Cybersecurity diligence is now a value-creation workstream
For private equity firms, cybersecurity diligence cannot end when the purchase agreement closes. Pre-close reviews often identify obvious gaps, but limited access, compressed timelines, and management representations leave unanswered operational questions. The first 100 days are the period to validate assumptions, establish accountability, reduce material exposure, and create a realistic security improvement plan that supports the investment thesis.
That matters because cyber risk can rapidly become an EBITDA, liquidity, and exit-readiness issue. A ransomware event can interrupt production, delay billing, trigger customer notifications, impair an add-on acquisition, or expose weak governance during lender, insurer, or buyer diligence. IBM’s Cost of a Data Breach Report 2024 put the global average breach cost at $4.88 million, while Verizon’s 2024 Data Breach Investigations Report found that credential abuse, exploitation of vulnerabilities, and phishing remain leading routes into organizations.
The goal is not to make every portfolio company look like a regulated enterprise with a large internal security team. It is to determine whether the company can identify, withstand, and recover from credible threats at its size and complexity. The result should be a prioritized operating plan: clear owners, measurable risk reduction, practical technology decisions, and evidence the sponsor can use with boards, insurers, customers, and future buyers.
Start with a risk baseline, not a controls checklist
The first 30 days should establish the company’s actual risk profile. Generic maturity questionnaires are useful for comparison, but they can obscure the exposures that matter to a particular business. A software provider with customer production data, a manufacturer dependent on plant uptime, and a healthcare services company holding protected health information require different priorities.
Begin with a concise risk-baseline workshop involving the CEO, CFO, technology leader, legal counsel, operations, and business-unit owners. Identify crown-jewel systems, critical processes, sensitive data, major revenue dependencies, regulatory obligations, key customers, and the downtime tolerance for each. Map where data enters, moves, is stored, and leaves the organization. Include third-party applications, managed service providers, cloud tenants, remote access paths, payment environments, and acquired entities.
This exercise should also challenge inherited assumptions. Is the company really using multifactor authentication everywhere? Does the backup platform restore a critical application within the stated recovery objective? Are endpoint agents deployed to all corporate and server assets? Does the outsourced IT provider have broad administrative access? Management often believes these controls exist until evidence proves otherwise.
The first 30 days: verify foundational exposure
Initial remediation should focus on conditions that allow attackers to gain and retain access. The CISA Known Exploited Vulnerabilities Catalog is a useful reference point because it prioritizes vulnerabilities with evidence of exploitation rather than theoretical severity. Portfolio companies should have a process to identify affected assets, assign remediation ownership, document exceptions, and confirm completion.
Identity deserves special attention because cloud adoption, remote work, mergers, and outsourced administration have made identity the common control plane. Review the identity provider, tenant administrator roles, MFA enforcement, conditional access, service accounts, break-glass accounts, password policies, and joiner-mover-leaver procedures. Require phishing-resistant MFA for privileged access where feasible. If a company cannot reliably remove former employees, contractors, and vendors, its access governance is not functioning.
Asset visibility is equally important. A vulnerability scanner cannot protect devices it does not know about, and endpoint security cannot investigate systems without a deployed and healthy agent. Reconcile multiple sources: IT asset management, directory services, DHCP, cloud inventories, EDR consoles, virtualization platforms, and procurement records. The output should distinguish managed, unmanaged, unsupported, and business-critical assets. This inventory becomes the backbone for patching, logging, insurance attestations, and incident containment.
Days 31–60: test detection, response, and recovery
Most portfolio companies already own security products. The more important question is whether anyone is operating them. An EDR platform may be licensed but missing servers. A SIEM may ingest logs but have no tuned detections. Email protection may quarantine messages but lack a review process. Firewalls may be configured by an MSP whose changes are not independently reviewed. Technology without monitoring, triage, escalation, and remediation is shelfware with compliance language attached.
Assess whether the company can detect suspicious behavior outside business hours, determine whether an alert is real, contain an affected system, preserve evidence, and communicate with leadership. Review actual alert volumes, open cases, mean time to acknowledge, escalation paths, after-hours coverage, and incident reports from the previous year. Ask for examples of investigations, not a dashboard screenshot. A mature provider can explain why an alert was closed, what evidence supported that decision, and what control improvement followed.
For many middle-market organizations, building a staffed internal 24/7 SOC is not economically rational. The decision is usually between accepting limited coverage, relying on an IT generalist, or adopting Managed SOC Services with defined responsibilities and escalation rules. The right model depends on the company’s attack surface, business hours, regulatory exposure, internal skills, and ability to execute containment actions quickly.
Identity telemetry
Confirm that sign-in, privilege, mailbox, and conditional-access events are retained and reviewed. Identity attacks often provide the earliest signs of account compromise.
