Fidelity Merrimack Street Trust has filed a summary prospectus for its Fidelity Systematic Municipal Bond Index ETF, effective October 30, 2026. This filing is significant as it outlines the fund's investment objectives, strategies, and associated risks, reflecting Fidelity's commitment to offering tax-exempt investment options in the municipal bond market.

The Fidelity Systematic Municipal Bond Index ETF seeks to provide a high current yield exempt from federal income tax. The fund aims to invest at least 80% of its assets in municipal securities, which are often seen as a stable investment choice for those looking to minimize tax liabilities.

Fidelity Merrimack Street Trust is an investment entity incorporated in Massachusetts. It operates under the Central Index Key (CIK) number 0001562565. The firm has been active in the investment sector, filing multiple forms, including the recent 497K submissions on October 29, 2026, which include the current prospectus.

The filing states, "Before you invest, you may want to review the fund's prospectus, which contains more information about the fund and its risks." This emphasizes the importance of understanding the potential risks involved in investing in municipal bonds, particularly in the current economic climate.

This update may affect investors looking for tax-efficient investment options, as well as competitors in the investment sector who may need to adapt their offerings in response to Fidelity's new ETF. The municipal bond market has seen increased interest as investors seek stable returns amid economic uncertainty.

Details regarding the next steps were not available in the SEC filing. However, the prospectus indicates that investors can access further information about the fund through Fidelity's website or by contacting their customer service.