US stocks closed at record highs on Tuesday as semiconductor and artificial intelligence companies lifted the major indexes, with investors continuing to favor AI-linked names ahead of third-quarter earnings even as elevated oil prices and Treasury yields weighed on much of the broader market.

The S&P 500, the widely followed benchmark of large US companies, rose 0.58% to close at 7,818.93, surpassing its previous peak from August. The Nasdaq gained 0.45% to finish at 27,599.79, while the Dow added 253 points to reach 51,521.

Chip Stocks Lead the Advance

Semiconductor firms drove most of the session's gains. Marvell rose 5.8%, and AMD gained 3%, while Broadcom and Nvidia also finished higher. Constellation Energy jumped 12% during the session, rounding out a day in which bets on AI spending fueled buying among the market's leaders. Together, these moves pushed the major indexes to new closing peaks.

The advance underscored investors' continued preference for artificial intelligence exposure heading into third-quarter reporting season, the stretch when publicly traded companies disclose their latest quarterly results. Still, high oil prices and elevated Treasury yields kept gains narrow across the rest of the market, leaving the day's rally dependent on a handful of large companies.

In a post on X, market commentator Big George reported that Wall Street closed at fresh records on Tuesday. According to the post, the Russell 2000 fell 0.6% even as large-cap stocks advanced, and it also pointed to Nvidia's weight in the benchmark.

WALL STREET JUST HIT FRESH RECORDS BUT THERE'S A CATCH

U.S. stocks closed at record highs Tuesday.

• S&P 500: +0.58% → 7,818.93
• Nasdaq: +0.45% → 27,599.79
• Dow: +253 pts → 51,521
• Russell 2000: −0.6%

The rally is being powered by one thing… pic.twitter.com/dH4Ies2gOf

— Big George (@BigGeorgeXL) October 7, 2026

Nvidia is now approaching a market capitalization of $6 trillion — the combined value of its outstanding shares. Because the S&P 500 weights companies by market value, Nvidia alone accounts for more than 8% of the index, a weighting that means the stock's moves feed directly into the index's performance.

Investors are betting on strong spending on AI infrastructure, and analysts expect third-quarter earnings growth of roughly 30% for the S&P 500. Consequently, the bull case for US stocks rests on AI spending feeding into stronger earnings, which would in turn support higher share prices.

Narrow Breadth and Rate Pressure

Tuesday's gains remained concentrated in a small group of companies. Small-cap stocks fell, leaving the Russell 2000, an index that tracks smaller US companies, behind the large-cap indexes, while technology shares carried the market. The equal-weight version of the S&P 500, which gives each company the same influence regardless of its size, stayed almost 5% below its August peak — a gap that highlights how much the benchmark's record depends on its largest constituents.

Oil prices also remained elevated, with Brent crude, the international oil benchmark, trading near $100 a barrel. The 10-year Treasury yield, the benchmark rate on US government debt, stood at roughly 5.3%, meaning borrowing costs remain high. Those conditions pressured healthcare and bank shares, both of which declined on the day.

The narrow breadth was described as a warning sign. Big George stated that too much of the market depends on too few companies, and the post asked whether the rally marks an AI-led melt-up or a loss of breadth.

Looking ahead, investors will watch the upcoming Federal Reserve minutes, which offer a record of the central bank's latest policy discussions, and the next round of earnings reports. Both will test whether AI momentum can sustain the rally, and both arrive with the S&P 500 sitting at a record close.

Until then, US stocks remain driven mainly by a handful of technology names, with oil prices and Treasury yields still part of the backdrop.

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