Won rebound splits Korean shipbuilders on currency hedging

South Korea's major shipbuilders showed sharp earnings divergences on Oct. 6, 2026 after an 84-won drop in the dollar-won rate tested their foreign-exchange hedging strategies across $70 billion in order backlogs.

The Bank of Korea recorded an average dollar-won rate of 1,418 won for the third quarter of 2026. That marked a drop of 84 won, or 5.6%, from 1,502 won in the second quarter.

The currency closed September at 1,358 won per dollar. That represented an 11.9% decline from 1,541 won at the end of June, according to central bank exchange data.

South Korean shipbuilders price almost all commercial export contracts in US dollars. Yards collect milestone installments over three-year construction schedules, leaving unhedged shipbuilders exposed to swings between contract signing and final vessel delivery.

Samsung Heavy Industries insulated its balance sheet by running a 100% currency hedge. The Geoje-based builder sold roughly $22.6 billion in currency forward contracts, matching its entire order backlog of 29 trillion won ($21.4 billion).

Samsung Heavy recognized its third-quarter revenue at a fixed conversion rate near 1,327 won per dollar. The complete forward hedge prevented operating margins from shrinking during the quarterly currency decline.

The builder adopted the full hedge structure to eliminate foreign-exchange volatility from operating income. That strategy prevents windfall gains during currency depreciation, but it guarantees operating margins during rapid won appreciation.

HD Korea Shipbuilding & Offshore Engineering took a partial protection strategy. The intermediate holding company for HD Hyundai group yards maintained a 75% hedge ratio against net foreign-currency exposure, selling $24.8 billion in forward contracts.

That left about a quarter of group dollar exposure open to market spot rates. The unhedged balance reduced operating profit across its two main shipbuilding operating subsidiaries during the third quarter.

HD Hyundai Heavy Industries faces an estimated operating profit reduction of 38.7 billion won ($28.5 million). The yard loses roughly 4.6 billion won in quarterly operating profit for every 10-won drop in the dollar-won rate.

HD Hyundai Samho faces an estimated operating profit cut of 23.4 billion won ($17.2 million). The subsidiary carries an operating profit sensitivity of 2.8 billion won per 10-won change in the exchange rate.

Hanwha Ocean took an open position that exposed its operating margins directly to the currency swing. The builder maintained a forward hedge ratio of roughly 9% against its 35.3 trillion won ($26 billion) order backlog.

The shipbuilder held roughly $2.1 billion in forward sell contracts, leaving more than 90% of its order book unhedged. Hanwha Ocean maintained that open stance to fund dollar-denominated overseas assets, including Philly Shipyard in the United States.

Holding dollar cash flows helps Hanwha Ocean avoid conversion fees when funding foreign shipyard acquisitions and defense infrastructure. The strategy created short-term accounting friction as export revenues were converted into stronger local currency.

The 84-won drop in the average quarterly exchange rate reduced Hanwha Ocean's third-quarter operating profit by an estimated 89.8 billion won ($66.1 million). The builder loses 10.7 billion won in operating profit for each 10-won appreciation of the won.

The yard held the highest operating sensitivity to exchange rates among South Korea's three major shipbuilding groups. Financial filings submitted to the Financial Supervisory Service confirmed the diverging derivative contract balances across the three builders.

Shipyards built their operating budget models for 2026 around exchange rates in the mid-1,300 won range. The rapid drop in spot rates during September compressed contract margins that yards booked when the dollar traded above 1,500 won.

Steel plate purchases and domestic labor costs remain denominated in won. When the dollar weakens against the won, shipbuilders collect fewer local currency units on dollar milestones while paying unchanged domestic production bills.

South Korea's shipbuilding cohort will release third-quarter financial results in regulatory filings scheduled for late October 2026. Those filings will report how much derivative valuation adjustments offset operational margin losses.

The three shipbuilders have not published finalized third-quarter revenue, operating income or realized currency gains ahead of the scheduled late-October disclosures.