Update: Anthropic's IPO Filing Boosts Tech Risk Sentiment, Lifts US Equity Indexes

03:55 PM EDT, 10/26/2026 (MT Newswires) -- (Updates with index/price moves from the first paragraph.) US equity indexes advanced as Anthropic's initial public offering filing lifted risk sentiment for big tech, especially chipmaker-related businesses. The Nasdaq Composite jumped 1% to 26,207.2, the S&P 500 advanced 0.8% to 7,681.5, and the Dow Jones Industrial Average climbed 0.2% to 52,334.7 ahead of Monday's close. All but three sectors rose, led by technology, consumer discretionary and financials. Communication services, healthcare, and consumer staples declined. Anthropic filed with the US Securities and Exchange Commission on Monday for an initial public offering of Class A common stock on the Nasdaq Global Select Market under the symbol "ANT." Anthropic could have a market capitalization of about $1.5 trillion, down from about $2 trillion that investors expected after the company disclosed some financial details earlier this month, Reuters reported. Goldman Sachs (GS) and Morgan Stanley (MS) are the lead underwriters, according to the filing. Fifteen of the 20 top-performing stocks in a category with a market capitalization exceeding $200 billion each were technology firms, according to Finviz-compiled data. A majority of the top outperformers were semiconductor-related firms, including chipmaker Arm (ARM), which was up 6.7%. The second-biggest gainer in this category was Tesla (TSLA), with shares surging 5.8% after the company said in a social media post on X that Latvia has authorized the electric vehicle manufacturer's full self-driving (supervised) system in the Eastern European nation. Goldman Sachs and Morgan Stanley were among the outperformers, up 2.3% and 2.7%, respectively. The front-month West Texas Intermediate crude oil contract slid 0.8% to $102.43 per barrel, and global benchmark Brent edged down 0.2% to $116.49 per barrel.