The Quick Answer

The rule limits how far a stock can move within one trading day. It does not permanently cap the stock’s value. A stock can move another 30% on the following trading day based on its newly established base price (기준가격).

What Do Sanghanga and Hahanga Mean?

Sanghanga (상한가)

The upper limit price allowed for a stock during the trading day. In Korean market commentary, the word may also describe a stock that has reached or closed at that price.

Hahanga (하한가)

The lower limit price allowed for a stock during the trading day. It may refer either to the price itself or to a stock trading at that price.

Korean financial news frequently uses these terms without an English translation. A headline such as ABC shares closed at sanghanga means that the stock finished the session at its upper daily price limit.

How Is Korea’s 30% Price Limit Calculated?

The calculation begins with the stock’s base price (기준가격). For a normally traded stock, this is generally based on the previous trading session’s closing price. Special situations may use an exchange-determined adjusted base price.

Investors could therefore submit ordinary stock orders only within the permitted range between KRW 7,000 and KRW 13,000 for that day.

What Happens When a Stock Reaches Sanghanga?

Reaching the upper limit does not automatically end trading. Transactions can still occur at the upper limit price (상한가) when both buyers and sellers are present.

The practical problem is that strong demand is often accompanied by very few sell orders. Thousands of investors may place buy orders at the same upper limit price while almost nobody is willing to sell.

In this example, only a small portion of the demand can be matched. Placing a buy order at the upper limit does not guarantee execution. Your order may remain in the queue until sellers appear, and it may never be filled before the market closes.

Sanghanga Is Not the Same as a Trading Halt

Foreign investors sometimes assume that a stock has been halted because its price has stopped rising. However, sanghanga (상한가) is a price boundary, not necessarily a suspension of trading.

A stock may trigger a volatility interruption (변동성완화장치) while moving toward the upper limit, but the two systems serve different purposes.

VI provides a short cooling-off and price-discovery period, while the daily price limit defines the maximum permitted range for the trading day.

Why Does Korea Use a Daily Price Limit?

The system is designed to contain extremely abrupt one-day price movements and provide market participants with more time to evaluate new information.

It can slow the immediate impact of panic selling, speculative buying, rumors, or a sudden imbalance between supply and demand. However, it does not remove investment risk or guarantee that the current price is reasonable.

Important Exception: A Korean IPO’s First Trading Day

The standard plus-or-minus 30% rule should not be applied blindly to every newly listed company.

For eligible newly listed stocks on the KOSPI and KOSDAQ markets, the first-day trading range is generally set between 60% and 400% of the IPO offering price . The offering price functions as the first-day reference price under the revised listing-day system.

This means a Korean IPO can gain as much as 300% from its offering price on its first trading day. Korean investors commonly refer to a first-day close at four times the offering price as ttattable (따따블).

After the first trading day, the ordinary daily price-limit framework generally applies using the next session’s base price.

Common Korean Limit-Up Slang

The following expressions are informal market slang rather than official Korea Exchange classifications.

What Should a Foreign Investor Check?

1. Identify the base price (기준가격).

   Do not assume that every percentage shown by a news article is measured from your purchase price. The daily limit is determined from the exchange’s base price.

2. Check whether it is an IPO’s first trading day.

   A newly listed KOSPI or KOSDAQ stock may use the special 60%–400% first-day range instead of the ordinary ±30% band.

3. Examine actual executed volume (거래량).

   A stock may display a large gain even though only a small number of shares traded at the limit price.

4. Compare buy and sell queues.

   A large buy queue with almost no sell volume explains why an order may remain unfilled, but order-book quantities can be cancelled or changed.

5. Find the original catalyst (상승 재료).

   Review company disclosures, earnings releases, contracts, regulatory decisions, and other primary information instead of relying only on the price move.

6. Do not treat the price limit as downside protection.

   The rule limits one day’s movement. A stock can continue falling on subsequent trading days as each new daily range is established.

Frequently Asked Questions