TAC Infosec Limited, a recently listed IT firm, hit a 5 percent upper circuit to ₹551.5 per share after adding over 500 clients in Q1 FY2025, including prominent names like Autodesk, Salesforce, and Zoominfo. TAC Infosec Limited, founded in 2016, provides risk-based solutions for vulnerability management, cybersecurity assessment, quantification, and penetration testing using a SaaS model.