Meta Platforms (META) shares traded in a volatile range during the week of September 14, 2026, closing September 18 at $665.75 after an intraday high near $690 and a 2.43% daily decline, following gains to $682.31 on September 17. The primary near-term driver remains the early-September launch of the Muse personal AI agent, which quickly topped the U.S. App Store and reinforced expectations for AI-driven revenue diversification beyond advertising. Q2 results showed 28% year-over-year revenue growth to $60.8 billion, though EPS missed estimates amid elevated infrastructure and AI-related costs. Insider sales by executives under Rule 10b5-1 plans added modest pressure, while consensus analyst targets near $757–$789 signal continued bullish positioning ahead of the October 28 earnings release.