5月21日，沪指跌2.04%，深成指跌2.07%，创业板指跌2.35%。两市成交额3.48万亿，较上个交易日放量5279亿。数据显示，今日大盘主力资金净流出1451.47亿。汽车零部件、家电零部件Ⅱ、光学光电子等板块主力资金流入排名居前，其中汽车零部件净流入32.04亿元。
主力净买入个股中，三花智控排名第一，主力净买入20.35亿元；京东方Ａ排名第二，主力净买入14.77亿元。
主力净卖出个股中，光迅科技排名第一，主力净卖出34.28亿元；东山精密排名第二，主力净卖出27.54亿元。
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