Cybersecurity diligence for a PE sale: what buyers actually check

Lower-middle-market PE deal velocity picked up measurably across 2024 and 2025, and the cybersecurity diligence bar moved with it. A 2020-vintage diligence memo asked three questions about IT and moved on. A 2026-vintage diligence memo from a credible sponsor asks 40 to 60.

The rough categories a modern buyer works through before a close:

• Documented cybersecurity program
• Tested backup and recovery with evidence
• Cyber insurance in force and renewal posture
• Incident history and unresolved risk
• Vendor-risk inventory
• Regulatory posture relevant to the target’s industry
• Roadmap for identified gaps with dated owners

Getting each of these to a defensible answer before the data room opens is the difference between a clean diligence and a price adjustment or delayed close.

Documented cybersecurity program

The baseline question. A credible program is documented against a framework the operating partner recognizes. In 2026, that is almost always NIST Cybersecurity Framework 2.0 for non-regulated operators, with SOC 2 or NIST 800-171 layered on for technology companies or federal-supply-chain companies.

What a buyer expects to see:

• A written program summary mapped to the framework’s functions
• Evidence each control is operating, not just that a policy exists
• A security officer or vCIO named in writing as the accountable party
• Evidence of an annual review with change tracking

“We have an IT guy who handles security” is not a program. It is a liability line item in the diligence memo.

Tested backup and recovery with evidence

Buyers treat backup evidence as a proxy for operational maturity. A firm that tests restores monthly and documents the result is signaling a broader discipline. A firm that has “nightly backups that are always successful” but cannot produce a restore log is signaling the opposite.

The specific evidence a diligence team wants:

• Immutable offsite backup copies with retention documented
• Monthly or quarterly documented restore tests with timings
• Defined RTO and RPO per system tier
• A runbook the night-shift operator could execute
• Evidence of at least one successful restore in the last 90 days

Untested backups fail diligence. Immutable, tested, documented backups clear the bar.

Cyber insurance in force and renewal posture

The diligence team wants the current policy, the current declarations, the most recent renewal application and the carrier’s response. Three things make this look good:

1. A renewal that landed with flat or reduced premium and no new exclusions
2. A cyber insurance application that reflects real controls rather than aspirational ones
3. No gaps between policy periods

Red flags:

• A renewal that was non-renewed, then placed with a specialty carrier at a higher rate
• Exclusions for ransomware, social engineering or business email compromise
• A history of claim filings with unresolved carrier disputes

Incident history and unresolved risk

Buyers ask directly whether the company has had a cybersecurity incident in the last 3 years. This is not a friendly question. Wrong answers surface later via data-room forensics or the first post-close environment review, and a buyer who feels misled at that stage will repossess value in the working-capital adjustment.

The honest-answer format:

• Every incident reaching the threshold of involving personal or customer data
• Scope, root cause, remediation and current status
• Any regulatory notifications or carrier claims filed
• Open litigation or threatened litigation

A buyer does not penalize a firm for having had an incident. A buyer penalizes a firm for hiding one.

Vendor-risk inventory

The third-party footprint of a modern mid-market firm runs 40 to 120 SaaS and infrastructure vendors. Buyers look for:

• A documented inventory of vendors that touch customer or employee data
• Evidence of due diligence on critical vendors (SOC 2 report review, security questionnaires)
• Contract language covering data protection obligations
• An understanding of which vendors would be a recovery dependency in an incident

A firm with a living vendor inventory and a quarterly review cadence is signaling program maturity. A firm that cannot produce a vendor list in under a week is signaling program absence.

Regulatory posture

Varies by industry. Non-exhaustive examples:

• Manufacturers with federal-contract flow-down: NIST 800-171 posture
• Financial services: SEC or state-examiner cybersecurity expectations, Form ADV Part 2A substantiation
• Healthcare-adjacent vendors: HIPAA Business Associate Agreement compliance
• Payment-card environments: PCI-DSS scope and SAQ accuracy

A buyer expects the target to know which regulatory regimes apply, what the current posture is and where any gaps sit.

Roadmap for identified gaps

No firm passes diligence with zero findings. What matters is whether the findings are acknowledged, owned, dated and resourced.

A credible gap roadmap includes:

• Finding, severity and business impact
• Remediation plan with owner and target date
• Budget line for any material remediation
• A cadence for reporting progress to ownership

A firm with no findings is almost certainly a firm that has not looked hard enough. Buyers know this.

What this looks like at Atticus Rowan

We support a lower-middle-market PE portfolio company we carved out from its publicly-traded industrial-services parent operator, building the standalone IT and cybersecurity environment, operating as the post-close MSP and producing the reporting cadence sponsors expect. That experience directly informs the diligence package we build for firms anticipating sale or recap.

For firms 18 to 24 months from a liquidity event, we usually scope the following arc:

• Months 1 to 3: framework alignment, documentation baseline, gap inventory
• Months 3 to 9: remediation, tested backup, cyber insurance posture improvement, vendor inventory
• Months 9 to 18: evidence accumulation, policy refinement, tabletop cadence
• Months 18 to close: data-room preparation, diligence response readiness, buyer-facing documentation

Starting earlier is always easier than starting later. For a firm already inside a sale process, a compressed 60 to 90 day readiness push is still possible. The outputs are more abbreviated and the remediation is more forward-looking in the buyer package.

If your company is approaching a PE sale, a recapitalization or a strategic acquisition and you want to understand what a modern buyer will expect to see, schedule a discovery call. No pitch. An honest conversation about where you are and what the gap looks like.