HONG KONG, June 28 (Reuters) - Four more property developers listed in mainland China said they have received approval to refinance via share placements totalling 19.9 billion yuan ($2.8 billion), in a sign of the regulatory effort to improve liquidity in the embattled sector. Tuesday's announcements of fundraising approval came as investors expect Beijing to unveil more stimulus to revive the crisis-hit property market as part of its broader goal of shoring up the economy. State-owned China Merchants Shekou Industrial Zone (001979.SZ) was the first to receive such approval on June 16. According to state media, for developers traded on the Shanghai bourse alone, 12 companies have announced plans to seek approval for equity refinancing totalling 40 billion yuan. ($1 = 7.2277 Chinese yuan renminbi)Reporting by Clare Jim; Editing by Stephen CoatesOur Standards: The Thomson Reuters Trust Principles.

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Persons: Yan Yuejin, Clare Jim, Stephen Coates Organizations: China Merchants, Developments, Holdings, Greattown Holdings, Hubei Fuxing Science, Technology, D Institute, Shanghai bourse, Thomson Locations: HONG KONG, China, Beijing, State, Shanghai, Shenzhen, Hubei