Meta's stock closed September at $725.18, a 27% increase from the end of August. That marked the company's best monthly gain since 2022, according to CNBC.

The rally followed the Sept. 8 debut of Muse, Meta's personal AI agent app. The app quickly became a hit, surpassing OpenAI's ChatGPT in Apple iOS downloads.

Wall Street has responded positively to Meta's recent AI momentum. The share price climb reflects growing optimism about the company's strategy as it pushes further into consumer AI products.