August 9, 2025 — Markets have entered a period of heightened exuberance, with several major technology and mega-cap stocks exhibiting overbought conditions, as measured by popular technical indicators like the Relative Strength Index (RSI). Leading the pack are household names such as Apple Inc. (AAPL) and Alphabet Inc. (GOOGL), which have seen their share prices soar on the back of strong earnings, robust demand, and ongoing momentum in artificial intelligence (AI) and cloud computing sectors.

According to Refinitiv data, Apple's stock recently posted an RSI above 80, far surpassing the overbought threshold of 70, while Alphabet is not far behind. Historically, RSI readings above 70 indicate stocks that may be due for a temporary pullback or consolidation, especially after sharp rallies.

The Surge Behind the Surge

Apple and Alphabet have both delivered blockbuster financial results in the recent quarter. Apple reported a 15% year-over-year increase in quarterly revenue, driven by the successful launch of new hardware and robust services growth. Alphabet, meanwhile, saw a 19% increase in advertising revenue and continued to reap gains from its dominance in search, YouTube, and Google Cloud platforms.

This relentless growth has fueled rampant investor enthusiasm, with hedge funds and retail investors alike piling into these names. According to Goldman Sachs, technology stocks now make up over 30% of the S&P 500 by market capitalization—a new historic high. Both Apple and Alphabet hit fresh all-time highs in early August, pushing the broad technology sector higher.

Technical Red Flags: What is Overbought?

The Relative Strength Index (RSI) is one of the most widely watched technical metrics in the investing world. When RSI climbs above 70, it signals that a stock may have gone up too quickly, potentially outpacing fundamental value.

Besides Apple and Alphabet, several other titans—Microsoft, Nvidia, and Amazon—are also showing signs of excessive momentum. According to data compiled by FactSet, around 18% of the S&P 500 constituents are currently trading with RSI readings north of 70—the highest proportion since 2021.

Factors Fueling the Rally

• Earnings Beats: Tech giants have consistently outperformed analyst estimates, helping justify higher valuations.
• AI Momentum: Companies like Apple and Alphabet are integrating AI across products and services, which has captivated the market and kept investors bullish.
• Institutional Buying: Funds and ETFs continue to allocate heavily to large-cap tech for perceived safety and growth potential.
• Low Volatility: Despite concerns about higher-for-longer interest rates, the VIX (volatility index) remains subdued, showing complacency among investors.

Risks: What Goes Up…

While strong earnings have underpinned much of the rally, there are increasing warnings from strategists that these overbought readings herald elevated near-term risk. Historically, stretches in RSI for major indices or stocks are often followed by brief corrections or momentum slowdowns as investors lock in profits.

Additionally, macro headwinds such as persistent inflation, global economic uncertainty, and the looming possibility of interest rate hikes by the Federal Reserve add further cause for caution. UBS and Morgan Stanley analysts have highlighted that high concentration in a few tech names exposes the broader market to outsized swings should sentiment quickly shift.

Investor Strategies in Overbought Conditions

For investors, navigating markets dominated by overbought stocks can be challenging. Experts recommend the following approaches:

• Trim Exposure: Consider taking partial profits in stocks or ETFs showing extreme overbought signals.
• Rebalance: Rotate some capital into underappreciated sectors such as healthcare, energy, or consumer staples.
• Use Stop-Losses: Protect gains by setting disciplined stop-loss orders to limit downside risk.
• Focus on Fundamentals: Avoid chasing momentum and ensure investments still meet long-term growth and valuation criteria.

According to investment firm BlackRock, maintaining a diversified portfolio is more important than ever, as periods of rapid price appreciation can be swiftly followed by corrections.

Outlook for the Market

As Wall Street enters the later stages of summer, all eyes will remain on upcoming inflation data and future Federal Reserve guidance. The market is now betting heavily that the Fed will remain data-dependent, but any surprise hawkish move could trigger a selloff, particularly in overextended technology stocks.

Despite signs of being overbought, Apple and Alphabet maintain strong business fundamentals and strategic positioning in AI, cloud, and next-generation hardware. Innovations launched in 2025, including Apple’s new AR devices and Alphabet’s advancements in AI-powered search, may pave the way for ongoing growth even if volatility picks up in the short term.

Still, with equity fund inflows at multi-month highs and valuations near record levels, investors would be wise to exercise caution and review their portfolio exposure to these star performers.