SEBI circular: New F&O position limits for traders

Why the SEBI circular is being discussed

Reddit threads and trading communities are actively parsing SEBI’s updated framework for futures and options limits. The conversation is centered on how position limits will be calculated, monitored, and phased in across 2024 and 2025. Users are linking SEBI Circular SEBI/HO/MRD/TPD-1/P/CIR/2025/79 and quoting key clauses and tables. A recurring theme is that limits are moving closer to observed cash market activity, rather than staying purely static. Another repeated point is that the changes split into two big buckets: single-stock derivatives and index derivatives. Traders also highlight that some limits are framed per PAN for index options, which directly affects how positions are aggregated. Many posts also bundle these changes with other measures such as weekly expiry restrictions, intraday monitoring, and margin tweaks. The overall tone in discussions is practical, with participants trying to translate the circular language into trading constraints.

MWPL formula change for single-stock derivatives

The most shared change is the revised Market Wide Position Limit (MWPL) computation for single-stock derivatives. As cited in posts, MWPL will be the lower of 15% of the stock’s free float or 65 times the Average Daily Delivery Value (ADDV) in the cash market across exchanges. Alongside that, users repeatedly mention a minimum floor of 10% of free float in the MWPL framework. This is being interpreted as a shift toward liquidity-linked limits, because ADDV is tied to delivered value in the underlying stock. Several traders are comparing the older mental model of MWPL to the new “lower of two” approach to understand which stocks could see tighter headroom. Social posts also stress that this change is not immediate and has a specific start date. The effective date being circulated for the new MWPL approach is October 1, 2025. Because MWPL is central to when a stock enters the ban period, the rule is being watched for its practical impact on ban frequency.

Stock eligibility thresholds being quoted from the circular

Apart from MWPL calculation, Reddit users are also quoting eligibility thresholds referenced in the same discussion stream. One commonly cited condition is that the stock’s median quarter-sigma order size over the last six months should not be less than Rs. 75 lakhs. Posts explain quarter-sigma order size as the order value required to move the price by one-quarter of a standard deviation, based on the circular text shared. Another widely repeated condition is that the MWPL in the stock should not be less than Rs. 1,500 crores on a rolling basis. Users also cite that the market wide position limit of open position in F&O on a stock shall be 20% of the number of shares held by non-promoters, which is the free-float holding. A further threshold discussed is that the Average Daily Delivery Value (ADDV) in the cash market should not be less than Rs. 35 crores in the previous six months on a rolling basis. In threads, these thresholds are treated as filters that can decide which stocks remain viable candidates for derivatives trading. The practical interpretation is that liquidity and depth metrics are being elevated in the eligibility test, not only in the limit calculation.

Single-stock participant caps from October 1, 2025

A separate set of numbers gaining traction is the revised cap on how much different participant categories can hold in a single stock via F&O. Posts state that starting October 1, 2025, individual traders can hold up to 10% of the total allowed limit (MWPL) in a single stock. Proprietary brokers are discussed as having a higher cap of up to 20%. The combined limit for foreign investors (FPIs) and all brokers is cited as being capped at 30%. Traders are interpreting these as concentration controls that sit on top of the market-wide cap. Several users connect these caps to the revised MWPL formula, because the participant percentages will apply on whatever MWPL becomes under the new “lower of two” method. Some discussions focus on how this could affect crowded single-stock option trades, especially near expiries. Others focus on compliance and how brokers may enforce limits at the account level once the rule is live. Across posts, the key takeaway is that October 1, 2025 is the anchor date for the single-stock position cap framework.

Index options: PAN-level net and gross limits

For index options, the most repeated headline numbers are the PAN-level limits. As shared in the context, the net end-of-day FutEq (future equivalent) open interest limit is cited as Rs. 1,500 crore. The gross end-of-day FutEq limit is cited as Rs. 10,000 crore, with users repeating that gross is monitored separately for long delta and short delta. Several posts highlight that these limits apply per PAN and are aimed at aggregating exposure across brokers. Communities also note that SEBI plans a gradual implementation window between July 1 and December 5, 2025, as stated in the social summaries. Another detail cited from the extracted clauses is an intraday framework, with an intraday net position limit (FutEq basis) of Rs. 5,000 crore versus the end-of-day net limit of Rs. 1,500 crore. The intraday gross position limit is also quoted as Rs. 10,000 crore on a FutEq basis. Traders are spending time understanding FutEq and delta-adjusted concepts because index options exposure is not the same as notional. The overall index-options discussion is about how these caps may reshape large, concentrated index option books.

Index futures: participant-wise limits and how they are measured

For index futures, the community is quoting two types of limits from the circular extracts being circulated. One set of posts states that for certain participants, the limit is the higher of a percentage of market-wide open interest (OI) or Rs. 500 crore, with different percentages depending on category. Examples in the discussion include higher of 15% of OI or Rs. 500 crore for FPI Category I, mutual funds, trading members (proprietary), and clients. Other lines cite higher of 10% of OI or Rs. 500 crore for FPI Category II (other than individuals, family offices and corporates), and higher of 5% of OI or Rs. 500 crore for FPI Category II (individuals, family offices and corporates). Separately, users also quote master-circular style language that trading member limits for index futures can be the higher of Rs. 7,500 crore (for trading members) and Rs. 500 crore (for FPIs and mutual funds) or 15% of total OI. Posts also highlight that futures have delta of 1, so notional OI is the same as FutEq OI for futures. Another point repeated is that some limits are measured on a gross notional basis, as noted in the social summary. Because multiple extracts are being shared, traders are cross-checking which limit applies at which entity level and whether it is per exchange or across exchanges.

Timeline and key numbers traders are circulating

The discussion is also heavily timeline-driven, because different provisions start on different dates. Communities are tracking changes that already began in late 2024, plus measures scheduled through 2025. One widely shared rule is the additional Extreme Loss Margin (ELM) of 2% for short options contracts, with applicability stated as November 20, 2024. Posts also mention that the minimum contract value for index derivatives will be raised to Rs. 15 lakhs starting November 20, 2024. Another item frequently mentioned is that stock exchanges will only be allowed to offer weekly expiry contracts on one benchmark index. Separately, users cite intraday position monitoring for equity index derivatives, with exchanges taking at least four position snapshots during the day, applicable from April 1, 2025. The MWPL formula and single-stock caps are repeatedly tied to October 1, 2025. For index options limits, the rollout window being discussed is July 1 to December 5, 2025. Traders are using these dates to plan for margin, liquidity, and compliance changes that could alter strategy sizing.

What market participants are trying to infer from the changes

Across Reddit and social posts, the recurring effort is to translate regulatory language into day-to-day trading constraints. One debate is how often the MWPL will bind under the “65 x ADDV” method for stocks with low delivered value. Another is how the 10% free-float floor interacts with the “lower of two” rule in practical cases. Index traders are focused on the PAN-level nature of index option limits because it changes aggregation and reduces the scope to distribute exposure across brokers. The FutEq and delta-adjusted framework is another focal point, because it changes how option positions are measured against limits compared with notional. Some posts also connect these limits to the regulator’s concern about heightened speculative activity around options on expiry days, which is mentioned alongside measures like additional ELM. The intraday monitoring requirement is being read as a shift from end-of-day policing to real-time risk controls. Participants are also paying attention to the weekly expiry restriction on one benchmark index per exchange, because it can alter where weekly liquidity concentrates. Finally, many discussions conclude with a practical checklist: track effective dates, understand which limit applies at client versus member level, and monitor how exchanges implement snapshots and reporting under the circular.