Australia's wealthiest person, Gina Rinehart, acquired a stake of over $1 billion in SpaceX's record $75-billion IPO, WSJ reported. Her firm, Hancock Prospecting, described the investment as "significant" in a heavily oversubscribed IPO and is one of the largest moves outside Rinehart's core iron ore business. SpaceX shares jumped 19% in their debut, valuing the firm at over $2 trillion.