India, Oct. 14 -- Tata Motors shares slumped nearly 40 per cent on Tuesday as the stock began trading without the value of its commercial vehicles business, marking the final leg of the automaker's much-anticipated split into two listed entities.

In a special one-hour pre-open session held between 9 aam and 10 am on the BSE and NSE, Tata Motors' shares were discovered at Rs.400 apiece, down 39.5% ( Rs.260.75) from Monday's closing price of Rs.660.75. The sharp fall reflects the price adjustment post the demerger of the company's trucks and buses business into a new entity.

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This special trading session, introduced by Indian exchanges in 2023 for companies undergoing demergers, was aim...