During the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition, ambient total suspended aerosol particles were collected on polycarbonate filters (pore size 0.8 µm) for chemical and microphysical offline analyses. Each filter was sampled for approximately one week and stored frozen until analysis. This study presents the atmospheric concentrations of key inorganic ions (e.g., chloride, sulfate, sodium, ammonium), as well as methanesulphonate (MSA-), oxalate, and formiate. Analyses were performed at the Atmospheric Chemistry Department (ACD) of the Leibniz Institute for Tropospheric Research (TROPOS) in Leipzig, using ion chromatography (IC) according to the ACD's standard protocol. Filter sampling during the MOSAiC drift was conducted by the ATMOS team, with special acknowledgment to Amélie Kirchgaessner, Lauriane Quéléver, Ivo Beck, Markus Frey, and Manuel Dall'Osto.