SK Shieldus

SK Shieldus Co., Ltd. is South Korea's leading cybersecurity company, offering a comprehensive portfolio of physical security, information security, and convergence security services. Formerly known as ADT Caps Co., Ltd., the company was rebranded as SK Shieldus following its integration into the SK Group ecosystem. Headquartered in Seongnam, South Korea, SK Shieldus serves public institutions, large enterprises, and SMEs — the largest and most diverse client base of any Korean security firm. Its service portfolio spans physical security (guarding, CCTV, access control), cyber threat intelligence, security operations center (SOC) services, managed detection and response (MDR), penetration testing, incident response, and zero-trust/SASE architecture consulting. The company has been recognized as the Customer Value Leader in the cybersecurity services industry and publishes the EQST threat research series, covering ransomware, vulnerability disclosures, and emerging attack techniques. SK Shieldus is a subsidiary of SK Square, the investment arm of SK Group focused on semiconductors and ICT sectors.