SIHY seeks total return from an actively managed portfolio of high-yield corporate debt. The fund holds USD-denominated bonds (including those of foreign issuers) of any maturity. The fund aims to outperform a broader US high-yield benchmark by utilizing a scientifically-driven strategy that uses proprietary quantitative models and insights to produce investment hypothesiswhich is then back-tested using historical data to determine whether actual observations appear consistent with the hypothesis over time. The fund may also invest in derivatives and ETFs to manage portfolio exposures. SIHY is part of Harbors Scientific Alpha suite along with its sibling fundSIFI which, on the other hand, offers a broad global fixed income exposure. Effective February 27, 2023, the Issuer merged the assets from the Harbor High-Yield Bond Fund (HYFAX), roughly $158 million in assets, into SIHY.