According to the Bloomberg Billionaires Index, Kristiansen is the third richest Dane, with a net worth of US$7.26 billion as of April 2024.

As a child, he often inspired and tested new model concepts and their building instructions.

He introduced themes, minifigures, LEGO.com, Lego Mindstorms and licensed properties.

[3] Lego is privately held and is controlled by the Kristiansen family and their foundations.

[5] In 1995, Kristiansen bought Strathconon Estate, in the highlands of Scotland, covering 60,000 acres (24,000 ha).