S&P 500 Hits Record High Ahead of Nvidia Earnings, Chip Stocks Lead AI Rally

Riding the ongoing AI wave, U.S. stocks have reached another historic moment. This week, as the world's most valuable chipmaker Nvidia prepares to release its latest quarterly earnings, the S&P 500 index hit a record high amid heightened investor expectations. This milestone not only underscores robust confidence in AI infrastructure spending but also highlights the semiconductor sector's absolute dominance as the market's core engine.

Chip Stocks Lead: From 'Magnificent Seven' to Broad Market Rally

The recent U.S. stock rally has a distinct structural characteristic—semiconductors are the undisputed leaders. Beyond Nvidia, chip stocks like AMD, Broadcom, and TSMC (ADR) have posted strong gains, propelling the Philadelphia Semiconductor Index higher. Notably, this rally is no longer confined to a few tech giants but is spreading across the broader supply chain: from upstream lithography equipment and memory chips to downstream server manufacturing and data center operators, nearly the entire AI hardware ecosystem is attracting capital inflows.

Market observers attribute this diffusion effect to investors repricing the AI capital expenditure cycle. As Microsoft, Google, Amazon, and other cloud service providers announce increased AI-related budgets for 2025, the market widely believes that robust chip demand will persist at least through mid-next year. In this context, Nvidia's earnings are not just a single company's results but are viewed as a 'stress test' for the entire AI supply chain.

Pre-Earnings Betting Sentiment: Options Market and Fund Flow Signals

Ahead of Nvidia's earnings, the options market has shown unusual activity. According to CBOE data, the volume ratio of Nvidia call options to put options has risen to multi-year highs, indicating traders are actively positioning for post-earnings upside. Meanwhile, EPFR data shows that active funds focused on tech stocks recorded a fifth consecutive week of net inflows, with most capital directed toward the semiconductor sub-sector.

This optimism is not unfounded. Fundamentally, Nvidia's data center revenue grew more than 100% year-over-year last quarter, and market expectations for delivery of its next-generation Blackwell architecture chips are extremely strong. Several analysts noted in pre-earnings reports that as long as Nvidia's revenue guidance does not fall more than 15% below consensus, the stock is likely to maintain its upward trajectory. However, cautious voices warn that current prices already factor in excessive perfection, and any data falling short of ultra-high expectations could trigger sharp volatility.

S&P 500 Record High: Improving Breadth but Lingering Concerns

The S&P 500 hit an all-time high this week, but a closer look at its composition reveals improved market breadth compared to a few months ago. According to S&P Dow Jones Indices, as of Tuesday, about 65% of index constituents were trading above their 50-day moving average, up from 55% a month earlier. This shift indicates that upward momentum is broadening from a few mega-cap stocks to mid-caps and some cyclical names. For instance, industrial and materials sectors have also strengthened recently due to expectations of AI-driven electricity demand.

However, the sustainability of this 'broad rally' remains questionable. On one hand, the Fed's monetary policy path is still uncertain—although the market widely expects a rate cut in September, recurring inflation data could disrupt the timeline. On the other hand, AI-related valuations are at historic highs: according to FactSet, the S&P 500 information technology sector's forward P/E ratio stands at about 28x, significantly above its five-year average. If Nvidia's earnings fail to provide a sufficiently strong catalyst, profit-taking pressure could quickly spread.

Historical Precedent: How Earnings Influence Market Direction

Over the past two years, Nvidia's earnings have become a 'watershed' event for U.S. stocks. In May 2023, its strong guidance directly ignited the AI trading frenzy, driving the Nasdaq up about 15% over the following three months. In August 2024, despite the earnings beat, the market experienced a brief pullback due to valuation concerns, but later rallied again on rate-cut expectations.

This 'earnings-sentiment-liquidity' transmission chain is particularly critical in the current environment. Analysts point out that if Nvidia's report meets both conditions—'revenue beat' and 'optimistic guidance'—the S&P 500 could continue its upward climb in the short term. Conversely, any signs of slowing growth could trigger a broad AI sector correction and drag the index back down, erasing recent gains.

Outlook: Beyond Earnings, Watch Policy Signals

Apart from Nvidia's earnings, investors should closely monitor two external variables. First, Federal Reserve Chair Jerome Powell's speech at the Jackson Hole symposium, where markets will seek clues on the magnitude of a September rate cut. According to the CME FedWatch tool, the market currently prices about a 70% probability of a 25 basis point cut in September, but a rebound in inflation data could quickly alter these expectations.

Second, the latest developments in U.S. government export controls on chips to China. Reports suggest the Biden administration is considering further tightening restrictions on high-end AI chip exports, which could impact Nvidia's revenue prospects in the Chinese market. Although the company has repeatedly stated it will develop compliant chips for the Chinese market, policy uncertainty remains a sword of Damocles hanging over the stock.

Overall, U.S. stocks are in a 'sweet spot' dominated by the AI narrative, but risks and opportunities coexist. For investors, Nvidia's earnings are not only a short-term trading barometer but also a litmus test for the strength of the AI industry trend. Regardless of the outcome, market volatility is expected to rise significantly, and whether the S&P 500 can hold its record highs may depend on the market's recalibration of the balance between 'growth' and 'valuation.'