Critical-infrastructure organizations do not operate alone. They run through EPCs, OEM remote support, cloud platforms, staffing vendors and a long tail of software. Each of those relationships is a path into systems that were designed for reliability first.
Third-party risk work is the practice of examining those paths: questionnaires, control assessments, onboarding and offboarding reviews, remediation tracking and supplier reporting. Done poorly, it becomes a spreadsheet graveyard. Done properly, it changes who is allowed onto a network and when access is removed.
The work is not only cybersecurity. It is procurement, legal, operations and project delivery sharing a common picture of vendor exposure. That is why Supreme Power Hubs presents Third-Party Risk & Vendor Security as its own capability, with roles such as third-party risk analyst, vendor risk specialist and third-party risk manager.
Owners who wait until a contractor is already on the network are not doing risk management. They are documenting an exception.
This briefing describes a professional practice. It is not a claim that Supreme issues certifications or operates a regulated assessment body.