About us



An all communicating world, based on trust and security.


Clavister delivers business continuity through holistic cybersecurity solutions, based on Swedish innovation


Clavister is a leading European cybersecurity
vendor with over 20 years of experience.

Clavister is a leading European cybersecurity vendor with over 20 years of experience. Seated in Sweden, the company has customers—communication service providers, governments, enterprises and managed security service providers (MSSPs)—in more than 150 countries. Clavister provides unique security solutions to protect their digital assets and secure business continuity.
The company is, since 2014, listed on Nasdaq First North.

Board of Directors

Viktor Kovacs

Chairman of the Board, Member of the Audit Committee, Member of the Finance Committee, Member of the Remuneration Committee

Viktor Kovacs has significant global experience in go-to-market strategy and execution with growth-stage companies in the ICT sector. Viktor has held executive roles in EDS Corp. (now HP), Octel Communications (sold to Lucent), Portal Software (now Oracle), Cisco, and others.

: Bachelor of Engineering
Born: 1968
Elected to the board: 2017
Other Board assignments: Board member of EMFC Loan Syndications
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: 17 000 shares 

Jan Frykhammar

Director of the Board, Chairman of the Audit Committee, Chairman of the Finance Committee

Jan Frykhammar has 26 years of work experience from various roles in Ericsson, being the Group CFO from 2009 and subsequently interim CEO of the Ericsson Group from July 2016 until January 2017.

: Bachelor of Science in Economics and Business Administration
: 1965
Elected to the board
: 2018
Other Board assignments
: Chairman of Openet, Kvdbil and Aspia. Director in Telavox and Roima Intelligence
Independent to the company and management: Yes
Independent to bigger shareholders
: Yes
Holdings in Clavister
: 45 725 shares

Kimberly Matenchuk

Director of the Board, Chairman of the Remuneration Committee

Kimberly Matenchuk is a Managing Director of Ricardo Software. She has over 15 years’ experience in global and digital software sales (including 10 years at Google), developing and executing Go To Market strategies, delivering new global partnerships, and leading enterprise sales teams across Europe.

: Executive Master of Business Administration and Bachelor of Commerce
Born: 1983
Elected to the board: 2019
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: 15 264 shares

Staffan Dahlström

Director of the Board,
Member of the Remuneration Committee

Staffan Dahlström is since 2009 the CEO of HMS Networks AB (listed on Nasdaq OMX Mid Cap) and one of its co-founders.

: Executive MBA and Computer Science studies
Born: 1967
Elected to the board: 2018
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: 1 978 943 shares

Martin Roos

Director of the Board

Martin Roos, with background from several non-executive Board of Directors positions, including Chairman roles in global TMT industry and several CEO roles within the same industry is now the Chariman of the Board at Strata Analytics group and non-executive board of director at Rencom, BIMA AB and Seamless Distribution Systems.

: MSc Chemical Engineering from Royal Institute of technology and a MSc in Economics from Stockholm School of Economics
Born: 1975
Elected to the board: 2021
Other Board assignments: Seamless Distribution Systems, Nexam Chemical, BIMA/Milvik AB, Lignin Industries AB
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: 528 584 shares

Martin Kreuzer

Director of the Board

Martin Kreuzer has fifteen years of experience from intelligence work and information security matters, as Civil Servant at German intelligence services—amongst others in the field of counter-economic espionage and counter cyber warfare. Martin currently is Risk Manager for Cyber Risks in Cyber Insurance at Munich Re.

Education: Applied Administrative Science and Law from German Federal University.
Born: 1977
Elected to the board: 2020
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: 8 500 shares

Malte Pollmann

Director of the Board

Malte Pollmamm, member of the Utimaco Management Board since 2008, and CEO for the company 2011-2019 currently holds the position as Chief Strategy Officer at Utimaco. He also serves on the Supervisory Board of the International School of IT Security (ISITS) AG in Bochum.

: Dipl. Physics
Born: 1976
Elected to the board: 2021
Other Board assignments: Utimaco GmbH, Aachen Management Board, is-its AG, Bochum Supervisory Board
Independent to the company and management: Yes
Independent to bigger shareholders: Yes
Holdings in Clavister: No

Executive Management

John Vestberg

President and CEO

John Vestberg co-founded Clavister in 1997 and was imperative in the process leading up the release of the company’s first commercial security product, as well as a key driver in securing business with some of Clavister’s most important strategic accounts. Vestberg built up Clavister’s Research & Development department, and acted as the company CTO from 2003 until 2017, when he assumed the CEO responsibility. Before Clavister, Vestberg was a sole proprietor conducting IT consultancy projects for public administration as well as private firms.

Education: Certified Upper Secondary School Engineer
Position held since: June 22, 2017
Board assignments: Board member of Örnsköldsviks Industrigrupp
Holdings in Clavister: 524 520 shares and 500 000 warrants

Przemek Sienkiewicz

Chief Commercial Officer

Seasoned manager with more than 20 years of operational, sales & marketing management and program management executive experience and large worldwide contact base. Managed established businesses, start-ups and several EMEA high growth market openings for Minolta, Lucent Technologies, Portal Software, Oracle, Central Europe On-Demand, Google and IBM. Experienced with program and project management, interim management. Previously chosen as advisor to the boards and CEO’s of large private and public organizations.

