Scrip of the Tata Group company plunged 14.40 per cent to settle at Rs 1,872.65 on the BSE. In intra-day session, it tumbled 16.25 per cent to Rs 1,832.05.
At the NSE, it slipped 14.49 per cent to end at Rs 1,862.
Massive sell-off in the stock pulled down the company's market value by Rs 953.87 crore to Rs 5,674.13 crore.
On the volume front, 1.18 lakh shares of the company changed hands at the BSE, while over 5 lakh shares were traded at the NSE during the day.
The BSE IT index was down 4 per cent and ended at 10,130.95.
The Board of Directors of CMC and TCS have approved the amalgamation of CMC with TCS pursuant to and subject to the provisions of Sections 391 to 394 of the Companies Act, 1956," CMC had said in a filing to the BSE yesterday.
CMC shareholders will get 79 equity shares of Re 1 each of TCS for every 100 equity shares of Rs 10 each of CMC, it had said.
Tata Group company CMC also posted a 13 per cent increase in its September quarter net profit at Rs 76 crore.
CMC announced a consolidated operating revenue of Rs 617 crore, up 10 per cent over the same period last year, and posted an operating profit of Rs 104 crore, which is 18 per cent higher than last year.
The company's operating margin widened by 1.49 per cent, the release said without divulging the absolute number it has climbed up to.
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