The stock dived 11.56 per cent to end at Rs 502.85 on BSE. During the day, it had plunged 13.28 per cent to Rs 493 -- its 52-week low.
On NSE, it tumbled 11.45 per cent to close at Rs 502.60.
The stock was the worst performer among the Sensex and Nifty components.
Led by the sharp sell-off in the stock, the company's market valuation fell sharply by Rs 15,765.65 crore to Rs 1,20,645.35 crore.
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Sun Pharma on Friday reported 14 per cent decline in consolidated net profit to Rs 1,223 crore for the fourth quarter to March 31, 2016-17, on account of pricing pressure in the US market.
Its net profit was Rs 1,416 crore for the same period of the previous fiscal.
Income from operations during the period also declined to Rs 6,825 crore, as against Rs 7,415 crore a year ago, Sun Pharmaceutical Industries said in a statement.