Okinawa's Election Is Not the Defence Story You Think

On Sunday the voters of Okinawa ousted Governor Denny Tamaki, a man who had spent eight years obstructing the Henoko airfield construction. His successor, Genta Koja, won with roughly 60 per cent of the vote and carries the endorsement of the national government in Tokyo. For the political correspondents, the result confirms Prime Minister Sanae Takaichi's growing grip on a prefecture that has long been Japan's thorniest internal dissent. For the defence contractor bull, it is one more sign the military build-up is unstoppable.

Both readings are defensible. Neither is very useful to an investor.

The Henoko base, first proposed in the 1990s, is a local dispute about whether American Marines should be relocated from a crowded urban air station to a new facility on the northern coast of Okinawa. It is a 30-year stalemate that finally broke this weekend. The construction itself involves dredging, reclamation, and the laying of runways and hangars. It is not, by itself, a significant source of revenue for the companies that appear on any Japanese defence stock list.

The financial story is elsewhere: in the scale and trajectory of Japan's defence spending, in the structure of the domestic industry that receives it, and in the valuations the market has already assigned to both.

The spending programme was not created by this election

Japan's defence budget has been on an upward path for more than a decade. The five-year Defence Buildup Program, launched in 2022 under the previous Kishida government, commits roughly ¥43 trillion ($280 billion) from fiscal 2023 through fiscal 2027. The fiscal 2026 budget — the most recent approved by Takaichi's cabinet — allocates ¥9.04 trillion ($58 billion), a 3.8 per cent increase. The Defence Ministry has already requested a record ¥8.9 trillion for fiscal 2027, which would be the 13th consecutive year of increases.

What is notable is not that the spending is rising — it has been rising regardless of which party sits in the prime minister's office — but that the debate has disappeared. In the 2015 "war bills" controversy, mass demonstrations mobilised. When the 2 per cent of GDP target was announced in 2022, there was barely a murmur. The Japan Innovation Party, Takaichi's coalition partner, agreed to form a committee on constitutional revision. The centre-right Reform Alliance shifted from calling for the repeal of emergency deployment provisions to accepting them. Even the Japanese Communist Party, which characterised the LDP as "subservient to the United States," could not organise an effective campaign.

There is no major political force in Japan arguing against the defence expansion. That makes it a structural flow rather than an electoral variable. And the Okinawa vote did not change the total.

Who benefits, and on what scale

The defence budget is split between platforms, weapons, personnel, research, and infrastructure. The companies that capture the largest share are Mitsubishi Heavy Industries (MHI, 7011.T), IHI Corporation (7013.T), Kawasaki Heavy Industries (6720.T), Japan Marine United, and NEC Corporation — a consortium of industrial giants that have held near-monopoly positions in Japan's domestic defence market for decades. Japan has deliberately cultivated this oligopoly through strict export controls that limited foreign competition at home while gradually easing outbound rules.

MHI is the dominant beneficiary. Its Aircraft, Defence & Space (ADS) segment recorded ¥1.4 trillion in sales for fiscal 2025. The company is the prime builder of the Mogami-class frigates, the Taigei-class submarines, and the domestically produced Type 12 cruise missiles — all core programmes funded in the current budget. In April 2026 it also secured Japan's largest postwar defence export: a deal worth up to A$10 billion to supply Australia with 11 upgraded Mogami-class frigates, the first three to be built at MHI's Nagasaki shipyard.

IHI's Aero Engine, Space & Defence segment benefits from the next-generation fighter programme (jointly developed with Britain and Italy, with a first flight scheduled for around 2030) and from Taigei-class submarine propulsion systems. Kawasaki shares in fighter, helicopter, and shipbuilding work. NEC entered into a strategic partnership with MHI in September to strengthen defence command-and-control and unmanned-asset systems.

These are real, multi-year revenue streams. The ¥43 trillion five-year programme is not a forecast or a hope — it is a committed budget, reauthorised annually, with specific procurement programmes already in execution.

The valuation problem

The trouble is that investors have known all of this for some time. MHI's shares, which traded around ¥4,400 at the low end of their 52-week range, have climbed to approximately ¥7,600 — an increase of around 70 per cent from their 52-week low of roughly ¥4,400. The market has rewarded a combination of defence tailwinds and a surge in gas-turbine orders (the company booked 31 large-frame gas turbine units in the nine months to December 2025, mostly for North America and Asia). But the reward has been generous enough to raise questions.

As of late August 2026 MHI's trailing P/E ratio stood at roughly 56 times — higher than any industrial equipment company in Japan, and well above the historical range of 10- to 20x that the stock commanded through most of the 2010s and early 2020s. Another source calculated a trailing P/E of about 32 times, using a different earnings-window; even that multiple is steep for a capital-intensive manufacturer. Morningstar's analysts labelled the shares as trading at an "overheated valuation" as recently as August, maintaining a fair value estimate of ¥2,660 — roughly a third of the market's current price.

A P/E of 56x implies that the market expects defence and energy margins to remain elevated and grow for years. That is not unreasonable if MHI executes flawlessly: the ADS segment's business profit margin has risen, and the Australian frigate deal provides genuine visibility. But it is a lot of faith to price into a stock that previously lost billions on its Regional Jet programme and its cruise-ship division, both of which had to be written off. The turnaround has been genuine — management exited loss-making projects and restructured operations. Yet turnarounds priced at 50-plus times earnings leave little room for execution slippage.

IHI presents a less stretched, but still demanding, picture. Its market capitalisation is a market capitalisation around ¥3.2 trillion. Its defence contribution is smaller than MHI's, but growing alongside the fighter and submarine programmes.

What the Okinawa result actually changes

Governor Tamaki's obstruction delayed, disrupted, and increased the cost of the Henoko construction — but the total cost of that single project is a tiny fraction of the ¥9 trillion annual defence budget. The domestic construction firms working on base infrastructure in Okinawa are not listed on major exchanges and are not what retail investors buy when they purchase a "Japan defence stock."

The political signal is more important than the financial one: a Takaichi-aligned governor in Okinawa removes the last elected obstacle to the Henoko project, as Tamaki himself acknowledged. Construction should now proceed more smoothly. That matters for alliance credibility — and for the optics of Japan's commitment to the United States. But it does not materially alter MHI's order book, its gas-turbine pipeline, or the defence budget ceiling.

The investment question

The relevant question for an investor is not whether Japan's defence spending will continue — the evidence suggests it will, regardless of who wins or loses local elections in Okinawa. The question is whether the domestic defence contractors that have benefited so far are fairly valued given what has already been priced in.

MHI offers the clearest case. The defence boom is real, the order backlog is at a historic ¥10.77 trillion, and the Australian export deal demonstrates that Japan's defence industry can now compete internationally. But a backlog of ¥10.77 trillion is spread over many years and across gas turbines, nuclear, and infrastructure, not just defence. The defence component is meaningful but not dominant. And at a valuation that trades at three times or more its historical multiple, the stock is no longer a value play on a turnaround. It is a conviction bet that execution will be flawless and that the defence cycle will continue to accelerate.

That conviction bet may be justified. It may not. The evidence from Okinawa does not help settle it either way.