Chinese companies in Hong Kong are abandoning a long-held practice of reporting earnings in dollars in favor of the yuan.

Want Want China Holdings Ltd. made the switch for the first time since its 2008 listing when reporting first-half earnings last month, while Hengan International Group Co. dropped the Hong Kong dollar figures it has used since at least 2001. China Resources Beer (Holdings) Co. said it moved to yuan-denominated reports to reduce the impact of currency moves.

While Capital Link International Holdings Ltd. says the growing international importance of the yuan means it no longer makes sense for the nation's companies to report in a foreign currency, JPMorgan Chase & Co. says the weaker Chinese currency is triggering the move. The yuan will decline a further 1.3% to a six-year low by the end of the December, according to analysts' median forecast in a Bloomberg survey.