Micromax Informatics’ valuation has crashed about 93% in roughly four years from a peak of Rs 21,000 crore in 2015 to less than Rs 1,500 crore now, with major private equity investors including TA Associates and Sandstone Investment exiting the Indian handset maker. PE players are selling 6.9% in the company for Rs 93.65 crore to the promoters, whose holding will increase to more than 85.