If you are trying to figure out what to do with Mizuho Financial Group right now, you are not alone. The stock has been grabbing attention with its impressive run, jumping 5.0% over the past week, 5.5% in the past month, and an incredible 83.6% over the last year. Stretch that to five years, and we are looking at a staggering gain of 371.3%. Clearly, something has shifted in the market’s perception of risk or growth for this Japanese financial powerhouse.

Some of this excitement is being fueled by global banking optimism and Japan’s evolving monetary policy, both of which have brought renewed interest to the sector. Investors are now actively revisiting companies like Mizuho, seeking stability and the potential for further gains amid shifting sentiment.

But strong price performance alone does not necessarily mean the stock is still a good buy. That is why we turn to valuation scores. Mizuho currently scores a 4 out of 6, suggesting it is undervalued in four of the six main checks that matter to value-focused investors. Does this mean the rally still has room to run, or does it signal a time for caution?

Let us break down how that valuation score was reached and explore what the numbers say about Mizuho’s true value. At the end, I will reveal an even smarter way to think about whether this stock still belongs in your portfolio.

Mizuho Financial Group delivered 83.6% returns over the last year. See how this stacks up to the rest of the Banks industry.

The Excess Returns valuation model examines how effectively a company creates value over and above its cost of equity, focusing on long-term profitability rather than just near-term earnings. It evaluates whether the firm earns more from its invested capital than it spends on equity financing and provides investors insight into true economic profit.

In Mizuho’s case, the model highlights a solid foundation:

Book Value: ¥4,217.53 per share

Stable EPS: ¥498.62 per share (source: weighted future Return on Equity estimates from 9 analysts)

Cost of Equity: ¥311.14 per share

Excess Return: ¥187.48 per share

Average Return on Equity: 10.28%

Stable Book Value: ¥4,851.67 per share (source: weighted future Book Value estimates from 9 analysts)

Considering these factors, the model sets Mizuho’s intrinsic value at ¥8,033 per share. With the stock currently trading at a 36.7% discount to this estimate, the analysis suggests Mizuho is undervalued based on its ability to generate returns above its cost of capital.

Result: UNDERVALUED

Head to the Valuation section of our Company Report for more details on how we arrive at this Fair Value for Mizuho Financial Group.

Our Excess Returns analysis suggests Mizuho Financial Group is undervalued by 36.7%. Track this in your watchlist or portfolio, or discover more undervalued stocks.

For profitable companies like Mizuho Financial Group, the Price-to-Earnings (PE) ratio is a useful way to understand how the market values their ongoing earnings power. The PE ratio essentially tells us how much investors are willing to pay for each yen of earnings. A higher number can reflect optimism about future growth, while a lower figure may signal increased risk or slower growth prospects.

Right now, Mizuho trades at a PE ratio of 14.26x. To put that in context, the average PE for banks in its industry is 11.52x, while similar peers post a notably higher 20.46x. This means Mizuho sits above the sector average but below its closest competitors. Growth expectations, profit stability, and risk factors all influence what that “normal” or “fair” PE should be for a business like Mizuho’s.

Simply Wall St’s “Fair Ratio” for Mizuho is 15.92x. This metric is more insightful than just looking at industry or peer averages, because it considers a wider set of factors unique to the company: earnings growth, risk levels, profit margins, industry pressures, and market cap. By using this multi-layered lens, you get a more balanced and forward-looking view of valuation.

Since Mizuho’s actual PE ratio (14.26x) is slightly below its Fair Ratio (15.92x), the stock appears to be undervalued according to this metric.

Result: UNDERVALUED

PE ratios tell one story, but what if the real opportunity lies elsewhere? Discover companies where insiders are betting big on explosive growth.

Earlier we mentioned that there is an even better way to understand valuation, so let us introduce you to Narratives. A Narrative is simply your story about where a company is headed and why, built on your own expectations for future revenue, earnings, and profit margins rather than just recent numbers or averages. Narratives allow you to link your view of Mizuho Financial Group’s prospects with a specific financial forecast, translating your beliefs about the company’s future into a fair value for the stock.

Using Narratives is easy and accessible on Simply Wall St’s Community page, where millions of investors create and compare their perspectives. With Narratives, you can track whether you would buy, sell, or hold by seeing how your Fair Value compares to today’s share price. In addition, Narratives update automatically as new news or results come in, so your view stays relevant.

For a company like Mizuho, Narratives might reflect very different viewpoints: one investor believes bold acquisitions and cost control will power earnings to ¥1,343.7 billion and justify a price above ¥6,000 per share, while another fears rising costs or integration risks could limit growth with fair value closer to ¥3,800. Narratives help you see both stories and decide what makes sense for you.

Do you think there's more to the story for Mizuho Financial Group? Create your own Narrative to let the Community know!

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

Companies discussed in this article include 8411.

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