The scrip of the auto major fell 1.29 per cent to settle at Rs 325.35 on BSE. During the trade, the stock lost 2.45 per cent to Rs 321.50.
At NSE, shares of the company declined 1.65 per cent to Rs 324.45.
Tata Motors' sales growth remained flat at 40,680 units in August compared to 40,883 vehicles in the same month last year.
Domestic sales of Tata Motors' commercial and passenger vehicles declined 3 per cent at 35,478 units during the month as against 36,403 units sold in August, 2014.
Utility Vehicle sales declined 50 per cent during last month to 1,380 units, compared to the year-ago period.