ATLAS Collaboration2018-11-052018-11-052017-05-18Atlas Collaboration, Aaboud, M., Aad, G. et al. Eur. Phys. J. C (2017) 77: 317. https://doi.org/10.1140/epjc/s10052-017-4852-3https://hdl.handle.net/1808/27223During 2015 the ATLAS experiment recorded 3.8fb−1 of proton–proton collision data at a centre-of-mass energy of 13TeV. The ATLAS trigger system is a crucial component of the experiment, responsible for selecting events of interest at a recording rate of approximately 1 kHz from up to 40 MHz of collisions. This paper presents a short overview of the changes to the trigger and data acquisition systems during the first long shutdown of the LHC and shows the performance of the trigger system and its components based on the 2015 proton–proton collision data.© CERN for the benefit of the ATLAS collaboration 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.https://creativecommons.org/licenses/by/4.0/Article10.1140/epjc/s10052-017-4852-3openAccess