Listed Tata group companies have seen a sharp decline in combined market value amid continuing uncertainty over Tata Sons’ leadership, governance and potential stock-market listing.

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According to market data cited in the latest report, 26 listed Tata companies collectively lost ₹2,65,748 crore in market capitalisation between August 12 and September 30, taking their combined value down from ₹27,02,915 crore to ₹24,37,166 crore. That represents a decline of nearly 10%.

The selling pressure has been broad-based, with 23 of the 26 stocks recording negative returns during the period. A dozen companies reportedly posted double-digit declines. Tata Elxsi and Tata Motors Passenger Vehicles were among the sharper fallers, while Voltas and Tata Technologies also recorded significant declines.

The market reaction has coincided with an increasingly public dispute surrounding Tata Sons. Tata Trusts, which owns 66% of Tata Sons, has opposed a proposed listing and has backed a restructuring plan involving the merger of Tata Electronics Systems Solutions and Tata Consulting Engineers with Tata Sons. The proposal is intended to change Tata Sons’ regulatory classification and potentially allow it to remain unlisted.

At the same time, the Tata Sons board has backed N. Chandrasekaran for another five-year term, despite opposition from Tata Trusts leadership. The disagreement has added uncertainty around the group’s governance and future structure.

The decline in listed Tata stocks reflects the market’s response to this uncertainty, although individual companies continue to have their own operating and financial factors influencing their share prices.