The stock tumbled 8.60 per cent to settle at Rs 380.90 on the BSE. During the day, it ran down 9.77 per cent to Rs 376 -- its 52-week low.
On the NSE, it slipped 8.61 per cent to end at Rs 380.20.
The company's market valuation declined by Rs 10,350.9 crore to Rs 1,09,979.10 crore.
The stock was the worst performer on both the key indices.
Home-grown auto major Tata Motors yesterday reported a 41.54 per cent jump in net profit at Rs 3,199.93 crore for the June quarter of the current fiscal, benefiting from one-time gain relating to changes made to JLR pension plans.
Income from operations during the period under review stood at Rs 59,818.22 crore as against Rs 66,165.89 crore in the year-ago period, down 9.59 per cent.
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