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Weekly Expiry

A weekly expiry option is a short-dated contract that expires every week on the exchange's designated expiry weekday — currently Tuesday for Nifty on NSE and Thursday for Sensex on BSE.

Quick answer: A weekly expiry option is a short-dated contract that expires every week on the exchange's designated expiry weekday — currently Tuesday for Nifty on NSE and Thursday for Sensex on BSE.

In simple words

Weekly options are just options with a very short life — about a week or less. A fresh weekly series is listed and expires every week, so at any time you can trade an option expiring in a few days. Because they have so little time left, weekly options are cheap, decay quickly, and move fast — which makes them popular for short-term trading and dangerous for the unprepared.

Purpose

Weekly expiries let traders take precise, short-horizon positions and hedge around specific near-term events (a policy decision, results, data) without paying for a full month of time value. They concentrate liquidity and are the workhorse of India's index-options market.

Visual explanation

Weekly Expiry

A weekly contract expires every week; a monthly contract expires once a month on the last expiry weekday.

wk 1wk 2wk 3wk 4wk 5last TueWeekly expiryexpires every weekMonthly expiryone expiry per month

Professional explanation

Which instruments have weekly expiry

After SEBI's 2024 rationalisation, each exchange offers weekly expiry on just one benchmark index. On NSE that is the Nifty 50; on BSE it is the Sensex. Bank Nifty, FinNifty, Nifty Midcap Select and Nifty Next 50 no longer have weekly options — they are monthly-only. This consolidation was designed to reduce the number of high-risk expiry days.

The current expiry weekday (and why it keeps changing)

As of September 2025, all NSE derivatives — including Nifty weeklies — expire on Tuesday, and all BSE derivatives — including Sensex weeklies — expire on Thursday. This has been revised several times (Nifty weeklies were on Thursday for years, briefly proposed for other days, then settled on Tuesday). Always confirm the current weekday on the exchange website, because the rule, not the concept, is what changes.

Why weeklies decay and move so fast

With only days of life left, a weekly option's time value is small and evaporates quickly — theta is high. At the same time, an at-the-money weekly has very high gamma near expiry, so its delta (and therefore its price) swings violently on small index moves. This combination is what makes weekly expiry day feel so different from a normal trading day.

Practical example (Nifty / Bank Nifty)

Illustrative — Nifty spot 25,000, lot size 75

It is Wednesday and the Nifty weekly (expiring next Tuesday) 25,000 CE is trading at ₹110 with Nifty at 25,000. Six calendar days of time value are packed into that ₹110. If Nifty simply sits still, that call could decay to ₹40–₹50 by Monday and to near its intrinsic value by Tuesday's close — the same 'nothing happened' that barely dents a monthly option can halve a weekly.

On the Sensex (BSE), the equivalent weekly expires on Thursday instead of Tuesday — so an Indian trader can find an index weekly expiring on two different weekdays depending on whether they trade NSE's Nifty or BSE's Sensex.

Advantages

  • Cheap to buy — low time value means small premium outlay for a short-term view.
  • High capital efficiency for defined-risk, short-horizon trades and event hedges.
  • Very liquid for Nifty and Sensex, with tight spreads at and around the money.

Limitations

  • Brutal time decay — a quiet week can wipe out a long weekly's value.
  • Extreme gamma near expiry makes short weeklies dangerous; small moves cause large, fast losses.
  • Only available on one index per exchange, so weekly hedging of Bank Nifty or FinNifty is no longer possible.

Why it matters in practice

  • Match the weekly to your horizon — do not buy a weekly for a view that needs a month to play out.
  • Respect that a weekly's biggest enemy as a buyer is a quiet market, not just a wrong direction.
  • If selling weeklies, size for the gamma risk of expiry day, when losses accelerate fastest.
  • Check the exact expiry weekday on your exchange — Nifty and Sensex differ.

Common mistakes

  • Treating a weekly like a monthly and being shocked by how fast it decays.
  • Buying an out-of-the-money weekly and expecting it to move much before the index actually gets there.
  • Selling naked weeklies without appreciating the gamma explosion on expiry day.
  • Assuming Bank Nifty still has a weekly expiry — it does not since November 2024.

