The board of Tata Sons, the promoter of major operating firms of the Tata group, had earlier this month asked firms of the conglomerate to terminate all business relationship with the Shapoorji Pallonji (SP) Group, according to Tata group insiders.
The SP group has, however, said that during Mistry's tenure as Tata Sons chairman, engineering and construction contracts from all Tata companies had fallen to zero and if there were any residual orders pending, it would be "extremely insignificant in value".
Queries sent to Tata Sons remained unanswered.
The SP Group is the single largest shareholder in Tata Sons with 18.4 per cent stake.
In a statement, SP Group said when Mistry was chairman of Tata Sons, he had issued a directive in November 2013 to all Tata group companies to ensure that no new engineering and construction contracts were awarded to the SP group, during his tenure.
Orders from the Tata Group fell from Rs 1,125 crore in 2012-13 to zero in 2015-16, when Mistry was the chairman of Tata Sons, it added.
The Tata group and Mistry are currently fighting it out in the court after last year's bitter board room battle in which the latter was removed from the top post of the over USD 100-billion salt-to-software conglomerate.
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