The company has set aside an unusually high number of shares for retail investors. Still, experts say, you’re just getting the crumbs.

SpaceX's IPO attracted roughly $150 billion in orders, but the bigger story may be how few shares are available as investors compete for a limited public float.

Charles Schwab, Fidelity, Robinhood, SoFi and Morgan Stanley's E-Trade are among the brokerage platforms making SpaceX shares available.