GITNUXSOFTWARE ADVICE
Cybersecurity Information SecurityTop 10 Best Third Party Monitoring Services of 2026
Third party monitoring services roundup compares Kroll, KPMG, and RSM for risk, compliance, and oversight needs across vendors and pricing models.
How we ranked these tools
Vendors set the topic, but our editors set the inclusion criteria and the evaluation framework before research starts.
Agents extract product evidence with provenance, then collect written reviews and transcribe video reviews and podcasts.
Framework: Features 40% · Ease 30% · Value 30%
Gitnux may earn a commission through links on this page — this does not influence rankings. Editorial policy
Kroll is the best overall fit for enterprise teams that want analyst-led third-party risk monitoring, since its evidence review turns signals and questionnaire artifacts into auditable reporting with routed review and escalation workflows. KPMG is the better alternative for regulated orgs that need governance-ready, audit-style control attestation evidence trails.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Kroll
Analyst-led evidence review turns monitoring signals and security questionnaire artifacts into auditable risk reporting.
Best for: Fits when enterprises need analyst-driven third-party risk assessment with ongoing monitoring and evidence review.
KPMG
Editor pickKPMG’s evidence collection and control attestation review outputs are packaged for governance and audit-style reuse.
Best for: Fits when regulated teams need documented vendor oversight and consistent assessment evidence trails.
RSM
Editor pickManaged evidence collection and review workflow that produces decision-ready documentation tied to ongoing vendor findings.
Best for: Fits when teams need monitored third-party evidence review and tracked remediation, with governance-ready reporting.
Comparison Table
Kroll
specialistKroll provides outsourced third-party risk assessments, monitoring, and remediation support.
Analyst-led evidence review turns monitoring signals and security questionnaire artifacts into auditable risk reporting.
Kroll provides third-party risk assessment and ongoing monitoring services that support vendor and supply chain due diligence workflows. Its capabilities center on structured risk intake, evidence-led review of security and compliance materials, and coordinated risk reporting for stakeholders.
Kroll also supports regulatory and adverse media monitoring as part of an ongoing watch workflow when risk events must be surfaced with context. The service delivery model emphasizes human analysis layered onto monitoring inputs rather than relying on alerts alone.
- +Evidence-led assessments tie findings back to submitted security documents
- +Ongoing monitoring can be routed into defined review and escalation workflows
- +Structured reporting supports consistent risk narratives across vendor sets
- +Deep analyst involvement improves context quality for complex supplier ecosystems
- –Operational overhead is higher than automation-first tools
- –Data normalization across heterogeneous vendor responses can take coordination
- –Exception handling depends on defined intake scope and governance
- –APIs and automation surfaces are less central than service-led workflows
Procurement and third-party risk teams
Vendor screening during onboarding and renewal
Evidence-supported monitoring decisions
Law firms and dispute teams
Adversarial evidence review tied to monitoring
Report-ready litigation support
Show 2 more scenarios
Compliance and governance teams
Ongoing vendor watch with remediation tracking
Structured risk remediation process
Consolidates risks into required controls, evidence requirements, and remediation actions.
Security awareness program owners
Phishing simulation aligned to user follow-up
Measured user exposure
Runs segmented phishing or impersonation campaigns and connects results to training actions.
Best for: Fits when enterprises need analyst-driven third-party risk assessment with ongoing monitoring and evidence review.
KPMG
agencyKPMG delivers third-party risk program design, supplier assessments, monitoring, and governance services.
KPMG’s evidence collection and control attestation review outputs are packaged for governance and audit-style reuse.
KPMG’s monitoring and assessment engagements typically map to a governed third-party register workflow, where vendor records, risk narratives, and supporting artifacts are organized for review cycles. The service model includes evidence collection and control attestation review work products that can feed executive and risk committee reporting. KPMG also integrates external risk signals into ongoing oversight activities, which reduces manual reconciliation between questionnaires, findings, and monitoring outcomes.
A key tradeoff appears when organizations expect a fully self-service API and automation-first configuration. KPMG often delivers results through engagement artifacts and managed processes, so teams still need internal integration work for their own systems. KPMG fits when a regulated program needs documented review trails and consistent reviewer interpretation across many vendors.
