Price freeze
What happens when an order is placed at a price beyond the exchange's operating range for that contract — the order reaches the exchange as a frozen order rather than executing.
In plain language
Exchanges do not let a derivative contract trade at absolutely any price a trader types in. Every contract has an operating range around its recent price, recalculated daily.
An order placed outside that operating range does not simply get rejected quietly — it reaches the exchange system as a price freeze, flagging that it falls beyond the allowed band.
How it works
The operating range is computed and updated daily (Chapter 6). Orders placed at prices beyond it reach the exchange as a price freeze. SEBI has separately tightened the rules on when these operating ranges (dynamic price bands) can be widened, via a circular dated 24 May 2024:
| Old rule | New rule | |
|---|---|---|
| Trades needed to flex the band | 25 trades | 50 trades |
| Unique traders on both sides | 5 | 10 |
| Brokerage firms on each side | not specified | 3 |
A further change links markets together: if a stock's price band is adjusted in the cash market, the corresponding derivatives price band moves in step with it, rather than the two markets drifting independently.
A worked example
A stock future's operating range for the day is Rs 480 to Rs 520, based on the previous close. A trader mistakenly keys in a sell order at Rs 460 — below the lower band.
That order does not execute. It reaches the exchange system as a price freeze, held back from the market until either the trader corrects the price or the operating range itself widens through genuine trading activity — which, under the May 2024 rule, now requires 50 trades with 10 unique traders and 3 brokerage firms on each side, not the 25-trade, 5-trader threshold that applied before.
Why NISM asks about it
Chapter 6 introduces price freeze alongside the daily operating range, and covers SEBI's May 2024 tightening of the criteria for flexing dynamic price bands in the derivatives segment. Expect a question naming the old versus new thresholds (25 vs 50 trades; 5 vs 10 traders) for widening a price band.
Common exam traps
- A price freeze is not an outright rejection notice worded that way — it is simply what the exchange calls an order that falls outside the operating range.
- The May 2024 thresholds are 50 trades, 10 unique traders and 3 brokerage firms — do not quote the old 25-trade, 5-trader figures as current.
- Cash market and derivatives price bands now move together when one is adjusted — they are no longer set independently for the same underlying.
Check yourself
1.Regarding price bands in the equity derivatives segment, which statement is CORRECT?
- a)A 20% price band applies to all derivatives contracts
- b)There are no price bands in the derivatives segment; operating ranges of 10% of the base price apply to index futures and futures on individual securities to prevent erroneous order entry
- c)Price bands are the same as those in the cash market for the underlying stock
- d)Options contracts have a fixed 10% band, while futures have no restriction at all
Show the answer
Answer: (b) There are no price bands in the derivatives segment; operating ranges of 10% of the base price apply to index futures and futures on individual securities to prevent erroneous order entry
The workbook opens this topic with a statement that surprises most candidates: there are no price bands applicable in the derivatives segment. What exists instead, in order to prevent erroneous order entry, are operating ranges and day minimum/maximum ranges — 10% of the base price for index futures, 10% of the base price for futures on individual securities, and for index and stock options a contract specific price range based on its delta value, computed and updated daily.
Orders placed beyond these ranges reach the Exchange as a price freeze.
Option A invents a 20% figure. Option C is wrong because the derivatives operating ranges are set on the derivative contract's own base price, not imported from the cash market — although note that under the dynamic price band rules a cash or futures market band adjustment does cause all futures contracts of that stock to change at the same time.
Option D reverses the two treatments: it is options that get a delta-based, daily-updated range, and futures that get the flat 10%.
Where this is taught
Free preparation for NISM Series VIIIRelated terms
- Limit orderAn order to buy or sell a contract at a specified price or better — lower for a buy, higher for a sell — which waits in the order book if it cannot be matched at once.
- Market orderAn order to buy or sell a contract at the best price currently available in the market — no price is specified, so it trades immediately against the opposite side of the order book.
- Trading limitThe exposure ceiling a clearing member sets, through the trading system, for each trading member it clears for — distinct from the market-wide position limit SEBI itself defines.