Definitely the URNM rebalance, basically by close of market yesterday URNM would have needed a certain number of shares in AEE and so bought up that number at the close.
My guess is that becuase AEE has relatively outperformed most Uranium stocks since the last rebalance, they will now have a higher weighting in the fund therefore more shares were required for purchase.
AEE Price at posting:
34.0¢ Sentiment: Buy Disclosure: Held
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