Wandering SMBHs near the center of MW-mass halos. The cumulative fraction of MW-mass halos in ROMULUS25 as a function of the number of SMBHs they host, including central SMBHs. All of the halos host at least one SMBH within 10 kpc from halo center, but the majority host more than that. The black line represents the entire sample, the blue dashed line is the sub-sample without major mergers since z = 0.75, and the orange dot–dash line is the sub-sample visually categorized as having a disk morphology. Hosting several wandering SMBHs is the norm for MW-mass halos (only one of the 26 in ROMULUS25 does not have any). The number of wandering SMBHs is insensitive to morphology or recent merger history.