The stock tumbled 6.05 per cent to settle at Rs 35.70 on the BSE. In intra-day, it dipped 7.63 per cent to Rs 35.10 -- its 52-week low.
On the NSE, shares of the company fell by 6.43 per cent to end at Rs 35.65.
The company's market valuation went down by Rs 283.81 crore to Rs 4,410.19 crore.
Indian Overseas Bank (IOB) on Saturday reported 94.56 per cent decline in net profit at Rs 14.76 crore for the quarter ended June 30, 2015, compared to the same period last year, on sharp increase in provisioning for bad loans.
IOB's total income grew to Rs 6,672.11 crore in the quarter under review, up 6.16 per cent from Rs 6,284.69 crore during the same period of 2014-15 fiscal.
Gross NPA of the bank as on June 30, 2015 stood at 9.40 per cent, as against 5.84 per cent during the same period last fiscal.
Net NPA stood at 6.31 per cent in the reported quarter as against 3.85 per cent registered during the same period of the previous fiscal.
