Korean Stock Market Hours: A Guide for Global Investors

What time does the Korean stock market open?

The simple answer used to be:

9:00 a.m. to 3:30 p.m. Korea Standard Time.

That is still the regular trading session of the Korea Exchange.

But it is no longer the complete answer.

Since the launch of Nextrade, or NXT, in 2025, eligible Korean stocks can also trade before and after the traditional KRX session.

For some stocks, trading can now begin at 8:00 a.m. and continue until 8:00 p.m. KST.

That distinction matters for global investors because Korea no longer operates as a purely single-venue equity market. KRX remains the core exchange, while NXT operates as an alternative trading system for eligible KRX-listed securities.

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30-Second Answer

The regular Korea Exchange session is:

09:00–15:30 KST

for both the KOSPI and KOSDAQ markets.

However, eligible stocks can also trade on Nextrade (NXT) through three sessions:

Pre-market: 08:00–08:50
Main market: 09:00:30–15:20
After-market: 15:40–20:00

So the modern Korean market is better understood as:

KRX regular market + KRX off-hours trading + NXT extended trading

rather than simply:

9:00–15:30 only.

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3 Key Facts

1. KRX regular trading runs from 09:00 to 15:30 KST.

This is still the most important session for Korean equities and where the official KRX opening and closing prices are formed.

2. NXT extends potential trading to 08:00–20:00.

Only eligible securities can trade on Nextrade, and NXT has distinct pre-market, main-market and after-market sessions.

3. KOSPI and KOSDAQ are markets — not separate trading hours.

Both operate within the Korea Exchange structure and share the same standard KRX regular-session hours.

If you are new to the distinction, read KMI's guide:

KOSPI vs KOSDAQ: What Is the Difference?

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Korean Stock Market Hours at a Glance

KRX

Session	Trading Hours, KST
Regular Session	09:00–15:30
Pre-hours trading	Before regular session
Post-hours trading	Through 18:00,             depending on transaction type

KRX also provides specific off-hours mechanisms, including closing-price trading and other transaction types outside the main session.

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Nextrade — NXT

NXT Session	Trading Hours, KST
Pre-market	08:00–08:50
Main market	09:00:30–15:20
After-market	15:40–20:00

NXT's official system currently describes its regular market as a 12-hour trading framework running from 08:00 to 20:00.

But there is an important qualification:

Not every Korean stock necessarily trades on NXT.

Investors must verify whether the security is included in NXT's eligible universe.

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What Time Does the KOSPI Open?

The KRX KOSPI regular session opens at:

09:00 Korea Standard Time

and closes at:

15:30 Korea Standard Time.

KRX begins receiving regular-session quotations before the official opening, but continuous regular trading begins at 09:00.

For most investors asking:

What time does the KOSPI open?

the practical answer remains:

9:00 a.m. KST.

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What Time Does the KOSDAQ Open?

The KOSDAQ regular session also runs:

09:00–15:30 KST.

There is no separate standard KOSDAQ schedule.

KOSPI and KOSDAQ differ in:

• listed companies
• market characteristics
• sector exposure
• investor composition

but not in their standard KRX regular-session hours.

For a complete explanation of those differences:

Read: KOSPI vs KOSDAQ — What Is the Difference?

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What Is Korea Standard Time?

South Korea uses:

Korea Standard Time — KST

which is:

UTC+9

South Korea does not currently observe daylight saving time.

This makes Korean trading hours fixed in local time throughout the year.

However, the equivalent trading time for investors in countries such as the United States or United Kingdom does change because those countries use daylight saving time.

That distinction causes considerable confusion.

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Korean Stock Market Hours in New York

For investors in New York, KRX trading occurs largely overnight.

During U.S. Daylight Saving Time — EDT

KRX regular session:

8:00 p.m. previous day → 2:30 a.m.

approximately, New York time.

During U.S. Standard Time — EST

KRX regular session:

7:00 p.m. previous day → 1:30 a.m.

approximately.

So when a U.S. investor wakes up in New York, Korea's regular market session has usually already closed.

This matters when interpreting:

• U.S. semiconductor moves
• Nvidia earnings
• Federal Reserve decisions
• U.S. Treasury yields
• geopolitical events

because Korea may react to U.S. developments during its next trading session rather than simultaneously.

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Korean Stock Market Hours in London

For London investors:

When London is on GMT

KRX:

00:00–06:30

When London is on British Summer Time

KRX:

01:00–07:30

The exact local conversion therefore depends on daylight saving time in the United Kingdom.

