They should treat the portfolio as a single access-governance surface, even when legal entities differ. That means consolidating privileged account inventory, enforcing segregation of duties, and tying de-provisioning to ownership change, offboarding, and support expiry. If each company manages access independently, control gaps appear at acquisition and persist through integration.
Why This Matters for Security Teams
Private equity firms often inherit a fragmented access model: each portfolio company keeps its own privileged accounts, approvals, and exceptions, while the firm still expects consistent control over risk. That mismatch creates blind spots during acquisition, integration, exit, and rapid post-close change. NHI Mgmt Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which is exactly why portfolio governance cannot rely on local habits or inherited admin sprawl. The right model treats privileged access as a shared governance surface, not a series of disconnected company-specific problems, and aligns that view with the NIST Cybersecurity Framework 2.0 emphasis on governance, protection, and continuous oversight.
The practical issue is not just who has access today, but who can still access systems after an ownership change, support contract expiry, divestiture, or operating model shift. In practice, many security teams encounter stale privileged access only after an acquisition review, incident, or carve-out has already exposed it.
How It Works in Practice
Effective portfolio-wide privileged access governance starts with a consolidated inventory of privileged identities across all companies, including human admins, service accounts, break-glass accounts, vendor access, and embedded credentials. That inventory should normalize account ownership, business purpose, system scope, and approval authority so the firm can see where access is duplicated or unmanaged. The OWASP Non-Human Identity Top 10 is useful here because many of the same failure modes apply across portfolio companies: hardcoded secrets, excessive privilege, weak rotation, and poor offboarding.
From there, governance should be policy-driven rather than company-by-company discretionary. That usually means:
- defining a common privileged access standard for the holding company and every portfolio company
- requiring segregation of duties for admins, approvers, and auditors
- binding de-provisioning to ownership change, employee offboarding, system retirement, and support expiry
- enforcing time-bound elevation for high-risk access instead of permanent standing access
- reviewing third-party and MSP access separately from internal administrators
For NHI-heavy environments such as CI/CD, integration tooling, and shared platforms, the same control model should extend to service accounts and API keys. NHI Mgmt Group’s Lifecycle Processes for Managing NHIs and 52 NHI Breaches Analysis both reinforce the same operational lesson: access that is not centrally visible is usually not reliably revocable. Current guidance suggests applying a shared review cadence across the portfolio, even when legal entities remain separate, because risk follows privilege paths rather than org charts. These controls tend to break down when post-close integration is delayed and local IT teams keep emergency access in place for “temporary” continuity.
Common Variations and Edge Cases
Tighter portfolio-wide control often increases operating overhead, so firms have to balance speed of integration against the cost of central review, evidence collection, and exception handling. That tradeoff is most visible in carve-outs, partial ownership structures, and transitional service agreements where access must remain live for a defined period. Current guidance suggests documenting those exceptions explicitly, with expiry dates and named owners, instead of treating them as open-ended business necessities.
There is no universal standard for this yet, but best practice is evolving toward one governance baseline with entity-specific implementation details. For example, a newly acquired company may keep its own IAM platform temporarily, while the firm still enforces common rules for privileged account inventory, approval workflow, and quarterly access recertification. The same applies to vendor-admin access, where third-party support should be scoped narrowly and removed as soon as the contract or remediation window ends. NHI Mgmt Group’s Regulatory and Audit Perspectives is a helpful reference when building evidence trails for boards, auditors, and deal teams. For firms prioritizing remediation speed, the Top 10 NHI Issues also highlights why entitlement cleanup must be part of the acquisition playbook, not a later stabilization task.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Portfolio firms often retain stale privileged secrets and accounts. |
| NIST CSF 2.0 | PR.AC-4 | Privileged access should be limited, approved, and continuously reviewed. |
| NIST CSF 2.0 | GV.RM-1 | PE firms need a unified risk view across multiple legal entities. |
Centralize NHI inventory and rotate or revoke privileged access on a fixed, auditable schedule.
Related resources from NHI Mgmt Group
- How should manufacturers govern third-party privileged access?
- What breaks when privileged access reviews are done manually across cloud and SaaS systems?
- How should security teams govern identity fabrics across human, machine, and AI access?
- How should security teams govern non-human identities that have persistent access?
