Shares of Cochin Shipyard (CSL) hit an all-time high of Rs 610.75 after it rallied 5 per cent on the BSE in Thursday’s intra-day trade in an otherwise subdued market on the back of heavy volume. In the past two trading sessions, the stock of the shipbuilding company has surged 12 per cent. In comparison, the S&P BSE Sensex was down 0.26 per cent at 60,745 at 12:27 PM.