Volatility is expanding in the domestic stock market as optical communication and optical semiconductor-related stocks decline across the board. As of 1:42 p.m. on the 13th, major stocks including Daehan Optical Communication, Seoul Semiconductor, Woorinet, Fiberpro, Jaram Technology, TMC, Mercury, and LS are all recording losses.

Daehan Optical Communication Widens Losses Amid Surging Trading Volume

Daehan Optical Communication is trading at 11,150 won, down 11.51% from the previous trading day. During the session, it rose to 13,250 won before falling back to 11,000 won. Trading volume exceeded 11.15 million shares, showing the most active movement among related stocks. The current price is 150 won above the intraday low, meaning the stock remains near its lows despite the surge in volume. However, trading volume alone makes it difficult to determine the future direction of the stock price.

Optical Semiconductor Stocks See Shrinking Investor Sentiment

Seoul Semiconductor, a leading optical semiconductor stock, is trading at 9,300 won, down 7.55%. It recorded an intraday high of 10,240 won and a low of 9,180 won, as the stock price, which had been hovering above 10,000 won, widened its losses and fell to the 9,000 won range. Seoul Biosys is also trading at 5,660 won, plunging 14.63%. It rose to 7,050 won during the session before dropping to 5,610 won. The simultaneous decline of both stocks is leading to a contraction in investor sentiment across the optical semiconductor theme.

Woorinet, Fiberpro, and Other Optical Communication Stocks Decline Across the Board

Woorinet is at 7,150 won, down 7.38%. It rose to 7,970 won intraday before falling to 7,080 won, and the current price is 70 won above the intraday low, with weakness continuing without a clear rebound. Fiberpro is trading at 12,690 won, down 6.69%, with an intraday high of 13,990 won and a low of 12,660 won. The current price is only 30 won above the intraday low.

Jaram Technology fell 8.47% to 21,600 won on a volume of 38,216 shares. It rose to 24,000 won intraday before retreating to 21,550 won. Mercury is down 8.17% at 3,315 won, with an intraday high of 3,775 won and a low of 3,295 won, leaving the current price just 20 won above the low. TMC is down 5.54% at 11,080 won; while the decline is smaller compared to other stocks, the current price is also forming near the intraday low. LS is down 8.36% at 301,500 won, having risen to 337,750 won intraday before falling to 301,000 won, with the current price 500 won above the low.

Other Stock Movements

Korea Advanced Materials fell 11.90%, Lycom 11.83%, Kwang Myung Electronics 9.25%, and Bit Ssem Electronics 8.80%. RFHIC declined 9.79% and RF Materials 3.83%. Meanwhile, Bit Gwa Electron rose 3.66% to 2,410 won, marking the only upward trend. It climbed to 2,870 won intraday before falling to 2,320 won, with trading volume exceeding 40.54 million shares.

Investment Considerations

Based solely on the intraday quotations provided, it is difficult to attribute the broad decline of optical communication and optical semiconductor stocks to any specific company's negative news or changes in industry outlook. Even within the same thematic category, the factors affecting each company's actual business areas and earnings performance differ. Rather than relying solely on short-term fluctuations of the overall theme, investors should separately examine each company's revenue structure, new orders, earnings forecasts, and financial condition. Stocks with large intraday declines may carry the possibility of a technical rebound, but they also carry heightened risks of additional volatility.

[※ This article is an investment reference material written with AI assistance based on intraday market data provided. It does not recommend the purchase or sale of any specific stock, and investment decisions and their consequences are the sole responsibility of the investor.]