Square is a huge aggregator, claiming >1 million merchant customers. Not sure who will want to buy them given the recently announced changes to Visa's FANF that will impact aggregators who will now need to report individual tax ID info for merchants rather than use a Master Tax ID. From a recent article in Digital Transactions:

"This change is also likely to require considerable system work for aggregators and their processors, which starting next April will have to track volume and compute fees for merchants individually rather than collectively."