The stock slumped 9.88 per cent to end at Rs 457.25 on BSE. During the day, it tanked 10.99 per cent to Rs 451.60.
At NSE, shares of the company plunged 9.83 per cent to settle at Rs 457.40.
Following the sharp decline in the stock, the company's market valuation fell by Rs 15,057.51 crore to Rs 1,31,438.49 crore.
The stock was the worst performer among the Sensex and Nifty components.
"Standalone business performed weakly in Q2," Prabhudas Lilladher said in a report.
On standalone basis, Tata Motors' net loss widened to Rs 631 crore for the quarter under review compared to Rs 289 crore in the year-ago period.
The company's standalone net sales were at Rs 11,406 crore as against Rs 11,794 crore in the year-ago period, down 3.28 per cent.
Meanwhile, Tata Motors reported consolidate profit after tax of Rs 848 crore for the September quarter, mainly on the back of good show by JLR.
Its consolidated net revenue in the second quarter of 2016-17 was up 6.94 per cent at Rs 67,000 crore as against Rs 62,647 crore in the year-ago period.
JLR posted strong sales in all the regions -- UK, Europe, North America, China and other overseas markets, the company said.
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