SPCX Slides 5.80% as Index Buyers Meet the Cursor Profit-Takers

No News, Just the Cursor Hangover

There is no fresh catalyst behind SPCX's 5.80% slide to $198.10 — and that is the point. The stock is still working off the spike to a $225.64 record high on June 16, the same session SpaceX confirmed its $60 billion all-stock acquisition of AI coding startup Cursor. That deal, formalized as a merger agreement with Cursor parent Anysphere, bolts a frontier-AI story onto a company that already folds in Starlink and xAI. The pop it produced has now reversed into ordinary profit-taking. Zoom out and the whole thing is days old: SPCX only debuted on the Nasdaq on June 12 at $160.95, the largest IPO ever, and ran more than 40% inside a week before this leg lower.

A 4% Float Cuts Both Ways

What makes the tape violent is the supply side. Only about 4% of SpaceX is in free float, so a handful of holders cashing out the Cursor pop can move the stock several percent on its own. Pulling the other way is mechanical demand: index-inclusion buying that began June 13 forces passive funds tracking the major benchmarks to accumulate SPCX in the open market regardless of price. That is the actual tug-of-war right now — discretionary profit-takers against price-insensitive index bids — and in a float this thin both sides hit with outsized force. Former Nasdaq CEO Robert Greifeld put it bluntly, saying SPCX trades not on fundamentals but on 'the aspiration of what's possible'.

Where the Bear Case Lives

The reason the bid keeps getting tested is valuation. Morningstar cut its fair value to $62 after the Cursor deal, roughly a third of spot, and flagged SPCX as among the most expensive names in its entire coverage universe at 141x trailing sales and about 78x projected 2026 sales — over 3x Broadcom's multiple. There is also a reflexive wrinkle buried in the deal: the Cursor exchange ratio is set by SPCX's seven-day VWAP before closing, so a weaker stock into Q3 means more shares issued and more dilution, not less. The next real tests are dated, not technical — September 2 earnings and the December lockup expiration that finally unfreezes the float. Until one of those lands, price discovery stays a function of flow, not fundamentals.