India, Oct. 14 -- The Tata Motors demerger takes effect today to list the trucks and car units separately on India's stock exchanges.

After the demerger, the company will be renamed as Tata Motors Passenger Vehicles Ltd. and house all the car-making businesses including electric cars and JLR. The newly carved out entity - India's biggest maker of trucks and buses - will then be called Tata Motors Ltd.

The new Tata Motors share price will become active after a one-hour pre-market trading session from 9:00 am in Mumbai. The price discovered during this window will help determine the valuation of Tata Motors CV, based on the difference from Monday's closing price.

Indian exchanges introduced these so-called special trading sessions in 202...