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S&P 500 Gains 11% Amid Compressed Valuations

By Markets Desk · 2026-09-19 · 2 min read
A tightly wound mechanical spring resting on a wooden desk
Illustration: Tradingbird

S&P 500 up 11% YTD. AI CAPEX set to reach $889B. Valuations near 7-year lows. Fed hikes rates.

The S&P 500 Index has gained 11% year-to-date through mid-September. This performance masks a compressed valuation environment. Market data suggests stocks are under pressure, ready for a sharp move. Analysts describe the setup as a coiled spring. The index has averaged these returns over 9.5 months.

Investors face conflicting signals. AI infrastructure spending is booming. Meanwhile, energy prices hit $5 per gallon due to geopolitical conflict. Bullish investors currently hold the advantage. Evidence points to violent upward potential. The market environment is complex but data-driven.

AI Spending Surges Despite Fears

AI CAPEX is projected to rise from $741 billion to $889 billion. This represents 2.5% of GDP. Skepticism has driven valuations down. AI stocks trade at 20x forward earnings. This aligns with the broader market. NVIDIA trades near a 7-year low multiple. The forward P/E premium has shrunk to zero.

RBC data shows a historical 30% P/E premium for AI. Current sentiment has erased this gap. Big tech CEOs are accelerating bets. Headlines focus on risk. Numbers show commitment. The largest industrial buildout since the 1800s is underway. Valuations reflect caution, not fundamental weakness.

Earnings Growth Accelerates In 2026

S&P 500 earnings are estimated to grow 28.3% in 2026. This is the fastest growth outside a post-recession period. Tech sector earnings jumped 101.2% in Q2. Micron and AMD led the surge. SanDisk EPS growth is projected at 368.9% this quarter. Next quarter growth is estimated at 728.23%.

Zacks Consensus Estimates drive these figures. Growth is not limited to one company. Broad tech participation is evident. SK Hynix and AMD contribute to the total. The earnings base is expanding rapidly. This growth supports the current price levels. Fundamentals are stronger than sentiment suggests.

Inflation And Rate Hike Risks

The Federal Reserve hiked rates last week. This is the first hike since 2023. One more hike is currently expected. Energy shocks from the U.S.-Iran conflict drive inflation. Historical data shows these shocks last eight months. Efficiency gains in AI infrastructure will lower costs.

GN auto markets/indices: stock index data confirms the trend. Rate hikes are not always negative for stocks. Historical patterns support this view. The energy premium is temporary. Supply chain optimization will follow. The pressure on prices is likely to dissipate. The market setup remains favorable for upside.

Based on reporting by Yahoo! Finance Canada, compiled by the Tradingbird desk.

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