Germany.

Definiens AG is a holding company, which engages in the development and market of biomedical imaging and data analysis software solutions. The firm specializes in the design and manufacture of imaging software suites for drug discovery, development, and diagnostics applications. It engages in the custom image analysis projects for the biopharmaceutical industry, spanning drug discovery, translational research, and clinical research. It offers image analysis processing, integration and deployment, planning, and consulting services. The company was founded by Gerd Binnig in 1994 and is headquartered in Munich, Germany.

Muenchner Kreis operates an independent platform which provides orientation for decision makers. It analyzes future developments, providing impulses on the technical, economic, political, and social challenges of the digital transformation. The company is headquartered in Munich, Germany.

Money.pl Sp zoo operates internet portals providing business and financial information. It publishes news related to finance, law, employment, real estate, economy, and politics. The company was founded in 2000 and is headquartered in Wroclaw, Poland.

Pointoo GmbH operates as an internet community. The private company is based in Munich, Germany.

Spotlight Verlag GmbH engages in the publishing and distribution of foreign language magazines. It distributes its products under the Spotlight, Business Spotlight, ADESSO, ECOS, Écoute, and Deutsch perfekt brands. The company was founded in 1981 and is headquartered in Planegg, Germany.

Prognos AG provides business consulting services. ITs expertise includes, technology and innovation, energy and climate protection and management consulting. The company was founded in 1959 and is headquartered in Basel, Switzerland.

Ratgeber Netzwerk GmbH engages in the development, operation, and marketing of digital platforms with content related to knowledge and counseling. The company was founded on October 5, 2005 and is headquartered in Munich, Germany.

gutefrage.net GmbH owns and operates a question-answer portal which features functionality such as comments, preview, polls, editing of contributions, APIs, and a graphical charter. The company was founded in 2006 and is headquartered in Munich, Germany.

Part of Verlagsgruppe Georg von Holtzbrinck GmbH, Georg von Holtzbrinck GmbH & Co. KG is a German company that provides administrative and management services. The company is based in Stuttgart, Germany. The CEO of the company is Stefan von Holtzbrinck.

Poolworks (Germany) Ltd. provides online information services for students. The company was founded by Ehssan Dariani, Dennis Bemmann, Lukasz Gadowski and Jonathan Teklu in October 2005 and is headquartered in Berlin, Germany.

Searchmetrics GmbH operates as a digital marketing software and services company. It provides an enterprise level search engine optimization platform for companies and online marketing agencies which offers a consulting approach to companies and online agencies, long-term digital marketing strategies encompassing SEO, content, and inbound marketing and social media. The company was founded by Marcus Tober in 2005 and is headquartered in Berlin, Germany.

Aeroco Aircraft Engineering provides mechanical engineering services. The private company is based in Wroclaw, Poland.

MyHammer AG engages in the development and operation of an online search portal for skilled workers and service providers. It enables users to find specialists based on the required services. The company was founded in 2005 and is headquartered in Berlin, Germany.

meinestadt.de GmbH is one of Germany's leading Internet media company. It operates and market reaches several Internet portals. The firm operates and market reaches several Internet portals. These include meinestadt.de, meineleute.de, allesklar.de and DatingCafe.de. They have in common the focus on regional and local content. Local information for most people has a high utility value and are also for each of high emotional importance. The company is headquartered in Siegburg near Cologne. The company was founded in 1996 and is still majority owned by the family Stegger. The company currently employs around 300 staff. Since January 2006, the publishing group Georg von Holtzbrinck, with a minority share in the allesklar.com AG is involved.

Part of Verlagsgruppe Georg von Holtzbrinck GmbH, Holtzbrinck Digital Incubation GmbH operates an internet portal. The company is based in Munich, Germany. Markus Schunk has been the CEO of the German company since 2007.

Part of Verlagsgruppe Georg von Holtzbrinck GmbH, Holtzbrinck Digital Strategy GmbH operates as a holding German company with interests in digital and online publishing businesses. The company is based in Munich, Germany. The company was founded in 1999. The CEO is Markus Schunk.

NetDoktor.de GmbH operates as an information portal about health and medicine. It offers medical information on major diseases, symptoms, tests, and medications. The company was founded by Carl J. Brandt and Rune Nygaard Bech Pedersen in 1999 and is headquartered in Munich, Germany.

Verlagsgruppe Georg von Holtzbrinck GmbH operates as an investment holding company with interests in publishing books, newspapers, periodicals and online media. Its customers include authors, researchers, academics, educators, librarians, and readers. The company was founded in 1971 and is headquartered in Stuttgart, Germany.

HRworks GmbH engages in the development of a software product used in human resource management. It offers various functionalities for personnel, working time, and business travel management as well as corporate benefits. These include compliance and applicant management, digital personal files, employment contract generator, travel expense accounting, absence management, and time tracking. The company was founded by Thomas Holzer in 1998 and is headquartered in Freiburg, Germany.