Shares of Ambuja Cements may remain in action, as it has secured a limestone block at Nandgaon Ekodi in Maharashtra. The company has secured limestone resource of 42 million tonnes at a final bid price of 125.02 per cent of the value of mineral. The company expects a formal communication vesting the block in its favour, an Ambuja Cements statement said. Investors and analysts will closely monitor the development.