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The AI theme is supporting the markets

24 Sep 2026 | 2 min read
Semiconductor microchip on a circuit board, representing AI computing, data processing, and advanced technology.

After last week’s brief market volatility, triggered by the Federal Reserve’s 0.25 percentage point rate hike and hawkish messaging, stock markets have shown remarkable resilience. Investor attention has shifted back to the market's strongest performers, specifically the AI and semiconductor sectors, which have once again propelled US indices close to all-time highs. Meanwhile, falling oil prices and stabilizing conditions in the bond market are providing the stock market with some much-needed breathing room.

AI and semiconductors at the forefront again

Looking at the various sectors, capital has flowed back particularly into the technology sector (XLK) and semiconductors (SMH). Recent gains in the technology sector have been supported by semiconductor manufacturing companies, such as Nvidia, AMD, and many others, which have performed wellover the past week and the beginning of this week.

Compared to many other sectors, the difference is clear. Many other sectors (such as XLE, XLU, XLB, XLP) are actually in a clear downtrend. This means that the indices are currently largely driven by the technology and semiconductor sectors alone.

However, elevated interest rates could increase financing costs for companies investing heavily in data centres and artificial intelligence. Conversely, many companies in the sector have virtually full order books, and the outlook for the remainder of the year and beyond is positive. Consequently, companies that have underperformed relative to industry leaders may find themselves under particular pressure in the current higher interest rate environment.

XLK, 5-year chart

XLK Technology Select Sector SPDR Fund shown in a five-year chart highlighting long-term price performance.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

XLK, 1-year chart

XLK one-year daily chart showing price performance, trend direction, and key support and resistance levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

SMH, 5-year chart

SMH five-year weekly chart showing long-term price performance, trend direction, and key support levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

SMH, 1-year chart

SMH one-year daily chart showing price performance, trend direction, and key support and resistance levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

The pullback in oil prices is boosting stocks.

Another key factor supporting the stock market is the drop in crude oil prices. Brent crude, which had previously traded at around $110 per barrel, has fallen to closer to $100. This has given the stock market with at least a temporary reprieve while also easing inflation expectations for the autumn.

Falling energy prices play a particularly significant role in industry-heavy Europe. However, a sharp rise in energy prices could quickly have a negative impact on global stock markets.

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BRENT, 5-year chart

Brent crude oil five-year weekly chart showing long-term price performance, trend direction, and key levels.
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BRENT, 1-year chart

Brent crude oil one-year daily chart showing price performance, trend direction, and key support and resistance levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

S&P 500 and NASDAQ surging

In the United States, the S&P 500 and NASDAQ indices have performed strongly following the Fed's interest rate decision and press conference last week. Both indices have risen close to their previous all-time highs.

The key driving forces behind this have been, in particular, the strong upward momentum in the technology and semiconductor sectors, the drop in oil prices, and a moderate decline and subsequent stabilization of bond yields. If the upward momentum in these sectors begins to fade, or if energy prices and interest rates turn upward again, the indices could face significant headwinds.

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S&P 500, 5-year chart

S&P 500 five-year weekly chart showing long-term price performance, trend direction, and key support levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

S&P 500, 1-year chart

S&P 500 one-year daily chart showing price performance, trend direction, and key support and resistance levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

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NASDAQ, 5-year chart

Nasdaq-100 five-year weekly chart showing long-term price performance, trend direction, and key support levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

NASDAQ, 1-year chart

Nasdaq-100 one-year daily chart showing price performance, trend direction, and key support and resistance levels.
Source: TradingView. Note: Past performance is not a reliable indicator of future results.

Summary

Following concerns over interest rates, investor confidence in the staying power of the AI ​​theme has turned the stock market’s direction around. While the tight interest rate stance of central banks and oil prices hovering near $100 conitnue to pose macroeconomic risks present, the earnings power of tech giants and investments in AI are currently acting as the market's strongest drivers.

Indicators shown on the charts:

  • SMA200: 200-Day Moving Average, red.
  • SMA50: 50-Day Moving Average, blue.
  • EMA25: 25-Day Exponential Moving Average, yellow.

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External author:

This information is in the sole responsibility of the guest author and does not necessarily represent the opinion of Bank Vontobel Europe AG or any other company of the Vontobel Group. This information is sponsored by Bank Vontobel Europe AG, which may be a counterparty to transactions involving the financial instruments discussed in this information. The further development of the index or a company as well as its share price depends on a large number of company-, group- and sector-specific as well as economic factors. When forming his investment decision, each investor must take into account the risk of price losses. Please note that investing in these products will not generate ongoing income.

The products are not capital protected, in the worst case a total loss of the invested capital is possible. In the event of insolvency of the issuer and the guarantor, the investor bears the risk of a total loss of his investment. In any case, investors should note that past performance and / or analysts' opinions are no adequate indicator of future performance. The performance of the underlyings depends on a variety of economic, entrepreneurial and political factors that should be taken into account in the formation of a market expectation.

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