Mitsui & Co., Ltd. (MITSY) Stock Price & How to Invest

Mitsui & Co., Ltd. (Mitsui Bussan) is a Tokyo-based general trading company that invests in and operates businesses across resources, energy, infrastructure, chemicals, food and healthcare. Trading is still part of the model, but most of the profit now comes from equity stakes: iron ore and coal mines in Australia, copper in Chile through Anglo American Sur, LNG and gas projects from Australia to Mozambique and Russia's Sakhalin II, power plants, auto dealerships and hospitals. In the fiscal year to March 2026 Mitsui reported revenue of ¥14.0 trillion and profit attributable to owners of ¥834.0 billion. The biggest contributors were Mineral & Metal Resources (¥253.6 billion), Machinery & Infrastructure (¥225.9 billion) and Energy (¥164.2 billion). From April 2026 the segments were reorganized: power generation moved into a renamed Mobility, Digital & Infrastructure segment and Lifestyle became Wellness Ecosystem.

The company traces its roots to the original Mitsui Bussan of 1876, which was dissolved after World War II; the present company was re-formed in 1947 and reunited under the Mitsui name in 1959. Its US depositary receipts date back to 1963, with Citibank as depositary. Kenichi Hori is President and CEO and Makoto Tanaka is CFO. Berkshire Hathaway is the best-known shareholder: Mitsui disclosed in September 2025 that Berkshire's National Indemnity had passed 10% of the voting rights, and Berkshire's February 2026 letter put the stake at about 10.4% at the end of 2025.

In the US, MITSY trades over the counter in dollars, and Mitsui's shareholder information page lists the ratio as one ADR to 20 common shares. The home listing is ticker 8031 on the Tokyo Stock Exchange, priced in yen. At ¥4,775 a share in early October 2026, 20 shares come to about $604 at ¥158 to the dollar, in line with the ~$608 ADR quote. Japan withholds tax on dividends paid to foreign holders, generally 15.315% for US residents under the tax treaty, so ADR dividends arrive net of that and of depositary fees.

The investment picture is a cash machine with commodity exposure. Core operating cash flow has been around ¥1 trillion for five straight years, ¥978.9 billion in fiscal 2026. The new medium-term plan (MTMP2029) targets profit of ¥1.1 trillion and return on equity of 12% by March 2029, and a 2030 vision of more than ¥1.4 trillion. For the current year Mitsui forecasts profit of ¥920 billion and a dividend of ¥140 per share, up ¥25, the largest increase in its history. The first quarter (April to June 2026) produced record profit of ¥294.1 billion, up 53%, and a new ¥200 billion buyback.

Mitsui's profit depends heavily on commodity prices it cannot control: iron ore, metallurgical coal, copper, crude oil and LNG together drive the Mineral & Metal Resources and Energy segments, which earned about half of fiscal 2026 profit, and iron ore and coal price declines alone cut segment profit by ¥31.8 billion last year. The yen matters too, since each one-yen move against the dollar shifts annual profit by about ¥4.6 billion; the June 2026 quarter got ¥17 billion of help from yen weakness that could reverse. Geopolitics is a direct exposure. The company is still exposed to Russia through Sakhalin II, whose valuation it marks on probability-weighted scenarios, and its plan assumed Middle East disruption, including transit restrictions in the Strait of Hormuz, would normalize by the September 2026 quarter. China's slowdown weighs on iron ore demand. Reported profit leans on one-off gains from asset sales and IPO revaluations, which were a large part of the record first quarter and may not repeat, and Mitsui has not yet raised its ¥920 billion full-year forecast. Net interest-bearing debt rose to ¥4.4 trillion in June 2026 (net debt-to-equity of 0.49x), partly from Rhodes Ridge, and a Penske Automotive buyout would add more. Operating cash flow was only ¥42.3 billion in the quarter because working capital absorbed ¥271.5 billion. For US holders, MITSY trades over the counter, where liquidity is thinner than in Tokyo, its dollar price moves with the yen, and dividends arrive net of Japanese withholding and depositary fees.

We give no verdict on Mitsui & Co., Ltd.. Both cases are real, which is why the question is contested at all, so here is the strongest version of each.

The case for buying. Iron ore and copper. Mineral & Metal Resources is Mitsui's largest profit pool, at ¥253.6 billion in fiscal 2026, built on Australian iron ore joint ventures, metallurgical coal, a Vale stake and copper in Chile.

The case against. Mitsui's profit depends heavily on commodity prices it cannot control: iron ore, metallurgical coal, copper, crude oil and LNG together drive the Mineral & Metal Resources and Energy segments, which earned about half of fiscal 2026 profit, and iron ore and coal price declines alone cut segment profit by ¥31.8 billion last year.

Read the full bull and bear case on MITSY, including what would have to change to break either one. Walnut is not an investment adviser.

A simple financial snapshot. These are approximations and refresh quarterly; for current figures see Mitsui & Co., Ltd.'s investor relations page or your broker.

• Revenue (TTM to June 2026): ~¥15.0T (~$95B)
• Profit to owners (TTM to June 2026): ~¥937B
• FY March 2027 profit forecast: ¥920B (EPS ~¥325)
• Market cap: ~¥13.5T (~$86B; share ¥4,775, ADR ~$608)
• Price / forecast earnings: ~14.7x
• Dividend (FY March 2027 plan): ¥140 per share (~¥2,800 per ADR), ~2.9% yield

At ¥4,775 Mitsui trades at about 14.7 times its own fiscal 2027 profit forecast of ¥920 billion, or roughly 14.5 times trailing profit of about ¥937 billion. Shareholders' equity was ¥9.0 trillion at the end of June 2026, so the shares sit at around 1.5 times book value, with return on equity of 10.2% in fiscal 2026 against a 12% target for March 2029. The forecast has not been raised despite a first quarter that delivered about 32% of it, and management said it would revise at an appropriate time while watching the Middle East. The ¥140 dividend implies a yield near 2.9%, and the ¥200 billion buyback adds roughly 1.5% of market value in repurchases through January 2027.

Other names that sit close to MITSY: same theme, named as a direct competitor, or held beside it in the same funds. Each entry says which. Worth a look if you are thinking about diversification within a thesis rather than concentration on one ticker.

There are three common ways to get MITSY exposure. Buy shares (or fractional shares) directly at any major broker. Hold an ETF that includes it, which spreads the position across many companies. Or build it into a focused thematic portfolio, so MITSY sits alongside other stocks that express the same thesis.

Walnut takes the portfolio route. Describe a thesis where MITSY fits (for example “AI infrastructure” or “dividend-growth large-caps”) and the AI proposes 5 to 6 constituents with target weights. You review the plan and fund it through your own broker when you're ready.

New to this? Start with how to invest in stocks, see how to analyze a stock with AI, or compare the best AI stock analyzers.

MITSY is a way to own a diversified, commodity-heavy Japanese conglomerate that is paying out more of its cash each year. Results swing with iron ore, copper, LNG and the yen, and the open question is whether a record first quarter, built partly on one-off gains, carries through 2026.

Whether MITSY is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, what would have to go right, and the risks in is MITSY a buy or a sell?, and where the stock could go from here in the MITSY stock forecast.

For income investors, whether MITSY pays a dividend and how the payout looks is covered in does MITSY pay a dividend? And to weigh MITSY against a peer, read the full side-by-side comparisons: MITSY vs MARUY and MITSY vs BRK-B.