Upper and Lower Circuit in Stocks Explained

A circuit limit, also called a price band or circuit breaker, is a regulatory cap on how much a stock's price can move in a single trading day. SEBI and the stock exchanges set these limits to prevent extreme intraday price swings that could be driven by panic, speculation, manipulation, or sudden news.

The upper circuit is the maximum price a stock can reach in a single session. Once the stock hits this ceiling, trading is halted. No buy orders can be executed above that level. The lower circuit is the floor: the minimum price a stock can fall to in a single session. Once hit, no sell orders can be executed below that level.

Both limits are calculated as a percentage above or below the previous day's closing price. If a stock closed at Rs 100 and has a 10 percent circuit, the upper circuit for the next trading day is Rs 110 and the lower circuit is Rs 90. The stock cannot trade outside this band regardless of how many buyers or sellers are willing to transact beyond it.

A circuit limit is a daily price fence. The upper circuit is the ceiling a stock cannot rise above in one session. The lower circuit is the floor it cannot fall below.

The rationale behind circuit limits is investor protection and market stability. Without them, a single piece of rumour, a sudden large order, or coordinated manipulation could send a thinly traded stock up or down 70 or 80 percent in a matter of minutes, wiping out investors who have no time to react.

Circuits create a pause that forces the market to absorb information before price discovery continues. When a stock hits the upper circuit, the surge of buying interest is visible to everyone, but no further buying is matched above the circuit price. This gives investors time to ask why the stock is moving so sharply, verify whether there is a credible reason, and decide whether to participate. The same logic applies to the lower circuit during a sell-off.

For thinly traded small-cap and micro-cap stocks, which can be moved significantly by relatively small orders, circuit limits are particularly important. They limit the damage that coordinated pump-and-dump schemes can do on any single day, even if they cannot prevent them entirely over multiple sessions.

Circuit Band Categories: 2%, 5%, 10%, and 20%

SEBI assigns different circuit bands to different stocks based on their liquidity, market capitalisation, trading history, and whether they are included in an index. The four standard individual stock circuit bands are 2 percent, 5 percent, 10 percent, and 20 percent. Stocks in derivatives (futures and options) segments typically have no individual circuit limits, because the derivatives market itself has its own safeguards.

Circuit Band	Typical Stocks in This Category	Notes
2%	Stocks under surveillance, recently suspended, or with very low liquidity	Tightest restriction; SEBI or exchange has flagged elevated risk
5%	Small-cap stocks with limited trading history or under enhanced surveillance	Applied when volatility or manipulation risk is elevated
10%	Many mid-cap and small-cap stocks not in major indices	The most common band for stocks outside the Nifty 200 universe
20%	Larger, more liquid stocks outside the F&O segment	Applied to stocks with reasonable liquidity but not in derivatives
No individual circuit	Stocks in the F&O segment (Nifty 500 and select others)	These have index-level circuit breakers instead; individual halts are rare

The assignment of circuit bands is not permanent. SEBI and the exchanges review and revise bands periodically. A stock can be moved to a tighter band if it shows unusual volatility or comes under scrutiny, and it can be relaxed if its trading profile improves. If you notice a stock you follow has suddenly shifted from a 20 percent band to a 5 percent band, that is itself a signal worth investigating.

Separate from individual stock circuits, SEBI has also established market-wide circuit breakers that apply to the entire exchange simultaneously. These are triggered by movements in the Nifty 50 or Sensex, whichever hits the threshold first, and they pause trading across all exchanges including NSE, BSE, and MCX-SX.

