Similar work was done last year based on Lex Machina data: http://scholarship.law.duke.edu/cgi/viewcontent.cgi?article=1239&context=dltr http://scholarship.law

Similar work was done last year based on Lex Machina data: http://scholarship.law.duke.edu/cgi/viewcontent.cgi?article=1239&context=dltr http://scholarship.law.duke.edu/cgi/viewcontent.cgi?article=... https://lexmachina.com/media/press/aia-500-expanded/ https://lexmachina.com/media/press/aia-500-expanded/ They use a different term, "patent monetization entity", that is a little better calibrated than NPE or troll.