Tesla shares hit their highest in nearly a year on Monday after CEO Elon Musk said the electric-vehicle maker was testing its robotaxis without safety monitors in the front passenger seat. While much of Tesla's $1.

Elon Musk on Monday became the first person ever worth $600 billion, Forbes said, ​on the heels of reports that his SpaceX startup was likely to go public at a valuation of $800 billion.