- +Engagement artifacts align with governance review cycles and audit requests
- +Evidence collection and documentation are structured for controller-level scrutiny
- +External risk signals get translated into ongoing vendor oversight actions
- +Consistent assessment methodology supports multi-vendor comparison
- –Less suited for API-driven automation where teams need self-serve configuration
- –Program outcomes depend on engagement staffing and review turn times
- –Monitoring depth may require defined scope boundaries per vendor category
- –Operational ownership shifts to internal teams for system integration
third-party risk management teams
Synthesize vendor questionnaires into oversight
Faster risk committee cycles
GRC and compliance leads
Prepare audit-ready vendor documentation
Lower documentation rework
Show 2 more scenarios
security and risk operations
Maintain ongoing vendor issue tracking
Quicker remediation follow-up
KPMG incorporates external risk events into a managed remediation and escalation workflow.
procurement risk owners
Standardize assessments across suppliers
More consistent vendor decisions
KPMG applies consistent assessment interpretation across vendor segments for comparability.
Best for: Fits when regulated teams need documented vendor oversight and consistent assessment evidence trails.
RSM
agencyRSM provides third-party risk advisory, supplier assessments, control reviews, and monitoring support.
Managed evidence collection and review workflow that produces decision-ready documentation tied to ongoing vendor findings.
RSM is a third-party monitoring service tied to RSM US delivery teams, with work centered on ongoing vendor risk assessment workflows rather than only alerts. Its capabilities focus on evidence collection, review of security and compliance artifacts, and structured tracking of findings through remediation and escalation.
The service fits organizations that need controlled review steps and governance reporting tied to vendor inventory and register management. Monitoring outcomes are delivered as decision-ready documentation for third-party risk management and due diligence cycles.
- +Documentation-first monitoring output supports security questionnaire and evidence review
- +Ongoing review workflow connects vendor findings to remediation and escalation
- +Delivery model emphasizes governance-friendly decision records for risk teams
- –Requires active coordination with RSM to keep monitoring inputs current
- –Automation and API surface are not presented as a primary self-serve control
Internal audit and technology risk teams
Audit evidence and issue validation
Documented audit workpapers
Finance and compliance stakeholders
Monitoring support for reporting changes
Coordinated implementation support
Show 2 more scenarios
CFOs and finance leaders
Risk governance for continuous vendor oversight
Stronger reporting governance
Adds interim leadership guidance for reporting governance tied to internal control support activities.
Payment program owners
Evidence organization for payment card obligations
Better evidence organization
Organizes evidence, supports control testing, and manages issues and change control for payment risks.
Best for: Fits when teams need monitored third-party evidence review and tracked remediation, with governance-ready reporting.
EY
agencyEY supports third-party risk governance, due diligence, assessment, monitoring, and issue management.
Analyst-led evidence review linked to monitored change, producing consistent remediation and reporting artifacts.
EY fits organizations that need third-party risk assessment outputs to connect with monitored change over time, not just alerting on events. The strongest engagement pattern is analyst-led evidence review and structured remediation tracking that turns findings into governance-ready artifacts. This approach reduces the burden on risk owners who would otherwise reconcile free-form vendor responses into consistent reporting.
- +Governance-ready risk artifacts that translate monitoring into board-level reporting
- +Evidence and questionnaire workflows that align review work to risk control expectations
- +Engagement model supports remediation tracking with clear escalation paths
- +Integration support for connecting vendor inventory and risk reporting into GRC processes
- –Less self-serve automation for continuous external monitoring than monitoring-first vendors
- –Workflow outcomes depend on defined scope and active client data readiness
- –Deeper configuration and operating cadence needed to maintain consistent monitoring coverage
Enterprise risk and compliance teams
Annual cycle support with continuous monitoring
Faster audit-ready risk updates
Third-party risk managers
Remediation tracking across high criticality vendors
Reduced time to closure
Show 2 more scenarios
Internal audit and assurance
Evidence-backed control attestation preparation
Cleaner assurance documentation
Reviewed vendor documentation and monitoring outputs feed consistent internal audit evidence sets and exception handling.
GRC program operations
Centralized reporting from multiple vendor sources
Lower reconciliation effort
EY engagement connects vendor records and risk outputs into GRC reporting workflows used by program stakeholders.
Best for: Fits when enterprise programs need monitored third-party risk plus governance and assurance-grade workflow delivery.
Optiv
specialistOptiv provides third-party cyber risk assessments, supplier monitoring, and remediation advisory services.
