SEOUL, Aug 4 (Reuters) - SK Hynix and representatives of one of its South Korean unions are holding ‌a fifth round of talks on bonuses at ‌the chipmaker's factory complex in Cheongju city on Tuesday. Last year, SK Hynix agreed to share 10% of its annual operating profit with workers. • The union said it "would absolutely not accept any arrangement in which union members bear the risk of stock-price fluctuations." • An SK ​Hynix spokesperson declined ​to comment. • SK Hynix shares have jumped more than ​130% this ‌year, but have lost nearly half their value since ​hitting record highs in June.