Exercise Price and Strike Price: The Same Thing, Two Names

The exercise price and the strike price are two names for one level, the figure written into the contract that the buyer choice at the end gets measured against. Neither name means what it costs to exercise. The premium bought the right on day one. The level changes hands only if the right is used, and those are two different amounts moving on two different dates.

One contract. One level fixed inside it. Two vantage points looking at that level from two different days. Seen from the day the contract was made, the level is what the contract was struck at. Seen from the day the right gets used, the same level is the price at which the using happens. Nothing about the contract changes as the vantage point moves, and nothing about the number changes either. Almost every muddle that follows belongs to a reader who has quietly assumed otherwise, so the point is worth planting before anything else.

Is the exercise price the same as the strike price?

Yes, and completely. There is no shade of difference to keep in reserve, no situation in which the two come apart, and nothing to reconcile between them. In the invented contract this guide works with, the level is Rs 2,000.00/-. The level was settled on the day the two sides agreed to deal with each other, it was written down, and it does not move again for as long as the contract lives. Strike price names that Rs 2,000.00/-. Exercise price names the same Rs 2,000.00/-.

A reader often arrives here because two documents use different words for what looks like the same slot, and the reasonable suspicion is that different words point at different things. Here they do not. A sheet of paperwork that says exercise price and a sheet of paperwork that says strike price are describing one and the same term of one and the same contract, so a reader who has been shown both has not been shown two things.

The flat statement matters because of what a reader does with the doubt. Somebody who half suspects there are two levels goes looking for the second one. A suspicious reader works through a payoff table trying to decide which of the two figures each column is built on, then reads a description of what the buyer may do at the end and wonders whether the answer changes depending on which word the writer happened to reach for. None of that work has anything to find, and all of it is time spent building a wrong picture of a simple contract.

From here on the shorter form, the strike, does the work, for one reason only: it is shorter. Nothing is implied by the choice. Where a document says exercise price throughout, strike can be read as exercise price throughout, and nothing below changes.

Why would one number ever need two names?

Because two different days are each doing the describing, and each day describes the level in the language that day has available to it.

Take the earlier one. On the day the contract is made, nothing has happened. There is no price to compare against, no decision to take, nobody using anything. All that occurs is that two sides settle on a level and write it down, and the verb for that is struck. The contract was struck at Rs 2,000.00/-, so Rs 2,000.00/- is the strike price. The name records an act of agreement.

Now take the later one. On the end date the contract is no longer being agreed, it is being used or abandoned. If the buyer uses the right, there is a price at which the using happens, and that price is Rs 2,000.00/-. So Rs 2,000.00/- is the exercise price. The name records an act of use.

Two names, two moments, one number, and neither of the two is careless usage that somebody should have tidied away. They came from different rooms. One came from the room where the deal was done and one from the room where it gets settled, and the reason both survived is that both are accurate about the day they belong to.

An everyday version of the same thing exists, and a minute spent on it makes the strangeness disappear altogether. Consider a household booking a hall for a wedding. A booking amount is paid now, and the form records a hall charge of some agreed figure payable on the day itself. At the front of that form the figure sits under a heading reading rate booked. On the sheet the manager reads out on the morning, the same figure sits under a heading reading amount payable on arrival. Two headings. One charge. Everybody standing in that hall can see the two headings were written from two different days, and neither one is wrong about its own day. Nobody in the hall believes there are two charges.

An option contract is exactly that form. An option is an instrumentA contract that can be held, passed on or written, treated as an object in its own right rather than as a private arrangement between two named people. rather than a favour between neighbours, so the two headings got printed in different places by different people, and both stuck. The two words are an accident of history, not a distinction.

And notice why the tidy explanation matters more than it looks. A reader told only that the two are identical, with no account of where the second name came from, will privately conclude that one of them is sloppy and will keep half an eye out for the day it turns out to matter. The suspicion never gets fully put down. Once a reader has seen that the two names come from two dates, the coexistence has been explained rather than merely denied, and nothing is left to be suspicious about.

What is the level itself, and when does it get fixed?

The level is what the buyer choice at the end gets measured against, and it is the amount that changes hands if the right is used. Those two jobs are the whole of it. The shape of what each side owes at every price is a subject in its own right and is covered separately.

The timing is the part worth being precise about. The level is fixed at the moment the contract is made. Not on the end date, not when the buyer decides, not when anybody looks at a screen. On day one it goes into the document and after that it is inert. Everything else about the arrangement can move, and the level is the one term that cannot. The price of the reference asset moves. The payoff moves with it. Either side may change its mind about the arrangement. The level sits there.

