Index Funds Are Being Forced to Buy SpaceX Whether They Want It or Not
A quarterly index formula just made millions of passive investors larger SpaceX shareholders, and none of them had a say in it. The mechanics behind that forced buying also set up a collision with an unlock schedule that cuts in…
The third Friday of September marks a quiet ritual on Wall Street: the Nasdaq 100’s quarterly rebalance. This month’s version was not quiet. SpaceX (NASDAQ:SPCX | SPCX Price Prediction), which joined the index in July after its IPO, saw its weighting more than double, according to CNBC’s Morgan Brennan. Every fund tracking the Nasdaq 100, starting with the Invesco QQQ (NASDAQ:QQQ), is now a materially larger holder of a company its portfolio managers never chose.
Nasdaq weights constituents by float-adjusted market capitalization. SpaceX’s float expanded as post-IPO lockups expired, pushing the index weight higher. This same event that forces passive funds to buy also adds new supply to the market, making the demand story more fragile than headlines suggest.
If you own a Nasdaq 100 fund, you own more SPCX than you did last week. A formula decided that.
What Actually Changed in the Index
The Nasdaq 100 is reweighted quarterly in March, June, September, and December after the close of trading on the third Friday, using prior-month data. No issuer may exceed 24% of the weight.
Index weight scales with float-adjusted market cap. When SpaceX entered in July, only a portion of its shares were public. As lockups rolled off through August and September, the public float grew, and Nasdaq’s September recalculation caught up.
Float Expansion Cuts Both Ways
SpaceX has roughly 7.7 billion shares outstanding and a float near 3.7 billion. Insiders hold about 12.7% and institutions about 48.2%.
Every share that moves from restricted status to tradable float raises the index weight and pulls passive buying. It also creates a real seller, because employees and pre-IPO holders monetize on unlocks.
CNBC’s Fast Money traders noted the stock had traded from $135 at IPO above $200 before falling into the $100s, with another unlock in late October and early November. Options were pricing about an 18% implied weekly move around the earnings-and-unlock combination.
The rebalance and unlock schedule are the same event viewed from two sides. Passive demand is a one-time adjustment; the float it created stays in the market.
What Nasdaq 100 Holders Now Own Without Choosing
At $151.85 and roughly $1.17 trillion of market capitalization, SpaceX is among the largest companies ever admitted to the Nasdaq 100 in its first year of trading.
If you own QQQ, you own a company that reported a $541 million net loss last quarter on $7.81 billion of revenue, with a $143 million operating loss. Adjusted EBITDA was $3.54 billion, up 191% year over year on 92% revenue growth, with backlog at $47.5 billion.
You also own an $18.37 billion quarterly capital expenditure program and a pending $60 billion acquisition of Cursor expected to close in the third quarter.
Mechanical inclusion does not weigh whether any of that belongs in the same portfolio bucket as mature Nasdaq 100 heavyweights.
What the Business Must Deliver After the Rebalance
Forward multiples are stretched. A forward P/E of 204x and price-to-sales of 87x sit against analyst consensus of $222.42, with 6 strong buys, 22 buys, 5 holds, and 2 sells.
Management pulled its internal $1 trillion revenue timeline forward from 2031 to 2030, with cloud services the largest driver. Starlink subscribers doubled to 12.0 million. Compute capacity reached 1.4 gigawatts, with over two gigawatts targeted by year-end.
Elon Musk told investors the “current economics have translated into a less than one-year payback on our new capital deployments for compute.” That claim must hold for the multiple to sustain.
Bull and Bear Case for SPCX Stock
The bull case rests on three growth businesses (launch, Starlink, and AI compute), 92% revenue growth, positive AI-segment EBITDA, and roughly $100 billion in cash and equivalents. The $47.50 billion backlog and over $6 billion in multi-year U.S. Space Force Starshield contracts create recurring-revenue visibility few trillion-dollar companies enjoy at this stage.
The bear case starts with index-mechanic demand being temporary. Lockups continue into late October and early November, adding supply into a stock at 87 times sales. A $541 million net loss and $327 million of related-party interest expense sit inside a valuation that assumes flawless execution across Starship, StarMind, Grok, and Cursor integration.
The deciding variable is the next unlock. If SPCX absorbs it as it did in August, the September rebalance was a floor. If not, the passive bid ends at the close on the third Friday of December while float keeps growing.
Index inclusion changes who owns SpaceX. What SpaceX earns is a separate question.
Contact [email protected] for any questions or corrections.
Omor Ibne Ehsan is a writer at 24/7 Wall St. He is a self-taught investor with a focus on growth, cyclical, and dividend equities that have strong fundamentals, value, and long-term potential. He also has an interest in high-risk, high-reward investments such as penny stocks.
