A beer billionaire likes to randomly pick a stock to buy every two weeks — and trusts his family's former babysitter to carry out the trade. Jim Koch, the 74-year-old cofounder of Boston Beer Company, ...

Not only is Elon Musk now the world’s wealthiest person, but he apparently also wields some power over random penny stocks. When the Tesla and SpaceX CEO tweeted “Use Signal,” he meant to suggest that ...