The Indian conglomerate posted a 2.2 billion rupee ($23.2 million) loss for the quarter ended 31 March, versus a 38.5 billion rupee profit a year earlier.
Weakness in its coal trading unit outweighed stronger performance in the airport and data centre businesses, pushing the flagship company into the red.
The results were disclosed in a stock exchange filing on Thursday, and the company said there were not enough estimates to produce a reliable consensus.
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