Core Insights - Aon's 2025 Cyber Risk Report indicates that cyber events causing reputation risks can lead to an average 27% decline in shareholder value, emphasizing the financial and reputational stakes of cyber risk [1][3][7] - The report builds on Aon's 2023 findings, which noted a 9% decline in shareholder value from major cyber incidents over the following year, and analyzes over 1,400 global cyber events to identify the most damaging types of attacks [2][3] Cyber Risk Management - Cyber risk is increasingly recognized as a boardroom issue, necessitating proactive risk mitigation strategies to avoid reputational and financial fallout from cyber events [3][4] - The report highlights the challenge of managing uninsurable risks, with reputation risk being largely nontransferable, underscoring the need for effective crisis response [3][5] Key Findings - Of the 1,414 cyber events analyzed, 56 evolved into reputation risk events, which are characterized by significant media attention and measurable declines in share price [7] - Companies facing reputation risk events experienced an average decline of 27% in shareholder value, with malware and ransomware attacks being responsible for 60% of these events despite constituting only 45% of total cyber incidents [7] - Five critical drivers for value recovery were identified: preparedness, leadership, swift action, communication, and change [7]