Why SpaceX stock didn't plummet after Aug. 6Aug. 6 was the date of SpaceX's first lockup expiration, enabling 911.5 million of insider shares to be available for sale. There are a couple of things to consider here, however, that may explain why SpaceX's stock didn't simply fall over a cliff last week. And indeed, trading volume topped 255 million on Aug. 6 -- the highest they've been since mid-June, shortly after SpaceX stock went public. Does this mean SpaceX stock is destined to rally higher now? SpaceX stock may not have crashed last week, but that doesn't mean it's out of the woods, and more insiders won't sell the stock in the future.