Signal-to-escalation workflow design that converts external changes into documented evidence review and closure steps.
Optiv is a strong fit when third-party oversight requires repeatable workflows across intake, evidence handling, and follow-up, not only alerts. The monitoring approach centers on collecting externally available signals and routing them into review and escalation steps for risk owners. Engagement quality tends to be high for teams that want implementation support for data feeds, vendor inventory mapping, and control validation workflows.
- +Managed monitoring workflows with clear escalation from signal to action
- +Evidence collection and review support for security and compliance artifacts
- +Governance-friendly process design for vendor exceptions and remediation tracking
- +Integration support for vendor inventory alignment and recurring monitoring
- –Outcome quality depends on defined ownership and vendor criticality tiering
- –Workflow depth can require client time for intake and evidence mapping
- –Automation without clear routing rules can create excess review workload
- –Some capabilities may require add-on scope for specialized monitoring needs
Third-party risk managers
Ongoing vendor monitoring with escalation
Fewer missed escalations
Security compliance teams
Evidence-centric questionnaire follow-up
Faster evidence closure
Show 2 more scenarios
Vendor governance teams
Exception handling and remediation tracking
Better exception throughput
Tracks issues through review, assignment, and closure using governed remediation steps.
Risk analytics and operations
Aligning vendor inventory to monitoring
Higher coverage accuracy
Helps map vendor records to monitoring inputs and recurring review triggers.
Best for: Fits when compliance teams need managed continuous monitoring tied to evidence and documented follow-up.
Deloitte
agencyDeloitte delivers third-party risk management consulting and managed monitoring services.
Audit report review and evidence collection workflows executed through Deloitte delivery, mapped to remediation tracking and escalation.
Deloitte operates as a managed third-party risk consulting and monitoring organization that combines risk assessment delivery with ongoing review work for global vendor ecosystems. Its strengths concentrate on governance artifacts like audit report review workflows, evidence collection support, and risk remediation tracking tied to third-party register management.
- +Document-led audit report review workflows for vendor oversight
- +Structured evidence collection support across security questionnaires
- +Defined issue escalation paths tied to vendor risk remediation tracking
- +Strong governance framing for third-party register maintenance and reporting
- –Monitoring outcomes depend heavily on engagement delivery and intake quality
- –No clearly documented developer-focused monitoring API for automation-first teams
- –Exception management requires manual alignment with internal processes
- –Configuration and governance controls need vendor-risk program maturity
Legal operations and governance teams
Governed workflows for legal oversight of vendors
Controlled legal workflows
Healthcare interoperability program teams
Vendor monitoring for data exchange governance
More consistent data exchange
Show 2 more scenarios
Enterprise transformation leaders
Register-linked monitoring for transformation programs
Aligned workstreams and decisions
Redesigns operating models and coordinates workstreams that depend on vendor risk governance inputs.
Real estate portfolio investors
Portfolio monitoring for tax review workflows
Traceable tax workflows
Reconciles tax bills, supports appeals, and tracks deadlines across properties with traceable workflows.
Best for: Fits when enterprises need governance-grade vendor monitoring outputs and escalation workflows.
Protiviti
agencyProtiviti provides third-party risk assessments, program governance, monitoring, and remediation services.
Issue escalation and remediation tracking are treated as part of the monitoring lifecycle, not as a separate downstream process.
Protiviti, known for risk and compliance advisory delivery, provides third-party monitoring services that pair continuous vendor oversight with structured evidence workflows. The offering is distinct in how monitoring results are tied to governance actions like issue escalation, remediation tracking, and executive-ready reporting.
- +Advisory-led workflows tie monitoring outputs to remediation and escalation paths
- +Audit-ready evidence handling supports reviews of security and compliance artifacts
- +Governance reporting formats fit third-party risk program steering and oversight
- +Structured reviews support consistent risk scoring and documentation across vendors
- –Workflow depth depends on engagement configuration and governance discipline
- –Less suited to teams wanting a purely self-serve monitoring UI
Third-party risk and information security teams
Vendor and subcontractor monitoring with closure
Remediation status documented
Payments and fraud security teams
Monitoring governance for fraud controls
Investigation-ready processes
Show 2 more scenarios
Enterprise compliance and risk teams
Regulatory evidence and remediation governance
Tracked corrective actions
Supports control mapping, evidence workflows, and remediation governance across regulatory requirements.
