Stating that it has taken note of the public announcement of Mistry's resignation, Tata Sons said it would respond adequately to "baseless, unsubstantiated and malicious" allegations made by him.
"Mr. Mistry's resignation is a deliberate strategy on his part, knowing fully well that the overwhelming majority of the shareholders were not in support of his actions," Tata Sons said in a statement.
Responding to the warning by Mistry that he would move to "a larger platform" where "rule of law of and equity is upheld", Tata Sons said it has responded to his charges on multiple occasions and "will respond adequately to any allegations made by Mr. Mistry".
The company also "strongly" resented claims by Mistry "to align with the values and ethics of Jamsetji Tata and the Tata Group".
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"On the contrary, Mr. Mistry and his family companies have not upheld the high standards and values set by Jamsetji Tata and his successors. Mr. Mistry has done precious little to build the goodwill of the Tata Group, built through the hard work and dedication of its employees," the statement said.
In a dramatic turn to India's biggest boardroom spat, Mistry today quit from boards of the six key operating Tata companies but not before launching a scathing broadside against Ratan Tata and vowing to shift his fight to a "larger platform".