Nasdaq Hits Record High as AI Shares Surge While Broader Markets Finish Mixed

The Dow fell 185.14 points, or 0.36%, to 51,863.69, while the Nasdaq rose 0.45% to a record 27,244.28; the S&P 500 was essentially unchanged at 7,764.64.
The session highlighted a rotation toward growth and technology stocks and away from traditional industrial and value shares, with the Nasdaq outperforming the Dow.
JPMorgan, Wells Fargo and Morgan Stanley each fell about 4% as the rebound in borrowing costs weighed particularly heavily on credit-sensitive banks.
Meta shares gained 13% over two sessions following strong investor reception for the company’s Muse AI agent, providing a major catalyst for the broader AI trade.
Sandisk advanced after Rosenblatt upgraded the stock, adding to gains among AI-related and infrastructure companies.
U.S. stocks closed mixed on Tuesday, September 22, as technology shares surged while banks stumbled. The Nasdaq hit a record high, climbing 0.45% to 27,244.28, but the Dow fell 185.14 points, or 0.36%, to 51,863.69. The S&P 500 stayed flat at 7,764.64. Higher interest rates and President Trump's tough talk on Iran rattled investors and squeezed bank stocks.
Artificial intelligence stocks led the charge. Meta jumped 13% over two trading sessions after unveiling its new Muse AI agent. Chip makers like Micron and Sandisk also climbed, riding the AI wave. Meanwhile, big banks like JPMorgan, Wells Fargo, and Morgan Stanley each lost about 4% as rising borrowing costs hurt their profits.
Growth and technology stocks crushed the rest of the market on Tuesday. The Nasdaq reached an all-time high for the second straight day, driven by momentum in artificial intelligence and cloud computing shares. Meanwhile, traditional industrial stocks and value plays fell behind. This rotation shows investors are betting on future growth over steady dividends.
Banking stocks took the heaviest hit. JPMorgan, Wells Fargo, and Morgan Stanley each fell roughly 4% after Treasury yields jumped higher. Banks make money when rates rise, but only if their deposits stay cheap. Rising rates make borrowing more expensive for customers, slowing loan demand. This dynamic pressured these credit-sensitive giants.
Meta's new Muse AI agent lit a fire under the entire technology sector. The stock surged 13% over two consecutive trading sessions as investors cheered the announcement. Muse represents a major bet on generative AI—software that can write, design, and create content. Strong investor interest in AI tools continues to reshape stock valuations and trading patterns.
Other AI-related stocks rode the momentum higher. Micron and Sandisk, both chip makers that supply AI infrastructure, advanced sharply. Sandisk got an extra boost when Rosenblatt upgraded the stock. These gains reflect continued appetite for companies that power the artificial intelligence boom, not just AI software makers themselves.
President Trump's escalatory comments about Iran rattled markets and pushed Treasury yields sharply higher. Investors fled to safer bets and worried about geopolitical conflict that could disrupt oil supplies and global trade. Higher yields make borrowing more expensive across the entire economy. Banks and other debt-heavy industries felt the pain most directly.
The tensions undercut hopes for diplomatic talks with Iran. Instead of cooling relations, hard-line rhetoric raised fears of military escalation. This type of uncertainty typically benefits some sectors—like defense contractors and energy companies—but hurts others. Financial stocks, which benefit from stable, low-rate environments, bore the brunt of Tuesday's losses.
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