The flip side of an uncompleted transaction resulting from undelivered stock is called a “fail-to-receive.” SEC regulations state that brokers who haven’t received stock 13 days after purchase can execute a so-called buy-in. The broker on the selling side of the transaction must buy an equivalent number of shares and deliver them on behalf of the customer who didn’t.
Maybe that is why so many shares were bought between Aug 24- 31
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