Exercise
Also written Exercise of an option · Option exercise · To exercise
Putting an option's right into effect: a call holder buys the underlying at the strike, a put holder sells at the strike. In cash settled IRD options the holder simply receives the difference.
In plain language
Buying an option buys a right. Exercise is using it.
The workbook's wording: "to exercise" means to put into effect the right to buy or sell the underlying security that is specified in the options contract. If the holder of a call exercises, he buys the underlying at the stated price; if the holder of a put exercises, he sells it at the stated price.
Its land example makes the choice concrete. Mr X paid Rs 50,000 for the right to buy land at Rs 10,00,000. If the land is worth Rs 15 lakh on the expiry date, Mr X will exercise, paying only Rs 10 lakh. If it is worth less, he lets the right lapse.
Only the buyer decides. The seller has no choice: when the buyer exercises, the seller is assigned and must perform. The workbook warns every option writer that assignment is a distinct possibility.
How it works
When a buyer exercises. A call is exercised only if the underlying price is higher than the strike; a put only if it is lower. Where transaction or regulatory charges apply at exercise, the buyer weighs those too.
When exercise is allowed — the style.
| Style | Exercise permitted |
|---|---|
| European | Only on the expiration date |
| American | Any time on or before expiration |
| Bermudan | On specific days before expiration, usually near expiry |
Exchange-traded interest rate options are premium style European calls and puts, so they are exercised only at expiry. A holder who wants out earlier sells the option in the market to square off.
Exercise and moneyness. Moneyness is defined by the cash flow on exercise: in the money gives a positive cash flow, out of the money a negative one, at the money zero. Intrinsic value is what the buyer would realise, before premium, by exercising instantly.
At expiry on the exchange (Chapter 7). For options on cash settled IRF on G-Secs, all open long in-the-money contracts are automatically exercised at the final settlement price and assigned on a random basis to open short positions of the same strike and series. Exercise settlement happens on T+1 by debit or credit of clearing members' accounts with the clearing bank, and exercised contracts are assigned and allocated at the client level.
Final settlement price = weighted average price of the underlying bond over the last two hours of trading on NDS-OM; if fewer than 5 trades occur in that window, the FIMMDA/FBIL price is used.
A worked example
The workbook's put, scaled to lots. Long a put on 6.10% GOI 2031, strike 98.50, premium 0.30. Take 5 lots (illustrative) = 10,000 bonds. Premium paid = 0.30 × 10,000 = ₹3,000.
Case 1 — bond settles at 98.00. In the money. The contract is exercised automatically. Cash received on exercise = (98.50 − 98.00) × 10,000 = ₹5,000. Net = ₹5,000 − ₹3,000 = ₹2,000, matching the workbook's 0.50 − 0.30 = 0.20 per bond.
Case 2 — bond settles at 98.40. Still in the money, so still exercised: receipt = 0.10 × 10,000 = ₹1,000. Net = ₹1,000 − ₹3,000 = −₹2,000. Exercise reduced the loss; it did not create a profit. The break-even is 98.20.
Case 3 — bond settles at 98.75. Out of the money. Not exercised. Loss = the ₹3,000 premium.
The seller's side of Case 1. A put writer holding a short position in the same strike and series is picked at random for assignment and pays the ₹5,000 on T+1, having earlier collected ₹3,000.
Why NISM asks about it
Chapter 4 (Exchange Traded Interest Rate Options) defines exercise in section 4.1, ties it to option style in section 4.3 and to moneyness and intrinsic value in sections 4.4 and 4.5; the contract specification in section 4.9 fixes exchange-traded IROs as European. Chapter 7 (Clearing, Settlement and Risk Management) sets out automatic exercise of in-the-money long positions, random assignment and T+1 settlement. Expect questions on which style allows exercise when, when a rational buyer exercises, and what happens to in-the-money options at expiry.
Common exam traps
- Exercise is the buyer's right; the seller is assigned.
- European = only on expiry; American = any time up to expiry; Bermudan = specified dates.
- Exchange-traded IROs are European — but can still be sold before expiry to square off.
- In-the-money long positions are exercised automatically at expiry, assigned randomly to shorts of the same strike and series, settled T+1.
- Cash settled exercise pays only the difference; no bond changes hands.
- In the money is not the same as profitable. A put exercised at 98.40 against a 98.50 strike and 0.30 premium still loses 0.20.
