June 29 Stock Market Report: Big Tech Mixed Amid AI Sector Volatility; Nvidia, Apple Decline

Mixed Big Tech Performance Amid AI Sector Volatility: June 26, 2026 Stock Market Trend Analysis

On June 26, 2026, global stock markets saw increased volatility amid ongoing debates about the profitability of artificial intelligence (AI) related companies. Fluctuations were particularly pronounced in technology stocks, especially within the semiconductor sector, which significantly impacted the KOSPI market. On this day, the U.S. stock market saw the S&P 500 index fall by 1.95%, while the tech-heavy Nasdaq index plunged by 4.60%. In contrast, the Dow Jones Industrial Average, comprising blue-chip stocks, showed relative resilience with a marginal decline of 0.00%. This trend was reflected in the domestic market, with the KOSPI index dropping by 7% week-over-week, down 641.21 points, indicating an overall weak performance.

Key Tech Stock Data and Analysis: Nvidia, Apple, Micron, etc.

As of the closing prices on June 26, 2026, key technology companies' stock prices, market capitalization, and valuation metrics are as follows:

Stock	Current Price	Change (%)	Market Cap	PER	EPS Growth (%)
Nvidia (NVDA)	195.74 KRW	-0.02%	4.74 trillion KRW	29.9	6599.3%
Alphabet A (GOOGL)	343.71 KRW	-0.00%	4.19 trillion KRW	26.2	3419.4%
Alphabet C (GOOG)	342.19 KRW	-0.01%	4.18 trillion KRW	26.1	-
Apple (AAPL)	275.15 KRW	-0.06%	4.04 trillion KRW	33.4	2258.6%
Microsoft (MSFT)	352.83 KRW	-0.03%	2.62 trillion KRW	21.0	1551.4%
Amazon (AMZN)	227.01 KRW	-0.03%	2.44 trillion KRW	31.7	2879.9%
TSMC (TSM)	434.99 KRW	-0.01%	2.26 trillion KRW	37.5	4430.2%
Broadcom (AVGO)	378.91 KRW	-0.01%	1.80 trillion KRW	62.9	-
Tesla (TSLA)	375.12 KRW	-0.00%	1.41 trillion KRW	344.1	-4709.0%
Meta Platforms (META)	542.87 KRW	-0.03%	1.38 trillion KRW	19.7	-256.0%
Micron (MU)	1,213.56 KRW	+0.16%	1.37 trillion KRW	27.4	-
ASML (ASML)	1,841.18 KRW	+0.04%	0.71 trillion KRW	62.5	-
Intel (INTC)	132.87 KRW	+0.01%	0.67 trillion KRW	-	9865.5%
AMD (AMD)	532.57 KRW	+0.03%	0.87 trillion KRW	178.7	16435.6%

Nvidia closed down 0.02% at 195.74 KRW but demonstrated its status as a core driver of the AI market with an impressive EPS growth rate of 6,599.3%. Competitor AMD rose 0.03% to 532.57 KRW, but its P/E ratio of 178.7x, significantly higher than Nvidia's, suggests substantial valuation pressure. TSMC saw a 0.01% dip to 434.99 KRW but highlighted the importance of the semiconductor supply chain with a high EPS growth rate of 4,430.2%.

Apple declined 0.06% to 275.15 KRW, maintaining a market capitalization of 4.04 trillion KRW. While its EPS growth rate of 2,258.6% is positive, a P/E ratio of 33.4x indicates a premium valuation. Microsoft was down 0.03% at 352.83 KRW; despite a relatively lower P/E of 21.0x, it maintained investment appeal with a robust EPS growth rate of 1,551.4%. Amazon also fell 0.03% to 227.01 KRW, with a P/E of 31.7x and EPS growth of 2,879.9%, reflecting expectations for expansion in AI-related businesses.

Conversely, Micron rose 0.16% to 1,213.56 KRW, achieving a market capitalization of 1.37 trillion KRW. Tesla closed virtually unchanged at 375.12 KRW, but its exceptionally high P/E ratio of 344.1x and negative EPS growth of -4,709.0% clearly show that its current valuation relies heavily on optimistic future market expectations. Meta Platforms fell 0.03% to 542.87 KRW; while its P/E of 19.7x is attractive, its EPS growth rate of -256.0% raises concerns about profitability.

Market Impact and Industry Trends: Polarization in the Semiconductor Sector

Recent market movements highlight a coexistence of optimism surrounding AI technological advancements and uncertainty regarding the realization of actual profits. The semiconductor sector, in particular, seemed to maintain positive momentum due to rising demand for high-performance chips essential for AI computational power, but data from the 26th indicated an overall adjustment phase. Key companies like Nvidia, AMD, and TSMC continue to receive market support based on high EPS growth rates, which are acting as a prerequisite to justify their very high valuations.

According to Yonhap News, large-cap semiconductor-related stocks on the KOSPI have shown significantly better performance compared to other stocks, exacerbating market polarization. This is also confirmed by analyses from Senior Research Fellow Kang So-hyun of the Korea Capital Market Institute, showing that the strong performance of specific large-cap stocks is dictating the overall market trend. This situation also influences investment culture, with capital pouring into the so-called 'Top Two' semiconductor stocks, leading to the relative marginalization of other sectors.

Meanwhile, news that Kioxia employees in Japan became billionaires through company stock ownership hints at the potential for value appreciation in the memory semiconductor market. This can be interpreted as reflecting expectations for the recovery and growth of the NAND flash market in the long term.

Investment Implications and Future Outlook

The current market environment is characterized by the intersection of the grand trend of AI technological development and the practical challenges of individual company profitability and valuation pressure. Leading AI companies like Nvidia continue to exhibit strong growth potential, but their P/E ratio of 29.9x could become a trigger for stock corrections if future earnings growth slows down. Furthermore, the case of Tesla clearly demonstrates that stock prices cannot be sustained by high expectations alone.

Companies like Microsoft, which maintain solid growth rates and relatively reasonable valuations, remain attractive investment opportunities. Apple and Amazon are also expected to have further upside potential if their AI-related new businesses show tangible results. However, while Intel recorded an astounding EPS growth rate of 9,865.5%, the absence of PER information makes precise valuation difficult, though it suggests potential for a rebound.

Going forward, the market is expected to continue experiencing volatility based on the AI industry's actual profit-generating capabilities and valuation adjustments. Investors are urged to adopt a cautious approach, comprehensively considering individual companies' financial health, growth potential, and changes in the market environment. Particularly, a strategy of managing portfolios based on objective data and analysis, rather than being swayed by excessive optimism or pessimism, will be necessary. Index-tracking ETFs such as Vanguard S&P 500 ETF (VOO) or SPDR S&P 500 ETF (SPY) can serve as alternatives for investing in the overall market trend amidst the high volatility of individual stocks.