Data associated with the paper “Metal Ion Binding to the Amyloid Beta Monomer Studied by Native Top-Down FTICR Mass Spectrometry” (Lermyte et al, J Am Soc Mass Spectrom, 2019). All 30 FTICR mass spectra are provided as human-readable .ms1 or .ms2 files. File names are composed of Ab(eta)_[attached metal]_[fragmentation technique]. Spectra are provided without any processing (including internal recalibration) other than conversion of Bruker .raw files to non-proprietary format. Data were acquired using a 12T Bruker solariX instrument. Full experimental details can be found in the paper (DOI: 10.1007/s13361-019-02283-7).