The company had posted a net loss at Rs 83.88 lakh in the corresponding period of the previous year, Dunlop India said in a regulatory filing.
For the six-month period ending September 30, net loss widened to Rs 20.46 crore compared with a loss of Rs 1.66 crore a year ago.
The company said both its plants at Ambattur in Chennai and Sahaganj in West Bengal were non functional due to "suspension of operation".