Elon Musk returned above the trillion-dollar threshold after gains in SpaceX and Tesla lifted his estimated net worth to $1.04 trillion on Monday, Forbes reported. SpaceX shares rose 7.6% and Tesla gained 2.2%, adding $58.7 billion to Musk's fortune; he owns about 38% of SpaceX and 11% of Tesla. Earlier reporting put SpaceX's close at $171.09, up nearly 8% and its highest level since mid-June, while estimating Musk's daily wealth increase at about $30.6 billion. Musk first crossed $1 trillion in June following SpaceX's IPO, reached a reported high of $1.45 trillion, and later fell back below the mark as the company's stock declined. SpaceX was up more than 16% over the preceding five trading days, while Tesla was up 5.7% over that period but down 13.6% year-to-date.