Third-party risk starts with a problem most vendor risk management programs don’t solve: you can’t assess the vendors you don’t know you have. A vendor gets onboarded, someone sends a questionnaire, the answers come back, the file closes, and twelve months later the vendor is due for review again. But this process only covers the vendors that make it into the system in the first place.

According to Vanta’s study, more than half of a typical organization’s vendor footprint is now shadow IT, and only 2% of those vendors ever receive a security review. 70% of companies have shadow AI running somewhere nobody assessed. The issue is that most third-party risk management (TPRM) programs are built around an annual cycle that assumes you already know who your vendors are. And since shadow IT makes the vendor inventory incomplete, everything downstream, from tiering and assessment to monitoring, is incomplete too.

Evaluating a TPRM platform today is less about questionnaire features and more about asking critical questions: Does the vendor inventory build itself, or does it wait to be told? Does review effort scale past a few hundred vendors without proportional headcount? And, do vendor findings reach the rest of your risk program, or stop at the edge of a separate tool?

The answers can be found in eight distinct criteria.

The eight criteria

Our eight criteria focus on whether a platform can give enterprise teams a complete vendor picture and manage risk throughout the TPRM lifecycle. Each criterion also covers:

• What a capable vendor risk management solution should do
• Associated questions you can ask TPRM software vendors during evaluation

1. Automated vendor, shadow-IT, and AI discovery

The first test of a TPRM platform is whether it can build a complete vendor inventory that accounts for shadow AI. That way, your vendor risk assessments, tiering, and monitoring derived from the vendor inventory remain defensible.

What good looks like: The TPRM platform’s vendor inventory should build itself from identity, expense, and endpoint signals, including tools employees adopt outside procurement. Check specifically how AI tools surface, since they often arrive through expense claims and browser extensions rather than procurement.

Ask: Do you discover vendors automatically across identity providers and surface shadow IT? Can you flag AI tools specifically, and which signals do you use to identify them?

How Vanta approaches it: Vanta’s agentic TPRM solution offers automatic vendor discovery that surfaces vendors across connected systems and extends monitoring across what it finds. It also integrates with your existing procurement systems to close shadow IT and AI blind spots.

2. Inherent risk scoring and vendor tiering

At enterprise scale, not every vendor warrants the same level of due diligence. A TPRM platform should use inherent risk to tier vendors and determine the appropriate review depth for each. Without that distinction, the sheer review volume can quickly overwhelm security teams.

What good looks like: Prioritize getting a rubric you can reshape, not a fixed scale you inherit. The dimensions and their weightings should match how your organization actually defines criticality.

Ask: How does the platform score inherent risk? Will my team be able to add, remove, or adjust the rubric’s dimensions and weightings?

How Vanta approaches it: Vanta provides fully customizable risk rubrics, where you can edit to add, adjust, and remove metrics and weightings, as well as customize risk level groups and dimensions. Pre-configured categories cover data types, business criticality, integration access, and communication scope.

3. Agentic AI security reviews

Manual questionnaire-and-spreadsheet reviews take days per vendor and don’t scale effectively. When evaluating top AI-powered TPRM platforms, look at how much of the assessment the AI actually handles versus how much still depends on a person gathering the information first.

What good looks like: An AI agent collects evidence, follows up with the vendor, reviews documents, and drafts the findings end to end. The platform should also point to where time is being saved: evidence gathering and the review itself are different bottlenecks, so improving one doesn’t necessarily improve the other.

Ask: Does AI run the assessment end-to-end, or only summarize? Can evidence and findings be reused across assessments? What happens when a vendor doesn't respond? What happens when a vendor goes quiet, as that’s where automation often stops and humans have to take over?

How Vanta approaches it: Vanta’s AI agent runs vendor reviews end-to-end, collecting and requesting evidence, reminding vendors, flagging findings, and writing the summary. This kind of support can reduce risk assessment time by up to 50%: across ~6,000 reviews, teams have cut risk assessment time by 50%, with average completion time falling from 19.3 days to 10.5. One head of information security and privacy also reported that Vanta AI cut their vendor review time by over 80%.

4. Continuous monitoring

Point-in-time assessments miss changes between annual reviews, so a TPRM platform should continuously monitor vendors for changes that could introduce new risk.

What good looks like: Monitoring runs continuously against vendor posture and attack surface, showing severity and recommended action alongside the risk score. Also, look for alert quality as much as coverage because a weekly rating with no context creates work instead of reducing it, and teams may eventually stop paying attention.

