Tata Sons' ousted chairman Cyrus Mistry ratcheted up his battle against the $100 billion software-to-salt conglomerate by launching legal proceedings on Tuesday, two sources familiar with the matter said.
Mistry made a surprise move on Monday to resign from the boards of all listed Tata companies.
He filed a petition under the Companies Act of 2013 at the National Companies Law Tribunal (NCLT), a quasi-judicial body that deals with corporate grievances in India, the sources said.
Mistry has cited the Act's sections 241 and 242, which deal with shareholder oppression and mismanagement, one of the sources said.
A late evening statement from Tata Sons said the holding company is consulting its lawyers and will contest the allegations.
After bowing out from the boards of listed Tata entities on Monday, Mistry said he would keep up a fight to improve governance norms in the nearly 150-year-old conglomerate.