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Rollercoaster. That’s probably the most accurate word to describe SpaceX’s opening two weeks as a public company. 

The stock surged for several successive days following a record-breaking IPO, briefly overtaking both Amazon and Microsoft in terms of market cap and rising more than 60% on the initial share offering price of $135.

But the good times weren’t set to last. Daily drops of 5% and 4% were followed by a 16% slump as jitters crept into the market. Steadier days followed, with single point moves in either direction.

The volatility underscores the whipsaw nature of a story-driven stock.

Lofty sci-fi ambitions, huge coverage in the…