They are likely to be crossed-trades between different BOA...

They are likely to be crossed-trades between different BOA accounts all in the name of deceiving the investing public. They generally have the NXXT code next to them. They are used by a broker to move shares between two clients or between two of their own accounts. As they are just moving the furniture in their own company, they aren't really jumping the queue but you have to question their motives. All part of the act programmed into their alogorithms in my opinion.