Guide · Derivatives and risk · Updated 2026-09-19

Three position limits sit above every derivatives order, and the one that stops you is usually not your own

Traders ask what their position limit is, as though there were one number attached to their account. There is not. There are three ceilings, owned by three different parties, denominated in three different units, and only one of them is visible to you. All three were recut on separate dates and onto separate bases between October 2024 and December 2025, so a page written before that sequence describes a system that no longer exists, and the error is not cosmetic. It gets the direction of the binding constraint backwards.

Three ceilings, and none of them is called your limit

Start with who enforces what, because that decides what you experience at the order window. Your trading member checks the client limit before your order leaves its system, and checks its own limit over an aggregate you cannot see. The exchange and the clearing corporation check the market wide limit after the close.

The market wide level, the ninety five percent entry threshold and the eighty percent release threshold are the subject of a separate guide on the market wide position limit and the ban period. This page is about the two levels above your order rather than the one above the market.

A single stock limit is a share of a scarce supply

A stock has a finite number of shares held by people who are not promoters. That free float is the thing a large derivatives position can squeeze, because the contracts settle against it. So the ceiling on a single stock is denominated in that scarce supply rather than in money.

Since 1 October 2025 the market wide limit for a stock is the lower of fifteen percent of free float and sixty five times the market wide average daily delivery value in quantity terms, subject to a floor of ten percent of free float, recomputed every three months on the rolling three month delivery figure. Every entity level ceiling in that stock is then a stated percentage of that number.

Two things changed at once, and the second is the one that matters for how you trade. The old client ceiling was measured on gross open position in number of shares. The new one is measured on net delta adjusted futures equivalent open interest, computed at portfolio level across all futures and options on that underlying. A client who was short a call and short a put in equal and opposite delta used to consume the old ceiling at the full size of both legs. Under the new measure that same book reads close to zero.

There is a piece of plumbing that proves the change rather than describes it. The monthly file that carried per client position limits in number of shares was discontinued from 1 October 2025, because a client limit that is simply ten percent of a published market wide number no longer needs a file of its own. When a data file is retired, the rule behind it really has gone.

An index limit is denominated in money, because there is no float to divide

The framework says plainly that there are no market wide position limits for index futures contracts, and none for index option contracts either. That is not an oversight. An index has no free float of its own and cannot be cornered the way a stock can, so the risk being managed is concentration and settlement pressure on expiry rather than a squeeze on supply. With no scarce supply to denominate the limit in, it is denominated in rupees, plus a share of whatever open interest the market happens to have.

Read the last two rows of the fourth column together. The client is measured with one instrument and the member with another, over the same positions.

Your member is measured with a different ruler, and almost nobody says so

This is the part that dates most of what is currently published. The entity level index option limit is stated in futures equivalent terms, which is delta adjusted. The trading member limit that sits directly above it, covering the member's proprietary book and all its clients, is stated on a gross notional basis. Both clauses are in the same annexure, two pages apart, and they use different units.

For index futures the difference is harmless, because a futures delta is one and notional and futures equivalent are the same number. For index options it is not harmless at all, because that is where delta does most of its work.

The client tests are comfortable. The net figure is 114.25 crore against a ceiling of 1,500 crore, which is 7.6 percent used. The long side gross figure is 8.1 percent of its ceiling and the short side 9.2 percent. Nothing here is close to anything.

Now measure the same four legs with the member's instrument. Gross notional is 3,950 crore. On an index where fifteen percent of market option open interest sits below the rupee floor, so the floor is the operative ceiling, that is 52.7 percent of the member's entire limit, consumed by one client. Two clients of this shape put the member at 105.3 percent while each of them remains under 8 percent of their own.

The ratio is the point. The same book reads 114.25 on your ruler and 3,950 on your member's, a factor of about 35. Every hedge you add compresses the first number and leaves the second alone. A trader who builds a carefully offsetting structure to stay inside their limit has, from the member's side of the glass, made the problem larger.

