In terms of fiduciary responsibilities, whose interests must a portfolio manager prioritize?

A portfolio manager has a fiduciary responsibility that primarily focuses on acting in the best interests of the plan beneficiaries. This means that all investment decisions and strategies should be made with the goal of maximizing the financial benefits and security for those individuals or groups who depend on the portfolio for their financial well-being.

Fiduciary duty is grounded in the principles of loyalty and care, requiring the portfolio manager to put the beneficiaries' interests above all others, including their own interests or those of the plan sponsor or regulatory bodies. In doing so, they ensure that they are fulfilling their legal and ethical obligations, which not only protects the beneficiaries but also maintains the integrity of the investment management profession.