Company history

Mitsui Bussan opened in July 1876 inside the Mitsui-gumi House in Nihonbashi, Tokyo, with no stated capital at all. The Mitsui family was preparing to become a bank and needed the risks of trade held in a separate legal body, so the new firm was given none of its own money: working capital for each transaction was borrowed from Mitsui-gumi and settled afterwards. Its head was Masuda Takashi, twenty-eight, who had left the Finance Ministry and learned Western bookkeeping, shipping and agency practice at Senshu Kaisha, the trading venture Inoue Kaoru had started in 1873.

A firm with no capital had to be made of something else, and Masuda made it of people — “the way of commerce lies in men,” as he put it — sending young staff to Shanghai, Paris, London and New York from the year after founding. The commercial footing came from the sole agency for coal from the state-run Miike mine, exported as steamer fuel to Shanghai, Hong Kong and Singapore. That single reliable line paid for the branch network, and the branch network was then used to carry anything else that would move: British spinning machinery inbound, Japanese cotton yarn outbound to China, then railway materials, minerals and fertiliser.

The logic that produced the sogo shosha — the general trading house — was defensive. Stake a business on one commodity and one bad market decides the company; spread across hundreds of goods and each weak line is carried by the others, while all of them share the same overseas network and the same credit standing. By the late Meiji years Mitsui Bussan handled several hundred product categories and roughly a fifth of Japan’s entire foreign trade. It reorganized as an unlimited partnership in December 1893.

In October 1909 the firm was incorporated as a joint-stock company with capital of ¥20 million. Prewar Mitsui Bussan was less a company than infrastructure: the overseas branches, product knowledge and long-standing counterparties through which Japanese industry reached international markets. Between 1937 and 1943 it handled an average of 18.3% of Japan’s total trade, and counting its cotton offshoot Toyo Menka the share reached a quarter. Divisions were spun out as they matured — the shipping department became Mitsui Steamship in December 1942.

That scale made it a target. When Britain left the gold standard in September 1931, Mitsui was accused of selling yen to buy dollars ahead of Japan’s re-embargo on gold exports; the ruling Minseito issued a denunciation on 5 November, and Mitsui Bussan published a rebuttal in the Chugai Shogyo Shimpo in December denying speculation. The attacks did not stop. On 9 March 1932 Dan Takuma, head of Mitsui Gomei, was shot dead at the entrance of the Mitsui Main Building by a member of the League of Blood.

War brought controls that left a trading house little to trade on its own account — the 1937 emergency measures on imports and exports and funds, then the 1938 National Mobilization Law, with imports rationed by foreign-exchange allocations tied to export performance. After the defeat, the Mitsui holding company was ordered dissolved in November 1945, and Mitsui Bussan itself was designated a holding company in December 1946. It began drafting its own break-up plan, splitting internally over whether to divide by product or by region, and finally offered several options for GHQ to choose from. On 5 July 1947 it received instead a copy of a memorandum dated 2 July: Mitsui Bussan and Mitsubishi Corporation were to be dissolved outright. No division into a handful of successors was permitted; survival in any form was refused. The firm broke into some 180 companies, and more than 200 trading firms were founded by its former staff.

The dissolution order was written to prevent revival. For ten years no successor firm could employ two or more people who had been directors or department heads in the previous decade, none could be formed by more than 100 employees, and the old offices and the old name were both forbidden. Some 3,000 male staff scattered. Thirty-seven of them, from the non-ferrous, food, fertiliser, chemicals, building-materials and planning departments, put up ¥195,000 and founded Daiichi Bussan on 25 July 1947, renting a former bank branch in Horidome and partitioning its atrium into a mezzanine for ¥6,000 a month.

What the order could not confiscate was the intangible stock of a trading house — customers, product knowledge, personal standing — which lived in individuals and travelled with them. Daiichi Bussan converted that into institutional credit fast: it listed on the reopened Tokyo Stock Exchange in May 1949, only the second trading company to do so, made the first public share offering in January 1949 that brought in seven major life insurers and then the casualty insurers, and in 1951 took $138,889 (¥50m) of foreign capital through a tie-up with Bache & Co., lifting capital to ¥200 million.

Recovering the name proved harder than recovering the business. When the peace treaty took effect in 1952 and zaibatsu names became usable again, fourteen presidents of former Bussan firms agreed to park “Mitsui Bussan” with Nitto Soko Tatemono until they could merge and claim it — but wrote nothing down. In July 1953 Muromachi Bussan, a steel trader, absorbed Nitto Soko and took the name for itself. Merger talks reached an eleven-point memorandum in August 1955, then collapsed over which firm would survive the merger: Daiichi Bussan was six times larger by sales and needed to be the surviving entity to write off ¥2.2 billion of bad debt for tax purposes. The deadlock broke only when the market did — after the Suez spike of October 1956 reversed, Muromachi Bussan was left holding scrap bought for steelmakers who then cut output, and could not fund its bills. Its lead banks, both close to Daiichi Bussan, wanted the merger. On 16 February 1959 it went through with Daiichi Bussan surviving, and the company changed its name back to Mitsui & Co.

