Cement manufacturer Tasek Corp Bhd has sold 10. 01 million shares, or a 23.63 per cent stake, in Rock Chemical Industries Bhd at 2.00 rgt per share, a company statement said. As a result of the sale, which was undertaken via off market transactions, Tasek has ceased to be a substantial stakeholder in Rock Chemical. Rock Chemical manufactures cement, quicklime and concrete pavers.