DTS up 79% on debut, but no filing backs the move

As of about 1:30 p.m. KST, Oct. 23, 2026 (intraday prices)

Key points

• KOSPI is at 5,502.20 (-0.57%) and KOSDAQ (tech- and small-cap-heavy market) at 746.77 (-2.27%), yet three stocks are up more than 20%.
• DTS is up 79.19% on its first trading day, with 593.8 billion won traded.
• Speco is at the 30% daily limit, and Giantstep is up 20.5%.
• None of the three has a company filing that directly explains the rise.

Seoul — Three small KOSDAQ stocks are rising more than 20% while the index falls over 2%. For DTS and Speco, news reports offer a reason but the companies have filed nothing, and for Giantstep neither filings nor news explain the move. We will update this article with closing figures after the market closes.

DTS (0015M0): up 79% on debut on expectations, with no company filing

DTS, which listed on KOSDAQ today, is up 79.19% at 33,150 won as of 1:30 p.m. There is no prior price on a debut day; working backward from the gain implies a reference price of about 18,500 won. Namdo Ilbo reported the stock topped 40,000 won intraday, and several outlets including The Fact and Economy Today reported it doubled (100% gain) early on, but the gain has since narrowed. Trading value is 593.8 billion won and market cap is 493.3 billion won.

Prime Economy ran a story saying DTS's cooling technology is essential for AI data centers and positions it for U.S. and Saudi projects. The company has not confirmed any such contract or project in a filing, so the rise rests on expectations for now. Debut-day flows also tend to move prices sharply.

To judge whether it lasts, watch where the close lands against the reference price and whether trading value stays in the hundreds of billions of won the next day. The date institutional lock-ups expire and the tradable share count are also worth checking.

Speco (013810): defense-stock rally lifts it to the daily limit, no filing

Speco is up 29.98% at 2,055 won, the 30% daily limit, as of 1:30 p.m. Newspim reported defense stocks surged on talk about Kim Jong Un's whereabouts and named Speco's limit-up, while Newsis ran a headline asking whether rumors of his death were behind the defense rally. DART (Korea's official disclosure system) shows no Speco filing in the past seven days.

The stock rose 15.25% yesterday, up 44.3% over two days. Yesterday's reason was different: Pinpoint News said road-infrastructure investment hopes were drawing attention to asphalt-related stocks. Market cap is just 30.1 billion won and trading value 12.7 billion won, so a single report can move the price a lot.

Two things to watch: whether the whole defense group fades once the security headlines quiet down, and whether Speco issues any filing tied to this move.

Giantstep (289220): no known reason for the rise

Giantstep is up 20.5% at 1,781 won as of 1:30 p.m., and no filing or news explains it. Its four filings in the past seven days are an extraordinary shareholder meeting result, an independent director notice, an exchange request for an explanation of the price swing, and the company's Oct. 21 reply saying it had no material information to disclose.

The stock is up 118.5% from its Oct. 15 close of 815 won. It rose about 30% on both Oct. 16 and Oct. 20, and after Oct. 21 reports said it might be designated an investment-warning stock. It is up 73.8% in five days, so volatility is extreme.

Watch whether the investment-warning designation is actually imposed, and whether trading value holds up without any new filing.