Taihan Fiberoptics대한광통신

Taihan Fiberoptics is loss-making on trailing numbers, with a share price that has swung sharply over the past year.

Trailing twelve-month revenue to H1 2026 is about ₩155.7B, but the company posted an operating loss of about ₩14.7B and a net loss of about ₩23.1B. Free cash flow is negative at about ₩20.8B, and borrowings of about ₩92.5B exceed cash of about ₩17.3B. The shares closed at ₩13,380 on 2026-10-26, well below the 52-week high of ₩31,500 but far above the 52-week low of ₩1,760.

What stands out

• Revenue fell in 2024 and 2025 (down 15.3% and 8.7%), and only 2022 showed an operating profit in the five-year annual data provided.
• Liabilities are 155.2% of equity, and the data shows a trailing ROE of -30.4%.
• Price moves are large: up 592.5% over one year but down 24.4% over one month, and P/B is 18.7 with no P/E because earnings are negative.
• Foreign ownership fell from 4.8% to 2.8% over the last 60 days, while the 20-day flows show foreign net selling of about ₩70.5B and retail net buying of about ₩76.3B.
• The company profile describes an integrated optical fiber and cable production system and subsidiaries in the US and France, but the data does not give segment revenue or order backlog.

What to watch

• The next quarterly results and whether operating losses narrow from the trailing H1 2026 level.
• Ongoing lawsuit matters flagged in the filings (an amended lawsuit filing dated 2026-06-10); the data does not give details or financial exposure.
• Insider and 5%+ holding reports, and any further changes in foreign ownership, which has been falling.