Analyzed experimental data and molecular dynamics data for "Composition-Dependent Dynamics in a Multicomponent Supercooled Liquid Measured with Nanometer Spatial Resolution". Raw experimental data is in a separate archive, DOI: (TBA). Archive includes electron correlation microscopy and symmetry coefficient analysis of experimental 5D STEM data on Pt57.5Cu14.7Ni5.3Pt22.5 and Pd43Cu27Ni10Pt20 supercooled liquids and molecular dynamics trajectories computed with a machine-learning potential for Pt57.5Cu14.7Ni5.3Pt22.5 and associated analyses.