If price of future and cash market become same on expiry day why are the closing prices of future and cash market on expiry day different on charts. For e.g: SBIN Future price closing on 29th june 2017 is 274.4 and cash market closing on same day is 272.45.
All futures contracts on expiry day after market close is settled to the adjusted closing price of the underlying stock. So the last traded price for futures can be different to what is the actual settled price (settlement price is calculated after market close).
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