Why Is Aluminum Corporation of China ($ACH) Stock Down 30.22% Today? ACH shares fell roughly 30.22% intraday, sliding to about $0.208 from a prior close of $0.

Why Is Aluminum Corporation of China ($ACH) Stock Down 30.22% Today? ACH shares fell roughly 30.22% intraday, sliding to about $0.208 from a prior close of $0.2981. The primary catalyst is weakness in aluminum pricing and a pullback in global commodity sentiment.