U.S. equity markets turned lower on Tuesday as investors rotated away from high-growth artificial intelligence stocks while renewed geopolitical tensions pushed oil prices sharply higher. Although the Dow Jones Industrial Average briefly reached another record intraday high, the benchmark later retreated below the 53,000 level as weakness across semiconductor shares overshadowed strength in defensive sectors. The session highlighted growing investor caution as elevated market valuations face their first major earnings test of the second half of the year.

Semiconductor Selloff Pressures Technology Stocks

The technology sector led the market decline as semiconductor shares experienced another broad-based selloff. The Nasdaq Composite fell more than 1%, while the S&P 500 also moved lower as investors reduced exposure to some of this year’s strongest performers.

Micron Technology dropped roughly 7%, while KLA, Marvell Technology, Broadcom, and AMD also posted notable losses. The VanEck Semiconductor ETF declined more than 5%, reflecting broad weakness across the chip industry. Market participants cited lofty valuations and increasingly demanding earnings expectations as investors reassessed whether AI-related companies can continue delivering the exceptional growth that has fueled the sector’s rally throughout the past year.

Investor sentiment was also influenced by reports that Chinese artificial intelligence developer DeepSeek is developing its own inference chip. Although still in its early stages, the initiative raised concerns that major AI developers could gradually reduce their dependence on established semiconductor suppliers, increasing long-term competitive pressures within the industry.

Defensive Rotation Gains Momentum

While growth stocks weakened, capital rotated toward more defensive sectors. Healthcare, financials, and selected large-cap technology companies attracted buying interest as investors sought stability amid rising volatility.

Eli Lilly posted gains alongside JPMorgan Chase and Microsoft, while Walmart advanced after announcing additional price reductions on consumer staples including food and beverages. The market rotation suggests investors remain constructive on the broader economy but are becoming increasingly selective after months of AI-driven market leadership.

The Dow Jones Industrial Average ultimately declined roughly 0.4%, while the S&P 500 lost approximately 0.5%, reflecting a relatively orderly rotation rather than widespread risk aversion.

Oil Prices Add Another Layer of Market Uncertainty

Energy markets added further pressure after reports that Iran attacked a Qatari liquefied natural gas tanker near the Strait of Hormuz. Brent crude climbed about 3% to $74.16 per barrel, while West Texas Intermediate settled near $70.44. Prices extended gains after trading hours following reports that the United States revoked a waiver permitting the sale of Iranian oil.

International markets also contributed to weaker sentiment. South Korea’s Kospi Index fell sharply after Samsung Electronics declined despite reporting stronger quarterly profits, highlighting investor concerns that robust earnings alone may no longer satisfy elevated market expectations. European equities also finished lower as investors positioned ahead of the upcoming corporate earnings season.

Looking ahead, investors will closely monitor second-quarter earnings reports for confirmation that corporate fundamentals continue to justify premium valuations, particularly within artificial intelligence and semiconductor companies. At the same time, developments surrounding Middle East tensions, oil prices, and China’s AI ambitions will remain key variables influencing market direction as the second half of 2026 unfolds.