Why is Space Exploration Technologies stock sliding today?

Space Exploration Technologies Corp stock fell 3.0% in morning trading after the company filed an SEC Form 8-K confirming the formal closure of its $60 billion all-stock acquisition of Anysphere, Inc., the developer of AI coding tool Cursor, with the transaction taking effect today. The filing disclosed that approximately 389.3 million new Class A shares were issued to Cursor shareholders, converting the long-anticipated dilution risk into a concrete supply event that the market is now pricing in.

The deal’s completion arrives at a technically vulnerable moment for SPCX. Short interest in the stock had already plummeted from roughly 34% to around 11% of the publicly traded float in the days prior, meaning the short-covering fuel that powered the stock’s rebound from its 52-week low of $104.83 is largely spent. Additionally, analysts and market observers have flagged that a further tranche of approximately 319 million insider shares is scheduled to become eligible for sale on August 20, sustaining the supply overhang narrative into next week.

Valuation concerns continue to serve as a structural headwind. With SpaceX trading at a price-to-sales ratio of roughly 61 times and reporting negative GAAP earnings driven by $18.4 billion in quarterly capital expenditures, fundamental analysts have cautioned that the stock leaves little room for execution missteps. The broader market provided no meaningful offset today, with the S&P 500 and Nasdaq essentially flat, and the Dow Jones marginally in the red, offering no sector-wide tailwind to absorb the SPCX-specific selling.

Taken together, the formal confirmation of Cursor dilution, the exhaustion of short-covering momentum, and the looming next lockup expiration combined to push SPCX from an opening print of $143.00 down to a session low of $137.09, with the stock trading at $137.12 — still well above its 52-week low but a significant distance from its 52-week peak of $225.64 set at the time of the Cursor deal’s announcement.