SpaceX just went public. These alum-founded startups are following its playbook

SpaceX finally went public on Friday, marking what could be one of the most profitable stock market debuts ever. The move stands to make Elon Musk, already the world’s wealthiest person, even wealthier, while turning many employees and early investors into millionaires and billionaires overnight. It’s been a long road for SpaceX. Founded in 2002, the company has built an array of businesses around one key achievement: mostly reusable rocket launches that have drastically reduced the cost of s...