Oomen is good for a few bucks, he’s one of the richest men in the country. He earned his fortune with another company he founded in 1986: Optiver.
With his estimated net worth of €150 million Oomen is a modest investor. His personal holding is called Optiverder, and can be found in the AFM registers with stakes in small caps. In spite of a bull market, his small cap adventures haven’t turned gold. He owns 5% of Grontmij and is facing a loss on this one of 75% (since 2008). He scratched a 5% stake in ICT Automatisering between 2011 and 2013 – only a small loss if he was lucky.