Company history

IHI traces its origin to a matter of national defence. In 1853, spurred by Commodore Perry’s arrival, the Tokugawa shogunate built a Western-style shipyard at Ishikawajima, on the estuary of the Sumida River in Edo. After the Meiji government sold off its state works, the engineer Hirano Tomiji took the yard into private hands in 1876 as the Ishikawajima Hirano Shipyard — building Japan’s first steamship and, in his restless hands, domesticating boilers, silk-reeling machines, crushers, iron bridges and elevators one after another. In 1889 the shipyard was reorganized into a company with the participation of Shibusawa Eiichi and others, incorporated as the limited-liability Ishikawajima Shipbuilding, and in September 1893, under the new Commercial Code, renamed Tokyo Ishikawajima Shipbuilding Co.

The path from a state works, through private ownership, to a joint-stock company was the typical pattern of Japan’s heavy-industry modernization in the Meiji era. But where the Mitsui, Mitsubishi and Sumitomo zaibatsu spread into shipping, trading and mining and fed those profits into their machinery arms, the non-zaibatsu Ishikawajima developed by pouring itself into heavy-machinery production alone. To hold its own against the combine-backed firms it had to stay a step ahead in both management and technology, and on a fragile industrial base that forced it to supply everything from raw material to finished part in-house, it grew the many-sided character that would later earn it the name “department store of machinery.”

Ishikawajima did not stay with its founding shipbuilding trade. Before the war it split off its automobile and aircraft arms — in 1929 the aircraft division became Tachikawa Aircraft and the automobile division the forerunner of Isuzu Motors — and in 1936 it entered steam turbines through a joint venture with Shibaura Seisakusho (now Toshiba). Renamed Ishikawajima Heavy Industries in 1945, it listed on the Tokyo Stock Exchange in 1949. When it opened the Tanashi plant and began making jet engines in 1957 — returning to aviation some thirty years after spinning it off — it was, despite the word “shipbuilding” still in its name, already a general-machinery maker heavy in land machinery. That very portfolio would become what Ishikawajima brought to the 1960 merger.

In December 1960 Ishikawajima Heavy Industries merged with the industry’s third-ranked Harima Shipbuilding to form Ishikawajima-Harima Heavy Industries — one of Japanese shipbuilding’s two great powers. President Toshio Doko had read early the decade-long shift from coal to oil and the coming demand for VLCC-class tankers, but Ishikawajima’s Tokyo yard on the Sumida estuary could build ships no larger than about 22,000 GT. Harima, by contrast, already owned a 40,000-GT dock at Aioi yet was so extremely weighted toward shipbuilding — about ninety percent — that it turned dangerously fragile in downturns. The merger was, in effect, a mutual exchange of plant and portfolio: Ishikawajima gained the big dock and moved into 40,000-GT ships, while Harima gained the stability of Ishikawajima’s thick land-machinery arm.

The combined firm employed some fifteen thousand and reached the second-largest build volume after Mitsubishi Heavy Industries; Hisashi Shinto’s production innovations turned the fit between the two companies into an order-winning power of low prices and short build times. But the boom did not last. From the 1970s oil shocks tanker demand thinned structurally, forcing painful layoffs in 1979 and again in 1987; through the 1990s a sharp yen and the rise of Korean and Chinese yards eroded competitiveness. A 2001 plan to combine shipbuilding with Kawasaki Heavy Industries was agreed and then abruptly scrapped five months later; in 2002 the company switched partners to Sumitomo Heavy Industries, founded IHI Marine United and spun the founding shipbuilding business out of the parent.

As shipbuilding shrank, IHI set aero-engines as its long-term axis — deciding on aggressive aviation investment in 1998 and acquiring Nissan’s aerospace business in 2000. It made parts for the major civil programs — GE’s GE90 and GEnx, Pratt & Whitney’s PW1100G — while producing the F110 for the F-2 fighter on the defence side, and it redeveloped its closed Toyosu shipyard land, converting the prime site into offices and the huge Park City Toyosu residential complex with Mitsui Fudosan. Concentration on aero-engines was hardening — less as an active choice than as the residue left once everything else was pared away.

In July 2007 the company changed its name from Ishikawajima-Harima Heavy Industries to today’s IHI — the first time in the century and a half since its 1853 origin that it let go of the two words at its core, “Ishikawajima” and “shipbuilding.” The shipbuilding business itself had already been spun into IHI Marine United in 2002; in 2013 it was consolidated into Japan Marine United, with IHI holding just 30 percent — a clear minority that completed, in institutional form, the effective retreat from the founding trade. Dropping “shipbuilding” from the name formally ratified the departure of a business already marginal in the revenue mix.

First, though, the numbers cracked. In 2008 the Securities and Exchange Surveillance Commission recommended a surcharge of about $15.4M (¥2bn) for false statements in IHI’s securities reports — the largest such penalty at the time. The company was then pressed to rebuild its internal controls even as it reshaped the portfolio: a boiler acquisition in 2009, the purchase of Germany’s venerable Steinmüller in 2014, and from 2016 a systematic shrinking of non-focus businesses to concentrate resources on four domains — aero-engines, turbochargers, defence and social infrastructure. Construction machinery was sold and small engines handed to Caterpillar; with high barriers to entry and a long-lived earnings base, aero-engines naturally rose as the central axis.

That concentration carried a hidden cost. In June 2021 IHI found that its aero-engine parts needed wide-ranging additional inspections — the first tremor of a dependence in which a single quality problem could reach the whole of its results. The reckoning would come in the years that followed.

The danger of a single-domain business arrived in full in the year ended March 2024, when a problem tied to the PW1100G geared-turbofan program pushed IHI to a record net loss of $450.2M (¥68bn). A concentration reached by elimination rather than by choice had little ability to spread risk across fields, so a wave of costs arriving from outside ran straight into the earnings base. Then, in 2024, misconduct surfaced again: fuel-consumption data at the subsidiary IHI Power Systems had been falsified as an undocumented shop-floor practice for some forty years — the second time, after the 2008 accounting case, that the gap between reality and the values IHI disclosed had cracked open.

Under President Hiroshi Ide and his Group Management Policy 2023, IHI kept pruning. In April 2023 it sold IHI Power Systems’ large marine-engine business to Mitsui E&S and cut loose its vehicle-turbocharger and concrete-materials businesses, redirecting the cash and people it freed into the now mass-producing PW1100G-JM civil aero-engines and into decarbonization — ammonia and small nuclear reactors. Air-travel demand recovered and maintenance, repair and overhaul earnings grew; net profit rebounded the following year to $753.1M (¥113bn), and the company lifted its dividend.

The strategic question left open is whether a concentration that was left over can be rebuilt into one chosen on purpose — how far to thicken the other pillars of defence and decarbonization, and how to hold risk divided among them. Alongside it runs a second question the two episodes of misconduct forced back to the surface: for a company that prides itself on engineering, how to govern the measured numbers that underwrite that engineering. The next reconstruction rests on both.