Trading Risk: Position Limits and Open Interest
Why this page is structured this way: A position-limit question decomposes into three — who is the entity, how is exposure measured, which ceiling applies. The page follows that order: entity categories, futures-equivalent measurement, the three limit families, ban-period behaviour, then breach handling and evidence. All numbers sit in one table so a ceiling can be looked up without reading the narrative.
- Exposure is measured in futures-equivalent terms, using signed deltas. SEBI/HO/MRD/TPD-1/P/CIR/2025/79 (May 29, 2025), paragraph 5.1, replaced notional-contract counting — SEBI-MRD circulars index
[not yet in index]. It is not the sum of contracts, premium turnover or every leg’s notional. - Market-wide position limit is the lower of 15 percent of free float and 65 times average daily delivery value, floored at 10 percent of free float, recalculated quarterly from the rolling preceding three months (paragraph 5.2). The legacy 20-percent-of-free-float formula must not be presented as current.
- A stock enters ban when end-of-day market-wide futures-equivalent open interest exceeds 95 percent of the market-wide limit (paragraph 5.2.6). During the ban, trading must reduce end-of-day exposure without crossing zero into the opposite sign, so a delta-reducing hedge is permitted.
- Single-stock ceilings by category: client and NRI 10 percent of the market-wide limit; trading-member proprietary 20 percent; proprietary plus clients, Category I FPI and mutual fund 30 percent; Category II FPI 20 percent, with individuals, family offices and corporates at 10 percent (paragraph 5.8).
- Index option ceilings are three separate tests. End of day: net ₹1,500 crore futures-equivalent, gross ₹10,000 crore each side. Intraday: net ₹5,000 crore, gross ₹10,000 crore each side, under SEBI/HO/MRD/TPD/CIR/P/2025/ 122 (September 1, 2025) —
[not yet in index]. - Margin and position limits are independent tests. More collateral does not raise a position ceiling, and one client’s collateral cannot support another — see the client-level collateral segregation framework.
Conceptual overview
Section titled “Conceptual overview”A position limit answers a different question from a margin requirement. Margin asks whether a client has posted enough to absorb a plausible loss; a position limit asks whether the position should exist at all, however well collateralised. The two run independently, which is why a well-funded client can be refused an order and why a broker cannot cure a limit breach by asking for more money.
Indian equity derivatives run three families of limit. The market-wide limit caps how much of a single stock’s derivative open interest the whole market may hold; when it is nearly exhausted the stock enters a ban period in which participants may only reduce exposure. Entity-category limits cap what one client, NRI, foreign portfolio investor, mutual fund or trading member may hold in a single stock. Index limits cap index futures and index options exposure; since 2025 the index-option ceilings are stated in rupees of futures-equivalent exposure and tested three ways, with a separate, higher intraday net ceiling monitored by random snapshots.
The measurement change is the part most likely to break an existing implementation. Futures-equivalent exposure signs the position: a long future contributes positively, a long call its positive delta, a long put its negative delta, and short positions reverse the corresponding long’s sign. For the market-wide computation the May 2025 circular describes a gross addition of the net futures-equivalent exposures computed at UCC level. A system that previously summed absolute notional values will produce a different — and non-compliant — answer.
The market-wide limit and the graded or additional surveillance measures are related but distinct; the surveillance stack, and the older market-wide-limit summary, are in the surveillance norms deep dive. This page carries the current framework and the breach workflow.
1. Regulatory framework
Section titled “1. Regulatory framework”- SEBI/HO/MRD/TPD-1/P/CIR/2025/79 (May 29, 2025), “Measures for Enhancing Trading Convenience and Strengthening Risk Monitoring in Equity Derivatives” — paragraphs 5.1 to 5.5 and 5.8 establish futures-equivalent measurement, the recalibrated market-wide limit, ban-period behaviour, index limits and the entity-category tables; paragraph 6 carries the implementation sequence, single-stock category limits effective October 2025. SEBI-MRD circulars index.
- SEBI/HO/MRD/TPD/CIR/P/2025/ 122 (September 1, 2025), “Framework for Intraday Position Limits Monitoring for Equity Index Derivatives” — paragraphs 4 to 6 establish intraday index-option ceilings, snapshot requirements, the holdings-backed additional-exposure route and breach reporting.. Expressly limited to index options; do not copy it to futures or single stocks.
