Rate of GW progenitor events per comoving volume as a function of lookback time and redshift in four different boxes of the MTNG simulation suite: MTNG46, MTNG92, MTNG185, and MTNG740 (from left to right). The total progenitor merger rate and the contribution of different compact binary merger channels are displayed as indicated in the legend. Colored bands represent constraints on the low-redshift (z ≈ 0) merger rate of the different channels, as inferred from GWTC-4 high-confidence events (LVK25).