The minimum initial investment required to open an account or purchase shares directly in a PIMCO mutual fund typically varies depending on the specific share class and fund strategy, frequently starting around one million dollars for institutional share classes. However, retail investors can access many popular PIMCO funds through financial intermediaries, brokerage platforms, or specific retail share classes with significantly lower minimums, often ranging from one thousand to five thousand dollars, or through exchange-traded funds with no traditional investment minimum beyond the purchase price of a single share.