Why Banknifty expiry is not updated on kite, it was going to be on Wednesday (weekly) but all September expires are on Thursday !!
Wednesday expiry come into effect from September 4. Explained here: Revision in expiry day of weekly Nifty Bank F&O contracts from Thursday to Wednesday
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It means they will be updated after September 1st !?
Yes, At the end of the day on September 1, 2023, the expiry date of all existing contracts will be revised to Wednesday as mentioned above.
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Trading symbol will also change?
What is wrong if weekly expiry is it’s on Thursday itself ? i don’t understand the logic behind it , whereas the monthly is kept on Thursday
monthly expiry should match with the stock’s expiry…
What are Banknifty-Nifty arbitrage trading strategies on monthly expiries !?
Can you please help me out about this !!
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Tough to explain, but let me try.
Banknifty has approx 40% weightage on Nifty. Keeping this ratio in mind and if we monitor the options flow, if a Nifty strike is underpriced and BN strike is overpriced.
We could end up buying nifty and selling BankNifty safely. Same also vice versa.
The position can be held as long as that pricing gets corrected or till 3.30 safely.
warning 
dont try it prima facie, it could get into complications.
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Now at least i have a brief idea about it, thanks mate 