F&O Ban List Explained: MWPL, the 95% Trigger, the 80% Exit and What You Can Still Do

A stock is in the F&O ban period when the open positions in its derivatives get too close to a ceiling called the market-wide position limit (MWPL). While it is banned, nobody can open new positions in that stock's futures or options, and existing positions can only be reduced. NSE publishes the list every trading day, and on busy days it can run to several stocks.

What MWPL is, and why it exists

MWPL caps the total open interest that all participants together may hold in a single stock's derivatives. It is set per stock and linked to how much of the stock is actually available to trade (its free float) and how much the cash market really handles each day. The aim is simple: derivative positions shouldn't grow so large that the cash market couldn't absorb them if they had to be unwound in a hurry, and no group of participants should be able to dominate a stock through its derivatives.

SEBI's 2025 changes tightened how both sides of that comparison are measured. Open interest for the ban is now counted on a futures-equivalent basis, which weights option positions by their delta rather than their full notional size, and the limit itself is tied more closely to free float and the stock's cash-market delivery volumes. The exchanges publish each stock's limit and current usage daily.

The thresholds

The gap between 95% and 80% is deliberate. Without it, a stock hovering near the limit would flip in and out of the ban every day.

A worked example

Illustrative figures for a stock with an MWPL of 10 crore shares:

Once in, the stock needs open interest to fall a full 15 percentage points before it can leave. During that time OI can only fall, because no one can add positions, so bans often last several sessions.

What you can and can't do

The penalty

If your open interest in a banned stock goes up during the ban, for example because an order meant to close a position opened a new one instead, the exchange charges a penalty on the increase. It is calculated on the value of the increase, within a minimum and a maximum set by the exchange, and collected through your broker. Most brokers block such orders, but not every route catches every case, so double-check order type and quantity when exiting.

Expiry during a ban

Stock derivatives are physically settled. If a banned stock's contracts expire while the ban is on and you still hold an in-the-money option or a future, it settles by delivery of shares like any other expiry. Because you can't roll, the only alternatives are closing before expiry or accepting delivery.

How bans affect chart and OI analysis

• OI readings break down. During a ban, open interest can only fall, so every move looks like covering or unwinding.
• Structure gets distorted. Forced exits hitting the order book produce candles that don't reflect normal supply and demand.
• Liquidity in the derivatives thins. With no new positions, spreads in the stock's options can widen.

For these reasons Zone Terminal treats any stock in the F&O ban as EVENT RISK: it stays visible in amber, but no order blocks, zones or levels are drawn until the ban lifts. The same quarantine applies to abnormal gaps (a move larger than 3.5× the stock's average daily range) and circuit moves. The rule is published on the methodology page.

How stocks get into F&O in the first place

Not every stock has derivatives. SEBI sets eligibility criteria based on the size of the stock's market and how much it really trades, including thresholds on its median quarter-sigma order size, its market-wide position limit and its average daily delivery value in the cash market. Stocks that stop meeting the criteria are moved out of F&O after a notice period: no new far-month contracts are listed, and existing ones run to expiry. New stocks are added when they qualify. The exchange circulars announce both.

That is why the F&O list changes over time. The instrument list on this site is rebuilt from the exchange contract master, so stocks entering or leaving F&O appear or disappear when their contracts do.

Where to check

NSE publishes the ban list for the next session, and each stock's MWPL usage, after the close of every trading day. Stocks above roughly 85-90% usage are worth watching even before they enter the ban. Check the list before planning any stock F&O position, especially if the stock has had a run of heavy open-interest buildup.