Data and example of raw experimental movie from "Soft matter mechanics of immune cell aggregates", Askari et al. (2025). Short details about all files: 20231002 11_Fig2C.avi is an example of a raw experimental movie. 20231002 11_Fig2C.txt contains all experimental details needed to analyse the above movie. CD25_Fig1D.xlsx contains the data needed to replot Fig. 1d in the manuscript. CD69_Fig1C.xlsx contains the data needed to replot Fig. 1c in the manuscript. Cells Data FINAL.xlsx contains all experimental data from the stretching experiements. DATA_Fig2C.txt contains the data needed to replot Fg. 2c in the manuscript (column 1: strain, column 2: stress in Pa). FigS2.xlsx contains the data needed to replot Fig. S2 in the manuscropt.