What it is
Newly listed Korean stocks can open and trade between 60% and 400% of the offer price on day one. The range has applied since June 26, 2023, and the chance of a fourfold first-day rise popularized the slang "ttattable" (quadruple). From the second day the normal ±30% daily limit applies.
Example
A stock offered at KRW 10,000 can trade as low as KRW 6,000 or as high as KRW 40,000 on its first day. Hitting KRW 40,000 is called "ttattable"; doubling to KRW 20,000 is "ttable".
What to keep in mind
The wide first-day range means sharp swings, and strong book-building or subscription demand does not guarantee gains after listing. Investors also watch when lock-up commitments expire, since shares can come to market then.
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This explanation is general information, not investment advice. Rules reflect September 2026 and may change; check official exchange and broker notices.