One more term of the contract deserves a name here. Whether the right may be used only on the end date, or at any point running up to it, is a matter of the contract's exercise styleWhether a right may be used only on the end date or at any point up to it. Exercise style is a term of a particular contract rather than a feature of options in general.. Every reading here is taken at the end date. On that one day nothing is left to the buyer judgement, and the decision follows from two figures alone. The Securities and Exchange Board of India (SEBI) settles what a listed contract offers, at sebi.gov.in.

Does the exercise price mean what it costs to exercise?

No, and this is the part of the subject worth slowing down for. The word exercise sits next to the word price, and read as ordinary English the pair says what it costs to exercise. The plain English reading is natural, it is what a careful reader with good English will arrive at unaided, and it is wrong in four separate directions at once. Each direction sends a reader off with a different wrong number, so each is worth clearing on its own.

Is it the premium?

It is not. The premium on this contract is Rs 180.00/-, and the writer received that amount at the start, on day one, before anything at all had happened to the reference asset. The premium bought the right, not the reference asset. The premium is the payment for holding a choice, and having been paid, the premium is spent.

So the premium is not the exercise price, and the exercise price is not the premium, and the tell is the date. One of the two amounts moved a year ago. The other one may move at the end, or may not move at all.

Is it the price of the reference asset?

The exercise price is not the price of the reference asset, though care is needed here. The reference asset in this example has a price of Rs 2,000.00/-, and the level is also Rs 2,000.00/-. Two Rs 2,000.00/- figures side by side look like a copying slip and are not one. The agreement was struck level with the price, and a level sitting flush with the price is all that the phrase at the money asserts, so the same figure honestly appears twice. Nobody typed one into the other by mistake, and there is no third number hiding behind either.

Say what each of the two is, and they stop looking alike. The Rs 2,000.00/- price of the reference asset is exposureA quantity of the reference asset that a position amounts to, expressed in money. Exposure is a size, not a bill: nobody has paid it and nobody may ever pay it.: it is the value the contract references, and no party to this contract has paid it. The Rs 2,000.00/- level is a term of the contract: it is the price written in, at which the buyer may buy. One is a measurement of the outside world on a particular day and the other is a clause. The two coincide on day one. The price moves and the clause does not, so they have no reason to stay coincident for a single day afterwards.

Nothing is paid out on the reference asset between the two dates. The asset sits there for the year handing nobody anything, and that matters for the carry arithmetic below.

Is it the forward price of Rs 2,130.00/-?

The exercise price is not the forward price, and this one catches people who have already done some reading. The forward price of the reference asset here is Rs 2,130.00/-. Holding the reference asset for the year costs that much once financing at 6.50 per cent a year is counted, and the figure belongs to an entirely different contract with entirely different obligations. Financing arithmetic is all the forward price contains. Nobody can know where a price finishes, and no term of this call depends on the forward price.

Rs 2,130.00/- is a perfectly real number sitting in the same worked example, and a reader assembling a mental picture out of the figures lying around can easily give it the wrong job. The forward price has a job already, and the job is not this one.

Is it the break-even?

The exercise price is not the break-even. Of the four wrong readings this one does the most damage, and the damage comes from the arithmetic being correct. The premium of Rs 180.00/- added to the level of Rs 2,000.00/- gives Rs 2,180.00/-. Rs 2,180.00/- is a real figure, it means something specific, and it is not an exercise price. Mistaking Rs 2,180.00/- for the exercise price is the single most common way a reader who was paying attention still goes wrong, so the figure gets worked properly below, in a block of its own.

Which amount moves at the start, and which one moves at the end?

With the two amounts set beside each other and their dates attached, the confusion has nowhere left to live. The premium and the level are almost never written in the same place, and that is the only reason the confusion survives. A reader picks up one of them in one spot and the other a long way further on, with no prompt to compare their timing.

The premium of Rs 180.00/- moves at the start. The writer has it and keeps it. Whatever happens next, whether the reference asset soars, sags or sits still, no circumstance whatever brings it back. The premium bought a right, and the right was delivered on the spot.

The level of Rs 2,000.00/- moves at the end, if it moves. The level moves from the buyer to the writer only if the buyer chooses to use the right. And when the level moves, it buys the reference asset itself, a completely different purchase to the one the premium made.

The premium is what it costs to be able to change one's mind, and the level is what gets handed over by somebody who has decided not to.

What happens to the level when the right is not used?

