At the National Commodity and Derivatives Exchange, refined soya oil for delivery in January edged up by Rs 1.35, or 0.18 per cent, to Rs 736.50 per 10 kg with an open interest of 25,670 lots.
Similarly, the oil for delivery in February contracts traded higher by a similar margin to Rs 744 per 10 kg in 32,400 lots.
Analysts said expansion in positions by traders owing to upsurge in demand in the physical market against tight stocks on restricted supplies from producing belts kept refined prices higher in futures trade.