The technology sector's romance with artificial intelligence is showing signs of strain, with semiconductor stocks enduring their most severe weekly decline since March 2025 as profit-taking spreads across global markets. The Philadelphia SE Semiconductor Index has plummeted 11% this week, a sharp reversal that underscores mounting scepticism about whether the spectacular gains in chip stocks can be sustained. This downturn represents a dramatic shift from the bullish sentiment that has characterised much of the year, with the semiconductor sector now teetering on the edge of entering bear market territory, having shed nearly 24 percent from its late June pinnacle.
The retreat in chip stocks reflects a confluence of factors that have prompted investors to reassess their conviction in technology equities. Despite having climbed nearly 60 percent year-to-date through early Friday trading, semiconductor shares have become vulnerable to the kind of profit-taking that inevitably follows sustained rallies. According to Toni Meadows, head of investment at BRI Wealth Management, the pullback represents investors grappling with the sustainability question that has long shadowed semiconductor stocks. The sector had priced in exceptionally optimistic demand scenarios for what has historically been a cyclical industry, leaving valuations exposed to any sign of hesitation in capital spending plans among technology giants.
The sell-off has claimed some of the sector's most celebrated names. Nvidia, the darling of the AI revolution, fell 3.4 percent on Friday, while Advanced Micro Devices declined 4.9 percent and Applied Materials dropped 6.5 percent. Memory chip manufacturers also felt the pressure, with Micron and SanDisk each shedding around 1 percent. South Korea's SK Hynix, which briefly dipped below its offering price, managed to reverse course and post a 4 percent gain, though the stock remains down more than 5 percent across the week. These declines signal that even market leaders in the semiconductor space are not immune to the broader loss of confidence in AI-driven valuations.
Several developments this week have crystallised investor concerns about the return on investment from hefty AI expenditures. Chinese artificial intelligence startup Moonshot unveiled Kimi K3, described as a 2.8 trillion-parameter model representing the world's largest open-weight AI system, reigniting questions about how quickly Chinese competitors might challenge American technological dominance. Simultaneously, a report surfaced suggesting that Alphabet's Google is running months behind schedule on releasing Gemini 3.5 Pro, its flagship AI model. These announcements underscore the reality that the AI landscape remains deeply uncertain, with unexpected competition and delayed product launches capable of disrupting carefully laid plans for returns on massive capital investments.
The weakness in semiconductor stocks reflects a broader rotation sweeping through technology-exposed equities across the world. South Korea's KOSPI index confirmed its entry into bear market territory last week, despite remaining up nearly 62 percent for the year, signalling that even markets with substantial exposure to AI beneficiaries are experiencing sharp corrections. Japan's Nikkei tumbled into correction territory on Friday, extending the pattern of technology stock volatility that has gripped Asian markets. European technology stocks, which achieved their strongest quarterly performance since 2001 in June, now rank among the sector's worst performers this week, demonstrating how quickly sentiment can shift in crowded trades.
The momentum shift in American markets has been equally pronounced. The S&P 500 Momentum Index, which had outperformed the benchmark S&P 500 by more than two-to-one throughout the year, has retreated 10 percent in July while the broader market declined just 0.8 percent. This dramatic divergence highlights how concentrated gains had become in a handful of high-flying technology stocks, creating conditions ripe for the kind of sharp reversal witnessed this week. Investors who had piled into momentum-driven technology plays now face the uncomfortable reality that the easy gains may have already been captured.
Remarkably, positive earnings guidance from industry heavyweights has done little to arrest the decline. Taiwan's TSMC, the world's largest chip manufacturer, and ASML, Europe's leading semiconductor equipment maker, both delivered strong forecasts that would normally provide support for the sector. Yet these encouraging signals proved insufficient to counter the weight of profit-taking and fundamental reassessment occurring across the marketplace. The disconnect between corporate guidance and stock performance suggests that investors are wrestling with deeper questions about the overall health and sustainability of the AI investment thesis rather than concerns about individual company performance.
The technology sector downturn extends beyond semiconductors into other AI-adjacent areas. SpaceX experienced a significant setback when its Starship's 13th flight test was aborted at the last second, a failure that exacerbated the stock's slide below its USD 135 per share IPO price earlier in the week. Other space-related companies also struggled, with Intuitive Machines falling 1.6 percent and Virgin Galactic declining 2.3 percent on Friday after having rallied earlier in the year in anticipation of a SpaceX-driven sector boost. The deterioration in space stocks underscores how the recent technology rally lifted numerous beneficiary sectors, all of which are now vulnerable to the reversal currently underway.
For Malaysian and Southeast Asian investors, this market dynamic carries particular significance given the region's substantial exposure to semiconductor manufacturing and technology supply chains. Many regional portfolios and funds have benefited from the year-long surge in chip stocks, and the current weakness presents both challenges and opportunities depending on individual investment timeframes and conviction levels. The region's technology sector composition means that understanding the drivers of this correction and assessing whether it represents a temporary pause or a more fundamental reassessment of AI valuations remains crucial for navigating the months ahead.
Investor attention now focuses on upcoming earnings announcements from technology titans. Alphabet and Tesla, both members of Wall Street's so-called 'Magnificent Seven' group of mega-cap technology stocks, are scheduled to report quarterly results next week alongside semiconductor company Intel. These earnings releases represent critical opportunities for company management to address investor concerns about capital allocation, returns on AI investments, and the sustainability of current spending trajectories. The guidance provided during these earnings calls could either restore confidence in the technology sector's fundamentals or deepen concerns about whether the AI investment cycle has become overextended, making these announcements pivotal for determining whether the current pullback represents healthy profit-taking or the beginning of a more substantial market repricing.