Professional usage

Professionals use weeklies surgically — to express a precise short-term view, to hedge a specific event cheaply, or to harvest theta with strictly defined risk. They are acutely aware of the gamma profile into expiry and often reduce or close short-gamma weekly positions before the final hours rather than ride the most violent part of the decay.

Key takeaways

  • Weekly options expire every week — on Tuesday for Nifty (NSE) and Thursday for Sensex (BSE) under current rules.
  • They are cheap but decay and swing fast; high theta and, near expiry, high gamma.
  • Only Nifty and Sensex have weeklies; Bank Nifty and FinNifty are monthly-only since November 2024.

Frequently asked questions

What is weekly expiry in options?
Weekly expiry means the option contract expires every week on the exchange's expiry weekday. It is a short-dated contract with only days of life, used for short-term trading and event hedging.
Which day is the weekly expiry in India?
As of September 2025, Nifty weeklies (NSE) expire on Tuesday and Sensex weeklies (BSE) expire on Thursday. This has changed before, so verify the current weekday on the exchange website.
Does Bank Nifty have a weekly expiry?
No. NSE discontinued Bank Nifty weekly options in November 2024. Bank Nifty now has only monthly (and quarterly) expiry, on the last Tuesday of the month.
Why are weekly options cheaper than monthly options?
Because they have far less time value. With only days until expiry, there is little time for the underlying to move, so the extrinsic (time) portion of the premium is small.
Why do weekly options lose value so quickly?
Because time decay (theta) is fastest when little time remains. Each passing day removes a large share of a weekly's small time value, so it decays much faster than a monthly option.
Are weekly options good for beginners?
They are risky for beginners. Their speed and rapid decay can produce fast losses. Beginners are usually better served understanding time decay and gamma on longer-dated options first.
Which index options have weekly expiry now?
Only Nifty 50 on NSE and Sensex on BSE. All other index and stock derivatives are monthly-only after the 2024 rationalisation.
Can I sell (write) weekly options?
Yes, and many income traders do to collect fast theta. But short weeklies carry very high gamma risk near expiry, so a sudden move can cause large, accelerating losses. This is educational information, not advice.
How many days does a weekly option last?
Up to about a week. A new weekly series is listed each week, so at any time the nearest weekly is a few days from expiry and the next is a few days further out.
What is the difference between weekly and monthly expiry?
Weekly options expire every week and decay fast; monthly options expire once a month on the last expiry weekday, hold more time value, and decay more slowly. Monthlies suit longer views; weeklies suit short horizons.
Do weekly and monthly expiries ever fall on the same day?
Yes. On the last expiry weekday of the month, that week's weekly contract and the monthly contract expire together — a particularly active expiry day.
Why did SEBI reduce the number of weekly expiries?
To limit excessive speculation and the risks of frequent high-volatility expiry days. Restricting weeklies to one benchmark index per exchange reduces the number of expiry days and their associated churn.

Voice search & related questions

Natural-language questions people ask about Weekly Expiry.

When does the Nifty weekly expire?
Under current rules Nifty weekly options expire every Tuesday. Confirm on NSE, as the expiry weekday has been changed before.
Why is my weekly option losing money even though the market isn't moving?
Because of time decay. A weekly option's time value shrinks every day, so a flat market still eats into a long weekly's price — that is theta at work.
Can I still trade Bank Nifty weekly options?
No, Bank Nifty weekly options were discontinued in November 2024. Only monthly Bank Nifty options remain, expiring on the last Tuesday of the month.
Are weekly options more risky than monthly?
Yes, generally. They decay faster and, near expiry, have much higher gamma, so their price swings more sharply on small moves in the index.
What is the cheapest option to buy for a quick trade?
Short-dated weekly options have the lowest premiums because they carry little time value, but that cheapness comes with very fast decay if the move does not happen quickly.

Sources & references

Last reviewed 11 July 2026. Educational content only — not investment advice. Exchange rules change; verify current conventions on NSE/BSE.

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Educational content only — not investment advice. Examples use illustrative numbers and current exchange conventions that may change. Options and futures involve substantial risk. See our Risk Disclosure and SEBI Disclaimer.