In a portfolio you have a continuous interaction between the portfolio and its components. You have to follow a lot of processes and procedures in order to reach a satisfactory result. In your…

The company's CEO sets organizational strategy at the highest level but does not engage in guiding individual portfolio teams to follow specific processes and metrics.

The Portfolio Management Office provides methodologies, standards, and support functions but does not directly guide individual portfolio teams in day-to-day adherence to processes and metrics.

The Portfolio Sponsor provides executive backing and approvals but does not take an operational role in directing the team to follow specific processes and metrics.

The Portfolio Manager holds direct operational accountability for ensuring the team adheres to defined processes, performance metrics, and governance procedures on a day-to-day basis. This active oversight role is central to the portfolio manager's function and distinguishes their responsibilities from those of sponsors or organizational offices, who provide strategic support and resources rather than process-level guidance.