SpaceX Stock Gains 2% Following Nasdaq-100 Weighting Increase

Key Facts

1SpaceX stock rose approximately 2% to near $156 in Monday trading.

2SpaceX's weighting in the Nasdaq-100 more than doubled as part of the index's quarterly rebalance.

In a move reflecting the direct impact of major index rebalancing on liquidity flows, SpaceX shares recorded a notable gain during Monday's trading session. According to reports, the stock rose by 2% to reach approximately $156 following the decision to more than double the company's weighting within the Nasdaq-100 index. This momentum is driven by upward pressure from institutional buyers adjusting their portfolios to align with the new index allocations.

These technical movements highlight the nature of institutional inflows tied to the Nasdaq-100, where quarterly rebalancing mandates index funds to increase holdings in stocks with rising relative weights. Per market data, SPCX shares closed at $152.71 on September 18, 2026, while NDAQ (the index operator) closed at $93.54 on the same date.

Technically, SPCX trading showed a price range between $149.93 and $156.6 based on the September 18, 2026 close, indicating a test of new resistance levels amid increased index exposure. Traders will watch for price stability above these levels, especially given the absence of immediate sector-specific catalysts in the upcoming calendar, leaving price action primarily dependent on the completion of institutional buying cycles.