深交所公开信息显示，5月21日，同大股份董秘、董事张莎在竞价交易公司股票，增持股数0.04万股，成交均价21.1元，变动金额8.44万元元，变动后持股数为8.44万元。
近一个月来，同大股份共出现1次高管增持，增持总数0.40万股。
同大股份董秘张莎增持0.04万股，成交均价21.1元
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