Separately, in a March 31 statement to the BSE Stock Exchange, Apollo said it was "fully cooperating" with the anti-trust regulator's investigation and had provided all the details required.
"We are of the firm view that we have acted and will continue to act in compliance with the competition laws," said the filing.
Also confirming the investigation, Ceat said it was "fully cooperating" and stressed that it had never "indulged in nor was part of any cartel, nor undertook any anti-competitive practices."
In a notice filed with BSE on April 1, MRF also said that competition authorities visited its premises on March 30 and that the tire maker was "fully cooperating."
The statements by the tire makers came a day after a news report by Reuters which claimed that the anti-trust authority had raided the offices of the companies in multiple Indian cities.
Citing informed sources, the Reuters report said the case was related to an investigation into "the use of unfair practices and rigging of bids while supplying tires for public transport vehicles in the northern state of Haryana."
According to German news agency DPA, the premises of Continental in Farbidabad, Apollo Tyres in Gurgaon, Ceat in Mumbai and MRF in Chennai were searched.
In the 2021 Global Tire Company Rankings, Continental is ranked No. 4, Apollo is ranked No. 15, MRF is ranked No. 16 and Ceat is ranked No. 26, according to Rubber News data.
