Korea's defence order book keeps growing. The margins peaked last year.

Hyundai Rotem sold 13.3% more in the second quarter of 2026 than it did a year earlier, and earned 9.7% less doing it. Revenue was ₩1.606tn, operating profit ₩232.4bn. The same filing reported an order backlog of ₩30.4046tn — above ₩30tn for the first time in the company’s history.

Both facts are true and they point in opposite directions. That gap is the most useful thing in this year’s Korean defence numbers, and it is not what the sector is being priced on.

Three companies, three directions

Hanwha Aerospace, Hyundai Rotem and LIG Defense & Aerospace all reported the June quarter within a fortnight of each other. Read at the headline level, all three are booming. Read at the margin line, they separate.

The year-earlier margins for Hanwha and Rotem are computed from the growth rates the companies reported; LIG published its own comparison. Hanwha Aerospace’s consolidated result was a record — ₩9.2929tn of revenue and ₩1.3655tn of operating profit, the first time the group has cleared a trillion won in a quarter. Almost none of that came from the guns. Hanwha Ocean, consolidated into the group, contributed ₩736.1bn of it on the back of the LNG carriers that are carrying Korean yards this year, with operating profit up 98%. Strip the shipyard out and the defence engine grew profit by 2%.

Why the premium fades

Korean contractors have been unusually candid about the arithmetic underneath the boom. Domestic programmes negotiated with the Defense Acquisition Program Administration carry margins of roughly 2–5% by design; the state buys at cost-plus and the plus is small. Export contracts are priced by negotiation with a foreign ministry of defence, and for the past four years they have been priced by a foreign ministry of defence in a hurry.

That is the whole story of the margin expansion between 2021 and 2025. Hanwha Aerospace’s operating margin went from 5% in 2021 to 11.4% in 2025. Hyundai Rotem’s went from 4.66% in 2022 to 17.22% in 2025. Korea Aerospace Industries went from 2.27% to 7.28%. None of those companies got three times better at building things in four years. Their customer mix changed.

Customer mixes revert. The first Polish framework was signed in 2022 and executed in tranches; the tranches being built now were priced against a different won, a different steel cost and a different competitive field. Buyers who signed in a panic have had four years to learn what the market clears at, and the deals being negotiated in 2026 come with conditions the 2022 deals did not: local assembly, technology transfer, offset obligations, decades of maintenance work. Those terms are what make an export relationship durable. They are also structurally lower-margin than putting a finished howitzer on a ship in Changwon.

DAPA’s own framing describes the shift approvingly — the industry moving from finished-product exports to what it calls ecosystem exports, transplanting supply chains into customer countries. That is almost certainly the right strategy. It is not a margin-accretive one.

The export total and the profit have come apart

Korea’s 2025 defence exports were $15.4bn on DAPA’s first official tally, up 60.4% on a weak 2024. It is worth being precise about what that number is not. It is not a record: 2022 was $17.3bn. It is not the government’s target either, which was $20bn. And it counts contracts signed, not equipment delivered, which is why a single ₩5.6tn Chunmoo execution contract signed with Poland on 30 December swung the year.

Now put that next to the earnings. The big four — Hanwha Aerospace, Hyundai Rotem, LIG and KAI — booked combined revenue of ₩40.45tn in 2025 and operating profit of ₩4.63tn. Both were all-time highs, in a year when the headline export figure was 11% below its 2022 peak.

So the export tally and the profit line have decoupled, and the decoupling ran in the industry’s favour for three years. There is no reason to assume it only runs that way. The Export-Import Bank of Korea’s research institute expects 2026 exports above $27bn, which would be comfortably a record. Two of the three companies above are already converting that order flow into less profit per won of revenue than they did last year.

What LIG is doing differently

LIG Defense & Aerospace is the counter-example, and it matters because it shows the compression is not simply what happens when exports grow. Its margin rose to 9.5% from 8.6% precisely because exports grew — to 25.4% of revenue from 17.4%. LIG’s export book is weighted to Cheongung-II air defence sales into the Middle East, negotiated later and in a market where the alternatives are American and expensive.

The catch sits in its order intake. LIG booked ₩326.35bn of new orders in the second quarter against ₩1.1101tn of revenue, and its backlog grew only ₩1.11tn over the twelve months to end-June, to ₩24.57tn. A book-to-bill under 0.3 for a quarter is not a crisis in a business with lumpy multi-year contracts. It is a reminder that the pipeline everyone is extrapolating is being consumed faster than it is being refilled at some of these companies.

There is also a currency question sitting under all of it. Export contracts signed in dollars and built with won costs have been flattered for four years by a won that has stayed weak while Korea’s exports boomed. That tailwind is a price, not a capability, and it is not permanent either.

None of this argues the boom is over. Sixteen destination countries in 2025 against seven in 2022 is a structural change in who buys Korean equipment, and the maintenance obligations attached to a K9 fleet in Finland or Egypt will produce revenue into the 2040s. The argument is narrower: the extraordinary margins of 2024 and 2025 were a function of when those contracts were signed, and that window has closed. An investor treating 17% operating margins at a tank manufacturer as the new baseline is extrapolating a moment.

Figures current as of 29 August 2026, sourced to the company filings and outlets listed below. Company results are second-quarter 2026 preliminary figures on a consolidated basis; year-earlier margins for Hanwha Aerospace and Hyundai Rotem are computed from reported growth rates. Nothing here is investment advice — see the disclaimer.