Shares of BHEL hit over four-month low as March-quarter profit plummeted 57 per cent.
State-run power plant equipment maker Bharat Heavy Electricals Ltd dived as much as 12.9 per cent to Rs 133.60, its lowest since January 27.
The stock posted biggest intraday percentage loss since February 12, 2016.
The company reported a bigger-than-expected 57 per cent plunge in Q4 net profit, missing analysts' estimates.
BHEL's domestic orders continued to be weak for the fourth straight quarter, and revenue visibility remains weak, Investec analysts said in a note.
More than 15.8 million shares traded, 3.2 times their 30-day moving average.
Up to Monday's close, the stock up 26.5 per cent this year.