At a rollover of 83.5%, which was the highest in the last five months, we did enter the new series with a large section of traders persisting with their existing views. A day after February expiry, the total Nifty OI was seen about 25% higher than a day after January expiry, pointing to the large open positions that may have also led to the magnitude of the fall on Friday. At a rollover of 83.5%, which was the highest in the last five months, we did enter the new series with a large section of traders persisting with their existing views. A day after February expiry, the total Nifty OI was seen about 25% higher than a day after January expiry, pointing to the large open positions that may have also led to the magnitude of the fall on Friday. Economic Times