Key Takeaways
- How to Read Korea’s Trading Halts and Circuit Breakers covers four automatic, price-triggered mechanisms that pause a stock or the whole market. There’s a fifth layer, and it isn’t automatic. It’s discretionary and status-triggered. The exchange designates a stock into a watch category, and that status governs what happens next—not a single day’s price move.
- A disclosure failure has its own escalation ladder. A single serious violation can mean an immediate one-day halt. Cumulative penalty points matter too: since July 1, 2026, 10 or more points within a trailing year—on either KOSPI or KOSDAQ—open the door to a review that can end in delisting. A single sufficiently serious, intentional violation can trigger that same review on its own, regardless of accumulated points.
- The three-tier market alert system doesn’t clear itself. A stock designated investment-risk holds that status for a minimum of 10 trading days and de-escalates one tier at a time, not straight back to normal. One related reform has already landed and one hasn’t: the top 100 companies by market capitalization are now excluded from warning designation entirely, while a separate proposal to drop the 100%-cash-margin rule for warning and risk stocks remains unconfirmed.
- “Administrative issue” status is a condition, not a one-day event. The KRX guide assigns it a one-day trading halt on designation. But the status itself persists: no credit trading, no using the stock in place of cash as margin collateral, and 100% cash margin required on every buy.
- This is the deep version of the fifth mechanism, the pillar names and defers. How Korea’s Trading Day Works covers the automatic four; How to Read Korea’s Trading Halts and Circuit Breakers details them. This piece covers what neither does—the layer that responds to what a company is, not what its price did today.
Contents
- Automatic versus discretionary
- Disclosure-driven halts and the unfaithful-disclosure ladder
- The three-tier market alert system
- Administrative issue: a status, not a day
- Short-term overheating: forced call-auction trading
- When it ends in delisting
- Four traps investors keep falling into
- FAQ
1. Automatic versus discretionary
How to Read Korea’s Trading Halts and Circuit Breakers walks through the price limit, the volatility interruption, the sidecar, and the market-wide circuit breaker. Four mechanisms, one shared property: they trigger automatically on a price or index move, and they apply to any stock that hits the threshold. The companion pillar, How Korea’s Trading Day Works, names a fifth category and defers it—a layer that isn’t automatic and doesn’t care what the price did in the last minute.
This piece is that fifth layer. Every mechanism here starts with a designation. That’s a decision by the exchange or a status a company falls into through its own disclosure record, market capitalization, or trading pattern. The designation is what triggers the consequence, not the day’s price action. A stock can sit at an unchanged price and still be halted, restricted, or delisted—because of what it is at that moment, not what it did.
That’s what matters for how long the consequence lasts. The four automatic brakes resolve in minutes. The mechanisms in this piece resolve in trading days. Some don’t resolve at all until an underlying condition is cured—a filing gets made, a market cap recovers, and a remediation plan is approved.
2. Disclosure-driven halts and the unfaithful-disclosure ladder
Korea’s exchange guide lists specific disclosure-related suspension triggers, each with its own duration. Disclosing material information halts the stock for 30 minutes from the disclosure. If a surge in trading volume driven by rumor or news looks likely, the exchange can request a disclosure and halt the stock for 30 minutes, from the request until the response. If the company misses the deadline to respond, the suspension runs open-ended and differently by market. On KOSPI, it runs from the missed deadline until the disclosure is finally made. On KOSDAQ, it runs until 30 minutes after that.
Repeated or serious disclosure failures escalate into something with a name: unfaithful disclosure corporation designation. Each violation carries its own penalty-point value, assigned at that designation event. If the points assigned for that single event reach 8 or more on KOSDAQ or 10 or more on KOSPI, the stock is also halted for the designation day itself—a per-event threshold, not a running tally.
The running tally matters one rung up. Since a reform effective July 1, 2026, a company whose disclosure penalty points reach 10 or more within a trailing year—on either KOSPI or KOSDAQ—becomes eligible for administrative issue designation. It also opens the door to a listing-eligibility substantive review, the process covered in §6. That trailing threshold used to be 15 points. The July 2026 reform lowered it to 10 and converted previously accumulated points at two-thirds value.
The same reform added a one-strike rule. A single sufficiently serious and intentional disclosure violation can now trigger a substantive review on its own, regardless of accumulated points. An ordinary late filing doesn’t do that. A serious, intentional one can—on its own, since July 2026. The point ladder is what catches everything short of that.
3. The three-tier market alert system
Separate from the disclosure ladder, Korea runs a three-tier price-behavior alert system: investment-attention (tuja-juui jongmok), investment-warning (tuja-gyeonggo jongmok), and investment-risk (tuja-wiheom jongmok) issues. The first tier catches a cluster of trading patterns: concentration in a small number of branches or accounts, sharp closing-price swings, a large volume of unfilled buy orders resting at the daily price limit, or one account driving an outsized share of trading. The second and third tiers track the same underlying pattern at rising severity. A stock whose price has risen abnormally fast over a defined recent window earns a warning. A warning stock whose price keeps rising abnormally fast — including after a previous warning was lifted—escalates to investment risk.
