IS Dongseo아이에스동서

IS Dongseo is profitable on a trailing basis after losses in 2024 and 2025, but its shares have fallen about 23% over the past year.

IS Dongseo is a Korean building materials and construction group with concrete, construction and environment businesses. On trailing twelve months to H1 2026 it reported revenue of about ₩1.15T, operating income of about ₩105B and net income of about ₩82B, after net losses in 2024 and 2025. The shares closed at ₩14,250 on 2026-10-23, near the 52-week low of ₩13,860.

What stands out

• Revenue fell in each of 2023, 2024 and 2025, with 2025 revenue down 18.5% to about ₩1.23T.
• Trailing operating margin is 9.1% and net margin 7.1%, well below the 2021 to 2023 levels of roughly 15% to 19% operating margin.
• Liabilities are 114.3% of equity, and trailing borrowings of about ₩70B are covered by cash of about ₩370B.
• The company's own discounted cash flow estimate is ₩57,613 per share (bear ₩40,520, bull ₩86,905), well above the current price; this is a model output, not a forecast.
• Recent filings are mostly 5%+ holding reports and an insider shareholding report, plus one major supply contract on 2026-10-01; news headlines cover a local commendation and a risk management system plan.

What to watch

• Next periodic results, to see whether trailing profit holds up against the 2024 and 2025 net losses.
• Foreign ownership has slipped from 7.4% to 6.6% over 60 days and foreign investors were net sellers over the last 20 days, so further flows are worth tracking.
• Whether the 5%+ holding reports and insider filings signal any change in shareholder structure; the data does not explain their purpose.