Upper and Lower Circuits

"Tags: upper circuit, lower circuit, price band, circuit breaker, order queue Prerequisites: Liquidity, Gap Up and Gap Down A price limit can pause movement, but it cannot manufacture a willing counterparty. Questions this article answers What is an upper or lower circuit? Why do exchanges use price bands? Why can an order remain unexecuted at the circuit price? How are stock-level price bands different from market-wide circuit breakers? 1. Stock-level price bands Many securities trade within exchange-defined daily price bands or surveillance limits. An upper circuit is the highest permitted trading price for the session under that band. A lower circuit is the lowest permitted price. The applicable framework can vary by security, segment and current exchange rules. 2. Why price bands exist Price bands are designed to reduce extreme disorderly movement, allow information to be processed and support market integrity. They do not declare the correct value of a stock and do not prevent losses. 3. What happens at an upper circuit If aggressive demand pushes price to the upper limit and very few sellers are willing to sell, buy orders can accumulate in a queue. Seeing the stock at upper circuit does not mean every buyer received shares. Many orders may remain pending without execution. 4. What happens at a lower circuit If selling pressure pushes price to the lower limit and buyers withdraw, sell orders can accumulate without execution. A shareholder may want to exit but remain trapped because there is no matching buyer. 5. Price limit does not equal liquidity The circuit price is a permitted boundary, not a guaranteed transaction price for unlimited quantity. Execution still requires a counterparty. 6. Order queues At a one-sided circuit, the order book may show a large quantity on one side and almost nothing on the other. Queue priority follows exchange rules such as price and time priority, but an order executes only if opposite-side quantity appears. 7. Repeated circuits A stock can hit upper or lower circuits across multiple sessions if demand or supply remains one-sided. A lower-circuit sequence can create losses far beyond a normal stop because exits may be unavailable for days. 8. Why illiquid stocks are especially dangerous Thin free float, concentrated ownership, promotional activity or sudden adverse information can create severe one-sided trading. The apparent ease of entering during optimism can disappear when sentiment reverses. 9. Market-wide circuit breakers Market-wide circuit breakers are different from stock-specific price bands. They are triggered by large moves in designated broad indices and can lead to market-wide trading halts under current rules. Exact trigger levels and procedures should be checked from official exchange sources because frameworks can change. 10. Dynamic surveillance measures Exchanges may apply additional surveillance, trade-to-trade settlement requirements or revised price bands to certain securities. These measures are risk signals that require attention, not trading recommendations. 11. Common beginner mistakes Buying because a stock repeatedly hits upper circuit One-sided demand can reverse, and exit liquidity may vanish. Assuming a lower-circuit sell order must execute No buyer means no trade. Treating the circuit price as fair value It is an exchange limit, not a valuation conclusion. Using normal stop-loss assumptions in circuit-prone stocks The order may remain unexecuted across sessions. Confusing stock bands with market-wide halts They are separate mechanisms. 12. DStreet principle The most dangerous position is not merely one that is falling. It is one that cannot be exited. 13. Beginner checklist I know circuits are trading limits, not guaranteed prices. I understand that orders need counterparties. I treat repeated one-sided circuits as severe liquidity risk. I separate stock price bands from market-wide circuit breakers. I check official exchange information for current rules. 14. Quick knowledge check Question: What is an upper circuit? Answer: The highest permitted trading price under the applicable daily band. Question: Why might a buy order not execute at upper circuit? Answer: There may be no seller. Question: Why might a sell order not execute at lower circuit? Answer: There may be no buyer. Question: Are market-wide circuit breakers the same as stock price bands? Answer: No. 15. Next lesson Corporate Actions explains events that change share count, cash distribution or company structure and can alter historical chart data."