Anthropic's IPO filing boosts AI stocks, lifting S&P 500 and Nasdaq on Monday. US stocks closed higher, with the S&P 500 rising 0.7% to 7,676, the Nasdaq gaining 0.8% to 26,169, and the Dow increasing 0.3% to 52,361. The AI lab's filing, which disclosed steep losses and red-hot revenue growth, helped improve sentiment in AI-related stocks, particularly semiconductor and chip-related companies. This comes ahead of a busy week for markets, including the Federal Reserve's policy statement on Wednesday, US economic growth and inflation data on Thursday, and numerous corporate earnings reports from major tech companies like Alphabet, Microsoft, and Amazon.