As speculation builds around a potential SpaceX initial public offering next year, billionaire investor Bill Ackman has recently proposed an innovative route for the company to go public. He suggested merging SpaceX with Pershing Square SPARC Holdings, a special purpose acquisition rights vehicle created by Pershing Square Capital Management, which would give Tesla shareholders priority access to invest in SpaceX.Shares of the EV maker have climbed 15% on a year-to-date (YTD) basis. Last week, TSLA stock re ...