Expiry week is different. Options that were routine can suddenly turn against you. Physical delivery on stock options can force unwanted trades. Managing expiry-week positions is a distinct skill.
1. Pin risk — when underlying closes very close to a strike price at expiry. Small moves have outsized impact on your P&L.
2. Assignment risk — being forced to fulfill your short option’s obligation (deliver stock or buy at the strike).
Both are amplified on the last day of expiry.
An option “pins” a strike when the underlying closes right at (or extremely close to) that strike at expiry. For index options this just means uncertain settlement. For stock options with physical delivery, it means uncertain assignment.
Example: You sold a Reliance 3,000 call. Reliance closes at exactly ₹3,000.05 at expiry. The call is technically ITM by ₹0.05 — you’ll be assigned. But it’s essentially a coin flip whether you’re forced to deliver 250 shares (worth ₹7,50,000) at 3,000.
This is pin risk.
Large institutional positions concentrate at “round number” strikes. Their hedging activity (buying/selling underlying to adjust delta) tends to push prices back toward strikes as expiry approaches. This is why stocks sometimes seem to “magnetically” close near heavily-traded strikes.
Option 1: Close before the final hours
Simplest rule — don’t hold any short options into the last 2 hours of expiry day if the underlying is near your strike. Close and take the outcome.
Option 2: Buy the option back if it’s at-the-money late
If your short call is trading at ₹2 and underlying is at your strike, buy it back for ₹2. Small cost to avoid unpredictable assignment.
Option 3: Roll to next expiry
If you still want the position, roll it out (see Chapter 23). Extends time and moves you away from immediate pin risk.
Indian stock options are physically settled. If your short option is ITM at expiry, you’ll be assigned actual shares.
Short call assigned: you must deliver the shares.
Short put assigned: you must buy the shares.
For monthly stock option expiries, brokers typically restrict positions from the Monday of expiry week. Requirements:
Best practice: close all stock options by end of Monday (day before expiry) if:
Deliberate acceptance strategies:
1. Covered call assigned as designed
2. Cash-secured put assigned as designed
3. Rolling to avoid delivery
Nifty, BankNifty, Finnifty options are cash-settled:
Because of cash settlement, index options are the safe choice for holding into expiry.
Nifty index settlement uses the average of last 30 minutes of index price. This creates a specific type of manipulation risk:
If Nifty closes right at your short strike (either side of an iron condor):
If you know Nifty is heading toward your short strike as expiry approaches, close the entire condor rather than gambling on precise settlement.
Note: All Indian stock and index options are European style — can only be exercised AT expiry, not before. This eliminates early-assignment risk (which is a major issue for American-style options in the US).
Benefits:
Downside: you can’t exercise early to capture a dividend (a US-market technique). Not usually a factor in India due to structure.
For every short-option position:
For every long-option position:
Max pain = the strike price at which option BUYERS collectively lose the most money at expiry. Equivalent: the strike where option SELLERS collectively make the most.
Theory: since market makers are on the short side (writing options), price tends to gravitate toward max pain as expiry approaches.
For each candidate strike K:
Pain(K) = Σ (Call OI × max(0, K − Kᵢ)) + Σ (Put OI × max(0, Kᵢ − K)) (over all strikes Kᵢ)
Max pain = strike where Pain(K) is MINIMIZED (i.e., total value paid by shorts is smallest).
| Strike | Call OI | Put OI |
|---|---|---|
| 24,800 | 50k | 120k |
| 24,900 | 80k | 150k |
| 25,000 | 200k | 200k |
| 25,100 | 140k | 80k |
| 25,200 | 90k | 50k |
Pain(25,000):
At K = 25,000:
Repeat for each K. The minimum is max pain.
Practical: brokers/tools like Sensibull, Opstra compute this in real-time.
Statistical reality:
Max pain as one input, not the answer:
Do NOT blindly sell strangles centered at max pain. It fails 40-50% of the time.
Each curve is the same option at a different time-to-expiry. As DTE shrinks, the peak (at the strike) gets sharper and taller. The last few hours of expiry day compress this to a near-singularity for ATM options — which is why short-strangle P&L swings so violently near expiry.
Gamma = rate of change of delta. For ATM options:
Γ ≈ 1 / (S × σ × √T)
As T → 0 (expiry approaches), gamma → infinity for ATM strikes.
Nifty at 25,000, weekly expiry with 4 hours left:
Compare to same call 2 days out:
Same underlying move, twice the option price change on expiry day.
Short strangle P&L on expiry day:
This is the gamma nightmare. Small moves = big P&L swings near ATM.
Weekly Nifty options on Tuesday (expiry day):
Traders who hold to 3pm are gambling, not trading.
Instead of usual 2% OTM strangle, go 3-4% for the last weekly:
Take a short strangle, add long wings to convert to iron condor:
Worth doing every expiry week — insurance against gap moves.
Instead of collecting premium via short strangle, use a broken-wing butterfly:
If Sensex weekly has 3 days left and Nifty weekly has 1 day left, trade Sensex — you avoid the immediate gamma explosion.
Even if all strategies work — cut your normal position size in half during expiry week. Fewer contracts, less pin risk exposure.
Close all positions by 2 PM on expiry day. You lose the last hour of theta, but avoid all pin/assignment/settlement chaos. For most retail traders, this is the right call.
Only hold into settlement if:
Read your broker’s expiry-week policies at least once. They vary in details and can affect you.