Artificial-intelligence shares turned lower oil prices and softer Treasury yields into a strong close.
Good evening. This is the CAMS Closing Market Recap for Monday, September 21, 2026.
Artificial-intelligence shares turned lower oil prices and softer Treasury yields into a strong close. The Nasdaq Composite gained about 2.3%. The S and P 500 rose about 1.5%. The Dow added about 0.7%, and the Russell 2000 gained about 0.5%.
Participation was positive without matching the strength of the largest technology names. The Nasdaq screener showed 3,662 advancing issues and 2,988 decliners. Reported volume across those rows totaled about 10.5 billion shares. That is a screener-row total, not consolidated exchange volume.
Communication services gained about 3.9%, technology rose about 2.9%, and semiconductors climbed about 4%. Energy fell about 2.3%. Among the remaining sector groups, real estate, health care, financials, industrials and consumer discretionary finished higher while staples, utilities and materials declined.
The largest moves sat inside the AI trade. Intel gained about 12%. Meta rose about 11%. Advanced Micro Devices added about 10% and crossed $1 trillion in market value during the session. Arm climbed about 17%.
Oil was the day's biggest cross-asset change. West Texas Intermediate traded near $95 a barrel, down about 4.9%. Brent was near $100, down about 3.7%. The 10-year Treasury yield finished just under 5%, and the two-year yield was about 4.8%.
Dollar-index futures were near 100 and up about 0.2%. Gold was just under forty-four hundred dollars and fell about 1%. The V I X held near 15 and changed little, even as the Nasdaq rallied.
The drop in crude eased immediate inflation pressure, but refined-fuel stress did not clear. Reuters reported that U.S. diesel moved above $6 a gallon for the first time on record this month. Diesel inventories were nearly 15% below their five-year seasonal average. Export disruptions from Russia and the Middle East remain a physical supply risk.
Monday's economic signal was softer. The Chicago Fed National Activity Index fell to minus 0.04 in August from a revised positive 0.08 in July, a reading just below historical-trend growth. The Federal Reserve raised its target range last week to 3.75% through 4%, so lower oil and one soft activity reading do not settle the rate outlook.
The next test is whether the AI rally can broaden while crude stays lower and the 10-year yield remains below 5%. Thursday's U.S.-China summit is another policy risk for trade and artificial intelligence.
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