John is a portfolio manager at Delta Investments. He has recently been offered a lucrative speaking engagement at an investment conference, which is sponsored by a company whose stock he holds in his portfolio. The company has approached him directly to encourage his participation. While John finds the opportunity appealing, he is also aware that his support for the company's stock during the conference could be perceived as a conflict of interest.
As John prepares for his presentation, he reflects on the CFA Institute's Code of Ethics and Standards of Professional Conduct. He wants to ensure that his actions align with professional standards, especially concerning conflicts of interest. He is considering various options for how to handle this situation.
What should John do to adhere to the ethical guidelines related to conflicts of interest?