US Markets Today: S&P, Nasdaq end higher as Anthropic IPO filing revives AI optimism; Tesla hits 3 month high

The S&P 500 and Nasdaq 100 closed higher in the latest US session, with the rally attributed to renewed enthusiasm for artificial intelligence after a filing related to an Anthropic initial public offering. Tesla shares reached a three-month high in the same session, according to the headline. The transmission channel here is risk appetite and sector sentiment rather than rates or macro data: a credible listing of a leading private AI developer tends to re-rate public peers with AI exposure and lifts the valuation premium investors assign to growth-oriented index constituents. Nasdaq 100 names carrying concentrated AI-linked earnings expectations are the most directly exposed, while Tesla's move suggests investors are also pricing its autonomy and AI narrative alongside its vehicle fundamentals. Traders should watch the trading and pricing details of the Anthropic offering once terms are set, as a strong debut would reinforce the AI rerating, while any weakness would test how durable the current sentiment-driven gains are.

The Nasdaq-100 (NDX) is the US large-cap tech benchmark. NDX is more sensitive to rate decisions than SPX because of longer-duration cash flows, and heavily concentrated in Tech/Comms names — mega-cap earnings season dominates price action.

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