Mistry, who was ousted as Chairman of Tata Sons in a sudden surprise move last month, suffered another setback when a non-executive director of Tata Chemicals Ltd, Bhaskar Bhat, resigned disagreeing with the proceedings and demanded his resignation.
Even after being removed as Chairman of Tata Sons, Mistry continues to head the group's several listed firms, including Tata Motors, Tata Power, Tata Steel and Tata Chemicals.
Wadia is reported to have rallied independent directors of Tata Chemicals to back Mistry as Chairman of the company.
The latest moves is seen as attempts by Ratan Tata, who was brought in as interim head after sudden removal of Mistry, to seize back control of India's largest conglomerate.
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Tata Sons is seeking to remove Mistry from other group units to help the promoters tighten grip over the USD 103 billion business empire.
Bhat is also managing director of Titan Co, a jewellery manufacturer backed by Tata Group.
Intensifying its efforts to remove Mistry from group
"The company has received a requisition and a special notice dated November 10, 2016...From Tata Sons Ltd..For convening an extraordinary general meeting of the company for considering and passing resolutions for removal of Cyrus P Mistry and Nusli N Wadia, Directors of the Company under Section 169 of the said Act," Tata Motors said in a BSE filing.
Similarly, Tata Steel also said it received a notice by Tats Sons to convene an extraordinary general meeting (EGM) to remove the steel major's Chairman Cyrus P Mistry and independent director Nusli N Wadia.
Likewise, another group firm Tata Chemicals said it has received a notice to convene a meeting of shareholders to remove Mistry and independent director Wadia from the company's board.