Reunified, Mitsui met the raw-material appetite of high-growth Japan by moving upstream of its own trade: rather than merely contracting for supply, it bought into the mines. Australian coal at Moura in January 1963, the Robe River iron ore project in February 1965, a long-term Mount Newman iron ore contract in October 1966, and Brazil’s MBR in February 1971 — a stake that survives, through later restructuring, inside today’s Vale. Energy followed the same shape with the Das Island LNG agreement in Abu Dhabi in September 1971. In parallel it built out in America (Mitsui & Co. U.S.A., 1966), which grew into one of the five largest US exporters and became a quiet pillar of Japan’s export base during the trade frictions, and hived off finance into Mitsui Leasing in March 1971.

The same instinct produced the worst failure in its history. Behind Mitsubishi in oil, Mitsui pursued the Lorestan concession in Iran and was told that the concession required a Mitsui-group petrochemical project — so it accepted the petrochemical business as the price of entry, before the feasibility work was done. A fifty-fifty basic agreement was signed in October 1971, with Mitsui holding 60% of the Japanese investment vehicle. Then the oil shock pushed the construction budget from roughly $445.2M (¥130bn) to $2.5B (¥740bn), later cut back to $1.9B (¥550bn). There were voices inside the company for freezing or withdrawing; President Ikeda Yoshizo overrode them in the name of not turning back, declaring in the centenary year of 1976 that it must be carried through with resolve. Lorestan produced too little crude, so the two-legged plan of oil plus petrochemicals flew on one wing, with Mitsui carrying the construction.

Work stopped at the Iranian revolution in February 1979, with the plant 85% complete by weight. It was bombed during the Iran–Iraq war; Japanese remittances were suspended in April 1981; a supplementary contract agreed in July 1983 was voted down by the Iranian parliament. The five Japanese partners were spending ¥17.7 billion a year — about ¥100 million every two days — until liquidation finally closed the project in December 1990. Meanwhile the industry itself was being questioned: trading-house turnover, which had outgrown GNP by a fifth through the 1960s, merely matched it in the low-growth 1970s, and the press wrote of a “winter era” for the sogo shosha. Ataka & Co. collapsed over Canadian refinery crude and was rescued into Itochu, with sixteen banks absorbing some ¥200 billion of losses. Mitsui’s answer was to push further into oil — machinery for oil development, crude itself, and third-country trade selling developed oil wherever the market paid best, a freedom refiners, who could only bring cargoes home, did not have.

The 1990s took Mitsui upstream again — the Sakhalin II oil and gas production-sharing contract in June 1994 — while much of the industry’s bubble-era investment in property, services and telecoms came to nothing; among the general traders only the old zaibatsu houses kept investment-grade ratings, and Mitsui held its consolidated equity ratio in double digits. In June 2001 it created a retail division built around the chemicals team that supplied and ran logistics for Seven-Eleven Japan across 77 distribution centres, aiming to grow about ¥300 billion of annual business to ¥1 trillion — notably without taking equity, unlike Mitsubishi in Lawson or Itochu in FamilyMart.

Then the controls failed twice. On 3 July 2002 prosecutors arrested three employees over rigged bidding on a diesel power plant on Kunashiri Island, a ¥4 billion contract that had won an internal president’s award; President Shimizu Shinjiro cut his own pay by 20% for three months and refused to resign, and the investigation was run by the business unit’s own compliance committee rather than the company-wide one. He left soon after, and Utsuda Shoei made compliance the first priority and expanded internal audit — which promptly found the next fraud. In November 2004 Mitsui disclosed that it had obtained Tokyo Metropolitan certification for a diesel particulate filter using falsified data three times over, including reading inflated figures aloud to inspectors present at a 2003 test. Some 21,500 units already sold removed only 70–80% of the required particulates; a business that led the market with over ¥19.4 billion of sales turned into a replacement liability of comparable or greater size.

The resource cycle then did what resource cycles do. US Marcellus shale in 2010, Fairway Methanol in 2013 and Cameron LNG in 2014 extended the upstream portfolio; profit rose with prices to ¥410 billion in the year to March 2008 and ¥434.4 billion to March 2012 — and then Chilean copper impairments and shale write-downs produced a net loss of ¥83.4 billion in the year to March 2016, the first full-year loss since Daiichi Bussan was founded, immediately after Yasunaga Tatsuo took over. His response was to separate out the earnings that do not move with commodity prices — “basic earning power” — and manage its accumulation, restoring profit to ¥306.1 billion by March 2017 and ¥414.2 billion by March 2019, while becoming the largest shareholder of Malaysia’s IHH Healthcare and thickening healthcare, food and infrastructure alongside iron ore and LNG. Under Hori Kenichi, who succeeded him in 2020, profit reached ¥914.7 billion to March 2022 and crossed ¥1 trillion for the first time in March 2023 at ¥1,130.6 billion, repeating at ¥1,063.6 billion the next year before easing to ¥900.3 billion and ¥833.9 billion as prices fell. The company also stopped waiting to earn before promising: its 2026 medium-term plan introduced a progressive dividend and committed about 37% of three-year cumulative core operating cash flow to shareholder returns, later raised to 54%. In February 2025 it committed to Australia’s Rhodes Ridge iron ore project after twenty years of negotiation, aiming at 100 million tonnes a year — the same move as the Miike coal agency of 1876, made at a different scale.