Expiry Day Analysis — 22 Jul 2026
What to watch, what to trade, and what to avoid on weekly and monthly expiry days. Rollover data, historical expiry-day moves, and current cycle positioning.
Expiry days are the highest-volume, highest-volatility trading days in Indian markets. The dynamics on expiry day are fundamentally different from any other day — positions unwind, gamma exposure compresses, and the option chain anchors to specific strikes. Traders who understand the mechanics make systematic edge; those who don't get chopped up.
Strota's expiry day page covers the current NSE index expiries — NIFTY's weekly on Tuesday, plus the monthly contracts (BANK NIFTY, FIN NIFTY, MIDCAP NIFTY and single stocks) that all settle on the last Tuesday — and the BSE's SENSEX weekly on Thursday. Daily rollover data, the current cycle's positioning, and a historical lookback on how prior expiries played out.
This is an educational and analytical page, not a forecasting service. The point is to make the structure of expiry day visible so you can build your own setup around it.
The current expiry calendar and patterns
NIFTY 50 — weekly, Tuesday (NSE). The biggest by volume and the NSE's only surviving weekly index option. Max pain gravity is moderate; pinning to the highest-OI strike is common in the last hour. NIFTY tends to move 0.5-1.2% on a typical expiry day with no special news.
SENSEX — weekly, Thursday (BSE). The other surviving weekly, on the BSE. Similar mechanics to NIFTY; volumes grew after the 2024-2025 reforms concentrated weekly activity into the two remaining contracts.
BANK NIFTY — monthly only, last Tuesday. Its weekly was discontinued in Nov 2024. Highest IV of the index group; strongest max-pain gravity — it very often settles within 100-200 points of max pain into its monthly expiry. Higher absolute move than NIFTY, often 1.0-2.0%.
FIN NIFTY & MIDCAP NIFTY — monthly only, last Tuesday. Both lost their weekly contracts in Nov 2024. FIN NIFTY's max-pain gravity is weaker than BANK NIFTY's (more diversified basket); MIDCAP NIFTY is the highest-beta and lowest-liquidity, so its moves can be sharper in percentage terms.
Rollover data — what it means
Rollover is the process of closing out the expiring monthly contract and opening a new position in the next month's contract. The rollover percentage is the share of total OI being carried forward to the next month, computed daily in the run-up to monthly expiry.
High rollover (>75%) means traders are confident in their current positioning and willing to hold it into the next month. Usually a sign of strong directional conviction.
Low rollover (<60%) means positions are being closed without being reopened — capitulation or profit-taking, depending on direction of price.
Rollover cost matters too: if the next month's contract trades at a steep premium to the expiring one, it costs traders to roll. High rollover with high cost is a particularly strong conviction signal.
Strota tracks rollover for NIFTY, BANK NIFTY, and each individual F&O stock daily during the last week of each monthly expiry cycle.
What to trade on expiry day
Option selling. The classical expiry-day strategy. Sell the strikes immediately above and below spot (ATM straddles, or short strangles a bit wider) in the morning, collect Theta decay through the day, close before settlement. Works best on low-news days; high risk on event days. Strota's option chain shows the strikes with highest IV crush potential.
Pin trades. Bet that the index will close near the highest-OI strike (the 'pin'). Buy the at-the-money straddle if you think the index will not pin (volatility play); sell the OTM strikes around the pin if you think it will.
Avoid: momentum-chasing the first hour. Expiry day morning often sees position-unwind volatility that reverses sharply by midday. The strongest setups emerge after 11 AM.
Strota's expiry-day page surfaces today's max pain, today's highest-OI strikes, the recent move's volatility profile, and the OI-flow signals from the option chain.
Historical expiry-day moves
Strota's historical lookback shows the close-to-close move on each prior expiry day for the past 50 sessions. Median absolute move on a NIFTY weekly (Tuesday) runs around 0.6%; on a BANK NIFTY monthly expiry around 1.0%. Tail risk is higher than these medians suggest — about 1-in-15 expiry days sees a >2% move, almost always driven by overnight global news or a policy event.
Pattern to watch: monthly expiry weeks see higher absolute moves than weekly-only expiry weeks because monthly OI is much larger. The Monday of monthly expiry week often sets the tone.
Key takeaways
- NIFTY weekly expires Tuesday (NSE); SENSEX weekly expires Thursday (BSE) — one weekly per exchange since Nov 2024.
- BANK NIFTY, FIN NIFTY, MIDCAP NIFTY and single-stock F&O are all monthly-only, expiring the last Tuesday.
- Max pain gravity is strongest in BANK NIFTY, weakest in MIDCAP NIFTY.
- Rollover percentage above 75% signals high conviction; below 60% signals capitulation.
- Option selling and pin trades are the highest-edge expiry-day setups when news flow is quiet.
- Median expiry-day move: 0.6% for NIFTY, 1.0% for BANK NIFTY. Tails are fatter than the median suggests.
Frequently asked questions
What time does NSE F&O settlement happen?
Settlement is based on the closing price (the volume-weighted average price of the last 30 minutes of trading: 3:00-3:30 PM IST). All in-the-money option positions auto-exercise at this settlement price.
Is option selling on expiry day risky?
It's the most popular expiry-day strategy because Theta decay accelerates as time runs out. But Gamma also peaks on expiry day, meaning a sudden move against your position causes losses to compound faster than on any other day. Naked option selling without stops on expiry day has wiped out many retail accounts. Always use spreads, stop losses, or both.
What is rollover percentage and when does it matter?
Rollover percentage is the share of expiring monthly OI being rolled into the next month's contract. It's relevant in the last 5-7 trading days of each monthly cycle. Above 75% signals high directional conviction; below 60% signals position closure / capitulation. NSE publishes daily rollover data.
Does expiry day always pin to max pain?
Often, but not always. BANK NIFTY pins to within 100-200 points of max pain on a majority of its monthly (last-Tuesday) expiries. NIFTY pins within 30-60 points on roughly half of its Tuesday weekly expiries. Big news days (RBI policy, US Fed announcement, election results, major earnings) override the pin gravity entirely.
Which index expires on which day now?
On the NSE, NIFTY has the only weekly index option and it expires Tuesday; BANK NIFTY, FIN NIFTY, MIDCAP NIFTY and single stocks are monthly-only, all settling the last Tuesday. On the BSE, SENSEX has a weekly expiry on Thursday. The old setup of a different index expiring every weekday ended with SEBI's November 2024 one-weekly-per-exchange rule.
Why is BANK NIFTY's expiry-day move usually bigger than NIFTY's?
Two reasons: BANK NIFTY's underlying is more concentrated (12 banking stocks vs 50 broader stocks) so it has higher realised volatility, and BANK NIFTY options carry heavy institutional hedging in the banking sector. Note its expiry is now monthly (last Tuesday) since the weekly was discontinued in Nov 2024.