Berkshire Hathaway has served as Warren Buffett's investment vehicle for over 50 years, and the legendary investor was busy buying shares of several stocks in the first quarter. Between rising costs and wages, inflation, and huge investments to build up its capabilities to meet increasing demand at the beginning of the pandemic, Amazon posted a net loss in Q1. *Stock Advisor returns as of June 2, 2022 John Mackey, CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool's board of directors.