U.S. stocks resumed trading after the Labor Day holiday with all three major indexes lower on Tuesday (the 8th), as rising oil prices revived inflation concerns. The Dow Jones Industrial Average fell 628 points, or 1.18%, to 52,786; the S&P 500 lost 45 points, or 0.58%, to 7,673; and the Nasdaq Composite declined 85 points, or 0.32%, to 26,421. Semiconductor shares diverged sharply, with the Philadelphia Semiconductor Index gaining 1.3% and approaching 12,000. Intel surged 9.05% amid market chatter that it could raise PC CPU prices by as much as 10%, while AMD climbed 5.90% to $505.74 after Chief Financial Officer Jean Hu said the artificial intelligence market could reach $2 trillion to $3 trillion by 2030. Qualcomm rose 3.17% after signing a long-term agreement with Amazon to co-develop custom chips and optical interconnect technology for AI data centers. Broadcom, Applied Materials and South Korea's SK Hynix also advanced. The gains were concentrated in several chip leaders rather than reflecting a broad-based sector rally, as Nvidia, Microchip Technology, Astera Labs and ON Semiconductor declined. Investors also rotated away from Apple and Microsoft toward semiconductor and optical networking companies, while Tesla gained nearly 4%. Markets are now focused on the Consumer Price Index (CPI), a measure of consumer inflation, and Federal Reserve officials' comments on interest rates. Continued oil-price gains could reinforce expectations for higher rates for longer, although sustained AI demand may support continued relative strength in semiconductor stocks.