SpaceX IPO makes Elon Musk the first-ever trillionaire

Elon Musk, the wealthiest person alive, became the first-ever trillionaire when SpaceX stock began trading on Friday.

The company's founder and CEO owns roughly four out of every 10 SpaceX shares after the initial public offering.

SpaceX hit markets at a valuation of nearly $2 trillion, allowing Musk to accrue hundreds of millions of dollars in new wealth, at least on paper. It marked the largest IPO of all time.

ABC News' Elizabeth Schulze reports.