SDS IronSphere for z/OS is a continuous security monitoring and compliance tool designed for IBM mainframe environments. It automates the execution of DISA STIG (Security Technical Implementation Guides) scans on z/OS systems, providing real-time visibility into security vulnerabilities and compliance posture. The tool adheres to multiple regulatory and security frameworks including NIST ISCM (Information Security Continuous Monitoring), NIST CSF (Cybersecurity Framework), RMF (Risk Management Framework), FISMA, and GDPR. It was developed by mainframe penetration testers and compliance specialists. Results are presented through a GUI that does not require mainframe expertise to interpret, offering a high-level overview for GRC teams, management, and security personnel, alongside detailed remediation guidance for z/OS technical staff. Scan results are retained within the tool to serve as evidence of continuous monitoring for compliance auditors. IronSphere supports checks beyond those covered by DISA STIGs, including pre-built checks for components lacking official STIGs, as well as the ability to define custom checks tailored to organizational requirements. User roles are configurable, and the tool uses a lean agent on the mainframe that leaves no trace after data collection. The product runs across multiple mainframe operating systems: z/OS, Linux on IBM Z, z/VSE, z/VM, z/TPF, and AS/400. It is positioned for use in government, financial, and insurance sectors, and is designed to reduce reliance on scarce mainframe expertise by automating security assessment and remediation guidance delivery.