Index Movement	Time of Trigger	Trading Halt Duration
10% fall	Before 1:00 PM	45 minutes
10% fall	Between 1:00 PM and 2:30 PM	15 minutes
10% fall	After 2:30 PM	No halt; market continues
15% fall	Before 1:00 PM	1 hour 45 minutes
15% fall	Between 1:00 PM and 2:00 PM	45 minutes
15% fall	After 2:00 PM	Remainder of the day; market closed
20% fall	Any time	Remainder of the day; market closed

These index-level halts are rare but not unprecedented. India experienced index-level circuit breakers during extreme market events, including during periods of severe global financial stress. The halts are designed to prevent panic from becoming a self-reinforcing spiral by giving investors, institutions, and market makers a chance to step back, reassess, and return with clearer heads.

The sequence of events when a stock hits its upper or lower circuit is worth understanding precisely, because it affects what you can and cannot do.

When a stock reaches its circuit limit, trading in that stock is frozen for the remainder of the trading session in most cases. Pending orders at or beyond the circuit price remain in the order book but are not executed. New orders can be placed at or within the circuit price, but since no trades are possible beyond the limit, matching cannot occur if the entire order book is on one side.

In practice, a stock that hits the upper circuit will have a large queue of buy orders at the circuit price and no sellers willing to sell at or below it. The stock sits at the circuit price, unmoved, with the order imbalance visible on your broker's screen. The reverse is true at the lower circuit: sellers queue up but buyers do not appear at or above that price.

The stock reopens the next trading day with a new circuit band calculated from the previous session's closing price, which is the price at which the circuit was hit. So if a stock closed at its upper circuit of Rs 110 (from a previous close of Rs 100), the next day's circuits are set at Rs 110 as the base, meaning the new upper circuit is Rs 121 and the new lower circuit is Rs 99 (using 10 percent bands). A stock can hit the upper circuit on consecutive days, rising step by step, which is sometimes called a circuit-to-circuit rally.

A stock can hit the upper circuit on consecutive days, rising in steps across multiple sessions. This is a circuit-to-circuit rally, and it can be driven by genuine news or by manipulation.

Two regulatory frameworks are directly connected to circuit limits and are worth knowing as an investor: the Additional Surveillance Measure (ASM) and the Graded Surveillance Measure (GSM).

The ASM framework is applied by SEBI and the exchanges to stocks that show unusual price movements, high volatility, or other risk indicators such as significant price-to-earnings ratio deviations or sudden spikes in trading volumes. When a stock is placed under ASM, it is typically moved to a tighter circuit band, margin requirements for trading it are increased, and the stock may be shifted to a trade-for-trade settlement basis, meaning each trade must be settled individually rather than through the normal netting process. Being under ASM is a regulatory signal that the exchanges consider the stock to carry elevated risk.

The GSM framework applies specifically to stocks that the exchanges believe may be targets of price manipulation or that have very weak fundamentals relative to their market price. Stocks under GSM are placed on a watch list with progressively tighter restrictions across multiple stages. At the most restrictive stage, trading may be limited to once a week. GSM is a more serious classification than ASM, and a stock under GSM Stage IV or Stage V is one that regulators are watching very closely.

Framework	Who Applies It	Key Effect on the Stock
ASM (Additional Surveillance Measure)	SEBI and exchanges (NSE, BSE)	Tighter circuit band, higher margin, possible trade-for-trade settlement
GSM (Graded Surveillance Measure)	Exchanges, with SEBI oversight	Progressive restrictions up to once-a-week trading; signals manipulation concern
Trade-for-Trade (T2T) settlement	Exchanges	No intraday trading allowed; every trade must result in full delivery

If you discover that a stock you own or are considering has been placed under ASM or GSM, treat it as an important piece of information. It does not necessarily mean the company is fraudulent, but it does mean that regulators have flagged something unusual. Do your own research on the fundamentals before acting.

One of the most practical challenges circuit limits create is a liquidity trap. If you hold shares in a stock that is hitting the lower circuit repeatedly, you may find it impossible to sell for several days because there are no buyers willing to transact at or above the circuit price. Every morning the stock opens at the previous day's circuit close, a new lower circuit is calculated, and the stock hits it again before the morning is over. There are sellers but no buyers. Your shares are theoretically worth the circuit price, but you cannot exit.

