The Nifty futures open interest decreased by 28.45% while the Minifity futures open interest decreased by 13.34% as the market closed at 6143.40. The Nifty October future closed at a premium of 32.90 points against a premium of 10.85 points in the previous session, while the November future closed at a premium of 44.20 points. The PCR-OI decreased from 2.00 to 1.36. FIIs were net buyers of Rs. 1,825 crores in the cash market segment and significant build up was seen in the 6200 and 6300 call option series.