Mizuho Financial Group

Investing in Rakuten Securities: face-to-face meets online (2022)

Key decision·2022· Mizuho Financial Group — the full company history →

Partnering halfway, without taking control

The heart of this decision was that a megabank’s securities arm, whose strength had lain in face-to-face sales, used capital to step inside the online broker it competed with head-on. For a Mizuho that had damaged retail trust in the 2021 system failures, riding on Rakuten Securities’ finished customer base for $609M (¥80bn) was faster than fencing in a young, wealth-building generation from scratch. A Rakuten that wanted cash to cover losses in its mobile business, and a Mizuho that wanted to make up for its weakness online — this investment stands where the two sides’ needs meshed.

Even so, Mizuho stopped at 49% rather than taking a majority. Making it a subsidiary would have weighed it down with the heavier regulation of a bank affiliate and could have damaged the Rakuten name and its freedom to run itself. In choosing not control but a partnership in which two firms stand side by side, the design behind this investment shows through. As personal asset management shifts online and the new NISA swells the flow of individual money, whether this attempt — a face-to-face bank and an online broker clasping hands halfway — bears fruit will be confirmed, from here on, in the numbers.

Revenue and net margin, FY2017–FY2026

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY2022 onwards — after it was taken.

Source: securities reports

Read the full dossier in Japanese →

The Japanese edition carries the complete record of this decision — the situation that forced it, the options weighed, what actually followed, and the sources behind every claim.

Other key decisions at Mizuho Financial Group


Yen amounts are converted at the average rate of each figure’s own year — not today’s rate; the revenue chart is shown in yen. Exchange rates & sources — the full ¥/US$ table →


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  • Sources are primarily each company’s securities reports and other public filings, but errors and omissions may remain.
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Data API

Mizuho Financial Group’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/8411/manifest.json Resource index
GET /api/8411/history.json History overview
GET /api/8411/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/8411/decisions.json Management decisions (index)
GET /api/8411/decisions/{slug}.json One decision (full dossier)
GET /api/8411/executives.json Executives
GET /api/8411/shareholders.json Major shareholders
GET /api/8411/financials.json Financial statements
GET /api/8411/financials-longterm.json Long-term results
GET /api/8411/segments.json Business segments
GET /api/8411/regions.json Sales by region
GET /api/8411/workforce.json Workforce