What Is a DSE Circuit Breaker? Upper and Lower Price Limits Explained

What is a circuit breaker on the DSE?

A circuit breaker is a daily price-control mechanism that limits how far a listed security can move upward or downward during a trading session. On the Dhaka Stock Exchange (DSE), the purpose is to reduce extreme single-day volatility and provide a basic market-protection boundary while buyers and sellers discover a price.

A circuit breaker does not guarantee that a share is safe, fairly valued, or profitable. It only limits the permitted price movement for a session under the rules in force at that time.

How upper and lower price limits work

Each security can have an upper limit and a lower limit calculated from the relevant reference or closing price under the exchange rules.

• The upper limit is the highest price at which the security may trade during that session.

• The lower limit is the lowest price at which the security may trade during that session.

• Orders outside the permitted band should not be executable under the applicable exchange controls.

Simple illustration

Imagine that a share has a reference price of Tk 100 and the applicable daily movement limit is 10%.

• Illustrative upper limit: Tk 110

• Illustrative lower limit: Tk 90

This is an example only. The actual limit depends on the rule set, the security, its price band, market category, exchange notices, and any temporary regulatory measures in force.

Why circuit breakers matter

Circuit breakers can help reduce sudden price jumps or falls within one session, but they do not remove investment risk. A share can reach its upper or lower limit on multiple days, and the underlying business, liquidity, disclosures, corporate actions, and market sentiment can still materially affect its price.

For learners, the most important lesson is this: a price limit is a trading rule, not a signal to buy or sell.

What investors should check before placing an order

Before making a real investment decision, check the following:

1. The current official DSE market data and permitted price range for the security.

2. Recent company disclosures, financial statements, price-sensitive information, and corporate announcements.

3. The security category and the relevant trading or settlement conditions.

4. Your broker's displayed order screen and any applicable warnings.

5. Whether an exchange or regulatory notice has changed the normal market parameters.

Circuit breakers and StockSimulatorBD

StockSimulatorBD is designed for educational paper trading. A realistic simulator should apply the applicable daily price boundary before allowing a simulated order to execute. It should also make clear whether its prices are simulated, delayed, end-of-day, or sourced from another market-data method.

Practising with virtual money can help users understand order prices, portfolio effects, and price-limit concepts before making real financial decisions.

Important limitations

Circuit-breaker rules may be revised by the exchange or regulator. In 2026, reporting indicated that the authority to determine certain trading parameters, including circuit breakers, returned to the exchanges, while existing limits remained in force pending formal changes. Always verify the current DSE rules and notices.

Educational disclaimer

This article is for educational purposes only. It is not investment, trading, legal, or financial advice. Market rules and price limits can change. Verify current official information before acting.