CNBM (China National Building Material) saw its stock price plummet 5% during intraday trading on Thursday, reflecting significant selling pressure in the construction materials sector.

The decline was attributed to Hong Kong Exchange disclosure filings revealing that BlackRock, Inc. sold 330,000 shares of China National Building Material, reducing its stake to approximately 5.99% of total holdings. This institutional sell signal weighed heavily on market sentiment toward the stock.

Additionally, the broader construction materials sector faced broad-based pressure, with peer companies including Conch Cement, West China Cement, CR Building Material Technology, and Dongwu Cement all experiencing declines. Despite earlier market expectations of margin recovery driven by raw material price hikes and capacity removal policies, the sector remains under short-term adjustment pressure.