- SEBI/HO/MRD/TPD-1/P/CIR/2025/41 (March 28, 2025), “Intraday Monitoring of Position Limits for Index Derivatives” — the interim arrangement, read only together with the later May and September instruments..
- SEBI/HO/MRD/MRD-PoD-2/P/CIR/2024/140 (October 15, 2024), “Monitoring of position limits for equity derivative segment” — identifier, title and date verified from the SEBI landing page; clause detail not retrieved, so
[verify clauses before acting].. - SEBI/HO/MRD/TPD/P/CIR/2024/132 (October 1, 2024) — the original intraday position-monitoring measure among the six October 2024 reforms.
- Chapter 5, Exchange Traded Derivatives (December 30, 2024, SEBI master chapter) — retained baseline mechanics, including the ban-exit test at aggregate open interest of 80 percent or below. The market-wide formula and the old client percentages in it were replaced by the May 2025 circular.
- SEBI/HO/MRD2_DCAP/CIR/2021/0598 (July 20, 2021) — client-level collateral segregation, which prevents one client’s surplus from supporting another’s exposure.
- NCL/CMPT/66597 (February 10, 2025) and NCL/CMPT/63762 (September 5, 2024) — representative per-security notices revising market-wide, participant, institutional and non-institutional client limits: the operational source for the number applying to a given stock.
- BSE notice 20230106-56 (January 6, 2023) — penalty structure for position-limit violations in the equity and currency derivatives segments. The NSE counterpart sits in the Surveillance and Investigation Consolidated Circular NSE/SURV/74008 (April 30, 2026).
- Securities and Exchange Board of India (Stock Brokers) Regulations, 2026 (notified January 7, 2026) — the framework within which a member’s monitoring obligation sits.
2. Entity categories — the aggregation question first
Section titled “2. Entity categories — the aggregation question first”Limits apply to a regulatory identity, not a login. Before any exposure number is computed, the account must be classified, and the classification reconciled with the registered status rather than selected.
| Category | Why it is separate | Aggregation note |
|---|---|---|
| Client (resident) | Base non-institutional ceiling | All PAN-linked accounts aggregate, across brokers |
| NRI | Client percentage, own custodial arrangements | See the NRI deep dive |
| Trading member, proprietary | Own book, distinct ceiling | Visible separately on the member dashboard |
| Trading member, proprietary plus clients | Aggregate member book | Its own test, not the sum of two compliant numbers |
| Category I FPI | Institutional treatment | Custodian-reported |
| Category II FPI | Lower ceiling than Category I | Individuals, family offices and corporates take the client percentage |
| Mutual fund | Institutional treatment | Scheme- and fund-level rules interact |
Ambiguous classification should be rejected, not resolved by applying the most generous limit. Two clients holding opposite positions are two entities: neither their exposures nor their collateral pools net.
3. Measuring exposure
Section titled “3. Measuring exposure”- Import the inputs. Contract quantities, lot multipliers, underlying prices and clearing delta values, each stamped with the timestamp they belong to.
- Sign the legs. Long future positive; long call positive delta; long put negative delta; short call and short put reverse the corresponding long sign.
- Compute the required measures. Net futures-equivalent exposure and, where the rule demands them, gross long and gross short as separate figures.
- Reconcile against clearing output. A missing delta or stale underlying price is a reconciliation exception, not rounding to be dismissed when a threshold is near.
- Keep units consistent. A share count and a rupee ceiling cannot be compared without explicit conversion, and the market-wide denominator should be taken from the clearing corporation’s published figure rather than reconstructed.