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Korean Stock Market Hours in Asia

The time difference is much simpler for Asian investors.

City	KRX Regular Session
Seoul	09:00–15:30
Tokyo	09:00–15:30
Singapore	08:00–14:30
Hong Kong	08:00–14:30

Tokyo and Seoul share the same UTC+9 time zone.

Singapore and Hong Kong are one hour behind Korea.

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Why NXT Changed the Answer

Before 2025, explaining Korean stock-market hours was relatively straightforward.

The Korea Exchange dominated Korean equity trading.

That changed with the introduction of Nextrade.

NXT describes itself as Korea's first alternative trading system and the second stock-trading venue alongside KRX.

This creates an important distinction.

KOSPI and KOSDAQ

tell you:

which Korean market a company belongs to

while:

KRX and NXT

can tell you:

where an eligible security is traded.

If this structure is unfamiliar, start with:

What Is the Korean Stock Market? A Guide for Global Investors

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How NXT Trading Hours Work

Nextrade divides its regular trading system into three major sessions.

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1. NXT Pre-Market

08:00–08:50 KST

This begins one hour before the traditional 09:00 KRX opening.

Eligible stocks can therefore begin forming prices before KRX's regular session.

This can be especially interesting after major overnight developments such as:

• U.S. earnings
• Nvidia results
• Micron earnings
• Federal Reserve announcements
• geopolitical events
• major company disclosures

But investors should be cautious.

Price discovery during extended trading can differ from the main market because liquidity and participation may be different.

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2. NXT Main Market

09:00:30–15:20 KST

NXT's main session overlaps most of the KRX regular session.

Notice the slight difference:

KRX begins regular trading at:

09:00

while NXT's main market begins at:

09:00:30

Similarly:

KRX closes at:

15:30

while NXT's main session ends at:

15:20.

The structure is designed so that KRX remains responsible for important official price-formation periods around the opening and closing auctions.

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3. NXT After-Market

NXT's after-market trading occurs from:

15:40–20:00 KST

with order acceptance beginning earlier in the post-close process.

This extends trading several hours beyond the KRX regular close.

For investors, it means:

15:30 is no longer necessarily the end of Korean stock trading for an eligible security.

That is one of the biggest changes to Korean market structure in decades.

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Does NXT Set the Official KRX Closing Price?

No.

This distinction matters.

The KRX closing process still plays a central role in determining the official exchange closing price.

NXT even suspends or structures certain trading periods around KRX's opening and closing price-formation processes.

So investors should not interpret:

a stock moved after 15:30 on NXT

as meaning:

the official KRX closing price changed.

The timestamps and trading venue matter.

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Why the Closing Price Matters

Many financial headlines say:

Samsung Electronics closed up 3%.

That usually refers to the official KRX close.

But the same stock may subsequently move during extended trading on NXT.

That creates two different questions:

What was the official KRX closing price?

and

Where is the stock trading now?

Those are not always the same answer.

This becomes particularly important for:

• market recaps
• ETFs
• index calculations
• portfolio valuation
• media headlines
• technical analysis

Always check the venue and timestamp.

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KRX Also Has Off-Hours Trading

NXT is not the only mechanism for trading outside 09:00–15:30.

KRX itself provides off-hours sessions.

According to current KRX information, these include mechanisms such as:

Pre-hours closing-price trading

A short session before the regular market.

Post-hours closing-price trading

Trading after the close using the closing price.

Single-price after-hours trading

Available into the evening.

Block and basket trading

Separate transaction mechanisms for qualifying trades.

KRX's post-hours framework can extend through 18:00, depending on the transaction type.

This means the phrase:

Korea closes at 3:30 p.m.

really means:

The standard KRX regular session closes at 3:30 p.m.

It does not mean all possible trading activity ends at that moment.

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What Happens at 9:00 a.m.?

The opening price is particularly important.

Before continuous trading begins, buy and sell orders accumulate.

The market needs to determine a price that balances available supply and demand.

This means the opening price can differ substantially from the previous day's close after major overnight news.

For example:

Previous Samsung Electronics close:

100

Major positive U.S. semiconductor news occurs overnight.

Large buy orders accumulate before Korea opens.

Samsung might open at:

105

rather than gradually trading:

100 → 101 → 102 → 103 → 104 → 105.

That difference is called a gap.

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Why Korean Stocks Often Gap After U.S. Trading

The time-zone difference creates an important structural feature.

Much of the U.S. market trades while Korea's traditional KRX session is closed.