- Watch the square-off example in section 4.8.5. The workbook prices 5,000 lots at 0.21 as Rs 1,050 (5,000 × 0.21), which ignores the 2,000-bond lot size stated in the contract specification; with the lot size the premium would be Rs 21,00,000. Learn the method (premium received on square-off less premium paid), and apply the lot size when a question gives it.
Check yourself
1.Under which style of option does the contract denote specific days before expiration on which the holder may exercise, with those dates usually near the expiration date?
- a)American option
- b)European option
- c)Bermudan option
- d)Premium style option
Show the answer
Answer: (c) Bermudan option
"The contract for a Bermudan-style option denotes specific days before expiration on which the trader can exercise his option. The specified exercise dates are usually near the time of the option's expiration date." The workbook places it "in between American and European options in terms of how much freedom a trader has to exercise the option."
- American (a) is wrong: it "can be exercised by the buyer any time on or before the expiration date" — any trading day, not a set of specified days.
- European (b) is wrong: it "can be exercised by the buyer of the option only on the expiration date." (An exchange traded European option can still be sold in the secondary market before expiry — that is squaring off, not exercise.)
- Premium style (d) describes how the premium is paid — the IRO contract specification reads "Premium style European Call & Put Options" — not when the option may be exercised.
2.An option is _________ if, on exercising it, the option buyer gets a negative cash flow.
- a)Out of the money
- b)In the money
- c)At the money
- d)At par
Show the answer
Answer: (a) Out of the money
Moneyness indicates whether the contract would result in a positive, negative or zero cash flow for the option buyer at the time of exercising it.
- ITM → positive cash flow on exercise
- ATM → zero cash flow (spot equals strike)
- OTM → negative cash flow
A call is OTM when the strike price is GREATER than the spot price; a put is OTM when the strike price is LESS than the spot price. In practice the buyer would simply let an OTM option lapse — the "negative cash flow" describes the hypothetical result of exercising it anyway.
3.A participant holds a European exchange traded interest rate option and wants to exit the position two weeks before expiry. What can he do?
- a)Sell the option in the secondary market to square off the position, since exercise is restricted but trading is not
- b)Nothing — a European option cannot be exited before the expiration date
- c)Exercise the option early, since exchange traded options are always American in practice
- d)Request the clearing corporation to cancel the contract on payment of a fee
Show the answer
Answer: (a) Sell the option in the secondary market to square off the position, since exercise is restricted but trading is not
European options can be exercised by the buyer only on the expiration date, so the holder does have less flexibility on exercise. However, the workbook adds the crucial rider: "in case of exchange traded options, participants can sell their option in the secondary market prior to option expiration date to square-off their position."
⚠️ Keep the two ideas separate: European style restricts early EXERCISE, not early EXIT. The workbook illustrates exactly this with the dealer who bought October puts on 1 October and squared them off on 15 October when he no longer needed the hedge.
Option (c) is wrong on the facts — exchange traded interest rate options in India are premium style EUROPEAN call and put options.
Where this is taught
Free preparation for NISM Series IVRelated terms
- Intrinsic valueWhat an asset is actually worth — the present value of the cash it will generate over its remaining life, as against whatever price the market is quoting today.
- Final Settlement PriceThe price at which a commodity derivative is finally settled at expiry — a simple average of the polled spot prices of the expiry day and the two days before it.
- American optionAn option whose holder may exercise it at any time on or before expiry. All exchange-traded index and stock options in India are European style instead — exercisable only on expiry.
- AssignmentThe allocation of exercised options to one or more option sellers — the moment the writer's obligation becomes a real cash outflow, decided by the exchange and not by the writer.
- Bermudan optionAn option that can be exercised only on specific dates named in the contract, usually near expiry — more flexible than a European option, less flexible than an American one.
- Call optionA contract giving its buyer the right, but never the obligation, to buy the underlying at a fixed strike price — so the loss is capped at the premium and the gain is not.
- Strike priceThe price fixed in an option contract at which the buyer may buy (call) or sell (put) the underlying if he chooses to exercise — fixed for the life of the contract, unlike the premium.
- European optionAn option that can be exercised only on its expiry date. Indian equity options are European — coded CE for calls and PE for puts — unlike American options, exercisable any time up to expiry.
- Put optionA contract giving its buyer the right, but never the obligation, to sell the underlying at a fixed strike price — insurance against a fall, bought for a premium.
- Out-of-the-moneyAn option that would produce a negative cash flow if exercised immediately — a call with the spot below the strike, or a put with the spot above it. Its intrinsic value is zero and its premium is all time value.