2025 Aon Cyber Risk Report: Reputation Events Slash Shareholder Value by 27%

Aon, a top global professional services firm, has released its highly anticipated 2025 Cyber Risk Report, revealing a stark finding: cyber-related reputation events can trigger an average 27% decline in shareholder value.

The report, a critical barometer for businesses navigating the complex cybersecurity landscape, underscores the escalating financial toll of compromised trust and public perception following a cyber incident.

The complete analysis, drawing on data from thousands of cyber incidents across various industries, highlights that the immediate costs of a breach, such as incident response, recovery, and regulatory fines, are often dwarfed by the long-term impact on a company’s brand and market capitalization.

Reputation damage, stemming from lost customer confidence, diminished investor appeal, and negative media coverage, emerges as a potent and often underestimated factor in post-breach financial performance.

“While companies have made strides in technical defenses, the ‘soft’ costs of cyber-attacks are hardening into significant financial losses,” stated Sarah Jenkins, Head of Cyber Solutions at Aon. “The market is increasingly unforgiving when a company’s integrity is questioned due to a cyber event. Investors are reacting not just to data loss, but to the perceived failure in governance and customer protection.”

The report details how this 27% average reduction in shareholder value can manifest through various channels, including decreased sales due to consumer exodus, difficulty in attracting and retaining talent, and a higher cost of capital as risk premiums increase. It also emphasizes the cascading effect: a single major breach can trigger a chain reaction of negative sentiment that lingers for months, if not years.

Aon urges businesses to shift their focus beyond mere compliance and technical safeguards to a more overall approach that prioritizes cyber resilience and reputation management. This includes robust crisis communication plans, transparent engagement with affected parties, and demonstrable commitment to continuous security improvement.

The 2025 report serves as a compelling call to action for boards and C-suite executives to integrate cyber risk explicitly into their enterprise risk management frameworks, recognizing that a damaged reputation is not merely an abstract concern but a direct threat to shareholder wealth. As the digital economy expands, the nexus between cyber security and market confidence will only strengthen, making reputation a paramount asset to protect.