The Sim4 complex is required for loading the DASH complex onto the kinetochore via interaction with dad1. Has a role in the maintenance of core chromatin structure and kinetochore function. Located in the inner regions of the centromeres and is essential for sister chromatid segregation during the G1/S phase following mitosis. Required for the localization of cnp1 to the centromere. {ECO:0000269|PubMed:10864871; ECO:0000269|PubMed:16079914}.