During that period, investors can receive information including:

• Nvidia earnings
• Micron earnings
• U.S. CPI
• employment data
• Federal Reserve decisions
• Treasury-yield moves
• Nasdaq semiconductor moves

When Korea opens the following morning, much of that information can be priced in immediately.

That is why Korean stocks can open sharply higher or lower without a gradual overnight move in the regular KRX market.

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A Semiconductor Example

Suppose Nvidia reports earnings after the U.S. market closes.

Investors interpret the results as positive for AI infrastructure spending.

During the next Korean session, expectations could change for:

• SK hynix
• Samsung Electronics
• HBM demand
• memory suppliers
• semiconductor equipment companies

But the correct analytical chain is not:

Nvidia rose → Korean semiconductors must rise.

It is:

Nvidia results
→ AI spending implications
→ memory-demand expectations
→ company-specific exposure
→ Korean price reaction

For investors who want the technology background:

What Is HBM? The Investor Guide to AI Memory

and:

What Is DRAM? The Investor Guide to Memory, HBM and the Chip Cycle

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When Is the Korean Market Most Active?

There is no universal rule, but several periods deserve particular attention.

The Open

09:00 KST

Overnight information enters the KRX market.

Potential characteristics:

• gaps
• high volume
• rapid price discovery
• reaction to U.S. markets

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Early Session

The first hour can reveal whether the opening move is:

• being confirmed
• fading
• broadening
• reversing

For KMI analysis, this is where overnight narrative begins meeting actual Korean market positioning.

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The Closing Period

The final part of the session can be important because of:

• institutional rebalancing
• index activity
• closing-price formation
• foreign flows
• ETF-related activity

A stock's intraday high is not necessarily its most informative price.

The close can often carry greater importance for portfolio and index calculations.

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When Are Foreign Investor Flow Data Most Useful?

Intraday investor-flow estimates can be useful.

But they should not automatically be treated as final.

For example:

Foreigners are net buyers at 10:30 a.m.

does not guarantee:

Foreigners will finish the day as net buyers.

Positioning can change significantly through the close.

This matters especially in Korean large-cap stocks where foreign institutional participation can be substantial.

A more useful framework is:

Intraday Flow → Closing Flow → Multi-Day Cumulative Flow

rather than reacting to a single early number.

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What Days Is the Korean Stock Market Open?

KRX normally trades:

Monday through Friday

and closes on designated exchange holidays.

KRX identifies closures including:

• Saturdays
• public holidays
• Labor Day on May 1
• the final exchange day around year-end under its rules
• other dates designated by the exchange when necessary.

The exact holiday calendar can change each year.

For that reason, global investors should verify the current KRX calendar rather than relying on an old list.

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Is the Korean Market Open on U.S. Holidays?

Possibly.

A U.S. market holiday does not automatically mean the Korean market is closed.

For example, a U.S. holiday may leave:

• NYSE closed
• Nasdaq closed

while:

• KRX remains open.

The reverse can also happen.

A Korean public holiday may close KRX while U.S. markets remain open.

Therefore:

NYSE holiday ≠ KRX holiday

and:

KRX holiday ≠ NYSE holiday.

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Does Korea Use Daylight Saving Time?

No.

Korea Standard Time remains UTC+9 throughout the year.

But this does not mean the Korean market always opens at the same local time for U.S. or European investors.

New York and London move their clocks seasonally.

Korea does not.

Therefore, the local equivalent of 09:00 KST shifts by one hour when those markets enter or leave daylight saving time.

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KRX vs NXT: Which Price Should Investors Watch?

During the overlapping session, eligible securities can trade across multiple venues.

The answer depends on what you are trying to measure.

For the official Korean exchange close

KRX remains essential.

For current executable prices in eligible stocks

NXT may also matter.

For index interpretation

Use the relevant official index methodology and KRX reference points.

For execution

Your brokerage and its best-execution framework can influence where eligible orders are routed.

NXT states that brokerages use best-execution standards when selecting between KRX and NXT for eligible transactions.

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What Global Investors Should Check Before Trading

Before placing a Korean equity order, verify five things.

1. Is KRX open?

Check Korean holidays and special exchange notices.

2. Is the security eligible for NXT?

Do not assume every Korean stock trades there.

3. Which session are you trading?

Pre-market?

KRX regular market?

NXT main market?

After-market?

4. How liquid is the market?

Extended hours can behave differently from the main session.

5. Which price are you looking at?

Check:

• venue
• timestamp
• delayed vs real-time data
• KRX close
• current NXT price

A number without a timestamp and venue can be misleading.

