Seoul Semiconductor Hits Limit-Up as KOSDAQ Falls 2.3%: No DART Filing (Oct 29, 2026)

Basis: Oct 29, 2026, 16:31 KST. Market figures are closing prices; intraday figures are labeled as such.

Seoul — KOSDAQ (Korea's tech- and small-cap-heavy market) fell 2.34% on Oct 29, yet KOSDAQ-listed Seoul Semiconductor (046890) closed at the 30% daily limit, and newly listed TNE Korea (0053F0) rose 39.87% on its first day. CTR Mobility (308170), a KOSPI-listed stock, also closed at the limit. None of the three has a company filing that explains the move. Only Seoul Semiconductor has a concrete reported reason, a rare-earth-free LED, while no reason for CTR Mobility's jump has been reported.

Key points

• KOSPI closed at 5,937.66 (-1.24%) and KOSDAQ at 753.23 (-2.34%). KOSPI had risen 6.63% the day before, per Seoul Shinmun.
• Two limit-ups: Seoul Semiconductor (+29.93%) and CTR Mobility (+29.86%). TNE Korea, a new listing, rose 39.87%.
• No stock had its rise confirmed by a company filing.
• Trading value: TNE Korea 543.2 billion won, CTR Mobility 8.7 billion won, Seoul Semiconductor 4.6 billion won.
• Overheating signals: CTR Mobility 3/4, Seoul Semiconductor 0/4.

At a glance

TNE Korea (0053F0): up 40% on listing day after trading near +96%

TNE Korea rose because buyers piled in on its first day on KOSDAQ. The close of 21,400 won was 39.87% above the offer price, which works out to about 15,300 won from the percentage move. Yonhap reported that it touched "ddoble" (double the offer price) intraday, and Jaekyung Ilbo reported a 96% gain around 10:31 a.m. By 1:30 p.m. it was up 44.44% (22,100 won), and it closed below 40%. Newswell headlined it "doubled, but ran out of steam." Trading value was 543.2 billion won.

The company has filed nothing, and no specific catalyst has been reported. Because it is a debut, there is no prior price history for 20-day-average measures. At the close, sell orders of 23,964 shares outweighed buy orders of 17,664. It passed 1 of 4 fundamentals checks: revenue grew 180%, but it is loss-making and fails the debt test.

Whether the gain holds depends on when institutional lock-ups expire and how many shares then become tradable. Also check whether trading value on day two stays near the first day's 543.2 billion won and whether the price holds above the 21,400 won close.

Seoul Semiconductor (046890): second straight limit-up on a rare-earth-free LED report, with no filing

Seoul Semiconductor closed at the 11,200 won limit on news of a micro white LED made without rare earths. Wide Economy, News1 and Lead Economy reported it, and Newsis said affiliate Seoul Viosys would cut costs by half. Seoul Viosys also hit the limit, according to the reports. But the company has filed nothing on DART (Korea's official disclosure system) in the past seven days, so the company has not confirmed the reports in a filing.

The stock also rose 29.95% the day before, for 34.5% over two days and 37.4% over five. The reports found are all dated Oct 29, so the reason for the Oct 28 gain is not established. Foreign investors were net buyers of 29,667 shares on Oct 27.

Overheating signals are 0/4, rated normal. It is 18.1% above its 20-day average, volume was 4.6 times the 20-day average, and RSI is 55.5. The five-day gain of 37.4% is under the 40% threshold. Even after two limit-ups it sits at 43% of its 52-week range and 38.7% below the 52-week high, 9.5% above its 200-day line. It passed 3 of 6 fundamentals checks; revenue grew 16.1% but the company is loss-making. Limit-up buy orders at the close were 306,438 shares.

To judge whether this lasts, look for the company to confirm development and mass production in a filing or official release, including timing and customers. Whether buy orders remain at the limit tomorrow is also worth checking.

CTR Mobility (308170): no reason for the jump has been reported

CTR Mobility rose 29.86% to a 5,110 won limit-up close, and no filing or report explains why. What exists is insider buying. According to DART and related reports, CEO Kang Sang-woo, the largest shareholder, and relative Kang Tae-ryong bought 13,000 and 7,000 shares on Oct 28, adding 20,000 shares and lifting the largest shareholder group's stake 0.23 points to 49.63%. We classify the filing as neutral. For a company with a market cap of 44 billion won it is a signal, but it is hard to see it explaining consecutive limit-ups. Maekyung Market listed the stock on the morning of Oct 29 as a "golden cross" breakout.

It is up 68.4% over five trading days. Foreign investors were net sellers of 26,990 shares on Oct 28 while individuals bought 27,411. Overheating signals are 3/4, strong overheating: 48.4% above the 20-day average, volume 17.5 times the 20-day average, RSI 77.0. It sits at 36% of its 52-week range and 43.8% below the 52-week high. It passed 0 of 6 fundamentals checks, with revenue down 7.5%. At the close, 16,280 shares of limit-up buy orders remained. Trading value of 8.7 billion won is about 20% of its market cap.

What to check: whether the company explains the surge in a filing, or the exchange issues a disclosure inquiry, whether the largest shareholder group buys or sells further, and whether trading value stays near 8.7 billion won tomorrow.

What happened to the stocks we covered before

Four of the six stocks judged "report only" have fallen since. Lunit and Contec rose, but DTS, Speco and MS Bio dropped close to 30% within three or four trading days. SKAI, judged "filing," fell 13.3%, and Giantstep, whose reason was never found, fell 18.9%. A confirmed filing did not guarantee that the price held.