Intellectual property boutiques Fish & Richardson; Finnegan, Henderson, Farabow, Garrett & Dunner; and Sterne Kessler Goldstein & Fox maintain dominant positions in America Invents Act litigation, but global Am Law 50 firms continue making inroads at the PTAB.

That’s one of the takeaways from Lex Machina’s annual review of AIA litigation at the Patent Trial and Appeal Board. Lex Machina’s data also show that Apple Inc. and Samsung Corp. remain the most frequent petitioners, but pharmaceutical companies are starting to crack the top 10 on both the petitioner and patent owner side.