The fund dedicates a minimum of 80% of its assets to various forms of debt, including all types of fixed-income instruments. Its investment approach generally involves building a broad and diversified collection of corporate, government, mortgage-backed, and asset-backed securities. A substantial portion, at least 80%, of the fund's holdings must comply with the environmental, social, and governance (ESG) criteria set forth by MacKay Shields LLC, the designated Subadvisor.