Germany's leading Cybersecurity company
secunet makes sovereign digitalisation possible
In a future that constantly presents new technological opportunities and challenges, we show our customers ways and means for sovereign digitalisation. We enable them to competently and independently select the right set-up from state-of-the-art technologies and thus make work and communication in their organisations modern, yet trustworthy and secure.
For over 25 years, we have been the digital security partner for European governments, institutions and companies, ensuring their independence and data sovereignty with powerful infrastructures and security technologies. And we will continue to do so because we believe that sovereign digitalisation in an increasingly connected world remains an important prerequisite for the healthy growth of economies and the protection of our society.
Our Company Values:
genuine · cooperative · inquiring · open‑minded · proficient
Our 1,000+ “secunauts” are wholly committed to their work, open to change and always ready to take on new challenges. We all play our part in the success of secunet, and we are all committed to these communally defined values: they form the basis of our highly productive teamwork and show who we are.
We are honest in our dealings with each other and with our clients, and we take responsibility together. We can always rely on each other.
We work with and on behalf of other people, driven by a shared mission. We help and encourage each other – for our own benefit and for that of our clients and society in general.
From board level to trainee, we talk openly about mistakes and ask questions. Because that’s how we learn from each other and further our development.
We maintain strong relationships with our clients and achieve high-quality results on their behalf. We are able to achieve this by virtue of our experience, collaborative strengths and empathy for the needs of others.
Our desire for knowledge is one of our most important resources. We create the space in which to foster it. We try out new things and follow them through with passion to their logical conclusion.
How we live our values
Facts and Figures
secunet Security Networks AG comprises the divisions eHealth, Homeland Security, Industry, Public Authorities and Defense & Space. Our customers include federal ministries, more than 20 DAX-listed corporations, and many international authorities and organizations such as the EU Commission. We are IT security partner of the Federal Republic of Germany and partner of the Alliance for Cyber Security.
secunet was founded in 1997, is listed on the stock exchange and generated sales of around 406 million euros in 2024. Our main shareholder is Giesecke & Devrient GmbH.
Our locations in Germany
secunet
secunet Security Networks AG
Kurfürstenstraße 58
45138 Essen
secunet
secunet Security Networks AG
Alt Moabit 96
10559 Berlin
SysEleven
SysEleven GmbH
Boxhagener Str. 80
10245 Berlin
secunet
secunet Security Networks AG
Dreizehnmorgenweg 6
53175 Bonn
secunet
secunet Security Networks AG
Ammonstraße 74
01067 Dresden
secunet
secunet Security Networks AG
Mergenthalerallee 77
65760 Eschborn
secunet
secunet Security Networks AG
Osterbekstraße 90 b
22083 Hamburg
secunet
secunet Security Networks AG
Werner-von-Siemens-Straße 6
98693 Ilmenau
The Management Board of secunet AG
Marc-Julian Siewert has joined secunet Security Networks AG in July 2025 in the capacity of Chief Executive Officer (CEO) and Chairman of the Management Board. He brings with him many years of international experience in various areas of the high-security industry.
Marc-Julian completed his studies of business and management in the UK, Canada, USA and Spain. Following his Master’s degree, he worked in technology consulting for two years, before joining Papierfabrik Louisenthal GmbH in 2013 as Vice President Key Accounts. From 2015, he held various roles in Sales & Marketing in the Currency Technology division of Giesecke + Devrient GmbH, where he spent many years abroad.
He was appointed Group Vice President and Head of Value Added Solutions and Services at the same company in fall 2018. Before joining secunet, he was a member of the management board of Veridos GmbH for six years, including more than three years as CEO.
Torsten Henn started at secunet GmbH back in 1997 as a consultant and project manager and took on various management positions within the company. In the course of secunet's realignment, Torsten Henn joined the extended Management Board as Chief Operating Officer (COO) in 2015 and has been a member of the Management Board since June 2019.
Torsten Henn studied Computer Engineering in Siegen and worked for Telekom before joining secunet. He then worked for RWTÜV Anlagentechnik and TÜV Informationstechnik. Since 1994, Torsten Henn has been working exclusively on the subject of IT security.
