The stock zoomed 9.76% to settle at Rs 431.65 on BSE. Intra-day, it surged 10.95% to Rs 436.35 -- its 52-week high.
On NSE, shares of the company gained 9.88% to Rs 433 at close.
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The company added Rs 1,513.66 crore to its market valuation to reach Rs 17,010.66 crore.
In terms of volume, 6.99 lakh shares of the company were traded at BSE and over 70 lakh shares changed hands at NSE during the day.
Projecting a defeat of Jayalalithaa-led AIADMK in Tamil Nadu, various exit polls have given DMK-Congress alliance a comfortable majority in the state.
Counting of votes will take place on May 19.