"Cyrus P Mistry, Deputy Chairman of Tata Sons, has been appointed Deputy Chairman of Tata Steel with immediate effect," the company said in a filing to the BSE today.
In a similar communique, Tata Chemicals also said the appointment as Deputy Chairman has been effected with immediate effect.
Mistry would be succeeding as the chairman of Tata Group.
Tata Motors and Tata Consultancy Services have also inducted Mistry as Deputy Chairman.
Tata Power yestreday said Mistry has been elevated as its chairman.
Mistry has been a Director of Tata Sons since 2006. He was appointed Deputy Chairman of Tata Sons in November 2011.