Mamata Machinery Ltd.'s IPO has been subscribed 47.65 times so far.The grey market premium of Mamata Machinery IPO is Rs 260, indicating a potential listing at Rs 503 apiece.The price band for the IPO is set at Rs 230 to Rs 243 per share.Promoters and selling shareholders will offer a total of 73.8 lakh shares through the offer for sale.