2026-08-03 KOSDAQ Buy-Side Sidecar Triggered: 6% and 3% Thresholds and the Impact on Individual Orders
At 10:28:8 a.m. on 2026-08-03, a buy-side sidecar was triggered after KOSDAQ 150 futures rose 6.41% and the KOSDAQ 150 Index gained 3.13%. Not all stock trading was halted; only the effectiveness of program-trading buy orders was suspended for 5 minutes.
The verification time of 1:35 p.m. was before the market close. Closing prices, final investor-category trading flows, and the reasons for the rally may change by the end of the trading session.
What Happened on the KOSDAQ Today?
The KOSDAQ opened at 709.99, down 1.36% from the previous trading session, but reversed course and moved higher during intraday trading. By 10:34 a.m., the index had climbed to 746.86, representing a gain of 3.77% from the previous session.
Comparing the opening level of 709.99 with the index level of 746.86 at 10:34 a.m., the market rebounded by 36.87 points, or approximately 5.19%, during the session.
Author's calculation
Formula: `(746.86－709.99) ÷ 709.99 × 100`
Result: Approximately 5.19%
Comparison basis: Opening level on 2026-08-03 and the index at 10:34 a.m.
At the time the sidecar was triggered, KOSDAQ 150 futures and the spot index stood at the following levels.
| Category | Value at Activation | Change | Activation Threshold |
|---|---|---|---|
| KOSDAQ 150 futures | 1,257.30 | +75.80 points, +6.41% | At least +6% |
| KOSDAQ 150 Index | 1,252.72 | +38.12 points, +3.13% | At least +3% |
| Duration requirement | Both conditions met simultaneously | At least 1 minutes | At least 1 minutes |
| Activation measure | Program-trading buy orders | Effectiveness suspended for 5 minutes | Automatic release |
The futures gain exceeded its threshold by 0.41% percentage points, while the spot index gain exceeded its threshold by 0.13% percentage points.
What Are the Activation Criteria for a KOSDAQ Buy-Side Sidecar?
A KOSDAQ buy-side sidecar is triggered when both KOSDAQ 150 futures and the KOSDAQ 150 spot index rise beyond specified thresholds at the same time. Exceeding the threshold in only one market does not immediately trigger the mechanism.
There are three activation conditions.
1. The price of KOSDAQ 150 futures rises at least 6% above its reference price
2. The KOSDAQ 150 Index rises at least 3% above the previous trading day's closing level
3. Both conditions persist simultaneously for at least 1 minutes
When these conditions are met, the effectiveness of program-trading buy orders is suspended for 5 minutes. A sidecar in the same direction can be triggered once per day, with buy-side and sell-side sidecars treated separately.
The mechanism cannot be triggered during the first 5 minutes after the market opens or the final 40 minutes before it closes. Therefore, the normal activation window runs from 9:5 a.m. to 2:50 p.m.
Does a Sidecar Halt My Stock Orders?
Ordinary orders placed directly by individual investors through mobile trading systems (MTS) or home trading systems (HTS) can continue. A sidecar does not close the entire KOSDAQ market. It temporarily restricts the effectiveness of buy orders submitted through program trading.
The following types of transactions should therefore be distinguished.
Trading restricted for 5 minutes
Buy orders submitted through program trading
Execution participation by the affected program-trading buy orders
Trading that remains available
Ordinary purchases and sales of individual stocks
Maintenance of existing limit orders
Regular MTS and HTS orders that are not part of program trading
Not all orders placed by foreign or institutional investors are suspended. The determining factor is whether an order qualifies as program trading, not who submitted it.
However, while program orders are temporarily removed from the market, bid-ask spreads may widen and execution prices may change rapidly. Using market orders during periods of high volatility can result in buying at a higher price or selling at a lower price than expected.
Why Did the KOSDAQ Surge Today?
The immediate reason for the sidecar activation was that KOSDAQ 150 futures and the spot index met the prescribed upward-movement thresholds. The economic reasons behind the market rally must be distinguished from the regulatory conditions that triggered the sidecar.
Reports published that day cited bargain hunting following the recent sharp decline, the continuation of the KOSDAQ rebound, and profit-taking in large-cap KOSPI stocks accompanied by capital rotation as possible contributing factors.
Some market participants also suggested that measures related to single-stock leveraged ETFs may have reduced capital outflows from the KOSDAQ. However, this was an interpretation offered by market participants, not an officially confirmed cause.
It is difficult to explain the entire KOSDAQ rally through a single policy or catalyst. A more accurate assessment requires examining final investor-category trading flows and each sector's contribution to the index gain after the market closes.
Does a Buy-Side Sidecar Mean Stocks Will Continue Rising?
A buy-side sidecar is neither a recommendation to buy nor a signal that further gains are coming. It is a market-stabilization mechanism indicating that prices have moved rapidly over a short period.
After the sidecar is lifted, all three scenarios are possible.
The upward trend continues
The market gives back part of its gains
Selling pressure intensifies and the market reverses downward
In a market experiencing large day-to-day fluctuations, as seen recently, profit-taking may emerge the day after a sharp rally. Chasing rising prices solely because a sidecar was triggered can increase exposure to price volatility.
What Is the Difference Between a Sidecar and a Circuit Breaker?
