Noida-based company IKIO Lighting's Rs 607 crore initial public offering (IPO) will open for subscription on 1 June and close on 8 June. The company's stock is commanding a premium of Rs 92-94 in the unlisted market, indicating the demand for the shares, according to market sources. Grey market premiums are subject to change. The IPO consists of a fresh equity issue of up to Rs 350 crore and an offer for sale of up to 90 lakh shares. The net proceeds will go towards general corporate purposes, investment in subsidiary IKIO Solutions, repaying borrowings, and setting up a new facility in Noida.