Private equity has always been a model of disciplined value creation. Firms buy undermanaged assets, install professional governance, improve operations, and sell at a premium. For decades, that governance focused on finance, strategy, and talent. Security was an afterthought, reviewed briefly during diligence and then left to the portfolio company's IT director.
That model is changing. A global QBE survey of 300 risk managers and CISO-equivalent roles at private equity firms, conducted between December 2024 and January 2025, found that 95% now require portfolio companies to maintain baseline technical security measures. 96% require consistent governance policies and procedures. 97% require visibility and reporting on cyber incidents.
For UK firms, the shift is particularly pronounced. The mid-market buyout ecosystem is tightly knit, valuations are sensitive, and the regulatory environment is hardening. Cyber risk has moved from the IT budget to the investment thesis.
From Reactive to Institutionalised
Russell Reynolds' November 2025 research on private equity cybersecurity describes two models that are now diverging. Most firms still operate reactively: fragmented accountability, over-reliance on external consultants, limited visibility across the portfolio. A smaller group has moved to an institutionalised model with common reporting formats, standardised metrics, and direct data pipelines from every portfolio company.
The difference is material. One operating partner interviewed by Russell Reynolds oversees forty to fifty companies using standardised dashboards that quantify risk, control adoption, and recovery times. The firm hosts regular CISO forums, publishes playbooks, and embeds cyber in investment theses from acquisition to exit.
The QBE data supports this. 43% of respondents reported that between 51% and 75% of their portfolio companies had made cyber improvements based on the firm's recommendations. Nearly half of firms provide cybersecurity awareness training to their portfolio companies. 46% assist with third-party risk management.
Why 2026 Is Different
Several forces have accelerated the shift toward portfolio-wide security leadership.
Valuation volatility. EY's April 2026 analysis of frontier AI threats notes that autonomous attack agents have collapsed exploit timelines from weeks to hours. For private equity, this reprices cyber risk as a direct driver of valuation volatility, deal certainty, and exit viability. A portfolio company that suffers a breach during the hold period does not just lose operational time. It loses EBITDA, narrative control, and exit optionality.
LP due diligence. Limited partners are asking harder questions about cyber risk across the fund. The RSM US Private Funds CFO Insights Survey 2025, conducted in collaboration with PEI Group, found that 91% of respondents noted LPs are asking very detailed or somewhat detailed questions about cybersecurity during due diligence. 47% said investor questions about cybersecurity have increased in the past twelve months.
Insurance economics. Underwriters are tightening their scrutiny of cyber risk in transactional and portfolio insurance. A March 2026 Foley & Lardner analysis of private company M&A notes that carriers often require an underlying cyber policy for businesses in perceived high-risk environments, and may impose increased retentions or exclusions where known cyber issues exist. The practical effect is that portfolio companies with weak security governance face higher insurance costs or reduced coverage, which flows directly into enterprise value.
UK regulatory pressure. The UK Cyber Security and Resilience Bill is expanding the categories of organisations subject to mandatory security standards. Portfolio companies in regulated sectors, or those supplying regulated sectors, are now facing compliance deadlines that did not exist three years ago. PE firms that wait for portfolio management teams to self-organise are finding themselves behind the curve.
The Economics of a Portfolio Breach
Kroll's February 2026 report, based on a survey of 325 private equity executives globally, puts the average financial impact of a single cyber incident at $2.1 million. 94% of firms reported some form of financial impact from cybersecurity risk. 80% experienced disruption due to cyberattacks during the hold period.
These numbers are not abstract. For a mid-market portfolio company generating £10 million of EBITDA, a multi-million-pound incident cost plus months of operational distraction can erase a material portion of the value creation plan. For a firm with twenty portfolio companies, the probability that at least one will suffer a material incident during the hold period is uncomfortably high.
Kroll also found that 68% of firms report cyber incidents are increasing during the hold period. The most common disruption was unexpected remediation spending, reported by 44% of respondents. 29% faced compliance or regulatory litigation.