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What Trading Hours Do NOT Tell You

Knowing market hours is necessary.

It does not tell you whether a trade is attractive.

A strong pre-market move does not guarantee a strong close.

Liquidity and positioning can change.

A gap higher does not prove fundamentals improved.

Price reaction and evidence are different.

Heavy early foreign buying does not guarantee foreign investors will finish as net buyers.

Flows change intraday.

An NXT after-market price is not automatically the official KRX closing price.

Venue matters.

Longer trading hours do not necessarily mean more useful price discovery at every moment.

Volume and liquidity matter as much as access.

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The KMI Market-Hours Framework

For a global investor following Korea, think of the day in four stages:

Overnight Global Information

↓

NXT Pre-Market

↓

KRX Regular Session + NXT Main Market

↓

NXT After-Market

The analytical question changes at each stage.

Before the open

What happened globally?

At the open

How is Korea pricing that information?

During regular trading

Who is buying and selling?

At the close

Was the move confirmed?

After the close

Did extended trading materially change sentiment?

This is much more useful than looking at one stock-price number in isolation.

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FAQ

What time does the Korean stock market open?

The regular Korea Exchange session opens at 09:00 KST.

Eligible stocks on Nextrade can begin trading from 08:00 KST.

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What time does KOSPI close?

The regular KRX KOSPI session closes at:

15:30 KST.

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What time does KOSDAQ close?

KOSDAQ's regular KRX session also closes at:

15:30 KST.

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Can Korean stocks trade after 3:30 p.m.?

Yes.

KRX has off-hours transaction mechanisms, and eligible stocks can trade through NXT's after-market until 20:00 KST.

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What is NXT?

NXT, or Nextrade, is South Korea's first alternative trading system.

It operates alongside the Korea Exchange and provides extended trading for eligible KRX-listed stocks.

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Is Nextrade the same as KOSDAQ?

No.

KOSDAQ is a listing market.

Nextrade is a trading venue.

They describe different parts of Korean market structure.

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Are KOSPI and KOSDAQ open at the same time?

Yes.

Their standard KRX regular sessions both run:

09:00–15:30 KST.

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Is the Korean stock market open on weekends?

No.

The normal KRX trading week runs Monday through Friday, excluding applicable exchange holidays.

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Does Korea have daylight saving time?

No.

Korea remains on KST, UTC+9, throughout the year.

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What time does KOSPI open in New York?

Approximately:

8:00 p.m. the previous day during EDT

or:

7:00 p.m. the previous day during EST.

Because the United States observes daylight saving time and Korea does not, the conversion changes seasonally.

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Related KMI Guides

Start Here

What Is the Korean Stock Market? A Guide for Global Investors

Understand KRX, KOSPI, KOSDAQ, NXT, foreign investors and the structure of the Korean market.

Market Structure

KOSPI vs KOSDAQ: What Is the Difference?

Understand the difference between Korea's main market and growth market.

Semiconductor Guides

What Is HBM? The Investor Guide to AI Memory

What Is DRAM? The Investor Guide to Memory, HBM and the Chip Cycle

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Coming Next

Can Foreigners Buy Korean Stocks? A Guide for Global Investors

After understanding where and when Korean stocks trade, the next logical question is:

How can an overseas investor actually access them?

That will be Guide #4.

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Bottom Line

The Korean stock market no longer fits neatly into one sentence.

The traditional answer remains:

KRX Regular Session = 09:00–15:30 KST

But the modern answer is broader.

Eligible stocks can also trade on Nextrade:

08:00–20:00 KST

through pre-market, main-market and after-market sessions.

For global investors, three distinctions matter:

KOSPI/KOSDAQ = listing markets

KRX/NXT = trading venues

Official close/current price = not always the same thing

The practical framework is therefore:

Check the market → check the venue → check the session → check the timestamp.

Only then interpret the price.

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Primary Sources

KMI prioritizes primary-source information for Korean market structure.

Key references for this guide:

• Korea Exchange — equity trading hours and settlement rules
• Korea Exchange — off-hours trading framework
• Nextrade — Market Overview
• Nextrade — Trading System
• Nextrade — Eligible Securities and market information

KRX confirms its standard regular equity session at 09:00–15:30 KST and T+2 equity settlement. Nextrade's official rules show pre-market at 08:00–08:50, main-market at 09:00:30–15:20, and after-market trading at 15:40–20:00.

Last Updated: August 28, 2026

Korea Market Insight

Evidence Before Narrative

This article is for informational and educational purposes only and does not constitute investment advice.