US Market Shift: October Market Rebalancing, AI Cooling and Defensive Sector Rise

US Market Shift: October Market Rebalancing, AI Cooling and Defensive Sector Rise

As we enter mid-October 2026, the US market is undergoing a significant transformation. With the third quarter earnings season nearing its end, market focus is gradually shifting from artificial intelligence (AI) concept stocks to defensive sectors. This rotation not only reflects changes in investor risk appetite but also signals that the market is entering a new structural adjustment phase. For Asian investors, understanding the logic behind this shift and adjusting strategies accordingly will be key to capturing investment opportunities in the coming months.

Macroeconomic Background of the Market Shift

Since early October, the US market has shown clear signs of sector rotation. Technology stocks represented by the Nasdaq index, after leading gains for several consecutive months, have begun to enter a correction phase, while traditional defensive sectors such as utilities, consumer staples, and healthcare have shown relatively strong performance. This shift is not accidental but the result of multiple factors working together.

First, changes in the macroeconomic environment have laid the foundation for this market shift. Although the US economy achieved 3.2% growth in the second quarter of 2026, recent economic data has begun to show signs of cooling. September retail sales grew by 0.3% month-on-month, below the market expectation of 0.5%; the manufacturing PMI has been in contraction territory for two consecutive months; while inflation remains near the Federal Reserve's 2% target, core inflation has proven stickier than most expected. These data collectively point to a potentially slowing economic outlook, prompting investors to reassess the value of risk assets.

Second, the Federal Reserve's policy stance is also undergoing a subtle shift. Although the Fed kept rates unchanged at its September meeting, it removed the phrase "may tighten monetary policy further" from its policy statement, instead emphasizing "careful assessment of more information." This signal has been interpreted by the market as the Fed approaching the end of its rate hike cycle, possibly even signaling a potential rate cut in the fourth quarter of 2026. The shift in rate expectations has lowered bond yields, making high-dividend defensive sectors relatively more attractive.

Deep Reasons Behind AI Sector Cooling

The AI sector led the US market in the first half of 2026 but has clearly cooled since October. AI-related sectors including semiconductors, cloud computing, and software services fell by an average of 4.2% in the first two weeks of October, significantly underperforming the broader market. This cooling phenomenon has multiple underlying reasons.

From a valuation perspective, after the significant rally in 2025-2026, the AI sector has reached historically high valuations. Taking NVIDIA (NVDA) as an example, its forward P/E ratio reached 65 times at the end of September 2026, far above its historical average. High valuations mean that market expectations for future growth of AI-related companies are already quite fully priced in. Once earnings fail to fully match these high expectations, price adjustment pressure will emerge.

From an earnings perspective, although AI concept companies generally achieved strong revenue growth in the second quarter, profit growth has begun to slow. Taking cloud service providers as an example, average revenue grew by 35% year-on-year in the second quarter, but profit growth was only 18%, a significant decline from 42% in the same period last year. This trend indicates that competition in the AI industry is intensifying, cost pressures are emerging, which may affect future profitability.

From a capital flow perspective, hedge funds and other institutional investors are reassessing the investment value of the AI sector. According to the latest 13F filing data, top tech hedge funds reduced their positions in AI leaders like NVIDIA and Microsoft in the third quarter, while increasing allocations to traditional value stocks. This institutional portfolio adjustment often leads market shifts.

Logic and Performance of Defensive Sector Rise

In stark contrast to the AI sector, defensive sectors performed strongly in early October. Traditional defensive sectors including utilities, consumer staples, and healthcare rose by an average of 2.8% in the first two weeks of October, outperforming the broader market. This performance has its own internal logic.

From an economic sensitivity perspective, defensive sectors are typically insensitive to economic cycle changes and show strong resilience during economic slowdowns or recessions. When economic data begins to show signs of cooling, these sectors often attract investors seeking stable returns. For example, utility companies provide relatively stable demand for basic services, generating predictable cash flows, making them favored during economic uncertainty.

From a valuation perspective, defensive sectors have relatively lower valuations. Taking the consumer staples sector as an example, its forward P/E ratio was about 20 times in early October, lower than the technology sector's approximately 35 times. This valuation difference provides defensive sectors with greater safety margins and upside potential, especially against the backdrop of shifting rate expectations.

