What are Upper Circuits and Lower Circuits?

Upper and lower circuits set the price range within which certain stocks can trade during a session. They help control extreme price movements.

• An upper circuit is the highest permitted price within the applicable price band.
• A lower circuit is the lowest permitted price within the applicable price band.
• Fixed price bands can be 20%, 10%, 5%, or 2%, depending on the security and applicable surveillance measures.
• Market-wide circuit breakers for major indices are triggered at 10%, 15%, and 20% movements.
• For fixed price bands, the limits are generally calculated using the stock’s previous closing price.
• Demand, supply, company developments, economic factors, and investor sentiment can push prices towards these limits.
   

An upper circuit is the highest price permitted for a stock under its applicable price band during a trading session.
A stock may reach this level when buying demand is strong compared with available selling interest. Once the price reaches the upper limit, orders cannot be placed above the applicable price band.
Reaching the upper circuit does not necessarily mean that all trading in the stock stops. Trades may still happen at the permitted price if sellers are available.
For example, if a stock has a fixed upper price limit of ₹2,200, buyers cannot place orders above ₹2,200 while that price band remains applicable.
 

A lower circuit is the lowest price permitted for a stock under its applicable price band during a trading session.
A stock may reach this level when selling pressure is high compared with buying interest. Orders cannot normally be placed below the applicable lower price limit.
However, reaching the lower circuit does not automatically stop all trading. A trade can still take place at the permitted price if a buyer and seller are available.
For example, if the lower circuit is ₹1,800, a sell order cannot be placed below ₹1,800 while that price band remains applicable.
 

Stock price bands are not determined simply by whether a security belongs to groups such as A, B, T, TS, or S. The applicable price band depends on the security and exchange surveillance framework.

For securities without derivative products, fixed price bands can be set up to 20%, while exchanges may apply 10%, 5%, or 2% bands as surveillance measures. Securities with derivative products generally use dynamic price bands instead.

Here is a simple example of how a fixed circuit limit works.

Suppose a stock has a 10% circuit limit and its previous closing price is ₹2,000.

The limits are calculated using the applicable base price, which is generally the previous closing price for securities with fixed price bands.

Also read: What is technical analysis?

Market-wide circuit breakers work differently from individual stock price bands.

They are triggered when either of the specified benchmark indices moves sharply in either direction. The circuit breaker levels are 10%, 15%, and 20%.

When a market-wide circuit breaker is triggered, trading is halted according to the applicable rules. The duration depends on the circuit level and the time at which it is triggered.

Knowing the upper and lower circuit limits can help you understand a stock’s permitted trading range and manage trading risk.

1. Use stop-loss orders carefully

   
   

   A stop-loss order may help limit losses, but execution is not guaranteed. If a stock reaches its lower circuit and there are no matching buyers, your sell order may remain pending.

   
   

2. Monitor circuit limits

   
   

   Check the applicable upper and lower price limits when following a stock. This can help you understand how far its price can move within a fixed price band.

   
   

3. Avoid following the crowd

   
   

   A stock reaching its upper circuit does not guarantee that its price will keep rising. Similarly, reaching a lower circuit does not by itself tell you whether the stock is a suitable investment.

   
   

4. Research the reason for the movement

   
   

   Consider factors such as earnings, debt, P/E ratios, industry conditions, and company news before making an investment decision.

   
   

5. Assess the situation carefully

   
   

   Reaching an upper or lower circuit shows that the price has reached its permitted limit. The circuit level alone should not be treated as a signal to buy or sell.

   
   
   

Demand and supply can push a stock towards its upper or lower price limit. Several factors may affect this demand and supply.

1. Mergers and acquisitions

   
   

   News about mergers or acquisitions can change how investors view a company. Positive expectations may increase demand, while concerns about financial pressure may reduce it.

   
   

2. Political developments

   
   

   Political uncertainty can affect investor confidence and market prices. Changes viewed positively by investors may have the opposite effect.

   
   

3. Changes in trade agreements

   
   

   Trade agreements may affect companies that depend on international trade. Favourable or unfavourable developments can therefore influence demand for their shares.

   
   

4. Interest rate changes

   
   

   Changes in interest rates can affect borrowing costs, investment activity, and investor sentiment, which may influence stock prices.

   
   

5. Company financial performance

   
   

   Strong or weak financial results can affect investor demand for a company’s shares.

   
   

6. Expansions, insolvencies, and consolidations

   
   

   Business expansion, insolvency, or consolidation announcements may change investor expectations about a company.

   
   

7. Investor confidence

   
   

   Positive or negative company and market news can affect demand, supply, and share prices. These factors can cause strong price movements that take a stock towards its applicable upper or lower circuit.

   
   
   

For stocks with fixed price bands, the circuit limits are generally calculated using the applicable base price, such as the previous closing price. If this price changes, the numerical upper and lower limits for the next session can also change.
Demand and supply determine whether the stock price actually moves towards these limits.

1. Organisational structure changes

• Mergers and acquisitions: Market expectations following a merger or acquisition can increase or reduce demand.
• Expansions, insolvencies, and consolidations: Such developments can change expectations about the company’s future performance.

2. External factors

• Political instability: Political uncertainty can affect investor confidence.
• Trade agreements: Changes in trade arrangements can affect companies that benefit from or depend on international trade.
• Interest rates: Changes in interest rates can influence investment activity and stock prices.

3. Company performance

Strong financial performance may increase investor demand, while weaker performance may reduce it.

4. Investor sentiment

Positive or negative news can influence buying and selling activity.
Together, these factors influence demand and supply and may push a stock towards its upper or lower permitted price level.
 

Here are some important points about upper and lower circuits:

• Circuit limits and price bands are mechanisms used to control extreme price movements.
• Applicable circuit or price-band information is published by stock exchanges and can change based on surveillance measures.
• If a stock reaches its upper circuit and there are no sellers, a buy order may remain pending.
• If a stock reaches its lower circuit and there are no buyers, a sell order may remain pending.
• Trades can still occur at the circuit price when matching buy and sell orders are available.
• Circuit limits may be revised depending on surveillance criteria, market conditions, volatility, and trading volumes.

The original statement that all intraday orders are automatically converted into delivery orders after a circuit breach has been removed because this is not a general exchange rule and may depend on the broker and whether the position can actually be settled.

Upper and lower circuits define the permitted price range for certain stocks during a trading session. They are designed to control extreme price movements and support orderly trading.
The applicable limits can differ between securities and may change under exchange surveillance measures. Before placing a trade, check the current price band and remember that reaching a circuit can affect order execution, especially when there are few matching buyers or sellers.