Trading on National Stock Exchange (NSE) was halted for around 15 minutes on Friday morning as freak trades triggered a 15 percent drop in the index.
NSE said domestic financial firm Emkay Global Financial Services was responsible for the erroneous trades of over 6.5 billion rupees ($125.3 million) that caused a halt in the bourse's trading systems.
The bourse said Emkay had placed 59 erroneous orders that resulted in multiple trades with an aggregate value of over 6.5 billion rupees on behalf of an institutional client.
The non-algorithmic trades were identified to a specific dealer terminal, the NSE said in a statement.
The exchange said it was investigating what it called abnormal orders resulting in multiple trades at low prices.
The NSE index, widely known as the Nifty, suddenly dropped by around 920 points to a session low of 4,888.20 points - 15.5 percent below its closing level on Thursday.
There was a freak trade in the cash segment which hit the circuit filter. However, the futures and options segment has not been affected, a source at the exchange told Reuters. As a result, markets stopped but trading was resumed soon after.
NSE futures and options markets traded as normal throughout, while trading on India's BSE index was also uninterrupted.
Some financial and blue-chip stocks, including State Bank of India, mortgage lender HDFC and cigarette maker ITC fell sharply before trading was halted.
In April, a sudden drop in Nifty futures sparked speculation of an erroneous trade, but the exchange said no errors had been spotted on its trading systems.
Nifty crashes 800 pts; NSE blames broker for bad orders
New Delhi: The National Stock Exchange index Nifty crashed 800 points this morning, halting the trade, which the bourse blamed on erroneous orders worth Rs 650 crore by a broker Emkay Global for one of its clients.
The NSE said it is investigating the matter and the abnormal orders that resulted in multiple trades at low prices.
In a statement after the incident, which halted the trade in cash markets for about 15 minutes, NSE said, "The market circuit filter got triggered due to entry of 59 erroneous orders which resulted in multiple trades for an aggregate value of over Rs 650 crore.
"These orders have been entered by a trading member Emkay Global Financial Services on behalf of an institutional client.
"These non-algo market orders have been entered for an erroneous quantity which resulted in executing trades