None of this clears on its own. An investment-risk designation holds for a minimum of 10 trading days. After that floor, the exchange checks the stock against a multi-part price test. Broadly: has it kept posting a large gain over a roughly one-week window? A large gain over a roughly three-week window? Has it printed a fresh closing high? The designation lifts only once; none of those still holds. The exact percentage thresholds differ depending on which route triggered the original designation. This piece states the shape of the test, not a single number that wouldn’t apply uniformly.
Clearing the risk tier doesn’t return a stock to normal in one step, either. It drops one tier to investment-warning. The stock then has to separately clear a warning-tier condition before it trades normally again.
Warning and risk designation have historically carried two consequences. 100% cash margin is required on any buy order—no unsettled or margin-financed purchases. And credit trading is restricted or barred outright. A third consequence takes effect September 14, 2026: a warning or risk stock is shut out of the exchange’s new after-market session, which trades from 4:00 p.m. to 8:00 p.m. Two related reforms have moved on different timelines since. The first has already taken effect. The top 100 companies by combined KOSPI and KOSDAQ market capitalization are now excluded from the investment-warning designation and from its pre-designation notice altogether. A narrower version of this exclusion took effect in December 2025; it was broadened to its current, fuller form in 2026.
The second hasn’t been confirmed as finalized. A proposal, first disclosed in April 2026, would remove warning and risk stocks from the mandatory 100%-margin requirement. As of August 15, 2026, the most recent sourcing available still described this as an intention rather than a completed rule change. KRX’s own market-alert pages, current as of that date, still describe the 100% requirement as standing. Both reforms trace to the same episode: a major chipmaker’s investment-warning designation in December 2025, which drew criticism that the rules were too blunt for a large, liquid stock. Treat the 100%-margin consequence as the operating baseline for any warning or risk stock outside the top 100, and check current KRX rules before assuming otherwise.
4. Administrative issue: a status, not a day
“Designation of administrative issues” triggers a one-day trading halt, per the exchange’s own guide. But that one day isn’t the important part. Administrative-issue status is a condition that persists. The stock is barred from credit trading, can’t be posted in place of cash as margin collateral, and requires 100% cash margin on every buy order for as long as the designation holds. From September 14, 2026, it is also excluded from the exchange’s new after-market session, which trades from 4:00 p.m. to 8:00 p.m. The same exclusion applies to investment-warning and investment-risk stocks. A trader who checks only for a trading halt and sees none on a given day can still be holding a stock under every one of these restrictions.
One common route into the designation: market capitalization falling and staying below a listing threshold. Cross that line, and stay below it for 30 consecutive trading days, and the company is designated. Since a reform effective July 1, 2026, it then has a further 90 trading days to recover. It must post 45 consecutive trading days above the threshold within that window or face delisting—a tighter test than the pre-reform rule.
The threshold itself is being raised in stages, and the schedule has already slipped once. KOSPI’s market-cap bar moved from 20 billion won to 30 billion won on July 1, 2026, and rose again to 50 billion won on July 1, 2027. KOSDAQ moved from 15 billion won to 20 billion won on July 1, 2026, rising to 30 billion won on July 1, 2027. Both second steps were originally set for January 1, 2027. A government market-review meeting on September 4, 2026, pushed them back six months, citing market conditions. A separate, newer route arrived in the July 2026 reform: a closing price held below 1,000 won for 30 consecutive trading days now triggers the same designation and recovery test. It’s a rule that produced a wave of new designations in the months after it took effect.
5. Short-term overheating: forced call-auction trading
A separate, narrower mechanism targets a stock moving too fast in too short a window, independent of the market-alert ladder above. Three criteria, all measured against a trailing 40-trading-day baseline, have to be met on the same day. The closing price is 130% or more of the 40-day average close. The average daily trading-turnover ratio over the most recent two days is 600% or more of the 40-day average. And average daily price volatility over that same two-day window is 150% or more of the 40-day average. A separate, independent route covers a preferred share whose price diverges more than 50% from its associated common share.
Meet the criteria within 10 trading days of a pre-designation notice—on a day the stock also closes above both the prior day and the day before the notice—and the stock is designated short-term overheated. The consequence is mechanical, not punitive. For 3 trading days, continuous order-by-order trading in the regular session stops. The stock trades only through a single-price call auction roughly every 30 minutes during that session. If the stock closes 20% or more above its pre-designation price on that third day, the designation extends once, for another 3 trading days—up to 6 trading days total of forced call-auction trading—for a stock that keeps running.
