S&P 500 slips as megacap tech selloff tests resilience of yearlong rally

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S&P 500 megacap tech selling

Highlights

- S&P 500 closes near 6,737, its sharpest single-day drop since October 10.

- Megacap tech leads declines as AI spending concerns escalate.

- Index tests support near 6,685, with deeper support around 6,515.

The retreat marks a notable shift for an index that has spent much of the year climbing within a steady ascending channel. The S&P 500 slipped from the upper portion of that channel toward its dashed median line, an area that has repeatedly acted as a pivot during prior corrections. The move also arrived after a multi-week consolidation phase that had already hinted at fading momentum beneath the surface.

S&P 500 price dynamics (Source: TradingView)

Technical structure shows the index still above all major moving averages, though the cushion has thinned considerably. The S&P 500 sits just above the 50-day EMA at 6,685, a level traders have repeatedly defended throughout the year. The longer-term 100-day and 200-day EMAs remain firmly upward-sloping, reflecting a still-intact primary trend. Yet the speed and breadth of Thursday’s selloff signaled that sellers are growing more confident in challenging these zones rather than backing away after shallow pullbacks.

Momentum indicators point to cooling sentiment. The RSI eased toward 48, reinforcing the idea that the market is entering a more balanced phase rather than flashing oversold conditions. The mild negative divergence that began forming in September now appears to be materializing, with price reaching successive highs while momentum failed to follow.

Fed expectations and AI valuations weigh on sentiment

Macroeconomic developments sharpened the market’s downside reaction. Traders have rapidly recalibrated expectations for a December rate cut, with odds falling from 95 percent a month ago to roughly 50 percent after several Federal Reserve officials emphasized caution. The uneven pace of incoming economic data following the government shutdown has added another layer of uncertainty to the central bank’s outlook, encouraging investors to reassess risk appetite.

At the sector level, the selloff was concentrated in the megacap technology companies that have carried much of the index’s advance this year. Shares of Nvidia, AMD, Broadcom, Tesla, Palantir, and Oracle fell between 3.6 percent and 6.6 percent as investors confronted the sustainability of soaring AI capital expenditure plans. With financing costs rising and expectations high, the market showed signs of fatigue toward companies that have priced in aggressive long-term assumptions.

This shift matters because the S&P 500’s 2025 rally has relied heavily on a narrow leadership core. When megacaps weaken together, the broader index often follows. Thursday’s drop reflected that dynamic, with selling extending beyond tech into other sectors as traders moved to de-risk ahead of next week’s economic data releases.

Key supports in focus heading into year-end

Despite the pullback, the broader structure remains constructive. The S&P 500 still trades within the boundaries of its rising channel, and the long-term trend has not broken. If buyers hold the 6,685 level and push the index back above the channel’s median line, momentum could stabilize quickly.

A deeper decline, however, would shift the market tone more materially. A break below the 50-day EMA would expose the channel bottom near 6,515, a level that aligns with a high-volume demand zone formed earlier in October. Losing this shelf would likely encourage defensive positioning, with rotation into value and cyclical sectors while highly valued technology stocks digest excesses built over the past quarter.

The coming sessions will likely determine whether this is a standard reset within an established uptrend or the start of a broader recalibration driven by megacap exhaustion and reduced expectations for near-term Fed easing. For now, the index remains on trend, but the pace and confidence behind the advance have shifted.

In earlier analysis, we highlighted the S&P 500’s reliance on a narrow megacap leadership and warned that any synchronized weakness across high-multiple tech could force the index back toward its channel median. This week’s reaction follows that path, placing emphasis on how the index behaves around the 6,685 support band.

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