SpaceX's Doubled Nasdaq-100 Weighting Takes Effect at Monday's Open

SpaceX's new Nasdaq-100 weighting — roughly 2.82%, up from about 1.28% — took effect at the start of regular trading Monday, September 21, 2026, following Friday's quarterly rebalance trades at the closing cross (SPCX closed Sept 18 at $152.71, down 1.36% from Sept 17's $154.81). Early Monday trading was mixed across data providers: one report described shares changing hands near $153 in premarket, up roughly 1% from Friday's close, while a separate intraday quote had the stock around $151.75-$152.00, down about 0.5-0.6% — a spread consistent with the index-fund buying (Wall Street estimates of $15.5-22 billion) working through the market at the open rather than a single decisive move. No confirmed closing price for the session was available as of this update.