Talion

Talion (legal entity SY4 Security Limited) is a UK managed security services provider whose security operations centre in Leeds was created in 2012, when BAE Systems was asked by the UK Government to protect the London Olympics against nation-state threat actors. The SOC was subsequently expanded inside BAE Systems Applied Intelligence to serve government and commercial clients. In April 2020 BAE sold its commercial managed security arm to Keven Knight and Mike Brown, who formed SY4 Security; the business rebranded as Talion Cyber Security in February 2021. Its listed headquarters is in Wakefield, West Yorkshire.

Talion’s services include 24/7 managed detection and response (co-managed or fully managed), hybrid SOC/SOC-as-a-Service, managed EDR and XDR, managed SIEM optimisation on customer platforms such as Splunk, Microsoft Sentinel and Devo, threat intelligence, managed phishing detection and response, vulnerability management, penetration testing and incident readiness and response. In March 2026 it announced Keven Knight as CEO and an expanded ‘Agentic SOC’ that combines automation with human analysts and adds governance and board-reporting touchpoints.

Funding has come from NPIF – Mercia Equity Finance (a seven-figure investment in December 2021, when the company reported over 90 staff and offices in Leeds, Farnborough and Kuala Lumpur), growth finance from Palatine’s Growth Credit Fund in 2025, and a £2m round from existing backers including Mercia and Crown Fund in October 2025 aimed at mid-market growth in the UK and US. In 2026 it won the SME Security Solution award at the Computing Security Excellence Awards.