Education: Academic Degree, Corporate Strategy and Finance
Position held since: November 15, 2017
Holdings in Clavister: 85 777 shares and 250 000 warrants

Nils Undén

Chief Technology Officer

Since 1993 when he began taking on engineering management roles, Undén’s career has been defined by helping tech companies navigate their operating terrain to find the right products and strategies to succeed. Be that large international product organisations, start-ups across CRM, logistics, fintech and telecom solution providers, his first priority is to build compelling products for companies. Undén has a professional drive—based in an analytical/data driven approach—to guide software development teams to deliver innovative and rich solutions.

Education: Bachelor of Science
Position held since: February 1. 2020
Holdings in Clavister: 37 000 shares and 200 000 warrants

Johan Edlund

Chief Products Officer

Returned to Clavister in March 2018 as Chief Marketing & Products Officer after having roles as Commercial Manager Cloud at Aptilo Networks, Managing Director at Procera Networks AB and VP Product Management at Procera Networks Inc. Before joining Procera Networks held the position as VP Product Management at Clavister and several roles within the Telco Group 3, with focus on marketing, products and commercialization.

Education: Master of Science in Digital Media
Position held since: March 1, 2018
Holdings in Clavister: 35 800 shares and 250 000 warrants

David Nordström

Chief Financial Officer

David Nordström is an experienced fiduciary officer with wide experience and responsibility. He has been an authorized auditor, having been with PwC in Stockholm since 2011 with a wide latitude of projects and professional input. As main auditor for some ninety companies, Nordström has been in charge of larger auditing projects towards publicly listed clients.

Education: Master of science in business and economics
Position held since: October 1, 2020
Holdings in Clavister:  20 000 shares and 250 000 warrants

Adrianne Edblad

Chief People and Culture Officer

Adrianne has several years of experience working with HR in global companies within the information technology, service and mass media industry. Having a demonstrated history as business partner driving strategic and tactic HR projects in EMEA and Nordics for companies such as Thomson Reuters, Point Carbon and Sutherland.

Education: Master of Science in Behavioural Science
Position held since: February 1, 2019
Holdings in Clavister: 2 283 shares and 200 000 warrants

PDMR Transcations / Insynshandel


Quality Policy

For us quality is not a destination in itself, it is a journey. We have a constant focus on our market and what our customers need.

This is how we are able to offer flexible products and service that meet both present and future customer demands. Giving customers products and services that they want and rely on for their daily business is a prerequisite for our business success.

It is therefore crucial that every Clavister employee takes an active part in the continuous improvement of our products, services and operations.

In 2007 we decided to get official recognition for our work and certify the company in accordance with the ISO 9001 quality standard. In early 2008 we received our ISO 9001 certification as an approval of our dedication to quality and process improvements.

We have also committed to our European heritage and as such carry the label ‘Cybersecurity made in Europe’, awarded to us by the European Cyber Security Organisation.

Our History

Scandinavia and Sweden have—over the course of the last ten years—become one of the hottest and most successful tech corridors in the world. In 2015, Sweden became the second most prolific tech hub in the world on a per capita basis, producing USD6.3bn in value per million people, compared to Silicon Valley’s USD8.1bn, according to a recent report from the investment firm Atomico. It’s a salute to Sweden’s innovation and tech savvy.

Clavister, a Latin word meaning ‘Key holder’ came together by a union of chance in an unlikely Swedish place. Örnsköldsvik, located between Stockholm and the Arctic Circle, is blessed with natural beauty. But more importantly, it’s powered by an excellent university in Umeå that feeds its knowledge waters as well as an entrepreneurial spirit born of creating value and wealth from modest means.

The Clavister story begins with entrepreneur Peter Johansson, who had founded an early Internet company, EnterNet Sweden HB in 1995. As it grew, the need for more equipment—namely a secure router—became mission critical. Johansson had joined forces with another software entrepreneur, John Vestberg, who, together with talented software engineer Mikael Olsson, quickly set about solving the problem. Together, they’d create a secure and fast router, something that took larger companies teams of staff and budget to achieve. In fact, they were developing an actual product that could be offered to the market, a device and code that could take on the security aspects of an always on Internet connection. It was an idea that could be sold to the world. Clavister AB was born in 2001 as EnterNet AB became the new company, founded by Johansson and co-founded by Vestberg, ready to see how far their ambitions could go.

By 2002–2003 they launched their first physical appliance, a highly regarded firewall device that performed well in test after test. By 2008 the first virtual gateway was released, another critical technological milestone. Clavister’s reputation grew and European markets started to hunger for their products and services. Soon Asian offices were added. The development of their own, proprietary software – first cOS core and later its cOS stream solution—made the product into an award winning and industry respected leader in cybersecurity and digital threat deterrence. Investment and growth have helped put Clavister create an installed base of 20,000 customers with a 95% satisfaction rate and propelled it to be one of the few Swedish technology companies to be listed on the NASDAQ OMX Nordic exchange. It’s also achieved a formidable client list that includes Nokia, Canon, D-Link as well as collaborations with Intel, Redhat, VMware and others. It’s an almost 20 year history that has led Clavister to its present market position, a leader in virtual security with an eye to the future.

Get in touch! It will only take a minute