Shares of the company opened weak at Rs 107.80, then cracked 8.75 per cent to a 52-week low of Rs 102.10 on the BSE.
Similar movement was seen on the NSE too, where the stock opened at Rs 106.80, then fell to its 52-week low of Rs 102, down 8.92 per cent over its previous close.
Amid the multi-agency probe into the PNB scam, the state-run bank yesterday said the amount of fraudulent transactions could be Rs 1,300 crore more than the current estimate of about Rs 11,400 crore.
"...We have to inform that quantum of reported unauthorised transactions can increase by USD 204.25 million (approximately)," the filing said.
At the current exchange rate, the amount comes to around Rs 1,323 crore.