Wall Street Shorts SpaceX (SPCX-US) as 40 Million Shares Targeted

Wall Street short interest in SpaceX (SPCX-US) has surged, with an estimated 40 million shares, or 5% to 7% of its outstanding float, now held short. This reflects growing market skepticism regarding the aerospace and AI company's valuation following its public listing, according to data from S3 Partners. Borrowing costs for shorting SPCX currently stand at approximately 60 basis points (0.6%), indicating an increased supply of lendable shares compared to earlier post-listing periods. Analysts note that SpaceX's near $2 trillion market capitalization and rapid valuation growth post-listing have attracted bearish bets, despite risks such as strong retail and institutional backing and CEO Elon Musk's historical opposition to short sellers. The stock experienced significant volatility on June 22, 2026, dropping to $147.11 before rebounding to close at $164.04, up approximately 6%.