We show heterogenous displacement effects of mandatory occupational pension savings on private household wealth for different groups. This contributes to explaining why empirical studies often come with different estimates of this effect. We study the case of the Netherlands, where wage employed and self-employed are differently exposed to compulsory pension savings, and the institutional setting provides exogenous variation in pension wealth that can be used as instrument in the analysis. We use rich administrative data on (pension) wealth and income combined for the first time to supervisory data of pension funds. Our results show a displacement effect of -31% for wage employed and of -61% for self-employed. The higher displacement effect we find for self-employed might be explained by the fact that self-employed are arguably more aware of their pension accrual, or lack thereof, because there is no employer who pays their pension premiums or adds an employer contribution.