CNBC's Jim Cramer warned that overwhelming demand for SpaceX could send the stock to unsustainable levels after it begins trading.

Elon Musk's SpaceX is set to debut on stock market this week. It could become the biggest stock market debut in history, with the company expected to raise nearly $75 billion at a…

CNBC's Jim Cramer said one of the biggest risks facing the SpaceX IPO is speculators who may rush to sell shares shortly after the stock begins trading.