SEBI's New F&O Rules: Bigger Lots, One Weekly Expiry — What Changed for Retail

Why SEBI moved

The regulator did not act on a hunch. Its own study found that more than nine in ten individual F&O traders were losing money, with aggregate losses running into lakhs of crores and the heaviest concentration of damage on expiry-day options.

The response was a package of measures aimed squarely at reducing speculative churn in index derivatives. Some of it is unpopular. All of it is comprehensible once you see the problem it is aimed at.

What actually changed

1. Contract size raised to roughly Rs 15-20 lakh

This is the change with the largest practical effect. The minimum notional value of an index derivatives contract was raised to the Rs 15-20 lakh band, the first revision in about nine years.

Concretely, one lot now represents about three times the exposure it used to. A trader who previously traded three lots comfortably may now be able to afford one — or none.

Intent: ensure that anyone taking leveraged derivative exposure has the capital to absorb it. Effect: a meaningful slice of small accounts is priced out of index options entirely.

2. One weekly expiry per exchange

Previously there was a weekly expiry almost every day of the week across the various indices — an effectively continuous expiry-day casino.

Now each exchange offers weekly contracts on only one benchmark index. NSE discontinued weekly expiries on Bank Nifty, Nifty Financial Services, Nifty Midcap Select and Nifty Next 50.

Intent: remove the daily expiry-day lottery. Effect: far fewer of the cheap, high-gamma, near-zero-probability options that retail traders were buying in enormous volume.

3. Upfront option premium mandatory

Brokers must collect the option premium from the buyer upfront, closing off intraday leverage on premium that some were extending.

4. Extra margin on expiry-day short options

An additional Extreme Loss Margin applies to short index options on expiry day — the window where a quiet position can be destroyed in minutes by a sharp move.

5. Calendar spread benefit removed on expiry day

Traders could previously offset margin between a near-month and far-month position. On expiry day this offset no longer applies, because the two legs stop behaving as a hedge when one of them is about to disappear.

6. Intraday position limit monitoring

Exchanges now snapshot open positions several times a day rather than checking only at end of day, closing a window in which limits could be exceeded intraday and squared off before anyone noticed.

What this means for a small account

If your trading capital is under a few lakh rupees, index options are now substantially harder to access — and that is deliberate.

The reasonable reactions, in rough order of sense:

Accept the message. The rules exist because the data said this segment was destroying retail capital at scale. If the new lot size prices you out, the rules have arguably done you a favour. Read what SEBI's loss data actually shows before you go looking for a workaround.

Do not chase leverage elsewhere. The instinct after being priced out of one leveraged product is to find another. That instinct has a poor record.

Consider whether you were trading a strategy or a habit. If a larger lot size destroys your approach entirely, the approach was a function of cheap optionality rather than an edge.

Redirect to where a retail investor is actually advantaged. Nobody can compete with you on holding a good business for ten years. Everybody can outcompete you on a two-hour options trade. Our index fund and SIP pieces cover the alternative honestly.

What did NOT change

Stock F&O lot sizes and the equity cash market are untouched. Hedging remains available to those who need it. Institutions and genuine hedgers were never the target — retail speculation on expiry day was.

The bigger picture

There is a reasonable debate about whether it is a regulator's job to protect adults from their own trades. But the framing misses something. SEBI is not banning derivatives. It is raising the price of admission to a game whose own scoreboard showed nine in ten participants losing.

You can still play. You simply have to bring enough capital to survive being wrong — which was always the actual requirement, only now it is written down.

Disclaimer: Derivatives trading involves substantial risk of loss. This article is for education only and does not constitute investment advice. Rules and thresholds are subject to change by SEBI and the exchanges; always verify current norms with your broker.