UK Cyber Litigation Costs Surge to £3.7bn in 2025 Amid Rising Cyber-Attacks

Severity: Low (Score: 33.8)

Sources: Intelligentinsurer, Reinsurancene.Ws, Postonline, Law360

Published: 2026-05-18 · Updated: 2026-05-19

Keywords: litigation, gallagher, cyber-attacks, businesses, total, research, cyber

Severity indicators: ot

Summary

In 2025, cyber-attacks inflicted an estimated £11.7 billion in costs on large UK businesses, with shareholder litigation accounting for £3.7 billion of these losses. Direct costs from lost trading reached £5.4 billion. Gallagher and the Centre for Economics and Business Research provided these figures, indicating a significant rise in legal claims related to cyber incidents. The data highlights the growing financial exposure businesses face due to cyber threats, particularly in shareholder litigation. The trend suggests that as cyber-attacks become more prevalent, the associated legal repercussions are also likely to increase, prompting businesses to reassess their risk management strategies. Key Points: • Cyber-attacks cost UK businesses £11.7 billion in 2025, with £3.7 billion from litigation. • Direct losses from trading disruptions were £5.4 billion, indicating severe operational impacts. • The rise in shareholder litigation reflects increasing financial exposure linked to cyber incidents.

Detailed Analysis

**Impact** In 2025, UK large businesses faced an estimated £11.7 billion in losses due to cyber-attacks. Of this, £5.4 billion resulted from direct costs related to lost trading, while shareholder litigation accounted for £3.7 billion in financial exposure. The affected entities are primarily large UK-based companies experiencing significant operational and financial disruption from cyber incidents. Specific sectors and data types at risk were not detailed in the sources. **Technical Details** The articles do not provide information on attack vectors, tactics, techniques, procedures (TTPs), malware, exploited vulnerabilities, or infrastructure details related to the cyber-attacks. No indicators of compromise (IOCs) or kill chain stages are mentioned. **Recommended Response** No specific mitigation or response actions are provided in the articles. Organizations should monitor for emerging threats related to cyber-attacks causing shareholder litigation and maintain robust incident response and legal risk management practices.

Source articles (4)

UK cyber litigation costs reached £3.7bn in 2025 — Intelligentinsurer · 2026-05-18
Shareholder litigation is emerging as one of the largest financial exposures linked to cyber-attacks for UK businesses with legal claims accounting for £3.7 billion of total losses in 2025. To request…
Cyber attacks drive £3.7bn in shareholder litigation costs for UK businesses, Gallagher ... — Reinsurancene.Ws · 2026-05-18
Cyber attacks generated an estimated £11.7 billion in losses for large UK businesses during 2025, with shareholder litigation making up £3.7 billion of the total cost, according to new research from G…
Cyber-Breaches Cost UK Firms £3.7B In Litigation Fallout — Law360 · 2026-05-19
A Law360 subscription puts you at the center of fast-moving legal issues, trends and developments so you can act with speed and confidence. Over 200 articles are published daily across more than 60 to…
Gallagher warns cyber-related litigation likely to increase — Postonline · 2026-05-18
Cyber-attacks cost large businesses in the UK an estimated £11.7bn in 2025, according to research from Gallagher and the Centre for Economics and Business Research. Out of the £11.7bn total, direct co…

Timeline

2025-01-01 — Cyber-attack costs estimated: Gallagher and the Centre for Economics and Business Research reported total cyber-attack costs for UK businesses at £11.7 billion for 2025.
2025-01-01 — Shareholder litigation costs identified: Out of the total losses, £3.7 billion was attributed to shareholder litigation linked to cyber incidents.
2025-01-01 — Direct trading losses reported: Direct costs from lost trading due to cyber-attacks were estimated at £5.4 billion.