Idea's stock plunged 9.55 per cent to end at Rs 97.60 on the BSE. During the day, it plummeted 14.73 per cent to Rs 92.
On the NSE, it dived 9.62 per cent to close at Rs 97.70.
Following the decline in the stock, the company's market valuation fell by Rs 3,691.87 crore to Rs 35,170.13 crore.
On the volume front, 271.90 lakh shares of the company were traded on the BSE and over 20 crore shares changed hands on the NSE during the day.
Vodafone India and Idea Cellular today announced the merger, creating the India's largest mobile operator by customer and revenue market share.
The merged entity, which will come into force over the next two years, will be headed by Kumar Mangalam Birla as Chairman.
Vodafone will own 45.1 per cent in the new company after transferring 4.9 per cent to the Aditya Birla group for Rs 3,874 crore in cash concurrent with completion of the merger.
Idea will hold 26 per cent of the combined entity while the rest will be owned by public shareholders.
Among other telecom players, shares of Bharti Airtel ended 0.76 per cent higher, while Reliance Communications slipped 0.26 per cent on BSE.
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