SpaceX's Nasdaq 100 Weight Set to Double, Sparks ETF Buying Frenzy
September 19, 2026
SpaceX’s weight in the Nasdaq 100 is set to roughly double at the upcoming rebalance, rising from about 1.28% to 2.82% as share lockups expire, prompting index funds and ETFs to buy more SPCX shares.
Despite being the seventh-largest Nasdaq 100 company by market value (over $2 trillion), SpaceX currently sits outside the top 20 by percentage weight within the index.
Major funds affected include the Invesco QQQ Trust Series 1 and Global Benchmark Products, which collectively manage hundreds of billions and track the Nasdaq 100 across many products.
QFF Score components show high profitability (9/10) and growth (9/10), with moderate momentum (7/10) and a valuation rank of 5/10, signaling caution about current pricing relative to intrinsic value.
Gurus are accumulating SPCX (about 15), while insiders remain net sellers, illustrating a split between institutional optimism and insider caution.
The immediate post-surge pullback is described as flushing out leveraged positions and stop-loss liquidations rather than signaling a fundamental deterioration.
Technically, $150 is a key support region with heavy volume; stabilization there could preserve the bullish trend.
Briefs Finance is hosting a live investor workshop on September 29 focused on profit strategies amid a weakening dollar.
On September 18, the stock opened higher, traded above $155 intraday, and closed down $1.36 at $152.71, with an intraday dip below the IPO price of $150.
Risks include potential masking of temporary index demand by turnover, thinner natural buying next week, and uncertainties from Starship tests, AI spending, or further unlocks impacting valuation.
Analyst price targets span from about $142 to $300, with neutral in the low end and buys toward the high end; notable targets include $142 (neutral) and $300 (buy).
Summary based on 7 sources
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Sources

Yahoo! Finance • Sep 19, 2026
SpaceX’s Nasdaq 100 Weight Is Confirmed at 2.82% in Rebalance
Investing.com • Sep 19, 2026
SpaceX Nasdaq 100 weight to jump to 2.82% in quarterly rebalance -Bloomberg
TechStock² • Sep 20, 2026
SpaceX Stock’s 335 Million-Share Rebalance Ends With a 1.4% Loss
GuruFocus • Sep 19, 2026
SpaceX (SPCX) Nasdaq 100 Weighting Nearly Doubles Amid High Price-to-Sales Valuation