PANews, July 10 - The Hong Kong-listed company Puxing Energy (00090) saw its stock price rise nearly 280% in early trading, closing up 141.38% at HKD 1.40, with a peak rise to HKD 2.24. Previously, the company announced that it had subscribed to Series A preferred shares issued by HashKey Holdings Limited, holding no more than 5%, thus becoming a shareholder.