The MoatNarrow moat

Mitsui & Co. (8031) — moat facet

Mitsui owns sixty years' worth of stakes in iron ore and LNG that no one can assemble again, and none of them sets a price.

Mitsui's advantage is a portfolio that took sixty years to assemble and cannot be bought again at the price it was bought. It joined Robe River in 1965, signed for Mount Newman ore in 1966, agreed to develop LNG at Das Island in Abu Dhabi in 1971 and joined Sakhalin II in 19941. Those positions now give it 63.8 million tonnes of equity iron ore a year2 and 8 million tonnes of equity LNG capacity3, and its iron ore business alone earned about ¥260 billion in the latest year4.

Net profit (¥ bn, years to March)-83.42016418.52018391.52020914.720221,130.620231,063.72024834.02026Loss shown as magnitude; Mitsui results, years to March 2016-2026
From a loss to more than a trillion yen and back to ¥834 billion.

The portfolio is not only resources. Its Machinery & Infrastructure segment earned ¥225.9 billion from stakes such as Penske Automotive, Penske Truck Leasing and Brazilian gas distribution5, and its Lifestyle segment holds 32.7% of IHH Healthcare, a hospital group of about 90 hospitals in 10 countries67. Resources, meaning Mineral & Metal Resources and Energy, produced 50.1% of profit in the latest year, down from 58.0% two years earlier8.

The moat is narrow rather than wide because none of this gives Mitsui pricing power. It is a minority partner in mines and gas projects run by Rio Tinto, BHP, Vale and others, selling commodities whose prices are set in world markets. Its return on equity has been above 10% in each of the last five years, falling from 18.9% to 10.2%9, and its only net loss in the period, ¥83.4 billion in the year to March 2016, came from copper and iron ore write-downs10.

What it does control is capital allocation. It holds investments to a 10% IRR minimum11, sold ¥1,481 billion of assets over its last plan12, and returns over half its core operating cash flow to shareholders13. Those are the habits that attracted Berkshire Hathaway, now its largest shareholder at 10.12%14.

The contrast with the trading business is what makes the portfolio worth studying. Revenue of ¥13,995.2 billion produced gross profit of ¥1,328.2 billion15, a margin under 10%, while the stakes produced most of the profit. Mitsui's own summary of the portfolio is 1,080 projects with a book value of ¥10.2 trillion16.

The company's assets have been built over decades and are now being extended at the price of the present. Rhodes Ridge cost $5,342 million for 40% of an undeveloped deposit17, a reminder of what the 1965 Robe River stake would cost to assemble now. That is the strongest argument for the moat and, through the falling return on equity, the clearest sign of its cost.

The measure is ROE against the plan's 12%. At 10.2% it is below the target and has fallen three years running18; a recovery above 12% by the year to March 2029 would show the discipline outlasting the commodity cycle.

Moat trajectory: Holding steady

The portfolio is being extended with Rhodes Ridge and Mozambique; returns on equity are falling while it is built.

The number that tests this moat
Reported
Return on equity against the plan target
10.2% against a 12% target

The single test of whether Mitsui's portfolio earns its keep through the cycle.

