Fidelity "Change in Market Value" - what is this?

今天登录fidelity 账户,发现Activities 里面,上个月有一项activity是"Change in Market Value" transaction, 是一笔数目不算太小的进账。可我上个月连账户都没进去过,哪来的这笔transaction? 而且这笔钱显示是进了我的账户,但我账户的总额并没增加。这是怎么回事?大家有遇到过这种情况吗?

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