Financial institution risk teams
Finance planning risk governance for lending controls
Structured risk governance
Advises on credit governance and model or lending controls that inform vendor risk monitoring.
Best for: Fits when regulated organizations need evidence-led third-party monitoring tied to governance decisions.
PwC
agencyPwC provides third-party risk strategy, supplier assessments, monitoring, and remediation services.
Governance-first monitoring and assessment outputs designed for leadership reporting, issue escalation, and evidence-based oversight.
PwC is a third party monitoring and risk advisory organization with deliverables that fit governance-heavy vendor risk programs rather than point solutions for evidence collection. Its core strength comes from managed third-party risk assessment workflows that translate vendor information into risk views for leadership reporting.
- +Analyst-driven monitoring tied to client governance and reporting artifacts
- +Structured vendor risk assessment deliverables suitable for audit and oversight workflows
- +Regulatory watch and adverse media monitoring handled as managed workstreams
- +Executive-ready risk communication built from assessed vendor information
- –Monitoring depth depends on engagement scope and required evidence formats
- –Integration depth and API automation are not the focus compared with tooling-first vendors
CISOs and enterprise risk teams
Third party monitoring for cloud and identity controls
Prioritized security improvements
Deal teams and technology executives
Vendor due diligence monitoring for transactions
Remediation roadmap created
Show 2 more scenarios
Enterprise resilience leaders
Third party monitoring for continuity readiness
Clear response responsibilities
Designs crisis operating models and exercises that account for vendor-related disruption responsibilities.
Broadcasters and telecom organizations
Monitoring governance during media platform migration
Delivery controls aligned
Supports migration planning and procurement governance across vendor programs with controlled requirements.
Best for: Fits when regulated teams need managed assessments and monitoring artifacts for oversight and audit trails.
IBM Consulting
agencyIBM Consulting delivers third-party cyber risk assessments, governance, monitoring, and remediation support.
Governance-first operating model that turns monitoring findings into escalations, evidence, and audit-ready reporting workflows.
IBM Consulting delivers third-party monitoring as an outcomes-driven services engagement tied to broader IBM risk, security, and governance programs. IBM Consulting’s core capability is productionizing vendor risk workflows through consulting-led integration with identity, evidence, and reporting systems rather than selling a single monitoring widget.
- +Consulting-led workflow design for issue escalation and governance approvals
- +Integration approach that aligns monitoring signals to internal risk reporting formats
- +Evidence collection and attestation workflows connected to third-party onboarding
- +Strong fit for enterprises standardizing third-party registers and control outcomes
- –Service-led delivery increases dependency on internal stakeholders for data access
- –Monitoring depth is tied to engagement scope and may not cover every niche data feed
- –Automation maturity depends on the selected integration architecture and governance model
- –Admin controls and RBAC detail may require additional enablement work during rollout
IT asset managers and compliance leaders
Third party monitoring linked to asset lifecycle governance
Traceable asset records
Data platform and governance teams
Partner monitoring using governed data product catalogs
Reusable data products
Show 2 more scenarios
Digital commerce operations teams
Operational governance for vendor-driven commerce changes
Connected commerce operating model
Coordinates commerce operations changes so monitored third parties connect to fulfillment and returns workflows.
Transformation program offices
Enterprise program delivery with vendor monitoring governance
Coordinated delivery plans
Provides architecture, integration, security, and execution support that ties monitoring governance to delivery plans.
Best for: Fits when enterprise governance needs integration-heavy third-party monitoring across a full vendor lifecycle.
Accenture
agencyAccenture provides third-party risk transformation, supplier governance, monitoring, and managed services.
Managed delivery that ties monitoring alerts to issue escalation and remediation tracking across the third-party lifecycle.
Accenture delivers managed third-party risk work that combines vendor risk assessment, evidence review, and ongoing monitoring into an execution service. Capabilities center on intake of vendor inventory, workflow-based due diligence support, and structured reporting outputs tied to risk scoring and exception handling.
