US Stocks Split: Nasdaq Hits Record High, S&P 500 Under Pressure as Sector Rotation Accelerates

Market Overview: Tech Alone Can't Support the Market, Cyclicals Drag S&P

Wednesday's US stock market closed with a notable divergence: the tech-heavy Nasdaq continued its strength, setting another record closing high; meanwhile, the broader S&P 500 index slipped into negative territory, pressured by collective weakness in cyclical sectors like energy and financials. The Dow Jones Industrial Average also showed weakness, posting the largest decline among the three major indices. This rotation pattern of "strong tech, weak cyclicals" reflects a delicate balance in market funds between Federal Reserve policy expectations and economic growth prospects.

Behind the Nasdaq's New High: AI Boom and Megacap Drivers

The core driver behind the Nasdaq's record run remains the ongoing momentum in the AI supply chain. According to multiple financial media reports, large-cap tech and semiconductor leaders showed resilience during intraday trading, with heavyweights like Nvidia and Microsoft making significant contributions to the index. Optimism about AI computing demand has not been dampened by recent fluctuations in some economic data, and funds continue to flow into the tech sector. Additionally, better-than-expected earnings from several major internet platform companies further solidified the Nasdaq's leadership.

S&P Under Pressure: Energy and Financials Drag, Defensives Show Divergence

In stark contrast to the Nasdaq's strength, the S&P 500 index fluctuated lower, dragged down by energy, financial, and industrial sectors. International oil prices have recently retreated due to demand concerns, leading to widespread declines in energy stocks; at the same time, a slight uptick in long-term Treasury yields put pressure on high-valuation financial stocks. Notably, defensive sectors such as utilities and consumer staples showed relative resilience, indicating that some funds are seeking safety at index highs. This rapid sector rotation has skewed the S&P 500's advance-decline ratio clearly to the negative side.

Macro Data and Policy Expectations: Market Bets on Rate Cut Timing

This week's US economic data has been mixed. On one hand, the flash services PMI came in better than expected, showing that economic resilience remains; on the other hand, consumer confidence indices have declined, raising concerns about weak demand. According to the CME FedWatch tool, federal funds futures currently price in about a 70% probability of a 25-basis-point rate cut at the Fed's September meeting, but expectations for the number of cuts this year have narrowed compared to the start of the year. This shift in expectations has led to a steeper Treasury yield curve, pressuring cyclical stocks that are sensitive to borrowing costs, while tech stocks continue to command a premium due to their earnings growth certainty.

Fund Flows and Market Sentiment: Accelerated Rotation, Low Volatility

In terms of fund flows, according to EPFR Global data, global equity funds still recorded net inflows over the past week, but the majority went to tech and communication services sectors, while cyclical industry funds such as energy and materials saw net redemptions. This extreme sector concentration has raised concerns among some strategists, who believe that narrowing market breadth could increase the risk of a pullback. However, the CBOE Volatility Index (VIX), which measures market fear, remains near historical lows, indicating that investor sentiment is still broadly optimistic. Options market data shows that the put/call ratio is at recent highs, with bullish sentiment dominating.

Outlook: Focus on Earnings Season and Policy Signals

Looking ahead, the market's focus will shift to upcoming earnings reports from large tech companies and public comments from Federal Reserve officials. If tech giants continue to beat expectations, the Nasdaq could extend its upside; but if cyclical sectors remain weak, the S&P 500's adjustment pressure may intensify. Additionally, the US Treasury's upcoming quarterly refunding announcement will influence long-end yields, which could disturb equity valuations. Overall, until macro data and policy paths become clearer, the divergence at the index level is likely to persist, and investors should be wary of increased volatility in high-flying sectors.