I suspect the answer lies in this blurb after looking at the size of the transaction in your T&S shot~55M...somebody got a bunch of shares...
Delivery of Securities
NASD (now known as FINRA) Rule 11310 - Book-Entry Settlement A member shall use the facilities of a securities depository for the book-entry settlement of all transactions in depository-eligible securities with another member or a member of a national securities exchange or a registered securities association.
A member shall not effect a delivery-versus-payment or receipt-versus-payment transaction in a depository-eligible security with a customer unless the transaction is settled by book-entry using the facilities of a securities depository.
This rule requires broker-dealers to deliver securities using book-entry settlement, which is an electronic system of custody, transfer and settlement that does not use the physical security certificates. It allows shares to move electronically through the Depository Trust Corporation (DTC) system and allows fast and accurate transfers of securities with simultaneous cash settlement. Book-entry settlement can be used only when the securities are listed in the customer's name but registered to the broker-dealer.
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