Why Are Brils, Winpac and LK Samyang Surging? KOSDAQ Up 4.48% on Oct 1, 2026
The KOSDAQ (tech- and small-cap-heavy market) rose 4.48% on Oct 1. Brils is a new listing, Winpac has press reports but no filing, and LK Samyang has no confirmed reason.
Seoul — The KOSPI closed at 6,971.35 on Oct 1, up 133.31 points (1.95%), and the KOSDAQ, Korea's tech- and small-cap-heavy market, closed at 894.29, up 38.38 points (4.48%). The KOSDAQ gained more than twice as much as the KOSPI. This article checks why three of the day's top gainers rose, using disclosures and news headlines. Data is as of 4:30 p.m. KST on Oct 1.
Brils: Debut-day jump, no filing collected
Brils (468670) listed on the KOSDAQ on Oct 1 and closed at 31,250 won, up 60.26%. Trading value was 636.5 billion won (6,345 eok won) and market capitalization was 355.1 billion won. It was the first trading day, so 2-day and 5-day changes cannot be calculated. No disclosures from the past seven days were collected. The new listing is the backdrop for the move, and no filing explains the rise.
Newsis ran the headline 'Robot company Brils closes up 56% on KOSDAQ debut (roundup)'. Its 56% differs from the 60.26% in our data. Headlines from Kyeonggi Ilbo, Newspim and Marketink stressed expansion in AI robotics and physical AI. Headlines alone do not confirm that these plans drove the price.
Volatility was large. Jobpost reported an intraday high of 62,100 won, and ebn.co.kr's headline said the stock 'tripled, then fell 51% from the peak'. The close was well below the intraday high. The data holds no IPO price or subscription ratio, so none are given here.
Winpac: Press reports only, no filing
Winpac (097800) rose 26.36% to 3,835 won. It is the third straight day of large gains: 25.32% on Sept 29 and 29.98% on Sept 30. Against the Sept 28 close of 2,335 won, the stock is up 64.2% over three sessions. Trading value was 33.2 billion won and market cap was 104.7 billion won.
DART, Korea's official disclosure system, shows no Winpac filings in the past seven days. The reason comes from news alone. Widedaily.com reported on Sept 30 that the stock hit the 30% daily limit on news that SK Hynix had assigned DDR4 and DDR5 DRAM packaging outsourcing volume. Kumgang Ilbo and moneystorm.kr cited expectations that SK Hynix would expand back-end DRAM outsourcing. On Oct 1, Maeil Business Newspaper Market mentioned a rally in HBM (high-bandwidth memory) stocks. Financial News listed Winpac with Semitis, QRT, TFE and SNS Tech in its afternoon semiconductor issues. The data does not show how much those stocks rose.
Investor flow data runs through Sept 30. Over the five sessions from Sept 22 to Sept 30, foreign investors were net buyers of 28,975 shares and individuals were net sellers of 45,222 shares. Oct 1 is not included.
There are counterpoints. The outsourcing report is not backed by a filing or a company statement. The stock has also risen sharply for three days in a row. The most recent broker report is from September 2024, so it is not used.
LK Samyang: No confirmed reason
LK Samyang (225190) rose 22.77% to 4,260 won. Trading value was 11.3 billion won and market cap was 60.0 billion won. The 2-day gain against the Sept 29 close of 3,730 won is 14.2%. The 5-day gain against the Sept 22 close of 821 won is 418.9%.
DART shows one filing, dated Sept 29: an officer and major shareholder report on holdings of specific securities. The filing's existence is confirmed, but its contents are not in the data, so it cannot be linked to this move. No news was collected for the past three days. No confirmed reason exists for the rise.
The price history is also unusual. The stock rose 29.99% on Aug 31, fell 16.22% on Sept 2, then stayed at 821 won through Sept 23. The Sept 28 close was 4,175 won, yet the daily change is listed as 1.71%. The data does not explain this. From Sept 28 to Sept 30, foreign investors were net sellers of 30,119 shares and individuals were net buyers of 30,806 shares. Oct 1 is not included.