The authors investigate the extent to which intra-week seasonality still exists and whether its pattern is uniform across three stock indices and Treasury bonds with seven different maturities. They find that intra-week seasonality continues to be significant and that its pattern is not uniform, either between the stock indices and the Treasury bonds or even among the bonds alone. A pattern shared by stocks and bonds is that Monday returns become increasingly negative with maturity. These findings suggest that neither institutional nor general-equilibrium explanations by themselves can explain the pattern of intra-week seasonality in securities markets.