What are the Upper Circuit and Lower Circuit in the Stock Market? 

If you follow the stock market, you have probably heard phrases like “The stock hit the upper circuit today” or “It’s locked in the lower circuit.” For beginners, this might sound technical or confusing. But the concept is very simple.

Upper circuits and lower circuits in the share market are limits placed on how much a stock’s price can move in a single trading day. These limits help control extreme price movements and prevent panic buying or selling. Similar to speed breakers on roads preventing accidents, circuit limits help keep markets stable. In today’s blog, let us understand in detail how these circuits work. 

Upper Circuit – Meaning

An upper circuit is the maximum price a stock can reach during a trading session. Once the stock touches this level, it cannot trade at a higher price for the rest of the day. Upper circuits usually occur when demand for a stock is very high, and fewer investors are willing to sell.

Example 

Suppose a stock closed yesterday at ₹100. If the exchange has set a 10% circuit limit, the price range for the next day’s upper circuit will be ₹110.

If strong buying the next day pushes the price up to ₹110, the stock will reach its upper circuit of 10%.

Lower Circuit – Meaning

A lower circuit is the exact opposite of an upper circuit. It is the lowest price a stock can fall to in a single trading day. Once the stock reaches this level, it cannot fall further that day. Lower circuits usually happen when selling pressure becomes very strong, and buyers are less active.

Example 

Suppose a stock closed yesterday at ₹100, and the lower circuit limit is 10%. It implies that the lower circuit limit for the next day will be ₹90.

Now imagine the company announces disappointing quarterly results. Investors start selling the stock quickly. As selling pressure increases, the price falls to ₹90, which is the lower circuit.

Why Do Stock Markets Use Circuit Limits?

Stock prices fluctuate a lot. Without limits, prices could spike or crash within minutes. This is why stock exchanges like NSE and BSE introduced circuit limits. Some major reasons are listed below. 

1. To Prevent Extreme Price Swings

Financial markets are driven not only by data, but also by emotions. When investors get overexcited or fearful, prices can move sharply.

For example, imagine a rumour spreads online that a company is about to receive a big government contract. Traders rush to buy the stock before confirming the news. Within minutes, the price starts rising rapidly.

Without circuit limits, that stock could move up in a very short time. Circuit limits slow down this movement. This gives the market time to absorb information more calmly.

2. To Protect Retail Investors

Not everyone in the market is a professional trader. If a stock were allowed to crash 40-50% in a single day, small investors could suffer huge losses before they even realise what is happening. Circuit limits reduce that risk by controlling how sharply a stock can fall in one trading session.

For instance, if a stock has a 10% lower circuit limit, the price cannot drop more than 10% in a day.

3. To Prevent Price Manipulation

In some cases, large traders or groups may try to manipulate stock prices by creating artificial demand or supply.

For example, if a few big investors aggressively push buy orders into a thinly traded stock, the price could skyrocket within minutes. Later, they might sell at higher prices while smaller investors rush in.

Circuit limits help in making such manipulation more difficult because they cap the daily price movement.

4. To Reduce Panic Buying and Panic Selling

Markets often react strongly to sudden news. Consider situations like:

• Unexpected earnings announcements
• Government policy changes
• Regulatory investigations
• Global economic shocks

When such news breaks, investors may rush to either buy or sell without fully understanding the implications. Circuit limits help slow the pace of trading during these emotional moments. 

Common Circuit Limits in India on NSE

According to the NSE, stocks in the equity market usually have one of the following daily price bands:

• 2% price band
• 5% price band
• 10% price band
• 20% price band

These percentages show how much the stock price can move above or below the previous day’s closing price.

Why Do Different Stocks Have Different Price Bands?

Not all stocks behave the same way. Some stocks are very liquid and actively traded, while others have lower trading volumes.

Because of this, exchanges assign different price bands depending on the type of stock.

For example:

• Less liquid or riskier stocks may have tighter limits like 2% or 5%.
• More actively traded stocks may have wider limits, like 10% or 20%.

These limits help control volatility and maintain market stability.

Then, some stocks do not have any price bands. This usually applies to stocks that have derivative contracts (F&O) available on them, and scrips on which no derivative products are available but which are a part of the index derivatives, are also subjected to price bands. 

Index-based Market-wide Circuit Breakers 

This was implemented with effect from July 02, 2001. Apart from individual stocks, there are also circuit breakers for the entire market. These apply to major indices such as the Nifty and the Sensex.

Market-wide circuit breaker system applies at 3 stages of the index movement, either upward or downward, at 10%, 15% and 20%. 

When activated, these circuit breakers trigger a coordinated halt to trading in all of the country’s equity and equity derivative markets.

Conclusion 

Upper circuits and lower circuits are simple but important mechanisms that help keep the stock market stable. These circuit limits act like a cooling-off system for the market. Instead of allowing prices to move wildly within minutes, they slow things down and give investors time to understand what is happening around.

Investors do not need to get carried away by circuit movements. A stock hitting upper circuits may look appealing, but it does not mean it is a good investment. Similarly, a stock stuck in a lower circuit does not always mean it is permanently weak. The best approach is to stay focused on fundamentals, long-term growth, and risk management, rather than reacting to daily price moves. For more market updates and insights, download the Pocketful app. Trade equities with zero brokerage and access advanced F&O trading features with zero AMC.

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