SpaceX's weighting in the Nasdaq 100 has been confirmed at 2.82% following the quarterly rebalance, effective Monday. This marks a significant increase from its previous weighting of approximately 1.28%. The final figure, calculated using Friday's closing price, matches the provisional weighting published by the index provider.

SpaceX's relatively small weighting dates back to its addition to the index in July, when most of its shares were still locked up and unavailable for public trading. Even with Nasdaq changing its rules to allow newly listed large-cap companies to enter sooner, the company's current weighting does not place it in the top 20 despite being the seventh-largest company in the index by market value, at over $2 trillion. This adjustment matters because passive funds tied to the benchmark must adjust their holdings accordingly.

Such funds include the $482 billion Invesco QQQ Trust Series 1 (QQQ), one of the largest ETFs. More than 200 investment products track the Nasdaq 100, with over $800 billion in assets under management globally. The index tracks the largest non-financial companies listed on the Nasdaq stock market.

Edward Yoon at Macquarie notes that recent rebalancing events have taken on greater significance amid active macro forces, including geopolitical developments, inflation concerns, tariff uncertainty, interest rate moves, and continued volatility across AI and tech stocks.