Source: Mitsui & Co. Integrated Report 2026, data ↗
Aspects of the moat
DIG DEEPER 01
Sixty-Four Million Tonnes of Pilbara Iron Ore
Mitsui's biggest profit comes from iron ore mines it has owned a piece of since 1965 and does not run.
DIG DEEPER 02
LNG: Eight Million Tonnes, Going to Fifteen
Mitsui's LNG positions are old, contracted and hard to copy, and they earn less on their assets than its iron ore.
DIG DEEPER 03
Penske, Trucks and the Businesses Others Run
Mitsui's steadiest profit comes from American trucks and cars and Brazilian gas pipes, run by partners.
DIG DEEPER 04
An Investor's Discipline
Mitsui runs itself like an investment portfolio with a 10% hurdle, and its return on equity has fallen three years running.
References
  1. ReportedIt joined Robe River in 1965, signed for Mount Newman ore in 1966, agreed to develop LNG at Das Island in Abu Dhabi in 1971 and joined Sakhalin II in 1994.
    Mitsui & Co., Annual Securities Report for the year to March 2026 (English) - company history, employees, share price history, total shareholder return, equity production, the revenue of the Singapore trading subsidiary, competition and the Arctic LNG 2 guarantees. — FY to March 2026 · publ. 12 August 2026 · source ↗
  2. ReportedThose positions now give it 63.8 million tonnes of equity iron ore a year and 8 million tonnes of equity LNG capacity, and its iron ore business alone earned about ¥260 billion in the latest year.
    Mitsui & Co., Annual Securities Report for the year to March 2026 (English) - company history, employees, share price history, total shareholder return, equity production, the revenue of the Singapore trading subsidiary, competition and the Arctic LNG 2 guarantees. — FY to March 2026 · publ. 12 August 2026 · source ↗
  3. ReportedThose positions now give it 63.8 million tonnes of equity iron ore a year and 8 million tonnes of equity LNG capacity, and its iron ore business alone earned about ¥260 billion in the latest year.
    Mitsui & Co. Integrated Report 2026, Our Edge - profit of the iron ore, LNG, mobility and protein and healthcare businesses, the iron ore and LNG growth paths, IHH's hospitals and market positions. — 2026 · publ. 2026 · source ↗
  4. ReportedThose positions now give it 63.8 million tonnes of equity iron ore a year and 8 million tonnes of equity LNG capacity, and its iron ore business alone earned about ¥260 billion in the latest year.
    Mitsui & Co. Integrated Report 2026, Our Edge - profit of the iron ore, LNG, mobility and protein and healthcare businesses, the iron ore and LNG growth paths, IHH's hospitals and market positions. — 2026 · publ. 2026 · source ↗
  5. ReportedIts Machinery & Infrastructure segment earned ¥225.9 billion from stakes such as Penske Automotive, Penske Truck Leasing and Brazilian gas distribution, and its Lifestyle segment holds 32.7% of IHH Healthcare, a hospital group of about 90 hospitals in 10 countries.
    Mitsui & Co. Integrated Report 2026, data section - the major affiliates by segment with ownership and share of profit. — FY to March 2022-2026 · publ. 2026 · source ↗
  6. ReportedIts Machinery & Infrastructure segment earned ¥225.9 billion from stakes such as Penske Automotive, Penske Truck Leasing and Brazilian gas distribution, and its Lifestyle segment holds 32.7% of IHH Healthcare, a hospital group of about 90 hospitals in 10 countries.
    Mitsui & Co. Integrated Report 2026, data section - the major affiliates by segment with ownership and share of profit. — FY to March 2022-2026 · publ. 2026 · source ↗
  7. ReportedIts Machinery & Infrastructure segment earned ¥225.9 billion from stakes such as Penske Automotive, Penske Truck Leasing and Brazilian gas distribution, and its Lifestyle segment holds 32.7% of IHH Healthcare, a hospital group of about 90 hospitals in 10 countries.
    Mitsui & Co. Integrated Report 2026, Our Edge - profit of the iron ore, LNG, mobility and protein and healthcare businesses, the iron ore and LNG growth paths, IHH's hospitals and market positions. — 2026 · publ. 2026 · source ↗
  8. Moat Explorer calcResources, meaning Mineral & Metal Resources and Energy, produced 50.1% of profit in the latest year, down from 58.0% two years earlier.
    Moat Explorer calculation from Mitsui & Co.'s reported figures. Resource share of profit: (253.6 + 164.2) / 834.0 = 50.1% (2026), 51.0% (2025), 58.0% (2024). Iron ore business share: 262.2 / 834.0 = 31.4%. Trailing twelve months to June 2026: net income 833,971 - 191,647 + 294,052 = 936,376; revenue 13,995.2 - 3,299.9 + 4,347.6 = 15,042.9; EPS 291.12 - 66.68 + 103.73 = 328.17. P/S at March year-ends: 5,340.8 / 11,757.6 = 0.45 (2022), 0.44 (2023), 0.80 (2024), 0.55 (2025), 16,969.0 / 13,995.2 = 1.21 (2026). Share price change since March: 5,033 / 5,959 - 1 = -15.5%. Shares issued, split-adjusted: 3,284.7 million (March 2022) to 2,864.7 million (March 2026) = -12.8%. Equity-method profit and dividend income: 447.4 + 178.7 = 626.1, 57.6% of profit before tax of 1,087.1. Segment profit over segment assets, year to March 2026: Mineral & Metal Resources 253.6 / 4,313.2 = 5.9%; Machinery & Infrastructure 225.9 / 4,427.3 = 5.1%; Energy 164.2 / 4,181.4 = 3.9%; Chemicals 67.5 / 2,241.8 = 3.0%; Lifestyle 52.0 / 3,091.1 = 1.7%; Innovation & Corporate Development 59.0 / 2,655.3 = 2.2%; Iron & Steel Products 18.9 / 862.4 = 2.2%. Innovation & Corporate Development including other and adjustments: 59.0 + 20.7 - 27.7 = 51.9 (2026), 87.3 - 42.8 + 21.5 = 65.9 (2025), 53.8 + 5.6 - 5.9 = 53.6 (2024). A $10 move in iron ore: 10 x ¥3.0 billion = ¥30 billion, 3.3% of the ¥920 billion forecast. Berkshire's market value over cost: 8,785 / 3,490 = 2.52 times; dividend on cost 201 / 3,490 = 5.8%. Progress against guidance: 294.1 / 920.0 = 32.0%. Profit growth since the year to March 2016's loss: from -83.4 to 834.0. Resource profits: 335.1 + 281.7 = 616.8 (2024) and 253.6 + 164.2 = 417.8 (2026). Three largest segments: (253.6 + 225.9 + 164.2) / 841.1 = 76.5%. Energy Trading Singapore: 1,986,458 / 13,995,222 = 14.2%. First-quarter one-time gains: (44.2 + 10.2) / 294.1 = 18.5%. Innovation & Corporate Development first quarter against plan: 65.2 / 70.0 = 93%. Arctic LNG 2 provision change: 66,109 - 57,759 = 8,350. A $1 move in US gas: 10 x ¥1.2 billion = ¥12 billion. Vale dividend: 35.0 / 59.6 - 1 = -41%; 43.5 / 35.0 - 1 = +24%. Truck leasing holding: 19.8 / 28.4 - 1 = -30%; 18.8 / 19.8 - 1 = -5%. Profit to the 2029 target: 1,100 / 834.0 = 1.32; to the 2031 vision: 1,400 / 834.0 = 1.68. Berkshire value over cost 2.52 and dividend yield on cost 5.8%. Ministers North at full production: 7% x 20 Mt = 1.4 Mt. Mainstream charges: 15.1 + 15.9 + 28.05 = 59.05. Vale dividend fall against segment profit: (59.6 - 35.0) / 285.4 = 8.6%. Mitsui against smaller houses: profit 936.4 / 619.1 = 1.51 and 936.4 / 575.9 = 1.63; value 14.63 / 8.51 = 1.72 and 14.63 / 8.09 = 1.81. Trailing P/E: 14.63 trillion / 936.4 billion = 15.6; P/S 14.63 / 15.043 = 0.97. Dividend growth: 115 / 27.5 = 4.2 times. — FY to March 2026 · publ. September 2026 · source ↗
    Method: Arithmetic on figures reported in Mitsui & Co.'s results, integrated report, securities report and market data; operands shown in the source line.
  9. ReportedIts return on equity has been above 10% in each of the last five years, falling from 18.9% to 10.2%, and its only net loss in the period, ¥83.4 billion in the year to March 2016, came from copper and iron ore write-downs.
    Mitsui & Co. Integrated Report 2026, data section - the five-year financial data: market capitalisation, PER, PBR, ROE, net debt, free cash flow, asset recycling and payout. — FY to March 2022-2026 · publ. 2026 · source ↗
  10. ReportedIts return on equity has been above 10% in each of the last five years, falling from 18.9% to 10.2%, and its only net loss in the period, ¥83.4 billion in the year to March 2016, came from copper and iron ore write-downs.
    Mitsui & Co., Consolidated Financial Results for the year ended March 31, 2016 - the net loss and the impairments in Chilean copper, Valepar, Browse LNG and power. — FY to March 2016 · publ. May 2016 · source ↗
  11. ReportedIt holds investments to a 10% IRR minimum, sold ¥1,481 billion of assets over its last plan, and returns over half its core operating cash flow to shareholders.
    Mitsui & Co. Integrated Report 2026, financial and portfolio strategy - the 10% IRR minimum and the review of 1,080 projects. — 2026 · publ. 2026 · source ↗
  12. ReportedIt holds investments to a 10% IRR minimum, sold ¥1,481 billion of assets over its last plan, and returns over half its core operating cash flow to shareholders.
    Mitsui & Co., Medium-term Management Plan 2029 presentation - targets, the 2030 vision and the scorecard of MTMP2026. — FY to March 2027-2029 · publ. 1 May 2026 · source ↗
  13. ReportedIt holds investments to a 10% IRR minimum, sold ¥1,481 billion of assets over its last plan, and returns over half its core operating cash flow to shareholders.
    Mitsui & Co., Consolidated Financial Results for the three months ended June 30, 2026 (IFRS) - revenue, profit, segment results on the new basis, core operating cash flow and the balance sheet. — April-June 2026 · publ. 4 August 2026 · source ↗
  14. ReportedThose are the habits that attracted Berkshire Hathaway, now its largest shareholder at 10.12%.
    Mitsui & Co. release, 9 October 2025 - National Indemnity holds 292,044,900 shares, 10.12%, and has become the largest shareholder. — October 2025 · publ. 9 October 2025 · source ↗
  15. ReportedRevenue of ¥13,995.2 billion produced gross profit of ¥1,328.2 billion, a margin under 10%, while the stakes produced most of the profit.
    Mitsui & Co., Consolidated Financial Results for the year ended March 31, 2026 (IFRS) - the consolidated statements of income, financial position and cash flows, segment information, dividends, buybacks and the forecast for the year to March 2027. — FY to March 2026 · publ. 1 May 2026 · source ↗
  16. ReportedMitsui's own summary of the portfolio is 1,080 projects with a book value of ¥10.2 trillion.
    Mitsui & Co. Integrated Report 2026, financial and portfolio strategy - the 10% IRR minimum and the review of 1,080 projects. — 2026 · publ. 2026 · source ↗
  17. ReportedRhodes Ridge cost $5,342 million for 40% of an undeveloped deposit, a reminder of what the 1965 Robe River stake would cost to assemble now.
    Mitsui & Co. release, 19 February 2025 - acquisition of a 40% interest in the Rhodes Ridge iron ore project for $5,342 million. — February 2025 · publ. 19 February 2025 · source ↗
  18. ReportedAt 10.2% it is below the target and has fallen three years running; a recovery above 12% by the year to March 2029 would show the discipline outlasting the commodity cycle.
    Mitsui & Co. Integrated Report 2026, data section - results by operating segment: gross profit, equity-method profit, dividend income, core operating cash flow and total assets. — FY to March 2022-2026 · publ. 2026 · source ↗
Sources
Generated September 24, 2026