Vendor concentration risk in plain terms
Most third-party programmes assess vendors one by one, but concentration risk appears in clusters. If multiple key suppliers depend on the same identity provider, cloud region, or managed service partner, a single disruption can cascade through business units at once.
What to change
The practical fix is not another scoring layer. Build a dependency map for top-tier suppliers, then monitor for overlap in hosting, critical subcontractors, and access pathways. Teams that do this early reduce blind spots and avoid expensive response cycles.
Operating cadence
A monthly concentration review with procurement, security, and resilience owners gives decision-makers an actionable list: where to diversify, where to add controls, and where contingency planning is mandatory.