As of December 31, 2015, the PTAB had reached a final disposition on 2,749 petitions for inter partes review (IPR), post-grant review of a covered business method (CBM), or post-grant review (PGR). Of that number, roughly half (1342) resulted in institution, of which 817 resulted in a final written decision. This two-part series will provide a summary of what were the most important, or at least most interesting, decisions of 2015.