Arjan Middelkoop joins the SIDN team as New business, Marketing & Sales Manager

On 8 August, Arjan Middelkoop joined the SIDN team as our New business, Marketing and Sales Manager. He succeeds Sieger Springer, who has decided to take up a new challenge.

Arjan has more than twenty years' experience in marketing, communication, sales and product management at companies such as ABN AMRO, Nuon, T-Mobile, KPN and XS4ALL. In his previous roles, he was involved with a string of important innovations, including Chipknip, KPN EEN and XS4ALL's First Class proposition.


With his extensive marketing experience, his background in telecommunications and the internet, and his flair for innovation and change, Arjan can add impetus to our ambition to develop and bring to market new propositions that contribute to secure and reliable digital living.


  • Wednesday 9 January 2019

    SIDN Labs

    A new year, a new research agenda


    Five challenges, two research areas

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  • Monday 28 January 2019


    Webshop Trade Days 2019 focus on platforms


    No app, no sales

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  • Monday 18 December 2017

    Internet security

    Cybercriminals rake in nearly half a million dollars a day from advertising


    Another scam based on domain names that look like popular brands

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