2026 Lünendonk List: ISO-Gruppe Once Again Among the Top 10 Leading Mid-Sized IT Companies in Germany

The ranking is based on the key performance indicators of the entire ISO-Gruppe, which employs approximately 740 people at locations in Germany, Austria, Poland, and Canada. In a challenging market environment, this renewed ranking confirms the continuous growth and strong market position of the companies within the ISO-Gruppe.

Last year, the public services, medical technology, and tourism sectors contributed to the company’s stable business performance. Meanwhile, ISO is investing in future technologies and innovative solutions, especially artificial intelligence, industry-specific software, and platforms for complex business processes.

“This strong ranking in the top 10 demonstrates that the companies of the ISO-Gruppe are positioned for long-term success thanks to their combination of industry expertise, technological know-how, and high levels of competence in the areas of information security and cybersecurity,” explains Johannes Reichel, a member of the ISO-Gruppe’s Management Board.

About Lünendonk

Lünendonk is a German consulting and market research firm based in Mindelheim. Since 1983, Lünendonk has conducted systematic analyses of selected B2B service industries and companies. The company specializes in analyzing markets such as digital and IT services, management consulting, auditing, real estate services, human resources services, and continuing education. The well-known Lünendonk lists are provider rankings for major B2B service segments in Germany. These lists and the accompanying studies are based on extensive provider surveys and are considered important market barometers.

About the ISO-Gruppe

Since its founding in 1979, the ISO-Gruppe has established itself as a forward-looking and reliable partner in the IT world and is now an international IT service provider. The ISO-Gruppe brings together several strong and innovative companies under one roof, each operating in diverse business fields using a variety of technologies: from aviation and automation to medical technology and tourism, as well as Public Services and data quality.

With over 300 clients worldwide, approximately 740 employees, and revenue of 156 million euros (2025), the ISO-Gruppe has offices in several locations in Germany as well as in Austria, Poland, and Canada.

The companies of the ISO-Gruppe—ISO Software Systeme GmbH, ISO Travel Solutions GmbH, ISO Professional Services GmbH, and ISO Public Services GmbH—support the UN Global Compact and are certified to DIN EN ISO 9001:2015 at their locations in Nuremberg, Frankfurt am Main, and Munich.

In addition, ISO Recruiting Consultants GmbH (IRC) serves as a specialized staffing agency for IT professionals, expanding the ISO-Gruppe’s capabilities with proven expertise in IT recruiting.