SEBI has named this mismatch itself. A consultation paper issued on 4 December 2025 proposed moving trading member index option limits onto the same futures equivalent basis as clients, with a slab of absolute limits keyed to the average daily market wide futures equivalent open interest of the previous quarter, running from ₹2,000 crore at the low end to ₹12,000 crore at the high end, and the member taking the higher of that slab figure or fifteen percent of market wide futures equivalent open interest. Comments closed on 26 December 2025. Check whether it has since been notified before you rely on the current split, because the whole shape of the member ceiling changes if it is.

The binding constraint is usually not yours

Take a single stock in the second illustrative quarter above, where the market wide limit works out at 6,17,50,000 shares. The client ceiling is ten percent of that, 61,75,000 shares. The combined member ceiling is thirty percent, 1,85,25,000 shares.

Your next order in that stock is refused, and the rejection message will tell you nothing about why, because the reason is an aggregate you are not entitled to see.

There is a further turn of the screw in who pays. The monetary penalty for a position limit violation by any entity is charged to the clearing member, not to the client who caused it. A member therefore has a direct financial reason to stop you well before the published ceiling, at an internal buffer it sets for itself and does not publish. That buffer is the real limit on your account, and no circular specifies it.

Gross or net, and what a hedge actually buys

There is no single answer to whether limits are gross or net, which is why the question produces so much confusion. It changes by product and by level, in ways that are internally consistent once you see what each level protects.

The second row deserves a moment. At market level each participant's net position is computed first, then those nets are added. A perfectly offset book contributes nothing, which is the reform that removed a class of spurious ban periods. But the addition across participants is gross: your long and my short are both consumption, and neither cancels the other.

The fourth row traps funds rather than individuals. Index futures limits are measured on gross notional value, netted at the level of a client, a foreign portfolio investor, a proprietary book or an individual scheme, and added gross across the schemes of one mutual fund. Two schemes of the same fund holding opposite index futures consume the fund's ceiling twice over, while a single client running the identical pair consumes nothing.

What actually happens when a limit binds

Three separate things, at three separate points in the day, and only one of them refuses anything.

What is refused. Your member's pre trade risk check, and only that. The exchange does not reject an index derivatives order for a position limit; it measures. For a single stock in a ban period the exchange does refuse orders that would increase open interest, which is a different mechanism and is covered in the ban period guide.

What is permitted. Reducing and closing, always. A position that drifted over because the base moved rather than because you traded. And, for entities with the reporting machinery, exposure above the stated index ceilings where holdings back it.

What is penalised. The end of day test, and on option expiry days the intraday snapshots as well. The intraday ceiling is not the same number as the end of day one: from 1 October 2025 the intraday net figure for index options is ₹5,000 crore against an end of day net figure of ₹1,500 crore, with the gross figure ₹10,000 crore on both. Intraday you may run more than three times the net delta you are allowed to carry home. For index derivatives the consequence is an additional surveillance deposit equivalent to the margin chargeable on the excess position, retained for one month. Since 8 December 2025 an intraday breach on an option expiry day draws that deposit at one and a half times the computed amount, and where the breach observed in the cure period snapshot exceeds the original snapshot, the cure period figure is the one used. For single stocks the consequence is a per day monetary penalty on the clearing member.

Look at the first row. A breach of 10,25,000 shares carries the same daily penalty as a breach of about 15,625 shares, because the cap bites long before the excess becomes large. The fine is not the deterrent. The deterrent is the member's refusal, set at a buffer chosen precisely because the fine lands on the member.

The limit is a limit on unbacked exposure, not on exposure

The index ceilings are not the top of what an entity may hold. Above them sits a separate permission: aggregate short index exposure may run up to the value of stocks held, and aggregate long index exposure up to holdings of cash, cash equivalents, government securities and treasury bills, with the cash side reported through the clearing member and the stock side sourced from the depositories. The stated figures are therefore a limit on exposure that nothing backs. An entity that reports holdings has a ceiling that moves with its balance sheet; an entity that does not has a fixed one.

For an ordinary account this is theory, because that reporting runs through custodians on institutional timetables. The practical reading for an individual is that the index ceilings are hard, the single stock ceiling is the one that will ever bind, and the member ceiling is the one that will bind first.

