Prospectus by Investment Company - Form 497

Important Notice Regarding Change

in Benchmark Index

SPDR^® Series Trust

SPDR Dow Jones^® REIT ETF

(the "Fund")

Supplement dated August 20, 2024 to the Prospectus and Summary Prospectus,

each dated October 31, 2023, as may be supplemented from time to time

Effective September 20, 2024 (the "Effective Date"), the Fund's benchmark index will change. Please note the differences between the Old Benchmark Index and the New Benchmark Index are limited to a capping to the weighting of market capitalization of individual REITs, and the aggregate of all REITs in the Index as described in Section 2 below.

Accordingly, as of the Effective Date:

The Index is designed to provide a measure of real estate securities that serve as proxies for direct real estate investing, in part by excluding securities whose value is not always closely tied to the value of the underlying real estate. The reason for the exclusions is that performance of such securities may be driven by factors other than the value of real estate. The Index is a market capitalization weighted index of publicly traded real estate investment trusts ("REITs") and is comprised of companies whose charters are the equity ownership and operation of commercial and/or residential real estate and which operate under the REIT Act of 1960. To be included in the Index, a company must be both an equity owner and operator of commercial and/or residential real estate. Businesses excluded from the Index include: those classified under the Dow Jones REIT/RESI Industry Classification Hierarchy and/or Global Industry Classification Standard (GICS) as "Specialty" (i.e., REIT types that cannot be easily classified within the Hierarchy, including timber REITs, railroad REITs and tower REITs), hybrid REITS, mortgage REITs, real estate finance companies, mortgage brokers and bankers, commercial and residential real estate brokers and estate agents, home builders, large landowners and subdividers of unimproved land, as well as companies that have more than 25% of their assets in direct mortgage investments. A company must have a minimum float-adjusted market capitalization of at least $200 million at the time of its inclusion, and at least 75% of the company's total revenue must be derived from the ownership and operation of real estate assets. A stock must have a median daily value traded of at least $5 million for the three-months prior to the rebalancing reference date. The Index is generally rebalanced quarterly, and returns are calculated on a buy and hold basis except as necessary to reflect the occasional occurrence of

Index changes in the middle of the month. Each REIT in the Index is weighted by its float-adjusted market capitalization (i.e., each security is weighted to reflect the attainable market capitalization of the security which reflects that portion of securities shares that are accessible to investors), subject to the following constraints applied at each rebalancing: (i) no single company's weight can exceed 10%, and (ii) the aggregate weight of all companies weighing above 4.5% cannot exceed 22.5%. In addition, each company's weight in the Index is reviewed daily and when the sum of companies with a weight greater than 5% exceeds 25%, additional capping is performed, effective after the close of business on the next trading day. The Index is priced daily and is a total return (price and income) benchmark. As of July 31, 2024, the Index comprised 102 REITs.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

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