Comment on STT Trap - Options Expiry - NSE BSE MCX-SX
Shrikant,
If you are a person who has shorted and letting the options expire worthless, nothing extra you have to pay. It is settled on T+1 i.2 the next day you will have funds in your account.
The large amount of buy orders that you see are basically of people who are covering the options they have shorted. They would be covering their positions to free the margin blocked so that they can probably use that margin to rollover the position or use it for another trade.