S&P 500 Rises 0.70% as Tech Leads Amid Mixed Breadth Signals

The S&P 500 rose 0.70% Monday, Oct. 26, as technology and semiconductor shares led gains. Advances outnumbered declines across major U.S. exchanges, while the index recorded as many 52-week lows as highs.

The index closed at 7,676.77, up 53.09 points, at 4 p.m. ET (20:00 UTC). Its technology sector gained 1.5%, and the Philadelphia Semiconductor Index rose 2.8%. Lumentum shares climbed about 8%, Coherent gained about 6% and Tesla rose 5.2%. Meta Platforms fell 1.9%.

Advancing stocks outnumbered decliners by 1.36-to-1 on the New York Stock Exchange and 1.09-to-1 on Nasdaq. Those ratios cover stocks traded across each exchange, not only S&P 500 constituents. Within the index, seven stocks reached new 52-week highs and seven reached new lows. The equal counts offer a more mixed signal than the exchange-wide ratios, which do not show how many S&P 500 stocks rose that day.

The S&P 500 is weighted by float-adjusted market capitalization, giving larger constituents more influence on its level. That structure helps explain why gains in major technology stocks can move the benchmark more than an equal-sized gain in a smaller company. Exchange-wide advance-decline ratios and the index’s 52-week high-low count measure different aspects of participation.

“Today's all about the Anthropic release, so we're back on a little bit of an optimistic tilt, I would say,” said JP Powers, chief investment officer at RWA Wealth Partners.

Anthropic, PBC filed a Form S-1 on Monday proposing a Nasdaq listing of Class A shares under the symbol ANT. The filing set no share count or price range, and the registration statement was not yet effective. For the six months ended June 30, 2026, the company reported $16.286 billion in revenue, compared with $1.163 billion a year earlier, and an $80.748 billion net loss. The filing listed $72.388 billion in fair-value changes tied to convertible notes, derivative liabilities and SAFEs; operating loss was $693 million.

Monday’s exchange-wide ratios measure participation in a single session. Our Oct. 23 breadth analysis also examined how widely market moves were shared among stocks.