The base moves, so a compliant position becomes non-compliant without a trade

This is the failure mode generic pages leave out entirely, and it follows directly from how the limits are written. Not one of the three ceilings is a fixed quantity. Each is a percentage of something that is recomputed on a schedule you do not control.

Work the illustrative stock through. Free float is 60,00,00,000 shares, so the fifteen percent leg is 9,00,00,000 shares and the floor is 6,00,00,000 shares. In the first quarter, delivery of 16,00,000 shares a day makes the sixty five times leg 10,40,00,000 shares, so the free float leg binds, the market wide limit is 9,00,00,000 shares and your ceiling is a tenth of that, 90,00,000 shares, or 7,200 lots.

Three months later delivery has fallen to 9,50,000 shares a day. Sixty five times that is 6,17,50,000 shares, now below the free float leg and above the floor, so the limit becomes 6,17,50,000 shares and your ceiling 61,75,000 shares, or 4,940 lots. You have lost 2,260 lots of permission without placing an order. A position of 72,00,000 shares, 5,760 lots, was at 80.0 percent of the ceiling and is now at 116.6 percent, an excess of 10,25,000 shares. Nothing was traded. The formula was recomputed.

That illustration is not an extreme case, and it can be measured rather than asserted. Take the exchange delivery records for the two three month windows the formula itself would have used for the recuts effective 1 July 2026 and 1 October 2026, and take the 237 most actively traded cash market stocks as a proxy for the derivatives eligible list. Across them, average daily delivery quantity between consecutive quarters moved by a median of 25 percent.

Read that against the formula. The sixty five times delivery leg of the market wide limit moves with those numbers, and where that leg is the binding one rather than the free float leg, every ceiling stated as a percentage of the limit moves with it. Half the sample would have seen that leg fall by a tenth or more at a single recut. This measures the delivery leg only, on one exchange's records, and a given stock's ceiling moves this way only while the delivery leg is the one that binds. It is enough to establish the shape of the problem: the denominator is not stable, and it resets on a date printed in advance.

There are three ways this happens, and they have different rhythms.

One. The quarterly recut. The market wide limit is recomputed every three months on the latest free float and the preceding three months of delivery value, and disseminated before the quarter starts. Anything expressed as a percentage of it steps on the same date.

Two. Yesterday's market open interest. Index limits expressed as a share of market open interest are monitored against the total at the end of the previous day's trade. If market open interest falls, an unchanged position is a larger share of it this morning than it was last night. The framework states that such passive breaches are not violations, which is an admission that they occur.

Three. Delta drift. Your own futures equivalent position is a function of deltas, and deltas move with the underlying and with time. A short option book that was comfortably inside a net ceiling on Friday can be outside it on Monday because the index gapped, with no order in between. The same carve out applies where the increase comes only from the underlying moving, and a rise caused by near month contracts expiring is treated as passive too.

The carve outs are narrower than they sound. They protect you from the base moving. They do not protect a position you chose to keep once you knew the base had moved, and the window in which you are expected to notice is one trading day. Lot size revisions add a fourth moving part, since a ceiling stated in shares translates into a different number of lots after each revision; that mechanism has its own guide.

What the three levels are actually for

Each ceiling answers a different question, and reading them as three versions of one idea is what produces the confusion. The market wide limit asks whether the derivatives market in one stock has grown large relative to the shares actually available and actually changing hands: a question about the underlying, which is why its base is free float and delivery and why it exists only for single stocks. The member limit asks whether any one intermediary has become a concentration of risk the clearing system would have to absorb if it failed: a question about the plumbing, which is why the penalty lands on the clearing member and why it binds on you without explanation. The client limit asks whether any one participant has become large enough to move what it is trading, and it is the only one of the three most published material discusses.

The discipline that follows is short. Know which of the three you are near, because the answer is almost never the one you would guess. Know the basis each uses, because a hedge that helps under one is invisible under another. And treat every ceiling as a moving number with a recomputation date, not a line you can sit against. Sizing that leaves no room for the denominator to change is not sizing; it is a bet that the formula will hold still, and sizing from first principles starts from the opposite assumption.