SpaceX Weight in Nasdaq 100 Will Rise to 2.82 Percent
The space company will see its influence on the benchmark index more than double effective Monday.
Updated on Sept. 19, 2026 in Space
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SpaceX will account for 2.82% of the Nasdaq 100 index starting on September 21, 2026. This adjustment marks a significant increase from its current weighting of 1.28%.
Why it matters
The rebalancing reflects the shifting composition of the technology-heavy index toward aerospace and private spaceflight sectors. This change forces institutional funds tracking the Nasdaq 100 to adjust their holdings to match the new allocation.
The new index weighting of 2.82% was determined using the Friday closing price from September 18, 2026. This represents a 1.54 percentage point increase over the 1.28% baseline.
The players
SpaceX
An aerospace manufacturer and space transportation company known for its reusable launch vehicle architecture and orbital satellite constellation.
Nasdaq 100
A stock market index composed of 100 of the largest non-financial companies listed on the Nasdaq Stock Market.
The details
Index rebalancing is the process of adjusting the proportions of assets in an index to reflect current market capitalizations. By using the closing price of the final trading day of the week, the Nasdaq 100 ensures the weighting reflects the most recent valuation of SpaceX. This mechanism requires funds that mirror the index to buy or sell shares to maintain the specified percentage allocation.
Timeline
September 18, 2026: Friday closing price used for weighting calculation.
September 21, 2026: Index rebalance takes effect.
The Tech Race
This reweighting follows the standard Nasdaq 100 index methodology updates meant to track market dominance across sectors. It cements SpaceX as a central component of the index alongside legacy software and hardware giants.
Investors and retirement funds that hold assets tied to Nasdaq 100 trackers will automatically have their portfolios adjusted to the new 2.82% weighting for SpaceX. Individual investors do not need to take action as the index rebalancing occurs at the institutional level.
The takeaway
The move highlights the rising financial weight of space infrastructure within public markets. Watch for the next quarterly rebalance date to see if the allocation remains stable at the new levels.
What happens next
The index rebalance will officially take effect on September 21, 2026.
Further reading
For broader trends in the aerospace sector, see Space.
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