The financial controller and executive director of troubled solar-power equipment maker Hanergy Thin Film Power Group, Li Guangmin, has resigned from those positions, The Wall Street Journal reported, citing a statement to the Hong Kong Stock Exchange. Hanergy Thin Film suspended trading of its shares in May after its stock price fell 47% in just minutes, and the firm’s company secretary resigned in June. The move by Li, who was said to have left the positions due to “personal career development,” comes as the firm’s finances and relationship with its parent company remain under investigation by the Hong Kong Securities and Futures Commission.