Lucky Cement Ltd has completed a second share buyback exercise representing 6.5 per cent of its paid-up capital at spot prices, the company said on Tuesday. According to data compiled by Arif Habib Ltd, the cement maker’s average purchase price was Rs632.60 per share for 20.375 million shares that it bought between June 2 and Nov 20. As a result, the share buyback cost the company a total of