4. The ceilings
Section titled “4. The ceilings”| Limit or trigger | Figure | Source |
|---|---|---|
| Market-wide position limit | Greater of (10 percent of free float) and the lesser of (15 percent of free float) and (65 times average daily delivery value) | May 2025, 5.2 |
| Market-wide recalculation | Quarterly, from rolling preceding three months’ average daily delivery value | May 2025, 5.2 |
| Ban entry | End-of-day market-wide futures-equivalent open interest above 95 percent of the limit | May 2025, 5.2.6 |
| Ban exit (retained baseline) | Aggregate open interest down to 80 percent or below; confirm the current procedure for the futures-equivalent basis | Dec 2024 master chapter |
| Single stock — client, NRI | 10 percent of market-wide limit | May 2025, 5.8 |
| Single stock — TM proprietary | 20 percent | May 2025, 5.8 |
| Single stock — proprietary plus clients, Category I FPI, mutual fund | 30 percent | May 2025, 5.8 |
| Single stock — Category II FPI | 20 percent; individuals, family offices and corporates 10 percent | May 2025, 5.8 |
| Index futures — Category I FPI, mutual fund, TM proprietary, clients | Higher of 15 percent of futures open interest and ₹500 crore | May 2025, 5.5.2 |
| Index futures — Category II FPI | Higher of 10 percent and ₹500 crore; individuals, family offices and corporates higher of 5 percent and ₹500 crore | May 2025, 5.5.2 |
| Index options — end of day | Net ₹1,500 crore; gross long and gross short ₹10,000 crore each | May 2025, 5.5.1 |
| Index options — intraday | Net ₹5,000 crore; gross ₹10,000 crore each side | Sep 2025, 4.1–4.2 |
| Intraday snapshots | Four random minimum; one between 14:45 and 15:30 | Sep 2025, 4.3 |
| Normal enforcement | December 6, 2025, after the July 1 to December 5, 2025 glide path | May and Sep 2025 |
Index futures limits are measured on gross notional; the index-option ceilings and the market-wide formula depend on delta-equivalent exposure. Both can be retained internally to explain a portfolio, but only the prescribed measure decides each test.
5. Ban period — what is and is not permitted
Section titled “5. Ban period — what is and is not permitted”When a stock enters ban, permitted trading is trading that reduces end-of-day futures-equivalent exposure without a sign change.
- Closing an existing contract reduces exposure and is the ordinary route.
- Adding a delta-reducing hedge is permitted under the May 2025 formulation, which gives an option hedge as an example. A blanket “no new contracts during a ban” statement is therefore an inaccurate description of the rule — though a broker may impose it as policy, and should label it so.
- Crossing the sign is not permitted: reducing a long book to zero is allowed; turning it into an equivalent short book is not.
- A passive increase caused by underlying price movement is distinguished from an active increase caused by trading, and must be attributed before it is treated as a breach.
- The one-day position-reduction facilitation in paragraph 5.5.4 is expressly not permission to take speculative exposure above the limit.
Intraday market-wide monitoring — at least four random observations for surveillance — is not the end-of-day ban-entry test. A stock can show high utilisation at 11:00 and not enter ban.
6. Breach handling and evidence
Section titled “6. Breach handling and evidence”- Classify the breach. Which entity, limit family and measure (net, gross long, gross short); intraday or end of day; active or passive.
- Reduce, and record. Capture orders, fills, residual exposure and time. A reduction before the close does not erase an intraday expiry-day breach.
- Retain the rationale and related trading. Paragraphs 4.5 to 4.7 of the September 2025 framework expect trade rationale and constituent-security movements to be kept for surveillance.
- If additional exposure is claimed against holdings, validate stock holdings for short-direction exposure and eligible cash or cash equivalents for long-direction exposure, and report them under the applicable procedure. A balance screenshot is not evidence.
- Expect two penalty streams. Exchange position-limit penalties, and the expiry-day additional-deposit framework operative from December 6, 2025, are distinct from client margin-shortfall penalties — see margin shortfall and peak margin.
- Close the day. Reconcile reported and internal exposures, the next-session ban list and the client restrictions that follow. The 2025 glide path is historical after December 5, 2025.
7. Field-level record — position-limit computation
Section titled “7. Field-level record — position-limit computation”Internal analytical labels; feed filenames and widths are [unknown — verify] pending the current member interface specification and the joint monitoring standard operating procedure.
