---
title: "Rakuten Bank Surges 10.4% As Mizuho Weighs Investment"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286770908.md"
description: "Rakuten Bank's shares surged 10.4% in Tokyo after Mizuho Financial Group announced it is considering an investment in the online lender as part of Rakuten Group's financial overhaul. Mizuho's potential involvement could enhance the value of Rakuten's financial ecosystem, which includes significant stakes in Rakuten Card and Rakuten Securities. Rakuten Bank, with total assets of 16.6 trillion, has seen its customer accounts rise to 18 million, reflecting a growing financial presence."
datetime: "2026-05-18T12:26:34.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286770908.md)
  - [en](https://longbridge.com/en/news/286770908.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286770908.md)
---

# Rakuten Bank Surges 10.4% As Mizuho Weighs Investment

Rakuten Bank jumped in Tokyo after Mizuho Financial Group said it is weighing an investment in the online lender as one possible piece of Rakuten Group's planned financial-business overhaul. The reaction was immediate. Rakuten Bank rose as much as 10.4% on Monday, marking its biggest gain in three months, while Rakuten Group slipped 0.7% after earlier climbing as much as 4.6%. Mizuho shares also came under pressure, falling as much as 7.7%, partly weighed down by a disappointing fourth-quarter buyback size.

Mizuho said in a stock exchange filing that it is studying multiple options, while Rakuten Group separately said no decision has been made. The potential move would deepen an already important relationship between the companies. Mizuho Bank owns 14.99% of Rakuten Card, and Mizuho Securities holds 49% of Rakuten Securities. Rakuten Group began discussions in February to bring its bank, card and brokerage operations under a single group, a restructuring expected to take place in October.

For investors, the possible Mizuho involvement could sharpen the focus on the value sitting inside Rakuten's financial ecosystem. Rakuten Bank, founded in 2000, has 16.6 trillion in total assets, roughly in line with large regional banks that have operated for decades longer. Its market capitalization stands at about 1.15 trillion, placing it among a limited group of Japanese banks above the 1 trillion mark. The bigger story is Rakuten's economic zone, where reward points help keep customers moving across its businesses. Rakuten Bank accounts reached about 18 million at the end of March, up 7.3% from a year earlier.

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