SHANGHAI, Oct 30 (Reuters) - More than 30 Chinese listed companies unveiled share buyback and purchase plans over the weekend while major mutual fund house E Fund Management Co said it would invest in its own product as Beijing steps up efforts to put a floor under a sliding stock market. China has already announced a slew of measures, including share purchases by state fund Central Huijin, to stem declines in a stock market (.CSI300) that last week hit the lowest level since 2019. Amid government calls to revive the market, more than 20 listed companies, including Hainan Mining Co (601969.SS), Vatti Corp (002035.SZ) and Zhejiang Sanmei Chemical (603379.SS), unveiled share buyback plans or proposals late on Sunday. In addition, companies such as CRRC Corp (601766.SS) and Wuxi Lead Intelligent Equipment (300450.SZ) disclosed share purchase plans by their controlling shareholders. ($1 = 7.3145 Chinese yuan renminbi)Reporting by Samuel Shen and Tom Westbrook; Editing by Lincoln FeastOur Standards: The Thomson Reuters Trust Principles.

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Persons: Samuel Shen, Tom Westbrook, Lincoln Organizations: E Fund Management, Central, Hainan Mining Co, Vatti Corp, Chemical, CRRC, E, CSI, Huijin, Shanghai Securities, Thomson Locations: SHANGHAI, Beijing, China, Hainan, Zhejiang, Wuxi