Mercari shares jump 7.33% after Meta announces planned integration for Muse assistant
Key Facts
Mercari shares rose 7.33% in Tokyo and closed at 3,704 yen on October 23 after Meta said its personal assistant Muse would move toward integration with the Japanese commerce platform. A market report said the announcement of the assistant’s launch and the planned connection were among the session’s buying catalysts. The move came after the stock ended trading on October 22 at 3,451 yen, down 2.18%. Trading volume in the October 23 session was 3.52 million shares. The gain reflects investors’ response to the possibility of using the assistant in the shopping experience, while the announcement described the integration as under development.
Meta has not disclosed technical details explaining how Muse will connect with Mercari’s services, or the scope of functions the integration will offer. The company also did not set a launch date, saying only that it is under development. Assessing the announcement’s impact therefore depends on details the two companies provide later about how the assistant will be used in the shopping experience. The announcement has made Mercari part of Meta’s effort to connect its assistant with local services used by consumers in Japan. The market’s initial response remains tied to anticipated capabilities that have not yet become a service with publicly disclosed details.
Muse recorded rapid adoption indicators after its launch: Reuters said it achieved 2.8 million downloads in its first two weeks. The agency added that average daily download growth reached 55% during the first ten days. These figures provide context for investors’ interest in the assistant’s potential, since its user base could give it access to a broad audience when connected to shopping services. But the download figures relate to the app and do not in themselves measure use of the Mercari integration, which has not yet launched. The impact of the connection on the Japanese company will become clearer when implementation details are announced and the service is available to users.
Reuters said investors saw Muse as a potential tool for making it easier to compare prices and find lower-cost alternatives, which could weaken customer loyalty to existing service providers. That view could give commerce platforms an opportunity to attract consumers through the assistant while also intensifying competition over purchasing decisions. For Mercari, this remains a possibility tied to how the integration is designed and used, rather than a confirmed outcome of the announcement. Meta has not said whether Muse will compare Mercari products with alternatives outside the platform or how it will present purchasing options. Attention will therefore focus on the nature of the shopping experience the integration provides when it is complete.
The announcement comes as Meta faces investor scrutiny over the cost of its expansion in artificial intelligence. Reuters said the stock fell more than 7% on October 22 amid concern about higher annual spending expectations and a plan to issue new shares to fund it. The company had raised the lower end of its 2026 capital expenditure forecast by $5 billion, to a range of $135 billion to $145 billion. These figures reflect the cost side of its strategy to launch AI products and expand infrastructure, as the company seeks to build services that attract users. Meta shares closed at $648.85 on October 22, according to EL7 data. Muse’s expansion is thus unfolding alongside market questions about whether AI products can attract users and justify the required investment.
In Japan, the services activity index rose to 52.0 in October from 51.3 in September, according to a flash estimate from S&P Global. This provides context on activity in the country’s services sector during the month, but does not in itself explain the move in Mercari shares or directly relate to Meta’s announcement. The closest focus remains the announcement of an integration launch date and the functions it will offer users. The partnership’s significance will also become clearer once it is known whether the assistant will play a role in Mercari’s shopping experience and how it will present product options. Until then, the announcement signals planned cooperation rather than a description of a completed service.