G-SIB designation masks AI governance variance for individual institutions.
Twenty-eight institutions are designated globally systemically important by the Financial Stability Board. Their MAR® band distribution sits one band above the non-G-SIB cohort on average. The cohort spans four MAR® bands, with within-cohort variation comparable to the non-G-SIB cohort. The designation predicts a group average. It does not predict any individual institution.
Each bar groups institutions by their MAR® band tertile. Within each bar, the navy block above the lower segment represents the G-SIB share. Twenty-eight G-SIBs cluster mostly in the C+ to B band range, but the same range holds 178 non-G-SIBs. Knowing an institution carries the G-SIB designation concentrates the cohort in a tighter band envelope and but tells you nothing about whether that specific institution sits at band D or band B+. Knowing it is not designated tells you even less.