The Shapoorji Pallonji Group on Thursday sought a formal separation from Tata Group in the Supreme Court, proposing that its stake in Tata Sons be swapped for a pro-rata stake in the Tatas' listed companies. The two conglomerates have been embroiled in a legal battle since 2016 when Cyrus Mistry, scion of the family that controls the SP Group, was sacked as chairman of Tata Sons. The Shapoorji Pallonji or SP Group, which is the largest minority shareholder in Tata Group, believes it is necessary to separate interests from the auto-to-steel conglomerate.