Mumbai, July 24 -- Three of Tata Group's new unlisted businesses-Air India, Tata Electronics Pvt. Ltd, and Tata Digital Pvt. Ltd-became among the conglomerate's highest revenue contributors in 2024-25. But that came at a cost.

The three companies contributed almost Rs.1.8 trillion to the group's Rs.15.3 trillion topline, but made a combined loss of Rs.15,500 crore, as per the latest annual report of group holding company Tata Sons.

In terms of revenue contribution, these companies were among the highest within the diversified group, only behind the big 3-Tata Motors Ltd, Tata Consultancy Services Ltd, and Tata Steel Ltd, each of which makes upwards of Rs.2 trillion in annual revenues.

Other big earners within the Tata Group are Tata Po...