Have a look at the revised lot Sizes which is to keep small traders away from the market. Weekly contracts in all indexes except Nifty and Sensex finished.
Presently bank nifty option is lot size 15 and it becomes 30 as per below date of execution
Lot size changes and relevant circulars issued by NSE
The existing weekly and monthly expiry contracts will continue with the existing lot size till its respective expiry date
In case of quarterly and half yearly existing expiry contracts, the same shall be transitioned to the new lot size on December 24, 2024, end of the day for BANKNIFTY and December 26, 2024, end of the day for NIFTY
First they changed expiry from weekly to monthly income Bank nifty and lot size doubled means that now a small trader will buy far out of money call to trade with a small capital and thus his chances of losing money further increases