S&P 500, Nasdaq, Dow Begin Week Higher As Anthropic IPO Filing Rekindles AI Enthusiasm — MSFT, AAPL, CART, VZ In Focus

US equity indexes opened the week higher, with the S&P 500, Nasdaq, and Dow all rising, after a reported Anthropic IPO filing revived enthusiasm for artificial intelligence stocks. The transmission channel is risk appetite and sentiment repricing: a prospective public listing of a leading AI developer raises expectations for the sector's long-term revenue pool and valuation support, pushing capital toward AI-linked equities. Megacap technology names with heavy AI exposure, including Microsoft and Apple within the headline's focus list, and the Nasdaq-100 more broadly, are most sensitive to this shift because their multiples are highly responsive to changes in growth expectations. Traders should watch whether follow-through buying holds as the session progresses, along with any formal details in the filing on valuation, offering size, and timing, which would indicate how much of the enthusiasm is durable.

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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