Did HEG shares really crash 64% in one day? Here’s how the demerger math works

HEG shares opened nearly 64% lower on Monday as the stock adjusted for the company’s demerger, which split its businesses into two separately listed entities. The graphite electrodes business will move to HEG Graphite, while the existing listed company will retain advanced materials, battery energy solutions and green power businesses and be renamed HEG Advanced Materials.