Upper and Lower Circuits Explained: When a Stock Stops Trading
TL;DR
- Circuit limits, also called price bands, cap the maximum percentage a stock can move in a single trading day above or below its previous close.
- For stocks in the F&O segment and Group A securities, price bands are not applied; only market-wide index circuit filters apply.
- For non-F&O stocks, exchanges set circuit limits of 2 percent, 5 percent, 10 percent, or 20 percent based on liquidity and price history.
- Upper circuit means the stock can only have buyers at that price and no sellers; lower circuit is the opposite. Trading effectively pauses for the rest of the day at that price.
- Index-level circuit breakers under SEBI's market-wide circuit filter halt trading on Nifty or Sensex moves of 10 percent, 15 percent, or 20 percent.
What this means in plain terms
If you wake up to news that your stock is in upper circuit, your screen will show a queue of buyers at the highest allowed price but no shares being sold. You cannot buy unless an existing holder agrees to sell at that price, which rarely happens during a strong move. The reverse happens at lower circuit; you cannot sell because no one is willing to buy.
Circuits are SEBI's way of preventing panic-driven crashes and speculative blow-offs. They give investors time to think, brokers time to call clients about margin, and the exchange time to investigate any potential manipulation. They are not a tax or a penalty, just a pause.
How circuits are set
Stock-level price bands
Exchanges classify stocks into different price band buckets. Non-F&O stocks have daily price bands of 2 percent, 5 percent, 10 percent, or 20 percent. Stocks newly listed or those with a history of high volatility tend to have tighter bands.
Reference price
The circuit is computed from the previous day's closing price. If a Rs. 100 stock has a 10 percent band, it can trade between Rs. 90 and Rs. 110 that day. Once it hits either extreme, no orders outside that band can be placed.
Index-level market-wide circuit breakers
If Nifty 50 or Sensex moves 10 percent in either direction before 1 pm, trading is halted for 45 minutes. A 15 percent move triggers a longer halt, and a 20 percent move halts trading for the rest of the day. The exact timings reduce as the day progresses.
How upper circuit works
What you see on the screen
When upper circuit is hit, the order book shows only buyers stacked at the upper limit with zero sellers. Brokers usually flag the stock with a yellow or red marker. Any new sell order at or near the upper price gets filled immediately as long as the queue holds.
Pending buy orders
If you placed a buy at limit Rs. 110 and the stock hits Rs. 110 upper circuit, your order joins the queue. Whether it gets filled depends on order time priority and how many sellers, if any, appear. Often, none do.
Implications for option sellers
Stocks at upper circuit can break out further the next day. Option sellers and futures shorts caught on the wrong side may face mark-to-market losses that exceed their initial margin, leading to forced position closure under SEBI margin rules.
How lower circuit works
What you see on the screen
Sell orders stack up at the lower limit with no buyers willing to step in. The price stays frozen at the lower band, and your sell orders sit in the queue unfilled. The next day the circuit recalculates from the new closing price, which may be even lower.
Margin calls
If you bought on margin and the stock hits lower circuit, your broker will call for additional funds. Failure to deposit can lead to forced selling on subsequent days, which is painful because lower circuit typically continues for several days in distressed stocks.
Cascade risk
Highly leveraged investors face the worst of lower circuits because they cannot exit. This is why SEBI's October 2024 margin rules tightened upfront margin requirements for cash market trades.
When circuits do not apply
F&O stocks
Stocks in the futures and options segment do not have stock-level circuit filters because their derivatives provide a continuous price discovery mechanism. They are subject only to market-wide circuit breakers.
Special pre-open session for IPOs and corporate actions
On the day of a major corporate action like a stock split or bonus issue, the stock may have a special pre-open session with no circuit filter so that the adjusted price discovery is fair. After the session, normal circuit limits resume.
Block deal and bulk deal windows
In the morning and afternoon block deal windows, trades between two parties happen at negotiated prices, which can fall outside the regular session's circuit bands within defined limits set by the exchange.
A real example
Karthik, 35, Rs. 22L CTC, Chennai, holds 200 shares of a mid-cap pharma company at an average cost of Rs. 480. The stock has a 10 percent daily circuit limit. On a Monday it closes at Rs. 600. On Tuesday the company announces a US FDA observation, and the stock hits a 10 percent lower circuit at Rs. 540.
Here is what plays out:
- Karthik places a sell order at Rs. 545 limit. It does not execute because no buyers are willing to take stock at any price above Rs. 540.
- He revises the order to Rs. 540 market sell. It joins a queue of 2 lakh shares already waiting at the same price.
- The stock closes Tuesday at Rs. 540, lower circuit frozen.
- Wednesday the circuit recalculates: 10 percent of Rs. 540 = Rs. 54, so the new lower circuit is Rs. 486.
- The stock opens Rs. 500 and Karthik exits at Rs. 495. He realises a loss of Rs. 200 x (Rs. 495 minus Rs. 480) wait, that is a gain of Rs. 3,000 on a position bought at Rs. 480.
The bigger lesson is that lower circuits can persist for two to three days, and exit is rarely possible at the first day's price. Sizing positions to a level you can afford to hold through multiple circuit days is essential.
What to do this week
- Check your top three holdings on NSE's website to see what their current daily price band is, so you know how much they can theoretically move in a day.
- Make sure you do not have any position where a 20 percent adverse move would wipe out more than 10 percent of your portfolio.
- Avoid placing market orders in stocks with low liquidity or tight circuit bands, especially around earnings or regulatory announcements.
- Read your broker's margin policy to understand what happens if your stock hits lower circuit and you owe margin.
- Run the 6-step assessment at https://myfinancial.in to see your old-vs-new regime delta, unused deductions, and insurance gap in under 10 minutes.
FAQ
Can a stock have upper circuit for multiple days?
Yes. Strongly bullish stocks can hit upper circuit for several consecutive sessions. Each day the band recalculates from the new close, so the absolute price keeps climbing while the daily percentage stays the same.
Will my limit order execute if I place it above the upper circuit?
No. The exchange rejects orders outside the daily price band. You can only place orders within the band, and they will queue if priced at the limit.
Do market-wide circuit breakers apply to all stocks?
Yes. When Nifty or Sensex triggers the 10 percent, 15 percent, or 20 percent halt, trading across cash and derivatives segments stops on both NSE and BSE for the prescribed duration.
Does circuit limit affect IPO listings?
Listing day for mainboard IPOs typically has a no-circuit regime for price discovery in the special pre-open session. After listing, normal circuit limits apply from the next day.
How do I find a stock's circuit limit?
Visit the NSE or BSE website, search the stock, and check the "Price Band" field on the stock quote page. Brokers also display it on the order placement screen.
Can the exchange change a stock's circuit limit mid-day?
Yes. If a stock hits upper or lower circuit in unusual circumstances, the exchange can revise the band or move the stock to trade-to-trade settlement after market hours.
Does GST or STT change during circuits?
No. STT, stamp duty, and SEBI fees apply at the same rates regardless of whether the trade happens at the circuit price or any other price. GST on brokerage stays at 18 percent.
Sources
- https://www.sebi.gov.in/legal/circulars/jun-2001/circuit-filters_31077.html
- https://www.nseindia.com/regulations/exchange-circular
- https://www.bseindia.com/markets/equity/EQReports/CircuitInfo.aspx
- https://www.sebi.gov.in/legal/circulars/oct-2024/standardisation-of-disclosure-requirements_88123.html
- https://www.nseindia.com/products-services/equity-market-trading
This is general information, not personalised advice. For your situation, consult a Certified Financial Planner.