- +Operationalizes vendor due diligence workflows with structured review and evidence handling
- +Produces governance-ready risk reporting through managed assessment execution
- +Supports exception management with documented escalation and remediation tracking
- +Integrates monitoring outputs into ongoing third-party oversight processes
- –Monitoring outcomes depend on engagement configuration and workflow design
- –Requires enterprise involvement to maintain vendor inventory and review throughput
Telecommunications innovation teams
Monitoring governance for emerging technology pilots
Operational readiness path
Chief information security leaders
Cyber transformation aligned to monitored vendors
Sequenced transformation plan
Show 2 more scenarios
CFO organizations and finance teams
Monitoring support for reporting and audit trails
More consistent finance reporting
Connects finance data sources to reporting and reconciliation workflows with auditable handoff reduction.
Enterprise marketing procurement teams
Vendor governance for media procurement monitoring
Controlled media buying
Orchestrates vendor governance across markets and links monitoring to campaign execution and analysis.
Best for: Fits when enterprise programs need managed third-party oversight with review governance and escalation.
Conclusion
After evaluating 10 third party monitoring, Kroll stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
Frequently Asked Questions About Third Party Monitoring
How do Armis Security and TransUnion Risk typically handle vendor onboarding and ongoing monitoring as a single workflow?
Which service providers build evidence collection and audit-ready documentation during monitoring, not after alerts?
What breaks if continuous monitoring signals are not mapped to issue escalation and remediation tracking?
How do SSO and RBAC requirements affect administration of third-party monitoring services like Deloitte and EY?
How is data migration handled when moving vendor inventories and risk data into a monitoring program managed by Kroll or RSM?
When does integration via API and automation matter more than document-based questionnaires in third-party monitoring?
What tradeoff exists between analyst-led evidence review models and alert-first monitoring dashboards in services like Kroll and PwC?
How do admin controls and exception management show up in day-to-day workflows for Accenture and Deloitte?
Which providers offer extensibility for connecting third-party monitoring outputs into existing third-party risk programs?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
How to Choose the Right Third Party Monitoring
Third party monitoring options differ most in how they turn vendor telemetry into actions, especially when you look at alerting rules, evidence coverage, and API-driven automation. We focus on what your team can configure and prove, not on broad security claims.
Alert rules and escalation paths
Why it matters
Alert rules and escalation paths determine whether third party monitoring produces usable notifications or noisy pings. The workflow also affects how quickly exceptions reach the right owner.
How to check
Ask for a demo scenario: create a rule that triggers when a monitor condition changes, then show where the alert routes. Confirm you can set thresholds, assign recipients, and test the escalation timeline end to end.
Evidence retention for monitoring events
Why it matters
Evidence retention for monitoring events matters when you need to review what happened and when, without rebuilding context. It also affects the credibility of internal reviews during vendor disputes.
How to check
Request a sample event page and check what fields are stored (timestamps, source, change summary). Try exporting or viewing a past event at two different dates to confirm the history stays available.
Coverage of third party signals
Why it matters
Coverage of third party signals determines how well third party monitoring reflects real-world changes. If key sources are missing, your team will see gaps and rely on manual follow-ups.
How to check
In the demo, pick two or three vendor identities from a sample list and ask which signal types will appear. Ask what can be added or substituted when a signal source is unavailable for a specific vendor.
API and automation for vendor provisioning
Why it matters
API and automation for vendor provisioning reduce manual steps as your vendor list grows. Deep API support also lets you keep third party monitoring in sync with your internal systems and naming conventions.
How to check
Ask to see the API endpoints for adding a vendor, updating attributes, and pulling monitoring status. Use the sandbox or API explorer to create a vendor, then verify the change appears in the monitoring queue.
RBAC and audit log for monitoring actions
Why it matters
RBAC and audit log for monitoring actions protect the workflow around alerts, exceptions, and evidence edits. You also need traceability when multiple analysts manage the same vendors.
How to check
Ask to create roles with limited permissions and confirm who can view evidence versus edit alert rules. Trigger a change (like adjusting a rule) and verify there is an audit log entry with actor and timestamp.
Red flags
- Alerts show up but escalation settings can’t be demonstrated end to end
- Past monitoring events lose context or key fields after a short window
- API access doesn’t cover vendor creation or status retrieval needed for automation
Fit by situation
- If your analysts handle alerts daily, prioritize Alert rules and escalation paths to prevent noise and misroutes.
- If you must review what changed during vendor reviews, prioritize Evidence retention for monitoring events so context stays intact.
- If you feed vendor lists from internal systems, prioritize API and automation for vendor provisioning to keep coverage current.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
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