THYF seeks to provide total return and current income by investing in high-yield debt instruments or junk bonds. The fund primarily holds US-issued or USD-denominated securities, with allocation to non-USD-denominated debt instruments capped at 20%. The high-yield portfolio mainly consists of corporate bonds, although it may include other income-producing instruments such as bank loans, convertibles, and preferred stocks. THYF may hold securities of any maturity or duration, the weighted average maturity or duration of the portfolio is expected to vary depending on market conditions. The fund adviser relies on credit research and analysis to select investments, typically evaluating the bonds income and appreciation potential, as well as the issuers ability to make income and principal payments.