Endpoint response
Validate agent coverage, prevention policies, investigation capability, and authority to isolate hosts. Test whether response actions work on servers as well as laptops.
Incident governance
Confirm who declares an incident, contacts counsel and insurers, approves customer notices, and briefs the board when a material event occurs.
An incident response plan should be short enough to use under pressure. It needs current contact details, decision authority, outside counsel, insurance carrier instructions, forensic support, communications guidance, and technical containment steps. Tabletop exercises are valuable when they test a plausible business scenario: ransomware in a distribution center, a compromised finance mailbox before a wire transfer, or an attacker accessing a customer-facing SaaS environment.
Recovery requires more than backups. Validate backup coverage against crown-jewel systems, isolation from production credentials, retention periods, restoration order, and recovery time objectives. Witness a restore test where possible. The National Institute of Standards and Technology’s Cybersecurity Framework 2.0 is useful here because it frames recovery as an organizational capability, including communications and improvement, rather than a storage product feature.
Days 61–100: build the operating model
By day 60, sponsors should move from discovery to execution. The final phase is about making the program durable: assigning ownership, funding the highest-value changes, formalizing reporting, and aligning third parties. A security roadmap should separate urgent remediation from strategic modernization. Combining everything into a single “cyber transformation” project often delays the controls that reduce immediate risk.
Create a 12-month roadmap with a limited number of measurable initiatives. Typical priorities include complete MFA coverage, privileged-access cleanup, EDR deployment, externally exposed asset remediation, backup validation, vulnerability-management cadence, incident-response testing, and centralized monitoring. Each initiative needs an executive owner, technical owner, target date, budget, dependency, and success metric. “Improve security awareness” is not a metric; phishing simulation participation, reported messages, and repeat-risk reduction are closer to useful indicators.
Board reporting should focus on risk decisions, not tool counts. Report the percentage of privileged accounts protected by MFA, critical assets covered by EDR, known exploited vulnerabilities remediated within the target window, successful restore tests, unresolved high-risk findings, and material incidents. Include exceptions and business rationale. This gives the board visibility into whether management is reducing exposure rather than merely consuming a security budget.
Evaluate vendors as operating partners
Third-party risk is especially relevant in portfolio companies that depend on MSPs, software vendors, cloud providers, payment processors, and industry platforms. Review contracts, administrative access, incident notification clauses, service levels, subcontractors, data-processing terms, and termination procedures. For critical vendors, determine whether the company can access logs, export data, rotate credentials, and maintain continuity if the provider fails or is acquired.
The same discipline applies to security providers. A low monthly rate can be attractive, but hidden operating gaps create expensive surprises. Buyers should ask which telemetry is monitored, whether coverage is continuous, how detections are tuned, what actions the provider can take, how incidents are escalated, and what reporting is included. A provider that simply forwards alerts may leave management with the most difficult work at the worst possible time.
Clearnetwork helps organizations operate, monitor, tune, investigate, and respond across security technologies rather than treating controls as isolated products. For companies that need active endpoint coverage, Managed Detection and Response can provide a practical path to continuous investigation and response. Where CrowdStrike is already deployed or planned, Managed CrowdStrike support can help validate coverage, improve alert triage, and connect endpoint activity to a broader response process.
Common first-100-day mistakes
- Buying before validating. Replacing every security tool before establishing asset, identity, and process gaps creates expense without proving risk reduction.
- Confusing compliance with resilience. A completed questionnaire does not demonstrate that management can detect a compromise or restore operations.
- Leaving responsibility with “IT.” Cybersecurity requires business decisions about downtime, customer communication, legal obligations, and risk acceptance.
- Ignoring inherited access. Old administrator accounts, dormant vendors, and shared credentials are frequent post-close liabilities.
- Measuring activity rather than outcomes. Patch counts and training completions matter less than coverage, remediation speed, recoverability, and incident readiness.
Make cyber diligence repeatable across the portfolio
A repeatable playbook helps sponsors compare companies without forcing identical controls on them. Use the same risk categories, evidence requests, scoring logic, and board metrics, then tailor remediation to the company’s sector and operating model. This makes it easier to identify common purchasing opportunities, shared security services, recurring vendor weaknesses, and companies that need more intensive oversight.
The strongest first-100-day programs create momentum without pretending that all risk can be eliminated. They fix exploitable weaknesses, verify recovery, establish detection and response coverage, and give management a practical roadmap. That approach protects value today while producing credible evidence of governance and operational maturity for the next financing, customer review, acquisition, or exit process.
Turn cybersecurity findings into an executable 100-day plan
Clearnetwork can help your portfolio company assess exposure, validate controls, and build managed monitoring and response capabilities that fit the business.