From a dividend yield perspective, defensive sectors typically have higher dividend yields. The utilities sector has an average dividend yield of about 3.5%, while healthcare is about 2.2%, both higher than the S&P 500's overall level of about 1.8%. Against the backdrop of increasing expectations for declining interest rates, these stable high-yield assets are becoming more attractive to investors.

Significance of Market Shift Signals

US market sector rotation often signals changes in the economic cycle and shifts in investor risk appetite. The rotation from AI sectors to defensive sectors may suggest that the market is shifting from pursuing high-growth, high-risk assets toward more stable, defensive asset allocations.

Historically, this type of rotation typically occurs when the economic cycle shifts from expansion to maturity. In the early and middle stages of economic expansion, investors tend to favor high-growth, high-elasticity technology stocks; when the economy approaches the top of the cycle and growth begins to slow, defensive sectors tend to perform relatively better. The current pattern of AI sector cooling and defensive sector rise may be related to the economic cycle approaching a mature stage.

From a technical analysis perspective, the Nasdaq index has shown high-level oscillation in early October with increased trading volume but stagnant prices, a pattern that often suggests weakening market momentum. Meanwhile, the Dow Jones Industrial Average has shown relatively stronger performance, reflecting the shift of capital from growth stocks to value stocks and from technology stocks to traditional stocks.

Response Strategies for Asian Investors

For Asian investors, the shift in US market direction presents both challenges and opportunities. In the current market environment, adjusting investment strategies to adapt to the new market landscape is crucial.

First, portfolio allocation structures should be re-evaluated. If the portfolio is overly concentrated in AI and technology sectors, consider reducing the weight of these sectors and increasing allocations to defensive sectors. Specifically, the allocation ratio of defensive sectors such as utilities, consumer staples, and healthcare could be increased to 30%-40% of the total portfolio to balance portfolio risk.

Second, focus on technology stocks with defensive characteristics. Not all technology stocks face the same market environment; those with stable cash flows and high dividend payout ratios may be relatively more resilient. For example, while the cloud computing businesses of large tech companies fall within the AI category, they have entered a mature phase with stable growth and strong profitability. Such stocks may still have investment value in the current environment.

Third, consider increasing allocations to high-quality bonds. With expectations shifting toward declining interest rates, the appeal of high-quality corporate bonds and government bonds is rising. Especially for bonds with shorter maturities, capital gains can be achieved in a declining interest rate environment. Meanwhile, bonds can serve as portfolio stabilizers, providing a buffer during stock market volatility.

Fourth, pay attention to diversification opportunities in overseas markets. With the shift in the US market direction, technology stocks in Asia and other emerging markets may perform relatively better. Through cross-market allocation, structural opportunities in different markets can be captured, reducing single-market risk.

Future Market Outlook and Investment Recommendations

Looking ahead to the coming months, the US market may continue to show structural differentiation. The rotation between AI sectors and defensive sectors may not be a short-term phenomenon but reflects deep-seated changes in the economic cycle and investment logic.

In the short term, as the October and November earnings season progresses, the market will closely watch the performance of AI companies. If these companies can demonstrate strong profitability and sustainable growth paths, the AI sector may regain market favor. Conversely, if earnings growth falls short of expectations, sector adjustments may deepen further.

In the medium term, the Federal Reserve's policy direction will be a key factor influencing market trends. If the Fed indeed begins cutting rates in the fourth quarter of 2026, interest-sensitive growth stocks and technology stocks may regain their appeal. But until then, defensive sectors may continue to perform relatively better.

In the long term, artificial intelligence as a disruptive technological force will not diminish due to short-term market shifts. For long-term investors, the current correction in the AI sector may provide an opportunity to position for future growth at more reasonable prices. The key is to select companies with genuine technological advantages, sustainable business models, and reasonable valuations.

For Asian investors, a "core-satellite" investment strategy is recommended: allocate most capital to core assets such as defensive sectors and high-quality bonds to obtain stable returns; while retaining a portion as satellite allocation to capture adjustment opportunities in growth sectors like AI during market volatility. This strategy can control risk while not giving up long-term growth opportunities.

In conclusion, the October 2026 shift in US market direction provides Asian investors with an opportunity to re-examine and adjust their investment strategies. By understanding the logic behind market changes and balancing risk with return, investors can hope to capture structural opportunities in the new market landscape and achieve steady asset growth.