Meta Platforms shares surged 11.4% on September 21 after the company’s new personal AI agent, Muse, reached the top position on Apple’s U.S. App Store. The rally added approximately $192.3 billion to Meta’s market capitalization and gave investors a fresh reason to assess the company’s massive artificial intelligence spending through the performance of a consumer product.
Meta’s stock recorded its biggest one-day percentage gain since April 2025, according to market data reported by the Financial Times and MarketWatch. The move also extended Meta’s gains for September to roughly 35%, making the company’s AI strategy an increasingly important factor in the stock’s recent performance.
Muse Gives Meta’s AI Spending a Consumer Test
Muse reached No. 1 on Apple’s U.S. free iPhone chart on September 18, according to Sensor Tower data reported by Yahoo Finance. The application had accumulated more than 730,000 U.S. downloads over its first 10 days, putting it ahead of ChatGPT, Gemini, Claude and Instagram on the App Store’s ranking.
The result is significant because Muse is designed to do more than answer questions. Meta launched it as a personal AI agent capable of carrying out tasks such as sending emails, booking travel, completing online forms and making purchases on a user’s behalf. The company says Muse can continue working on longer tasks after a user closes the application.
Meta’s product is built around a dedicated cloud environment called Muse Secure VM. The company says this provides an isolated computer where the agent and a user’s data can operate, while a separate security system controls internet access and asks for approval before sensitive actions.
Related: Mark Zuckerberg Launches Muse as Meta Pushes Into Personal AI Agents
The commercial model also gives investors a potential path toward monetizing the company’s AI investment. Muse is free for most uses, while Meta offers paid subscription tiers for users who need greater access. Meta has also introduced enterprise access to its AI models, creating potential revenue streams beyond the company’s traditional advertising business.
Wall Street has started putting numbers around that possibility. Truist analysts estimated that Muse could generate $28.5 billion in incremental revenue by 2030 under their base-case scenario, describing the product as an attempt to build a non-advertising revenue stream that could demonstrate returns on Meta’s large capital expenditures. That is an analyst estimate, not Meta guidance.
Meta’s AI Bet Faces a Bigger Test
The App Store ranking nevertheless provides only an early measure of consumer interest. Download rankings do not show how frequently users return, how many convert to paid subscriptions or how much revenue Muse ultimately generates.
Meta is also moving to expand Muse’s commercial capabilities. Shopify said it plans to allow Muse to complete purchases across participating merchants using Shop Pay, potentially giving the AI agent a direct role in online commerce.
That development could be important for Meta’s long-term AI strategy because an agent that completes transactions has more potential economic value than a chatbot that only generates information. If users begin delegating shopping, travel and administrative tasks to Muse, Meta could gain new opportunities around transactions and services.
The company is simultaneously spending heavily to build the computing infrastructure required for its AI ambitions. That spending has been a major concern for investors because the financial return from AI infrastructure can take years to become visible. Muse’s early consumer traction offers one data point that could help address that concern, although it does not yet establish a return on investment.
Trust and security remain another challenge. Meta’s Muse requires access to personal information and, with user permission, connected services that can allow the agent to perform actions. The Wall Street Journal has highlighted the trust issue as a central challenge for the product because users must be comfortable giving an AI agent authority over increasingly sensitive tasks.
For META shareholders, the latest rally therefore reflects more than an App Store ranking. Investors are beginning to see whether Meta can turn its enormous AI infrastructure investment into products that consumers actually use and eventually pay for. Muse’s No. 1 position provides an encouraging early signal of demand, but sustained usage, subscription revenue and successful agentic commerce will be more important measures of the strategy’s long-term economics.
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