NPEs in the US: who's doing the suing?

Which non-practising entities (NPEs) are filing patent infringement suits in the United States? We have found a great table depicting new NPE litigation over the past eight months thanks to Article One Partners, whose crowd-sourcing of devastating prior art to blast unpopular patents off the face of the Earth looks must seem particularly attractive if one of these businesses comes knocking at your door:

This information comes from PatentFreedom, whose chairman and founder is Daniel McCurdy, whose patent risk management company RPX Corporation acquired it earlier this year.