| name | type | length | mandatory | source-system | destination-system(s) | notes |
|---|---|---|---|---|---|---|
| PAN | string | 10 | Yes | Client master | Entity aggregator | Regulatory identity, not a platform login |
| UCC | string | [unknown — verify] | Yes | Exchange master | Entity aggregator | Several UCCs can map to one PAN |
| Entity category | enum | [unknown — verify] | Yes | Registration records | Limit engine | Client, NRI, FPI I or II, TM proprietary, aggregate TM, mutual fund |
| Underlying and instrument class | identifiers | [unknown — verify] | Yes | Contract master | Risk computation | Futures and options measured under different rules |
| Position quantity and signed delta | integer, decimal | [unknown — verify] | Yes | Cleared positions, clearing data | Exposure engine | Per contract, per side; retain the option sign convention |
| Underlying price and valuation timestamp | decimal, timestamp | [unknown — verify] | Yes | Market data, exchange | Intraday limit monitor | Snapshot-price rule applies |
| Net, gross long and gross short futures-equivalent | decimals | [unknown — verify] | Yes | Exposure engine | Limit monitor | Three independent index-option tests |
| Market-wide limit and market futures-equivalent open interest | decimals | [unknown — verify] | Stock limits | Exchange, clearing corporation | Limit and ban checks | Store units with business date |
| Prior end-of-day exposure and passive-change attribution | decimals | [unknown — verify] | Ban checks | Position history, market data | Breach investigation | Baseline for the reduce-only test; separates price movement from trading |
| Additional-exposure backing reference | asset references | [unknown — verify] | Conditional | Custodian, bank, depository | Regulatory reporting | Reporting layout not obtained |
8. Alternatives
Section titled “8. Alternatives”| Option A | Option B | When to pick which | Who uses what |
|---|---|---|---|
| Gross notional measurement | Futures-equivalent (delta) measurement | Not a preference: index futures limits use gross notional; index-option ceilings and the market-wide formula use delta-equivalent exposure | Both retained internally; only the prescribed one decides the test |
| Close the position during a ban | Add a delta-reducing hedge during a ban | Closing is always compliant; a hedge is permitted where it reduces end-of-day delta without a sign change | Positional books hedge; retail is usually restricted to closing |
| Stay within the ordinary limit | Report holdings-backed additional exposure | The second needs the defined conditions, evidence and reporting; it is not a way to assign arbitrary cash | Institutional and hedging books |
| Monitor at end of day | Monitor intraday as well | Both are mandatory; intraday compliance does not imply end-of-day compliance | Compliance and surveillance desks |
Practical notes
Section titled “Practical notes”- [gotcha] The September 2025 intraday net allowance of ₹5,000 crore does not replace the ₹1,500 crore end-of-day figure. Two ceilings, two tests.
- [gotcha] The December 2024 master chapter’s 20-percent-of-free-float formula and its older client percentages are historical for the parts the May 2025 circular replaced. Quoting them as current is the likeliest sourcing error on this topic.
- [gotcha] Opposite-sign positions held by two clients are not one portfolio, and neither is their collateral. Aggregation follows the prescribed identity.
- [risk trade-off] A portfolio with near-zero net delta can still breach a gross-side ceiling; publish all three index-option measures in any review example.
- [industry practice] Brokers commonly apply a stricter internal ceiling and block fresh positions in banned stocks outright rather than assessing whether a trade is delta-reducing. Label it broker policy.
[industry practice — unverified]as a universal pattern. - [gotcha] Commodity derivatives run a separate framework. SEBI revised it on September 9, 2026 — HO/47/16/13(5)2026-MRD-POD1/ I/20735/2026 on the SEBI-MRD circulars index, forwarded as MCX/S&I/513/2026 — capping penalties at ₹2 lakh for breaches above 2 percent and ₹10,000 for breaches up to 2 percent, with client limits of 2, 1 and 0.5 percent of deliverable supply for broad, narrow and sensitive commodities. Do not extend the equity tables into commodities or the reverse.
Cross-references
Section titled “Cross-references”- Deep Dive: Surveillance norms, GSM and ASM — the surveillance stack and the earlier market-wide-limit summary.
- Deep Dive: Segment rules comparison — the per-segment position-limit baseline.
- Deep Dive: RMS and SPAN methodology — why margin capacity and position permission are separate computations.
- Deep Dive: SLBM — lending position limits, also expressed against the market-wide limit.
- Field atlas: computed surveillance — limit-monitoring field destinations.
- Appendix: NRI deep dive — the NRI category’s custodial and limit particulars.
- Expiry-day operations — where intraday monitoring and expiry-day penalties bite.
- Collateral and cross-margin — the independent margin-capacity test.
- Persona: OMS and RMS head — the reading path this page belongs to.
Verified through
Section titled “Verified through”2026-09-11
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