Nothing. The level is never paid. Not a reduced version of it, not a part of it, not a settlement in place of it. The buyer of a call whose reference asset finishes below Rs 2,000.00/- simply walks away. The Rs 2,000.00/- that has been sitting in the contract all year stays exactly where it is, on paper.

An amount carried in the mind as the cost of this position turns out to be an amount that may never move at all. That is the fact that stops the level being a cost and makes it something else: a contingentDepending on something else happening first. A contingent arrangement is one followed only if a particular thing occurs, and it may end up never being followed. amount, owed only in one branch of the future and irrelevant in the other.

Above Rs 2,000.00/- the branch flips. The buyer hands over Rs 2,000.00/-, takes the reference asset, and now the level has done its work as a purchase price. There is no intermediate case: no setting where the buyer hands over some of it, and no setting where the level itself is a different figure.

Work it at the forward price to see both halves of the arithmetic move. At Rs 2,130.00/- the price sits Rs 130.00/- above the level, so the payoff is Rs 130.00/-. Rs 130.00/- is a payoff and not a profit. A payoff counts what the contract hands over and counts nothing whatever that the buyer paid to get there.

Reaching a profit means bringing the premium in, and bringing it in properly. Properly means bringing it to the same date as everything else. Carried across the year, that Rs 180.00/- stands at Rs 191.70/- by the day the choice gets made. Rs 191.70/- taken off a payoff of Rs 130.00/- leaves minus Rs 61.70/-, the amount a buyer is left holding at Rs 2,130.00/-.

The payoff and the profit at one price are two different figures, and only the second of them has counted what the buyer paid. Rs 130.00/- and minus Rs 61.70/- describe the same moment in the same contract, and neither one is an exercise price.

Notice a shape in that arithmetic. Above the level, every extra rupee on the price of the reference asset adds a rupee to the payoff, and the right arm of the line rises one for oneMoving by exactly the same amount as the thing it is measured against. A rupee on one side becomes a rupee on the other, no more and no less.. Below the level nothing happens at all however far the price falls. There is nothing to happen. The buyer is not obliged to do anything, and does not.

Settled elsewhere is how the right is actually used, by what steps, and by what cut-offThe last moment at which an instruction will be accepted. Miss it and the instruction has no effect, however reasonable it was., and whether the end date brings cash or the reference asset. SEBI settles all of that at sebi.gov.in, contract by contract, and the name stands here in place of the answer.

What does the whole contract look like, read at four prices?

Here is the same contract worked end to end, with every figure produced rather than asserted. Rs 2,000.00/- is where the reference asset is priced. The Rs 2,000.00/- price is exposure, the value the contract references, and nobody has paid it. Not one rupee reaches whoever holds the reference asset while the year runs.

The call is struck at Rs 2,000.00/-, matching the price on purpose because the contract is at the money. The premium is Rs 180.00/-, and it is given rather than worked out. Pricing a premium from scratch needs a figure for how far the reference asset might move, and this example carries none, so the Rs 180.00/- is not a quotationA figure somebody is actually offering to deal at, as against a figure written down so that an example can be worked. of anything. Financing is 6.50 per cent a year and the contract runs one year.

Now the two names, worked as sentences. Written from the day the contract was made: the contract is struck at Rs 2,000.00/-, and Rs 2,000.00/- is the strike price. Written from the end date: the buyer exercises at Rs 2,000.00/-, and Rs 2,000.00/- is the exercise price. Same contract. Same number. Two sentences, and only the date they are written from has changed.

The second column matters most here, read downward. At Rs 1,600.00/- and at Rs 2,000.00/- the buyer hands over nothing whatever, and the Rs 2,000.00/- level never moves. At the two prices above it the buyer hands over Rs 2,000.00/-, exactly, in both rows. There is no row anywhere in that table, and no price in between the rows, at which the amount handed over is anything other than nothing or Rs 2,000.00/-.

The profit column runs on the financed premium. Leave Rs 180.00/- with the writer for a year at 6.50 per cent a year, and the amount standing against the buyer on the end date is Rs 191.70/-. Every row in that column has taken off Rs 191.70/-.

Two more readings belong to this contract, and both get printed. The second one is what the block below needs. Ignore the financing on the premium and the buyer is level once the price reaches Rs 2,180.00/-. Count the financing properly and the buyer is level at Rs 2,191.70/-. The two break-even readings differ by the Rs 11.70/- of financing, and the exact one is the larger.

And now the sentence all of this establishes. Not one of Rs 130.00/-, Rs 61.70/-, Rs 2,180.00/-, Rs 2,191.70/- or Rs 2,130.00/- is an exercise price. The exercise price on this contract is Rs 2,000.00/- and nothing else, at every price, on every row, in every column.