Ask: Is continuous monitoring native or an add-on, and what does it cover? How often are vendor assets scanned? Do alerts carry severity and recommended action?

How Vanta approaches it: Vanta’s risk solution enables continuous monitoring of vendor security practices and attack surfaces, including fourth-party risks, replacing point-in-time reviews with real-time risk alerts.

5. Risk register and GRC integration

Vendor risk managed in isolation can’t be reported as a coherent posture. Your TPRM platform should connect vendor findings to your risk register and broader GRC program, so teams can see how third-party risks fit into the organization’s overall risk posture. Avoid standalone tools that produce a second set of numbers that needs to be reconciled every quarter.

What good looks like: Vendor findings land in the same register as enterprise risk and map to framework controls, so third-party evidence counts once across obligations and you don’t have to recapture them per framework.

Ask: Do vendor findings flow into a central risk register and compliance controls, or stay in a separate module? How does TPRM evidence map to framework controls?

How Vanta approaches it: Vendor findings feed directly into your risk register and compliance posture, giving one view of risk instead of fragmenting it across tools.

6. Procurement integration and intake

Risk decisions must happen at the point of purchase. TPRM solutions that integrate with procurement workflows will help you assess vendors before a contract is signed, when there’s still time to influence the decision.

What good looks like: Intake forms trigger a review automatically and help determine inherent risk so triage can happen without manual routing. The sharper test is whether intake can actually surface meaningful gaps.

Ask: Do you integrate with our procurement tooling and auto-trigger review at intake? Can intake determine inherent risk automatically? Can the platform block or escalate for deeper due diligence when a vendor presents higher risk?

7. Third, fourth, and Nth-party risk

Breaches can originate deeper in the supply chain than your direct vendors. A TPRM platform needs to give you visibility beyond your direct vendors and keep that visibility current as their third-party relationships change. However, available platforms vary in how deeply they can map those relationships and how that information feeds into ongoing risk monitoring.

What good looks like: Subprocessors and their subprocessors are visible, and the mapping is regularly refreshed after vendor onboardings.

Ask: Do you monitor fourth-party and subprocessor risk out of the box, or only direct vendors? How do you keep these mappings accurate after onboarding, especially when vendors change subprocessors? Do those changes trigger alerts, or only surface during the next review?

8. Implementation speed and total cost of ownership

Highly configurable platforms often need internal administrators and long deployments. These costs are easy to miss during evaluation since they typically surface a year after deployment. Implementation effort is also something you should consider when estimating costs. Particularly, time spent maintaining integrations, configuring workflows, and supporting integrations can stack up.

What good looks like: The platform helps you complete a vendor review within weeks, without dedicated admins. Integrations and workflows are manageable without ongoing engineering or administrative support.

Ask: What's a realistic implementation time-to-value? Does the platform need dedicated administrators? How much ongoing work is required to maintain integrations and workflows? What is your largest production deployment by vendor count? Which of your customers operate the platform day-to-day, and how much internal support does that require?

Questions to take into a vendor call

By the time you get to a vendor call, you should have a clear sense of what your enterprise needs from a TPRM platform. Use these questions to test whether the platforms on your shortlist can deliver in practice:

1. Do you discover vendors automatically across identity providers and surface shadow IT?
2. Can you flag AI tools specifically, and what signals do you use?
3. How is inherent risk scored, and can the rubric's dimensions and weightings be adjusted?
4. Does AI run assessments end-to-end or only summarize?
5. What happens when a vendor doesn't respond to an evidence request?
6. Can evidence and findings be reused across assessments?
7. Is continuous monitoring native or an add-on, and how often are assets scanned?
8. Do alerts carry severity and recommended action, or only a score?
9. Do vendor findings flow into a central risk register and map to framework controls?
10. Do you integrate with procurement and auto-trigger reviews at intake?
11. Do you monitor fourth-party and subprocessor risk and how is the mapping kept current?
12. What is your largest production deployment by vendor count?

Buying an enterprise TPRM platform: The bottom line

The best TPRM platforms are those that fit how your organization actually manages vendor risk. They reduce the manual work involved in discovering vendors, assessing them, and keeping their risk current without creating another parallel system for your team to maintain. The eight criteria above give you a way to test that before you commit.

If you want to compare specific platforms, you can explore these guides:

• Vendor-by-vendor breakdown of TPRM software
• Top TPRM software comparison for enterprises
• How enterprises evaluate risk software