Shares of defence PSU Cochin Shipyard fell around 5% to day's low at Rs 1,590 on BSE after a two-day offer for sale (OFS) where the government will sell up to 5% stake kicked off from Wednesday. The floor price for the OFS is set at Rs 1,540 per share, which is at a discount of 8% over Tuesday's closing price of Rs 1,673.