Is the settlement price another name for the same thing?

No, and this is the one place in this guide where a different name really does mean a different number. A reader who has just been told that two price words describe one level can very reasonably assume that every price word on the end date describes it too. The assumption is wrong, and it is the confusion a reader would otherwise carry away, so it is worth a block of its own.

On the end date there are two prices in play and they have different jobs. The settlement price is what the reference asset is taken to be worth on that date, arrived at by a stated procedure. The level of Rs 2,000.00/- is what the buyer hands over if the right is used, and it was fixed a year earlier. The choice at the end is made by putting the two beside each other: if the settlement price is above the level, using the right is worth something, and if it is not, it is not.

So the two are not synonyms, they are the two inputs to the same comparison, and a document that ran them together would be describing a contract in which the buyer chooses by comparing a number with itself.

A document using exercise price and strike price for one number is being consistent, and a document using settlement price for either of them is not. That is a usable test to carry into a term sheetA short document setting out the agreed terms of an arrangement before the long form papers are drawn up. A term sheet is where a reader most often meets both of these names within a few lines of each other.: swapping the first pair is fine, swapping in the third word is a real error and worth raising.

How the settlement price is actually arrived at is a procedure belonging to SEBI, sebi.gov.in. No two contracts need share one, and any of them can be revised. The same applies to whether the end date brings cash or deliveryHanding over the thing itself at the end rather than a sum of money standing in for it. of the reference asset. Either route changes what physically happens, and neither touches the level by one paisa.

Where does knowing this actually get used?

At the moment somebody has a document open on one side of the desk and a form to fill on the other. Nothing else is involved. The fields are where the naming either helps or costs money, so walking them one at a time repays the effort.

Start with the level field. Whoever is entering the terms of a contract into a record puts Rs 2,000.00/- in that field, and they put it there whichever of the two names the document in front of them used. A record keeper at a lender writing down what a borrower has arranged does this. So does somebody in a research seat building a picture of what a position amounts to. The field takes one number, and it is the same number under both headings. Enter two levels because the paperwork used two words, and everything downstream of that record describes a contract nobody ever made.

Then comes the amount-paid field, and Rs 180.00/- goes into it. A household reading its own statement gets that field wrong most often, and understandably: the statement shows an amount that has left, and the natural question is whether more is coming. On this contract nothing more is coming unless the right is used. The Rs 180.00/- has gone, it is not owed again, and no part of it comes back.

Then the date fields, and there are two of them. One for the day the contract was made, one for the end date. Filling both kills the confusion permanently. Once every amount on the record has a date beside it, the exercise price stops looking like a cost. Costs have dates, and the only date the Rs 2,000.00/- can have is a conditional one.

Then the quantity field, left blank here. Whoever is turning a per unit figure into a total needs to know what one contract stands for, and that figure is settled elsewhere. Somebody has to go and get it, and the record should show a gap rather than a guess until they do.

Two more fields worth naming for anybody building a record rather than reading one. One field for the payoff at a given price, the amount the contract itself hands over. A separate field for the profit at that price, the payoff with the financed premium already taken off. Two separate fields are the single cheapest protection against this whole class of error. The moment they share a field, somebody will put Rs 130.00/- in it and somebody else will read minus Rs 61.70/-.

Does knowing this change anything anybody should do?

The answer settles a naming question, and a settled naming question is a real thing to have. The answer removes a source of confusion from every document read afterwards, and it ends the search for a second level that was never there. The result is smaller than the length of the treatment suggests, and that is the honest shape of the subject.

A reader may put this down and immediately ask which level they ought to be contracting at. Which level to contract at goes unanswered, and the reason is not caution. Said slowly, the question asks for a view on where the reference asset could end up and on how likely each ending is, and this worked example holds none of that. Nothing was ever recorded as having happened to it. Nobody attached a spread of possible endings to it. There is no run of past prices sitting behind it either. The question also asks for facts about the person asking that are not available here, plus the running cost of keeping such an arrangement open and the cost of unwinding it later. The subject offers a settled vocabulary instead, and the refusal on the choice comes with a reason attached.

One more thing is worth stating bluntly. Understanding how a mechanism works is not a reason to use it. What each side of a contract owes at each price is settled arithmetic. Which price will arrive is a different kind of question, and no arithmetic on the terms of the contract reaches it.

The reference asset, the contract written on it and every figure attached to them are invented.
Educational material. Not advice on any investment, tax, budget or market position.