HLB Biostep surged on the 30th, with the static volatility interruption mechanism (VI) triggered four times in a single day, drawing keen market attention.

■ Surges 21.90% in After-Hours Trading

As of 6 p.m. on the 30th, HLB Biostep (278650) traded at 6,400 won in the after-hours market, up 1,150 won (21.90%) from the reference price of 5,250 won.

The stock opened at 5,250 won, fell to as low as 4,900 won intraday, then spiked to 6,820 won, swinging sharply throughout the session. The gap between the intraday high and low reached 1,920 won. After the intraday peak of 6,820 won, the stock stood at 6,400 won as of 6 p.m., holding 420 won below the high.

■ Static VI Triggered Four Times in One Day

The Korea Exchange (KRX) confirmed multiple static VI triggers for HLB Biostep on the day, totaling four confirmed activations.

Specifically, the first static VI was triggered at 1:21:24 p.m. and lifted at 1:23:37 p.m. It was triggered again at 1:45:43 p.m. and lifted at 1:47:49 p.m. It was then triggered at 5:41:31 p.m. and lifted at 5:43:43 p.m., and triggered once more at 5:45:55 p.m. before being lifted at 5:48 p.m.

The static VI is a market stabilization mechanism activated when a stock price reaches a certain price movement threshold. Once triggered, trading shifts to a single-price auction method for a set period to ease abrupt price swings.

■ Cause of Surge Unconfirmed... Some FDA Mentions in Communities

HLB Biostep's 52-week high is 10,100 won and its low is 1,500 won. The day's intraday high of 6,820 won is 3,280 won below the 52-week high.

Amid the sharp price swings and repeated VI triggers, attention is focused on the stock's future direction. However, the specific cause of the day's surge has not been confirmed, and the VI triggers alone cannot be taken as evidence that a particular company's disclosures or business changes drove the price increase. In some online communities, the FDA is being cautiously mentioned.

[This article reflects market prices and VI activation records as of 6 p.m. on October 30, 2026. Investment decisions and responsibilities lie with the investor, and this article was written with partial AI assistance.]