Since its first trade on June 12, SpaceX has lost over $500 billion in market cap, a stunning blow to retail investors who jumped into Elon Musk's rocket company at their first opportunity. The stock is coming off its fourth straight weekly loss and is more than 50% off its intraday high.

Not since Facebook's IPO in 2012 have tech investors seen such a high-profile offering lead to such early disappointment. Facebook stumbled out of the gate and trended lower for months before bottoming at less than half its IPO price. But Facebook's total market cap after its first day of trading was about $100 billion, or roughly one-fifth the amount of value SpaceX has shed since its initial pop.