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JONBUR Research · Initiation

Taihan Fiberoptics · 010170 · Electrical equipment

Taihan Fiberoptics: Share Price Up Sharply While Reported Losses Continue

Why this report

Start of coverage: one of the 300 largest companies, written once its financial statements were in.

Taihan Fiberoptics closed at ₩15,720 on 2026-10-12, up 1040.0% over one year, with a market cap of about ₩1.7T. Filed statements through H1 2026 still show operating and net losses, negative free cash flow and a price-to-book ratio of 15.5.

Written Oct 13, 2026 · Data as of Oct 12, 2026 · 0 views

This is not financial advice. The report does not recommend buying or selling anything.

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Thesis

The data supports a strong market re-rating: the share price rose 11.1% in one month, 44.1% in three months and 1040.0% in one year, and sits well below the 52-week high of ₩31,500 but far above the low of ₩1,272. The data does not show a matching improvement in earnings. Trailing revenue is ₩155.7B, the operating margin is -9.5% and net margin is -14.8%. Losses have narrowed from 2024, which is a positive, but the company has been loss-making in four of the five years shown. Investor flow, foreign ownership, short balance and news data are not available, so we cannot say who is driving the move or why.

Business overview

Taihan Fiberoptics is a KOSDAQ-listed company in the electrical equipment sector, founded in 1974 and listed in 1994, with 109,511,166 listed shares. It has two co-CEOs. Revenue was ₩156.6B in 2021, peaked at ₩190.1B in 2022, then fell to ₩180.3B in 2023, ₩152.7B in 2024 and ₩139.4B in 2025. Trailing twelve-month revenue to H1 2026 of ₩155.7B suggests a recovery from the 2025 level. The data does not describe products or customers.

Financial analysis

All figures come from filed financial statements (DART). 2022 was the only profitable operating year, with operating income of ₩3.5B (1.8% margin). Operating losses were ₩23.2B in 2023, ₩29.7B in 2024 and ₩21.4B in 2025. Net losses were ₩29.5B in 2023, ₩56.0B in 2024 and ₩28.0B in 2025. Trailing figures to H1 2026: operating income -₩14.7B, net income -₩23.1B, return on equity -30.4%. Liabilities to equity is 155.2%. Cash is ₩17.3B against borrowings of ₩17.7B, so cash roughly covers debt. Free cash flow is -₩19.1B, meaning operations and investment are consuming cash.

Valuation

With negative earnings, price-to-earnings and EV/EBITDA cannot be calculated, and no dividend yield is available. Price-to-book is 15.5 (3.7 at the end of 2025) and price-to-sales is 11.1. Listed peers with available data trade at price-to-book of 2.5 to 9.8, so the stock is at a higher book multiple than all of them. Peer price-to-earnings ratios range from 14.2 to 36.2, but are not comparable because the company has no earnings. Enterprise value is about ₩1.72T. Our simple five-year DCF fair value model could not be worked out (null), so there is no model range to compare with the ₩15,720 share price.

Catalysts

  • The half-year report filed on 2026-08-14 gave the latest financials, and the next periodic filing will show whether losses keep narrowing.
  • Repeated insider shareholding and 5%+ holding reports in June and July 2026 point to changes in major holders' positions.
  • Insider specific-securities trading plan reports filed on 2026-05-22 indicate planned insider transactions.
  • An amended lawsuit filing on 2026-06-10 means the outcome of that case could matter, though the details are not in the data.
  • Trailing revenue of ₩155.7B is above the 2025 level of ₩139.4B, so continued growth could matter for margins.

Risks

  • The company has reported operating losses in four of the last five years and is still loss-making on a trailing basis.
  • Free cash flow of -₩19.1B and borrowings of ₩17.7B against cash of ₩17.3B leave limited cushion if losses continue.
  • A price-to-book of 15.5 and a 1040.0% one-year gain leave the share price sensitive to a change in sentiment.
  • Liabilities are 155.2% of equity and return on equity is -30.4%, showing a stretched balance sheet.
  • Investor flow, short interest and news data are unavailable, and a lawsuit is pending with undisclosed details, which limits visibility.

Closing view

The evidence shows a large gap between market pricing and reported fundamentals. The share price and price-to-book have risen far above peers, while filed statements still show losses, negative free cash flow and a leveraged balance sheet, although losses have narrowed since 2024 and revenue is recovering. With no model fair value and no flow or news data, the data cannot explain the valuation, and future filings will be the main way to test it.

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).

Filings and data used

Report history

  1. Oct 13, 2026InitiationStart of coverage (300 largest)Taihan Fiberoptics: Share Price Up Sharply While Reported Losses Continue

Built only from jonbur's own data: prices and investor flows, filed financial statements and filings, and news headlines. Disclosed (filed) data is labelled as such. Written by AI and may contain mistakes.

This is not financial advice. The report does not recommend buying or selling anything.

Source: KRX statistical information