Omnibus risk structures were effective in an environment of limited scale and homogeneous counterparties. As institutional OTC markets have expanded, those same structures have become sources of hidden concentration and balance-sheet fragility.
Segregation represents a structural response to this shift. By localising exposure and enforcing attribution, it transforms systemic risk into manageable, unit-level risk. The decline of omnibus risk is therefore not a regulatory artefact, but a consequence of how institutional markets now operate.
The implication is clear: resilience in modern OTC markets depends less on monitoring pooled exposure and more on designing systems where exposure cannot silently aggregate in the first place.