Unusual trading in ACC on NSE

ACC rose as much as 19.2 % to Rs 890, in intra-day trading on NSE, in what seems to be a punching error.At 11:45 IST, when trading on the bourses was halted for 45 minutes for sun outage, the stock was up 2.1% to Rs 763. The stock’s average price by that time was Rs 776.23 on NSE.And now again the stock is trading at Rs 742 which is lower than previous days closing at Rs 746.70.

Today Acc has shown such erratic behaviour and also Mindtree which is still trading around Rs 897-900 levels.Analysts are trying to gauge the reasons behind this behaviour,but caution is advised.