The scrip tanked 6.46 per cent to Rs 41.25 on BSE.
At NSE, shares of the company dropped 6.46 per cent to Rs 41.20.
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Later, the stock made some recovery and was trading 1.81 per cent lower at Rs 43.30 on BSE.
The company had reported a net loss of Rs 157.6 crore during the same period of previous fiscal.
Net sales of the company also declined to Rs 539.83 crore for the June quarter as against Rs 854.22 crore in the same period of the previous fiscal, Amtek Auto said in a regulatory filing.
In the stock market, the Sensex was trading flat at 28,358.46, up 4.92 points at 1240 hrs.