This thirteenth annual report of the administrator of the international transaction log (ITL) provides information to the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol (CMP) on the activities of the ITL administrator for the period from 1 October 2016 to 30 September 2017. This report also contains information on transactions of Kyoto Protocol units, including on carried-over units, as requested at CMP 6, and information on the outcomes of the 19th Registry System Administrators Forum, which took place on 28 and 29 September 2017 in Berlin, Germany. The CMP, by decision 12/CMP.1, requested the Subsidiary Body for Implementation (SBI) to consider, at its future sessions, the annual reports of the ITL administrator. The SBI may wish to take note of the information contained in this report and to provide guidance to the secretariat and Parties, as necessary, concerning the implementation of registry systems.