Net Worth details: Stefano Pessina earned most of his fortune from his 13 percent stake in drugstore company Walgreens Boots Alliance. Pessina acquired a stake in Walgreens in 2012 before it purchased Alliance Boots. He has been credited with 35 percent of the proceeds from a transaction in 2014 when Walgreens purchased the remaining 55 percent for $5.3 billion. Walgreens Boots Alliance had $117 billion revenue in 2016.
