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Meta Platforms was one of the few bright spots in an otherwise weak U.S. equity session on Wednesday, September 9, 2026, with its shares rising after the company launched Muse, a new AI assistant. The gain stood out on a day when higher oil prices and rising Treasury yields pushed the broad indexes lower and left technology as one of the only sectors showing pockets of strength. The market reaction underscored how investors continued to reward large-cap technology companies that demonstrated concrete progress in consumer-facing artificial intelligence products, even in a risk-averse tape. For Meta, the launch represented a further push to convert heavy AI infrastructure spending into user-facing services. The move was significant for index performance as well, given the outsized weight mega-cap technology names carry in the S&P 500 and Nasdaq, helping cushion the day's declines.