Not certain, but I've seen this pattern with other dividend stocks when a one time or special dividend is about to be paid. It may be some type of adjustment in pps to somewhat offset the upcoming divi.
Doesn't completely make sense in theory though because these shares are being traded on the secondary market, and the divi is usually fixed at an amount per share, so pps should make no difference to the company with respect to the divi. All I know is I've seen the pattern with other stocks and have no other explanation.
Great opportunity to average down imo.
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