The recent initial public offering (IPO) of Space Exploration Technologies Corp.

(NASDAQ:SPCX) has resulted in a significant financial gain for its former employees, while ex-staff of Jeff Bezos' Blue Origin are reportedly unhappy over virtually worthless stock options.

SpaceX's valuation has surpassed $2 trillion, creating millionaires across the company, including engineers, technicians, and everyone who received stock options as employees.

On the other hand, former employees of Blue Origin have expressed disappointment over the company's unusual equity approach to Business Insider.

The stock options program at Blue Origin only promised a payout if the company went public or was sold, and these options expired if these events did not occur within a decade.