Cybersecurity for Private Equity Firms: Why Portfolio Companies Are the Biggest Risk — and How to Manage It

This article shows why that needs to change, what specific risks threaten PE portfolios today, and what a pragmatic, scalable approach looks like that delivers real results.

The problem: Portfolio companies are attractive targets

Private equity portfolios typically consist of mid-sized companies. These are exactly the companies that are most interesting to cybercriminals: large enough to justify substantial ransom demands, but often too small to have mature security programs in place.

Making matters worse, the announcement of an acquisition acts as a signal to attackers. Fresh capital in the company means, from a criminal's perspective, a higher willingness to pay in ransomware attacks. The months following a deal are therefore among the riskiest phases in the entire investment lifecycle.

Three reasons why traditional approaches fail

1. Cybersecurity is treated as a checklist

Many PE firms rely on annual assessments or questionnaires that survey the maturity of their portfolio companies. The problem: these snapshots say little about actual resilience. A completed questionnaire is no proof that security measures are practiced in day-to-day operations. ISO certificates and policies sitting in a drawer don't protect against ransomware.

2. Each company is advised individually

The traditional consulting approach — one advisor per portfolio company, individual strategies, separate projects — doesn't scale. With a portfolio of 15 to 30 companies, the costs and coordination efforts are enormous, while results are hardly comparable. Operations teams are overwhelmed, and portfolio company leadership perceives security projects as an additional burden rather than a value driver.

3. Lack of transparency at the portfolio level

Without a unified methodology and comparable KPIs, PE firms lack visibility: Which company has the biggest gaps? Where is immediate action needed? How is cyber maturity developing over time? Without this transparency, informed management is impossible — and critical risks in the portfolio remain undetected.

What leading PE firms do differently

The PE firms that have advanced cybersecurity the furthest don't differ by having bigger budgets — they differ by having a different mindset. They treat cybersecurity not as an IT cost center, but as an investment discipline — comparable to financial reporting or ESG.

Five characteristics stand out:

Cybersecurity starts before the deal. The best firms integrate a thorough cybersecurity due diligence into every investment process. This goes beyond technical vulnerabilities to address the question: Is security structurally embedded in the company — or does it only exist on paper?

Portfolio-wide governance instead of individual projects. Rather than looking at each company in isolation, leading PE firms establish a portfolio-wide program with uniform standards, comparable metrics, and regular reporting.

Measurable progress in short cycles. Long consulting projects with unclear outcomes are replaced by focused programs that deliver concrete, measurable results in just a few weeks.

Empowerment instead of dependency. The best programs strengthen the teams within portfolio companies rather than making them dependent on external consultants. Knowledge transfer and peer learning are central elements.

Communicate cybersecurity as a value driver. Progressive PE firms actively use cyber maturity improvements in ESG reporting and exit negotiations. A demonstrably strengthened security profile increases enterprise value.

The cohort approach: Making cybersecurity scalable

One of the biggest challenges for PE firms is the question: How do I improve cybersecurity across 10, 20, or 30 portfolio companies simultaneously — without costs spiraling and operations teams being tied up for months?

Our answer is cohorts: A group of portfolio companies works together on a focused security topic and achieves measurable progress in eight weeks.

Here's how it works in practice:

Form groups. Portfolio companies are grouped into a cohort and work together on a single topic — for example, attack surface management, incident response readiness, or NIS2 compliance.

Implement together. Over eight weeks, our experts guide participants through a structured process. Weekly meetings, hands-on tasks, and peer exchange ensure that knowledge is not just transferred but actually put into practice.

Measure and report results. The outcome is a concrete report with KPIs, benchmarks, and a roadmap for each participant. The PE firm gains full transparency and comparability across the entire portfolio.

A concrete example: In an attack surface management cohort with 19 mid-sized portfolio companies of a European investor, participants reduced their external attack surface by an average of 68 percent in just eight weeks. This is not a theoretical result from a report — it is a technically verified improvement.

Which topics PE firms should prioritize now

Not every cybersecurity topic has the same urgency. Based on our experience from over 80 cohort engagements and more than 50 due diligence projects, we recommend three focus areas:

Attack surface management

The external attack surface is the first point of contact for attackers — and at the same time the area where the fastest progress is possible. Forgotten subdomains, exposed services, outdated certificates: these risks can be systematically identified and significantly reduced within a few weeks.

Incident response readiness

The question is not if, but when a security incident will occur. What matters is whether the company is prepared. A tested emergency plan, clear responsibilities, and well-rehearsed communication channels can make the difference between a manageable incident and an existential crisis.

NIS2 compliance

The European NIS2 directive significantly raises regulatory requirements for cybersecurity — including for many mid-sized companies that previously didn't consider themselves affected. For PE firms, this means: portfolio companies operating in the supply chain of regulated entities must implement NIS2 requirements. Non-compliance doesn't just endanger business operations — it also threatens enterprise value through damaged customer relationships.

The ROI of cybersecurity in a PE context

Cybersecurity across the portfolio is not just about risk mitigation — it is about value protection and value creation at the same time. The math is straightforward:

Value protection: A successful cyberattack can set a portfolio company back by six to twelve months in its development. Direct costs (forensics, recovery, legal counsel, fines) regularly reach high six-figure sums. On top of that come reputational damage and lost business opportunities.

Value creation: A demonstrably mature security profile is increasingly becoming a differentiator in exit negotiations. Buyers conducting a technical due diligence view a structured security program favorably — while obvious gaps depress the purchase price or delay deals.

Efficiency: The cohort approach saves roughly two-thirds of the cost compared to traditional one-on-one consulting, because it leverages economies of scale and requires significantly less effort from operations teams.

Conclusion: Cybersecurity belongs on every PE firm's agenda

The days when cybersecurity could be delegated as a technical detail to the IT departments of portfolio companies are over. For PE firms, cybersecurity is now a governance topic at the fund level — comparable to financial governance or ESG compliance.

The good news: It doesn't take multi-million-euro programs to achieve substantial progress. With the right approach — focused, scalable, measurable — results that make the entire portfolio more resilient can be achieved in just a few weeks.

int[cube] specializes in cybersecurity for private equity firms. We support investors with cybersecurity due diligence, portfolio-wide cohort programs, and measurable results. Talk to us about how to strengthen the cyber resilience of your portfolio.

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