A sidecar temporarily restricts program trading, while a circuit breaker is a stronger measure that halts trading across the entire market.
| Category | Buy-Side Sidecar | Circuit Breaker |
|---|---|---|
| Scope | Program-trading buy orders | All stock trading across the market |
| Market movement | Sharp rise or decline | Sharp decline |
| KOSDAQ criteria | Futures ±6%, spot index ±3% | Thresholds based on successive stages of index declines |
| Duration requirement | Both conditions persist for 1 minutes | Stage-specific decline thresholds are met |
| Trading restriction | Program orders restricted for 5 minutes | Temporary suspension of all trading |
| Ordinary orders | Permitted | Suspended |
| Purpose | Slow the pace of abrupt market movements | Protect the overall market from severe shocks |
If only an individual stock temporarily switches to single-price auction trading, the cause is more likely a volatility interruption (VI) rather than a sidecar.
What Investors Should Check After a Sidecar Is Triggered
The market's behavior after the sidecar is lifted matters more than the activation itself.
1. KOSDAQ 150 Futures Gains
Check whether the futures gain quickly falls below the activation threshold or remains elevated. Futures movements can influence program-trading flows and volatility in the spot market.
2. Net Program Buying
Check whether strong program buying resumes after the sidecar is lifted. Rather than looking only at the total net program-buying amount for the day, examine how it increases or decreases throughout the trading session.
3. Number of Advancing Stocks and Sector Distribution
Check whether the rally is concentrated in a few large-cap stocks or has spread across the broader KOSDAQ market. If the index rises while more stocks decline than advance, investors' experience of the market may differ from the headline index performance.
4. Trading Flows by Foreign, Institutional, and Individual Investors
Intraday trading flows change continuously. Investors who were net buyers in the morning may become net sellers in the afternoon, so final trading flows should be checked again after the market closes.
5. Risks of Market Orders
During periods of sharp price movements, the price displayed on the screen may differ from the actual execution price. If trading is necessary, investors may consider splitting orders into smaller quantities and using limit orders.
How Many Buy-Side Sidecars Have Been Triggered This Year?
Media reports differed in their counts of sidecar activations on 2026-08-03. Some outlets reported that this was the 15th KOSDAQ buy-side sidecar of the year, while others counted it as the 16th.
It is therefore advisable to verify the cumulative count again after the Korea Exchange updates its official activation records. Multiple reports confirmed the same activation time and contemporaneous futures and spot index figures, but the cumulative count cannot yet be treated as definitive.
Frequently Asked Questions
Can I Still Place Buy Orders for KOSDAQ Stocks?
Yes. Ordinary orders for individual stocks remain available. However, because program-trading flows are temporarily restricted during a period of rapid market movement, investors should check execution prices and bid-ask spreads.
Will Stock Prices Fall When a Sidecar Is Triggered?
A sidecar does not determine the direction of stock prices. The market may continue rising after the restriction is lifted, or it may give back some of its gains.
Is a Buy-Side Sidecar Good News for Investors?
It indicates strong buying pressure in the market, but it does not mean that an individual company's earnings or underlying value have improved. Investment decisions should separately consider corporate performance, trading flows, and market volatility.
When Is the Sidecar Automatically Lifted?
The effectiveness of program-trading buy orders is suspended for 5 minutes, after which the restriction is automatically lifted. Ordinary stock trading continues throughout that period.
Key Takeaways
The KOSDAQ buy-side sidecar on 2026-08-03 was triggered at 10:28:8 a.m. At activation, KOSDAQ 150 futures had risen 6.41% and the KOSDAQ 150 Index had gained 3.13%, simultaneously exceeding the 6% and 3% thresholds.
Only program-trading buy orders were restricted; not all stock trading was suspended. A buy-side sidecar does not guarantee further gains, so investors should examine final trading flows and sector contributions after the market closes.
This information was verified as of 1:35 p.m. on 2026-08-03 and does not constitute investment advice. Intraday index levels and trading flows can continue changing, and investors may lose their principal.
Sources and Fact-Checking References
According to reports citing the Korea Exchange, the activation occurred at 10:28:8 a.m. At that time, KOSDAQ 150 futures stood at 1,257.30, up 6.41%, while the KOSDAQ 150 Index stood at 1,252.72, up 3.13%. The effectiveness of program-trading buy orders was suspended for 5 minutes. Yonhap News Agency + 2 Money Today + 2
The KOSDAQ Index opened at 709.99 and reached 746.86 at 10:34 a.m. The increase of 36.87 points, or approximately 5.19%, from the opening level is the author's calculation based on those figures. Money Today
Information provided by financial institutions was cross-checked regarding sidecar activation windows, the availability of ordinary orders, the daily activation limit, and the differences between sidecars, circuit breakers, and volatility interruptions. KB's Insights
Reports cited profit-taking in large-cap KOSPI stocks and the continuation of the KOSDAQ rebound as background factors behind the day's market movements. The suggestion that leveraged ETF measures reduced capital outflows was presented as market speculation rather than a confirmed cause. Yonhap News Agency
The cumulative number of buy-side sidecar activations differed across reports, with some counting this as the 15th activation and others as the 16th. The News + 2 Money Today + 2
※ This article is provided for reference to help readers understand market movements and does not constitute a recommendation to invest in any particular stock or asset. All investment decisions and their consequences are the responsibility of the individual investor.