Even a killer earnings report may not be enough to help SpaceX stock escape the gravitational pull of lockup expiration dates. Not that sky-high financials are exactly expected at today’s inaugural quarterly earnings call for Elon Musk’s rockets and AI empire. The real test for the newly public firm comes this Thursday, when a major tranche of insider shares exit their lockup period. As of Friday, short sellers had already booked about $8.3 billion in paper profits since the company’s debut in June, S3 Partners told CNBC. “It’s among the most aggressive and quickest bearish builds we have seen in a mega-cap name heading into its first earnings report post-IPO,” S3 Partners research head Matthew Unterman told CNBC.