On June 18, China National Building Material (03323.HK) declined 6.51% in regular trading, trading at HK$6.15/share, with turnover of HK$318 million. The stock gave back a significant portion of its prior-session gains.

On the news front, a large block sale of 2.9 million shares appeared during early trading at HK$6.5 per share, totaling approximately HK$18.85 million. This sizable sell order reportedly triggered broader market concerns over capital outflows, intensifying downward pressure on the stock.

The selloff comes just one day after the stock surged over 16%, driven by a policy catalyst in which five government departments jointly issued a notice targeting energy-saving and carbon-reduction upgrades across nine industries including cement. That rally was further supported by optimism around the companys new materials segment benefiting from AI-related demand, particularly through subsidiaries China Jushi and China National Materials Technology in the electronic-grade fiberglass supply chain.

Within the Construction Materials sector, the overall tone was weak. Among peers, Conch Cement rose 0.39%, while CR Building Material Technology fell 3.45%, West China Cement fell 2.42%, Huaxin Building Material fell 1.93%, and BBMG fell 1.56%.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)