Having filed roughly 30 new cases since June 1, and more than 100 new suits since the start of 2019, prolific inventor and patent plaintiff Leigh M. Rothschild is poised to land—for the fourth year in a row—among this year’s most frequent NPE plaintiffs. (To view the 2018 list of the most frequent NPE plaintiffs, see the “Patent Litigation and Marketplace Report” that RPX published on Insight this past March.) Historically, Rothschild (through various associates) has asserted in litigation patents on which he is a named inventor, or, as was particularly the case in 2017-2018, patents acquired from Intellectual Ventures LLC (IV). Now, public records indicate that Rothschild looked to a new source for patents to assert in his latest campaign, which was recently kicked off with suits against Adobe and Blackbaud.