Circuit Limits Explained: Stock Bands and Market Halts

Circuit limits can mean a stock’s permitted price range or an index-triggered market halt. They work differently. A stock reaching its upper or lower band can still trade within that band if matching orders exist. A market-wide circuit breaker pauses equity and equity-derivatives trading nationwide when the Nifty 50 or BSE Sensex reaches a specified threshold. Neither mechanism guarantees that your exit order will trade.

Stock price bands versus a market-wide circuit breaker

A stock at lower circuit often has sellers waiting for buyers. The price limit prevents trading below the permitted floor, but it does not supply a buyer. Upper circuit reverses the practical problem for someone trying to buy: an acceptable order can remain waiting if no seller is available.

Upper circuit and lower circuit meaning

A stock's upper circuit is the highest price at which it is allowed to trade on that day. Its lower circuit is the lowest. Together they form the price band. The exchange (NSE or BSE) works out the band from the previous day's closing price, called the reference price. When the share touches the upper limit it is said to be "hitting upper circuit", and at the lower limit "lower circuit".

Made-up example: a stock closed at ₹100 and has a 10% band. The upper circuit is ₹100 + ₹10 = ₹110 and the lower circuit is ₹100 − ₹10 = ₹90. No trade can happen above ₹110 or below ₹90 that day. The next day the band is built again from that day's close. Short definitions are in the upper circuit and lower circuit entries.

The name "circuit" is also used for the market-wide halt in the section above, which is a different rule. This page uses "band" for a single stock and "circuit breaker" for the whole-market halt.

Index halt timetable in Indian market time

NSE’s published framework uses 10%, 15% and 20% index moves in either direction from the previous close. NSE cites SEBI circular CIR/MRD/DP/25/2013, dated 3 September 2013, and its own implementation circular dated 11 October 2013. The timetable below was checked on 16 October 2026. All times are Indian Standard Time.

The pre-open auction is a separate period for finding a reopening price. Do not treat the halt duration alone as the time until continuous trading returns. Check the exchange announcement for the actual restart. A headline saying the index hit a circuit does not tell you the restart time without the threshold and trigger time.

Which stocks have fixed bands?

NSE lists fixed daily bands of 2%, 5%, 10% and 20%. Securities with their own derivatives do not have these fixed bands; they have an operating range that can be adjusted under exchange rules. A share does not lose its fixed band merely because it belongs to an index with derivatives. NSE expressly says index constituents without their own derivatives remain subject to price bands.

Check the security’s current published limits rather than selecting a percentage from its size or popularity. Surveillance action and special trading arrangements can affect what applies. The upper-circuit definition and lower-circuit definition explain the two edges in more detail.

Dynamic price bands for F&O stocks

Shares that have futures and options do not get a fixed 2%, 5%, 10% or 20% band. In the derivatives segment, NSE sets an operating range instead of a day minimum and maximum. NSE's derivatives price band page states that operating ranges are 10% of the base price for index futures and for futures on individual securities. Orders priced beyond the operating range reach the exchange as a price freeze and are rejected.

The range can widen, which is called flexing. NSE describes it as system-driven. When trading in the contract reaches the edge of the range, the range is relaxed in steps in the direction of the move (the first step is 5%; a later NSE circular made the later steps smaller), subject to conditions on the number of trades. Because the conditions have been revised, do not rely on an old number. Read the current NSE circular before you depend on it.

This is why such shares can fall or rise by more than 10% in a day without a fixed lock. It also means the "circuit" for these shares moves during the session, and that a share removed from the derivatives list may go back to a fixed band. Related reading: the F&O ban list is a separate limit that restricts new positions, not prices.

Example: reaching the floor does not complete a sale

In this fictional stock example, assume the exchange reference price is ₹240 and the applicable band is 5% either way. The distance is ₹240 × 5 ÷ 100 = ₹12, giving a lower limit of ₹228 and an upper limit of ₹252. These are round-number illustrations; use the exchange’s published limits for an actual order.

