Because it was probably traded book to book or via the back-end pools. Most likely bezos' broker called other brokers/hedge funds/etc to gauge interest and one

Because it was probably traded book to book or via the back-end pools. Most likely bezos' broker called other brokers/hedge funds/etc to gauge interest and one or few of them agreed to take on the position. This happens all the time when the big boys want to open/close/rebalance large positions within a short time frame.