A technology glitch at Religare Capital Markets caused "unintended transactions", the brokerage said on Saturday, a day after deeply discounted sale of large blocks of shares in Tata Motors and UltraTech Cement hit the markets.
National Stock Exchange Ltd said on Friday it was investigating the block sales in two stocks, the latest in a series of unusual price movements to rattle the market.
"Religare Capital Markets Limited uses third party software for execution of orders on stock exchanges. Due to some technical issue in the software, unintended transactions got executed," the brokerage said in a statement.
"There was no broker error and no loss to any clients," it said, adding the matter was being looked into by the software provider. It said there was no impact on client business and the brokerage would operate normally on Monday.
A total of 2.07 million shares in Tata Motors were sold in six blocks at an average price of Rs 274.92 in the afternoon on Friday, well below the roughly Rs 292 level at which the shares were trading at the time.
Tata shares fell as low as Rs 268.25 before ending the session down 5.49% at Rs 281.64.
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Shares in UltraTech, a cement maker, ended down 3.4% after an earlier block sale of 41,863 shares took place at an average Rs 1,853.80, also well below where shares were trading at the time.
Both trades took place around the same time.