TREE NEWS update: SpaceX’s weight in the Nasdaq 100 will rise to 2.82% when the index’s quarterly rebalance takes effect next Monday, September 21, up from roughly 1.28% currently. The increase matches the preliminary weights previously published by the index provider. By market capitalization SpaceX is the seventh-largest company in the index at over $2 trillion, but its current index weight does not place it in the top 20.
Nasdaq 100 Rebalance: SpaceX Weight to Rise to 2.82%
The gap between SpaceX's market-cap rank and its current index weight is the real story here: index funds tracking the Nasdaq 100 have been structurally underweight the seventh-largest constituent, and the rebalance mechanically corrects that. The forced buying is passive and pre-signalled, so the more telling signal is what the weight adjustment says about how index providers are handling megacaps whose free-float or eligibility profile diverges from raw valuation. Whether SpaceX's weight keeps converging toward its market-cap rank in future rebalances is the open question.
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