6. When it ends in delisting
The most serious cases route through a listing-eligibility substantive review—triggered by the disclosure-penalty threshold in §2 or by capital impairment measured on a half-year basis. (A full-year capital impairment is a separate, bright-line delisting cause instead—that’s not a substantive-review trigger, and neither is the market-capitalization shortfall in §4, which resolves through its own mechanical 90-day test rather than through review.) Under a reform effective April 1, 2026, applying to both KOSPI and KOSDAQ, the maximum period a company under review gets to submit and execute a remediation plan was cut from eighteen months to twelve. Where a company hits both a formal, bright-line delisting cause and a substantive-review cause at the same time, the exchange now runs both reviews in parallel rather than one after the other. It delists on whichever concludes first—a procedural streamlining, not a change to the underlying standards.
Once delisting is confirmed, the stock doesn’t disappear immediately. It’s traded for 7 trading days of final clean-up trading (jeongni maemae)—itself conducted through the same style of single-price call auction described in §5, with no daily price-limit band—a last, mechanical window for remaining holders to sell before the listing is removed.
One narrow exception now exists. Under a change announced September 4, 2026, some companies can skip clean-up trading and move straight to the KONEX market at their existing price. It applies where administrative-issue status came through the market-capitalization route after July 1, 2026. The company must also not be capital-impaired and must have posted an operating profit in two of the last three years—or in one of the last three years while holding at least 20 billion won in equity.
7. Four traps investors keep falling into
Trap 1: Checking only for a trading halt and missing a status. Administrative-issue and market-alert designations impose ongoing restrictions—no credit, no use as margin collateral, 100% cash margin—that outlast the one-day halt attached to the designation event. A stock can trade through the regular session with no halt in sight while still carrying every one of these restrictions—and, from September 14, 2026, while being locked out of the after-market session entirely.
Trap 2: Assuming a warning or risk designation lifts automatically after a fixed period. It doesn’t. An investment-risk designation holds for a minimum of 10 trading days, then depends on the stock’s own subsequent price behavior clearing a multi-part test. Even then, it de-escalates one tier at a time, not straight to normal.
Trap 3: Assuming short-term overheating always resolves in exactly 3 trading days. It’s the default, but a stock that closes 20% or more above its pre-designation price on that third day gets another 3 trading days added, up to 6 total. The mechanism is a response to a specific pattern—fast price rise, high turnover, high volatility—not a punishment, and not the same mechanism as an unfaithful-disclosure designation.
Trap 4: Assuming every proposed reform to the market-alert system either happened or didn’t, as a package. It’s neither. The top-100 market-cap exemption from warning designation is a live rule, already in effect. The proposal to drop the 100%-margin requirement for warning and risk stocks isn’t—as of August 15, 2026, it remained unconfirmed. A trader who assumes both moved together, in either direction, will be wrong about one of them.
8. FAQ
What’s the difference between this and the four mechanisms in “How to Read Korea’s Trading Halts and Circuit Breakers”?
Those four trigger automatically on a price or index move and resolve in minutes. The mechanisms here are discretionary or status-based. They depend on a company’s disclosure record, market capitalization, or a sustained trading pattern, and they resolve in trading days—or only once an underlying condition is cured.
How many disclosure penalty points does it take to get a stock suspended?
A single violation whose assigned points reach 8 (KOSDAQ) or 10 (KOSPI) triggers an immediate one-day halt on designation as an unfaithful-disclosure corporation. Separately, cumulative points across a trailing year matter: since July 1, 2026, 10 or more on either market opens the door to administrative-issue designation and a substantive listing review—and a single sufficiently serious, intentional violation can trigger that review on its own.
Does an investment-warning or investment-risk designation stop me from trading the stock?
No—it restricts how you pay for it, for any stock outside the top 100 by market capitalization (which is now excluded from warning designation entirely). The standing rule requires a 100% cash margin, no margin-financed or unsettled purchases, and restricts credit trading. A proposal to ease this further was under consideration as of August 2026, unconfirmed as finalized.
What happens during a short-term overheating designation?
Continuous trading stops for 3 trading days, extendable once to 6 if the stock keeps rising. The stock trades only through a single-price call auction roughly every 30 minutes during the regular session, rather than continuously as orders arrive.
How does this connect to the rest of the site?
This is the fifth mechanism the pillar, How Korea’s Trading Day Works, names and sets aside. How to Read Korea’s Trading Halts and Circuit Breakers covers the four automatic, price-triggered mechanisms this piece deliberately doesn’t re-derive.
Last updated: September 9, 2026
This article is for informational purposes only and does not constitute investment, tax, or legal advice. It describes general trading-suspension, disclosure-penalty, and delisting-review mechanisms on the Korea Exchange and is not a recommendation about any security. Designation criteria, penalty-point thresholds, margin requirements, and delisting standards can and do change. Several changes are in motion as of September 2026. A new after-market session opens on September 14, 2026, with warning, risk, and administrative-issue stocks excluded. The market-capitalization delisting threshold takes its next step up on July 1, 2027, delayed from January 1. And a separate reform easing the 100%-margin requirement for warning and risk stocks remained unconfirmed as of August 15, 2026. Verify current KRX rules before relying on any of this.