Dr Kai Martius has been Chief Technology Officer since 2015 and a member of the Management Board of secunet Security Networks AG since 2019.
He is one of the key architects of the SINA IT high-security solution and also has extensive experience in the design, implementation and use of IT security products in the public sector.
Dr Martius joined secunet back in 1999 and was responsible for various topics in consulting and product development. Between 2007 and 2015, he was the Head of the High Security / Public Sector division at secunet.
Dr Martius holds a doctorate in electrical engineering from the Technical University of Dresden.
Jessica Nospers was appointed to the Management Board of secunet Security Networks AG as Chief Financial Officer (CFO) in June 2024.
She studied business administration at Saarland University, Germany. She began her professional career in 2004 at Deloitte in the Transaction Advisory Services division. During her almost 10 years there, she gained extensive knowledge and experience in the areas of M&A and auditing. In this time, she successfully passed the auditor exam and level I to III of the CFA charterholder exam. Before joining secunet, Nospers was Group Director Finance at Hengst SE and Group CFO at fernao group GmbH.
The Supervisory Board of secunet AG
The Supervisory Board of secunet Security Networks AG is comprised of six members. Four members are elected by the shareholders and two members by the employees in accordance with the One-Third Participation Act pertaining to employees on the Supervisory Board (Drittelbeteiligungsgesetz).
Corporate Compliance
Integrity, shared values, the reputation and trust of customers and business partners are always at the core of secunet's activities. An effective and transparent compliance organisation and uniform, clear principles and values determine our actions and form the basis for a secunet-wide understanding of compliance.
“Integrity is the greatest asset in our industry and forms the foundation of our organisation. Ethics and compliance are of central importance to us and we always act in accordance with applicable statutory requirements.
Our employees, customers and business partners can rely on us. We mean what we say, keep what we promise and take responsibility for it. As the Management Board, we set a good example – as a source of inspiration and as a role model for our employees, customers and business partners. We live diversity, tolerance and openness and treat everyone with respect. In order to promote an appreciative and inclusive working environment, we have signed the Diversity Charter.
On the Management Board, we face complex challenges every day and make decisions that require foresight and responsibility. An open and trusting ‘speak-up’ culture is essential for us. It is crucial to address concerns and challenges openly and discuss them together. It is only by means of transparent dialogue that we can develop the best solutions and continuously advance our company.”
Essen, 5 February 2025
The Management Board
The management's clear commitment to integrity gives rise to various measures. These are, firstly, training and counselling. secunet employees are regularly trained and sensitised to compliance issues. Participation in the training courses, which have taken place via online training since the outbreak of the Corona pandemic, is mandatory for all employees every two years.
The Compliance Office is available to answer any additional compliance questions. Secondly, guidelines define how conflicts of interest and corruption are to be handled. In the course of compliance training, attention is also drawn to compliance with the relevant guidelines and requirements by secunet's business partners.
Quality and Environmental Management
Living quality, acting sustainably
Our thinking and approach has always been driven by quality. Not just in our products, but in all our processes and services. That is why we have voluntarily committed ourselves to shaping quality formally, actively, comprehensively and continuously. We have the results of these efforts regularly audited by independent auditors. Our quality management system is certified in accordance with DIN EN ISO 9001.
These points are particularly important to us:
Consistent environmental protection without ifs and buts
We consider climate-neutral business operations to be one of the primary goals of all sustainable business activities. We protect and preserve our environment by ensuring the efficient use of energy and resources throughout our entire value chain. We strive to reduce greenhouse gas emissions to a minimum and prefer renewable energy sources to fossil fuels.
We only pollute water, soil and air to the extent that is absolutely necessary and justifiable after exercising reasonable care and common sense. This includes avoiding waste and handling chemicals responsibly. We fulfill all binding obligations, including applicable legal and regulatory requirements.
To continuously improve our environmental protection efforts, we apply an environmental management system that meets international standards.
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