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

今天登錄fidelity 賬戶,發現Activities 裏麵,上個月有一項activity是"Change in Market Value" transaction, 是一筆數目不算太小的進賬。可我上個月連賬戶都沒進去過,哪來的這筆transaction? 而且這筆錢顯示是進了我的賬戶,但我賬戶的總額並沒增加。這是怎麽回事?大家有遇到過這種情況嗎?

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