PHYAX is a high-yield mutual fund offered by PIMCO Funds. It is designed to provide investors with exposure to a diversified portfolio of high-yield bonds, which are typically issued by companies with lower credit ratings. The fund is managed by PIMCO's experienced team of investment professionals and aims to generate attractive returns while managing risk. As an administrative class fund, PHYAX may have lower fees and expenses compared to other share classes of the same fund. Overall, PHYAX offers investors the potential for higher yields and diversification in their investment portfolio.