The catalyst: Meta Muse AI agent announcement.

Stocks advanced Monday as oil prices eased and investors turned their attention to this week’s United National General Assembly for potential signs of resolution to the conflict in Iran. Technology stocks, and artificial-intelligence stocks in particular, traded higher after Treasury Secretary Scott Bessent met with China’s vice premier He Lifeng and said the pair had agreed to an AI dialogue. M

As reported: “AMD, Intel, Meta, Warner Bros., Moderna, Grail, Strategy, and More Stocks That Explain Today’s Market” — Yahoo Finance, 2026-09-21.