GS Engineering & Construction: Share price up 60.1% over a year but down 21.8% in the past month, with thin profit margins

Thesis

The data supports a recovery story in earnings: operating income went from a loss of ₩387.9B in 2023 to ₩285.95B in 2024, ₩437.8B in 2025 and ₩370.2B over the trailing twelve months to H1 2026. The share price has risen sharply over a year, from a 52-week low of ₩17,880 toward a high of ₩44,850, but the recent 1-month drop of 21.8% shows large swings. The data does not support a view of strong profitability: net margin is 1.1%, ROE is 2.8%, and liabilities are 229% of equity. Revenue has also declined for two straight years (-4.3% in 2024, -3.2% in 2025). Valuation looks low on book value (0.5x) but not on earnings (P/E 19.7). Investor flow, foreign ownership and short balance data are not available, so the reasons for the recent price move cannot be read from flows.

Business overview

The company is a KOSPI-listed construction firm founded on 1969-12-19 and listed on 1981-08-03, with 85,581,490 listed shares and a market capitalization of about ₩2.6T. It is run by co-CEOs Heo Yoon-hong and Kim Tae-jin. Annual revenue was ₩9.0T in 2021, rose to ₩12.3T in 2022 (+36.1%) and ₩13.4T in 2023 (+9.2%), then eased to ₩12.9T in 2024 and ₩12.5T in 2025. Trailing revenue to H1 2026 is ₩11.4T. Recent filings include several major sales or supply contract reports and amendments in September and October 2026, a business suspension major matters report amendment on 2026-09-22, and an IR event on 2026-09-07. The filing titles alone do not give contract sizes or counterparties.

Financial analysis

These figures come from filed financial statements (DART). Operating margin was 7.2% in 2021, 4.5% in 2022, -2.9% in 2023, 2.2% in 2024 and 3.5% in 2025; trailing it is 3.3%. Net income was ₩408.5B in 2021, ₩339.3B in 2022, a loss of ₩481.9B in 2023, ₩245.6B in 2024 and ₩93.5B in 2025. Trailing net income is ₩130.5B (net margin 1.1%). Net income fell in 2025 even as operating income rose, and the data does not explain why. ROE was 8.8% in 2021 and 5.6% in 2024, and is 2.8% now. Cash is ₩2.47T and trailing free cash flow is ₩259.7B. Liabilities-to-equity is 229%. Borrowings data is not available.

Valuation

The stock trades at a P/E of 19.7, a P/B of 0.5, a P/S of 0.2 and a dividend yield of 2.3%. At the end of 2025 the P/E was 18 and the P/B was 0.4, so the earnings multiple is slightly higher and the book multiple modestly higher than at that point. Earlier year-end multiples are not available. Among peers, Hyundai Engineering & Construction has a P/E of 24.9 and P/B of 1.2, Daewoo Engineering & Construction a P/B of 1.8, and DL E&C a P/E of 4.0 and P/B of 0.5. GS E&C's P/B matches DL E&C's and sits below the other two. Enterprise value is listed as ₩110.9B, far below market cap, reflecting the large cash balance, though EV/EBITDA is not available.

Catalysts

• Several major sales or supply contract reports and amendments were filed between 2026-09-10 and 2026-10-02, which may affect the order backlog.
• An amended major matters report on a business suspension was filed on 2026-09-22, and its details are not in the data.
• A 5%+ holding report (2026-10-02) and an insider shareholding report (2026-10-06) were filed recently, which can signal changes in ownership.
• The next set of financial statements will show whether the trailing operating margin of 3.3% holds.
• News on 2026-10-13 covered AI-based construction site safety and a partner event, but there is no financial detail in the headlines.

Risks

• Margins are thin, with a trailing net margin of 1.1% and ROE of 2.8%, leaving little cushion against cost overruns.
• The 2023 loss of ₩481.9B shows earnings can swing sharply in this business.
• Liabilities are 229% of equity, and borrowings data is not available to assess debt in detail.
• Revenue has fallen two years in a row, and trailing revenue of ₩11.4T is lower still.
• The share price fell 21.8% in one month, and without flow or short-interest data the drivers are unclear.

Closing view

The data shows a company that has recovered from a 2023 loss to modest profitability, with a low price-to-book ratio, a solid cash balance and positive free cash flow. Against that, revenue is shrinking, returns are low, leverage is high and the share price has been volatile. Missing information on flows, borrowings and the contents of recent filings limits how far these points can be taken, so the picture is mixed rather than clearly favorable or unfavorable.

Model estimate of fair value

The valuation model has no estimate for this company yet (not enough data, or no positive value with the base case).

Report history

1. Oct 13, 2026InitiationGS Engineering & Construction: Share price up 60.1% over a year but down 21.8% in the past month, with thin profit margins