This situation arises most often in small-cap and micro-cap stocks after bad news, management scandals, or during broad market sell-offs where retail investors panic. It is one of the strongest arguments for being careful about position sizing in illiquid stocks. A stock where the daily traded volume is very low relative to your holding size carries the risk that you cannot exit quickly even in normal conditions, let alone when a lower circuit is in play.

The opposite problem occurs with upper circuit stocks: you want to buy, but there are no sellers. The stock sits at the upper circuit with a large buy queue, and unless a seller appears at that price, no trade occurs. This is why investors sometimes miss entry points in stocks that are rallying sharply; by the time they place their order, the circuit has been hit and the stock is frozen for the day.

The first and most important thing to do is find out why. A stock hitting the upper circuit is not automatically good news, and a stock hitting the lower circuit is not automatically a buying opportunity.

The reason for the move matters far more than the direction.

• Check exchange filings immediately. BSE and NSE both publish company announcements in real time. A quarterly result, a merger announcement, a promoter stake change, a regulatory order, or a management resignation could all explain a sudden circuit move.

• Check for any trading halt notices or surveillance actions. If the exchange has placed the stock under ASM or GSM in connection with the move, that context is important.

• Do not place orders in a frenzy. A stock at the upper circuit with a large buy queue is not a guaranteed trade. Your order joins the queue and may not be filled that day. Do not place multiple orders thinking they will all execute.

• For lower circuit situations, assess whether the reason for the fall is temporary or fundamental. A lower circuit caused by a one-day market panic is different from one caused by a fraud allegation or insolvency filing.

• Check the stock's circuit band itself. If it has suddenly tightened from 20 percent to 5 percent, that tells you something has changed in the exchange's assessment of the stock.

• Be patient. In a lower circuit situation, selling the next day when the stock reopens may be possible if sentiment has stabilised. Placing a limit sell order at or just above the circuit price gives you the best chance of finding a buyer when trading resumes.

For intraday traders, circuit limits create a specific and important risk. If you take an intraday position in a stock and the stock hits the lower circuit before you can square off your position, you may be unable to exit. In such a case, most brokers will automatically convert your intraday position to a delivery position, which means you will need to have the full funds or shares to cover it. If you were short-selling and the stock hits the upper circuit, a similar forced conversion or penalty may apply.

This is one reason why experienced intraday traders avoid stocks with tight circuit bands and low liquidity. The risk of being trapped in a position with no exit is real and can be more damaging than a simple stop-loss scenario in a liquid stock.

Stocks in the futures and options segment do not have individual price circuit limits for the underlying shares, but the derivative contracts themselves have daily price limits. This provides some protection for derivatives traders while preserving more continuous price discovery in the underlying shares.

Upper Circuit vs Lower Circuit at a Glance

Feature	Upper Circuit	Lower Circuit
What it means	Stock has hit the maximum allowed price rise for the day	Stock has hit the maximum allowed price fall for the day
Order book situation	Many buyers, no sellers at or below circuit price	Many sellers, no buyers at or above circuit price
Can you buy?	You can place an order but it may not execute	Yes, if a seller appears at or above the circuit price
Can you sell?	Yes, if a buyer appears at the circuit price	You can place an order but it may not execute
Typical cause	Strong positive news, results beat, merger, operator activity	Bad results, management issue, fraud allegation, sector sell-off
Next day base price	The upper circuit price becomes the new base	The lower circuit price becomes the new base
Investor emotion	Fear of missing out; urgency to buy	Panic; urgency to sell

Disclaimer: This article is for educational purposes only and does not constitute financial or investment advice. Circuit band assignments, surveillance frameworks, and market halt thresholds are subject to revision by SEBI and the exchanges. Always verify current rules and stock-specific circuit bands on the NSE and BSE websites before trading. Equity investments are subject to market risk.