脑动极光-B（06681）今日盘中股价大跌5.09%，引起市场关注。该公司股价的突然下跌可能与一笔大宗交易有关。
据报道，在上午9:20左右，脑动极光-B出现一笔大手卖出，成交量为76.9万股，成交价为12.46港元，涉及资金约958.174万港元。这笔大宗交易可能引发了市场对该股的抛售压力，导致股价快速下跌。
值得注意的是，脑动极光-B昨日曾被纳入港股通，并在当天上涨16.5%，成交金额达61.77亿元，位列全日第6大成交金额股份。今日的大跌可能也与投资者获利回吐有关。投资者应密切关注该股后续走势，并留意公司可能发布的相关公告。
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