Summary Prospectus by Investment Company (Form 497K)

MAY 14, 2025

SUPPLEMENT TO:

HARTFORD LONGEVITY ECONOMY ETF SUMMARY PROSPECTUS
DATED JANUARY 28, 2025

This Supplement contains new and additional information and should be read in connection with your Summary Prospectus.

The Board of Trustees of Lattice Strategies Trust (the "Trust") has approved a plan of liquidation for Hartford Longevity Economy ETF ("HLGE") (the "Fund") pursuant to which the Fund will be liquidated on or about June 30, 2025 (the "Liquidation Date"). The Liquidation Date may be changed without notice at the discretion of the officers of the Trust.

Beginning when the Fund commences the liquidation of its portfolio, the Fund may not pursue its investment objective or, with certain exceptions, engage in normal business activities, and the Fund may hold cash and securities that may not be consistent with the Fund's investment objective and strategy, which may adversely affect Fund performance.

Suspension of Sales and Trading. Effective as of the close of business on June 23, 2025, the Fund will no longer accept orders for the purchase of Creation Units. It is expected that June 23, 2025 will be the last full day of trading on NYSE Arca, Inc. ("NYSE Arca") for shares of the Fund. Based on this schedule, NYSE Arca is expected to halt trading in shares of the Fund after the market close on June 23, 2025. During the period between market close on June 23, 2025 and the Liquidation Date, because the Fund's shares will no longer trade on NYSE Arca, there is not expected to be any market for the purchase or sale of the Fund's shares.

Liquidation Process. In connection with the liquidation, any shares of the Fund outstanding on the Liquidation Date will be automatically redeemed as of the close of business on the Liquidation Date without the imposition of customary redemption transaction fees. The proceeds of any such redemption will be equal to the net asset value of such shares after the Fund has paid or provided for all of its charges, taxes, expenses and liabilities, including certain operational costs of liquidating the Fund. The distribution to shareholders of these liquidation proceeds will occur as soon as practicable, and will be made to all Fund shareholders at the time of the liquidation. Additionally, the Fund must declare and distribute to shareholders any realized capital gains and all net investment income no later than the final liquidation distribution. Lattice Strategies LLC, the Fund's investment adviser, intends to distribute substantially all of the Fund's net investment income at the time of, or prior to, the liquidation.

Other Alternatives. Shareholders of the Fund may sell their shares of the Fund on NYSE Arca until the market close on June 23, 2025, and may incur customary transaction fees from their broker-dealer in connection with such sales. Prior to the Liquidation Date, Authorized Participants may continue to submit orders to the Fund for the redemption of Creation Units. See "How to Buy And Sell Shares" section in the Fund's Prospectus.

U.S. Federal Income Tax Matters. For shareholders who hold their Fund shares in taxable accounts, the automatic redemption of shares of the Fund on the Liquidation Date will generally be treated as a sale that may result in a gain or loss for federal income tax purposes. Instead of waiting until the Liquidation Date, a shareholder may voluntarily sell his or her shares on NYSE Arca until the market close on June 23, 2025, and Authorized Participants may voluntarily redeem Creation Units prior to the Liquidation Date, to the extent that a shareholder wishes to realize any such gains or losses prior thereto. See "Fund Distributions and Tax Matters" section in the Fund's Prospectus. Shareholders should consult their tax advisers regarding the tax treatment of the liquidation.

This Supplement should be retained with your Summary Prospectus for future reference.