S tefan Olsson is a Swedish billionaire heir and a principal owner of the Stena Sphere, one of Sweden's largest and most diversified family-owned conglomerates. He is one of the three children of the company's late founder, Sten Allan Olsson, who started the business in 1939 and built it into a global powerhouse. The Stena Sphere is a sprawling empire with core businesses in ferry transportation (Stena Line is one of the world's largest ferry operators), shipping of oil tankers and other vessels, offshore oil drilling rigs, and extensive real estate holdings.

After their father's death, control of the massive and privately held enterprise passed to Stefan and his siblings, his brother Dan and sister Madeleine. While his brother Dan serves as the group's CEO and is the public face of the company, Stefan is not involved in the day-to-day operations. He lives in London and manages his share of the family's vast fortune, which is derived from his ownership stake in one of Europe's most significant shipping and transportation dynasties.