Suppose you hold an illustrative 300 shares bought at ₹240. At ₹228, the unrealised price loss is (₹240 − ₹228) × 300 = ₹3,600 before charges. If no buyer takes your sell order, that amount is still an unrealised loss. Placing the order does not make it a completed sale, and a later session can expose you to a different price range.

A planned stop at an illustrative ₹234 would represent (₹240 − ₹234) × 300 = ₹1,800 of price risk only if execution occurred there. If available buyers disappear, the planned amount and the actual outcome can differ. A stop trigger, order acceptance and completed trade are separate events.

Can you buy or sell when a stock is locked?

Yes, but only at prices inside the band, and only if someone is on the other side. A stock is called "locked" when it sits at its upper or lower limit and one side of the market has orders waiting with almost nobody on the other side. Your order is accepted by the exchange, but it can stay pending.

• Lower circuit lock. Many sellers, few buyers. A sell order at the floor price joins a long queue. You may sell only a part of the quantity, or none, until buyers appear.
• Upper circuit lock. Many buyers, few sellers. A buy order at the top price waits behind other buyers. You may get no shares.
• Order priority. Orders at the same price are generally matched in the order they arrived, so a late order is further back in the queue. Check your broker's order book for the filled and pending quantity.

A pending sell order is not a sale. Until it fills, you still own the shares and bear the price risk. A band also does not stop the price moving on later days. If the stock keeps falling, the next day's band is built from the new close.

If you hold an intraday (same-day) position and the stock locks, you may be unable to close it before your broker's cut-off. Brokers have their own auto square-off rules, so read the auto square-off guide and the square-off entry. For short selling in the cash market, a lock at the upper limit can block your buy-back. Ask your broker what happens if you cannot deliver.

Example: index thresholds use the previous close

For a separate made-up index close of 25,000, a 10% move is 2,500 points. The corresponding illustration levels are 22,500 downward and 27,500 upward. NSE computes actual daily thresholds using the previous closing index and rounds to the nearest tick, meaning the allowed price increment. Use the published threshold rather than an unrounded mental calculation.

An option position cannot be valued from the index percentage alone. Its strike, remaining time, volatility and available quotes also matter. A market halt does not fix the option premium or cap the position loss.

What to check when an order is waiting

• Identify whether this is a security price band, an index halt or a separate trading restriction.
• Read the current exchange message and the instrument’s upper and lower limits.
• Check the order status and completed quantity before treating a position as closed.
• Keep the intended exit and actual execution separate in your trade notes.

The circuit-limit calculator can help with a price-band illustration. It cannot create liquidity or certify that an order will execute. OneTradeJournal lets you record the attempted exit and actual result by hand for later review.

How to check a stock's circuit limit

• On the NSE or BSE quote page for the stock, look for the price band, or the lower and upper limits, shown with the day's quote.
• In a broker app, the stock's detail page shows the day's lower and upper circuit values next to the last traded price.
• Check the date. The band can change from day to day, and exchanges can change a stock's band after a review.
• If a stock has derivatives, look for the operating range rather than a fixed percentage.

Our circuit limit calculator works out the limits from a reference price and a band that you type. It does not fetch any live price band.

Pros and cons of circuit limits

Questions about circuits

Index circuit breaker and an options position

Take a made-up case. The Nifty 50 closed at 25,000. A 10% fall is 2,500 points, so the first halt level is 22,500. If that level is hit before 1:00 pm, the table above shows a 45-minute halt followed by a 15-minute pre-open auction. During the halt you cannot add to or close an option position, even if you want to cut a loss. When trading resumes the option prices may be far from where they were. Index circuit breakers are rare, and this example is not a forecast or a record of any past day.

The practical lesson for a journal is to note not only your stop price, but what you would do if the market is closed to you for an hour. Mark any trade where you took extra size because you assumed you could always exit.

Sources

• NSE: market-wide halt schedule (checked 16 October 2026).
• NSE: security price bands (checked 16 October 2026).