What the Mandate Looks Like in Practice
For portfolio company boards and management teams, the new expectations from PE sponsors are becoming clearer.
Security leadership is non-negotiable. The QBE survey found that 95% of firms require baseline technical controls. But the leading firms are going further. They are requiring a named CISO or equivalent security leader with board access, budget authority, and a direct reporting line to the CEO or board. In the mid-market, where portfolio companies often lack dedicated security staff, this frequently means hiring a fractional CISO within the first ninety days of acquisition.
Standardised reporting. Institutionalised firms are implementing common reporting formats across their portfolios. Rather than receiving ad-hoc updates from each company, operating partners review standardised dashboards covering control effectiveness, vulnerability metrics, incident status, and third-party risk. This allows the firm to benchmark maturity, identify outliers, and allocate resources efficiently.
Peer learning. Several leading UK and European firms now host regular CISO roundtables for their portfolio companies. These are not compliance meetings. They are forums for sharing threat intelligence, discussing vendor selection, and comparing incident response experiences. The effect is to raise the floor across the portfolio without bespoke consulting engagements for every company.
Executive accountability. Russell Reynolds notes that some firms are now tying executive compensation to measurable improvements in NIST-aligned maturity scores. This is a significant shift. It signals that cyber is not an IT project but an operational priority with the same weight as revenue growth or cost reduction.
What This Means for Sellers
If you are preparing for an exit, the state of your security function is now a material factor in enterprise value.
Perhaps the weakest position is to have no security leader at all. An acquirer can remediate weak controls. They can patch systems, replace tooling, and tighten policies. What they cannot easily fix is a culture that has not treated security as a board-level responsibility. When a target has no CISO, no security committee, and no incident history because nobody was looking, the acquirer must assume the worst. They price in uncertainty, and that discount can be severe.
Sellers should conduct their own pre-sale cybersecurity assessment at least twelve months before entering the market. This is not a penetration test. It is a full posture review: governance, technical controls, third-party risk, breach history, and regulatory compliance. Findings should be remediated before the data room opens. If you discover a historical breach, disclose it early. Late discovery destroys trust and triggers renegotiation. Early discovery allows you to control the narrative and demonstrate maturity.
You should also expect questions about AI governance. With the EU AI Act now in force and UK regulators watching closely, buyers are asking how targets use automated systems, where training data originates, and whether model governance frameworks exist. This is now part of the cyber due diligence scope.
What This Means for Buyers
For acquirers, the priority is to resource diligence properly. A financial auditor cannot assess whether a Security Operations Centre is understaffed or whether a P2 alert should have auto-escalated to P1. You need a CISO or equivalent security adviser inside the diligence workstream, with direct access to the deal team and the authority to raise red flags.
The diligence brief should go beyond documentation review. Request logs, not policies. Ask for the last three penetration test reports and the remediation status of every critical finding. Review SOC alert response times against SLAs. Map third-party dependencies and concentration risk. Interview the person who actually holds the security budget, not only the CTO who holds the technical mandate.
If the target lacks a security leader, treat that as a finding with a cost attached. You will need to hire one post-close, build a programme, and demonstrate governance to insurers and regulators. That cost belongs in your model.
The Bigger Picture
Private equity has always been good at identifying undermanaged functions and installing professional leadership. For a long time, cybersecurity was the exception. It was treated as a technical specialism, delegated to IT, and reviewed only when something went wrong.
That is no longer the case. The leading UK and European firms have recognised that cyber risk is operational risk, and operational risk is investment risk. They are building security leadership into their operating models with the same discipline they apply to financial control, talent management, and customer strategy.
For portfolio companies, the implication is clear. The firms that thrive under private equity ownership are those that embrace the sponsor's operating playbook. Cybersecurity is now firmly on that playbook. Companies that hire strong security leadership, adopt standardised controls, and report transparently will find themselves with more sponsor support, lower insurance costs, and better exit outcomes. Those that resist will find the mandate enforced from above.
The question for boards and management teams is no longer whether to invest in security leadership. It is how quickly they can get it right.
