SpaceX shares began trading for about $150 each, 11 per cent higher than the $135 estimate.

Wits its official share pricing announcement, SpaceX's IPO has begun.

The initial public offering from the rocket and AI company raised some $75 billion, making the company one of the biggest in the world — and likely making Elon Musk a trillionaire.

SpaceX shares opened at US$150 in Nasdaq, up from its US$135 IPO price per share.

Musk owns 85 percent of the controlling shares, so “public” is relative.

SpaceX shares surged on market debut, pushing valuation to $1.77 trillion as Elon Musk’s firm enters the trillion-dollar club and eyes AI-space expansion.