Being ‘Royal’ (Koninklijk) is profitable for Dutch bourse-listed companies online stockbroker BinckBank says, the Telegraaf reports on Friday.

A study of 200,000 BinckBank individual investment accounts revealed that companies bearing the Royal predicate posted a total return of 85% in the four years Willem-Alexander has been king. Other shares listed on the Amsterdam bourse  returned only 67% in the period.

Binck said 40% of all private accounts held shares bearing the royal designation. These include Shell, Ahold and Philips, but in principle any limited liability company gains the right to the royal predicate when they have been in business for 100 years.

The full list is as follows:  Ahold Delhaize, Air France KLM, BAM, Boskalis, Brill, DSM, KPN, Philips, Porceleyne Fles, Postnl, Shell, Vopak and  Wessanen.

Douwe Egberts Master Blenders disappeared from the list when it was taken over and Imtech left when it declared bankruptcy. But construction company VolkerWessels, formally Koninklijke Volker Wessels Stevin is soon to join the list.