PIMCO ETF Trust – PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund is an actively managed, exchange-traded fixed-income fund that seeks to provide investors with core, high-quality, intermediate-term exposure to the U.S. mortgage-backed securities market and risk-adjusted return potential. The Fund invests principally in mortgage-backed securities, including agency mortgage pass-through securities and other mortgage-related instruments issued or guaranteed by U.S. government-sponsored enterprises and agencies, such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association; it may also use to-be-announced mortgage contracts, repurchase agreements, derivatives, cash instruments and other fixed-income securities in support of portfolio management, liquidity and risk-management activities. Its investment strategy emphasizes fundamental security selection, relative-value analysis, sector allocation, coupon and maturity positioning, mortgage-prepayment assessment, duration management and active portfolio weighting. The Fund is designed for individual and institutional investors seeking actively managed exposure to investment-grade mortgage-backed securities through shares traded on The Nasdaq Stock Market under the ticker PMBS. PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund was launched in September 2024 and is organized as a series of PIMCO ETF Trust, a U.S.-registered investment company. Pacific Investment Management Company LLC serves as investment adviser, PIMCO Investments LLC serves as distributor, and State Street Bank and Trust Company provides administrative, custodial and transfer-agency services. The Fund is managed from PIMCO’s U.S. operations, whose principal headquarters are in Newport Beach, California, and primarily targets the U.S. fixed-income market. Recent major developments include the Fund’s September 2024 launch as a dedicated actively managed mortgage-backed securities ETF, expanding PIMCO’s active fixed-income ETF product range; continued asset growth and portfolio expansion following launch, with reported net assets of approximately $1.38 billion to $1.40 billion during 2026; and ongoing active management of a broad mortgage-backed securities portfolio comprising more than 1,300 holdings, including securities tied to Fannie Mae, Freddie Mac and Ginnie Mae.