The protections I would implement as the Chief Information Security Officer for a publicly traded company would include:

Regular Backup and Disaster Recovery Planning: backup and disaster recovery strategies to protect against data loss and facilitate timely recovery in the event of system failures, data corruption, or other disasters. Monthly drills to ensure the effectiveness of my strategy included.

Network and System Monitoring: continuous network and system monitoring solutions to proactively detect and respond to performance issues, anomalies, or security threats that may affect system availability.