Cash-rich acquirers on average perform better than their cash-poor counterparts. This observation is driven by financially constrained acquirers and by the deals made between the 1990s and 2000s. It is robust to alternative measures of financial constraints, to both the short term and the long term, and to the different institutional setting such as the U.K. We conclude cash richness primarily reflects acquirer managers' private information of deal quality instead of agency costs. The precautionary motive can explain the positive cash holdings effect on acquirer performance.