Jeff Bezos recently announced plans to stand down as chief executive and hand over to Andy Jassy this summer. Jassy, 53, has long been seen as a potential replacement for Bezos. Mr. Jassy has spent more than two decades absorbing lessons from Mr. Bezos. Jassy is one of the company’s highest-paid executives at Amazon. The incoming CEO currently has 81,500 shares, worth about $275 million.