UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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Filed by a Party other than the Registrant  ☐
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☐	Preliminary Proxy Statement
☐	CONFIDENTIAL, FOR USE OF THE COMMISSION ONLY (AS PERMITTED BY RULE 14A-6(E)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to Section 240.14a-12

Leslie’s, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Your Vote Counts! LESLIE’S, INC. 2024 Annual Meeting Vote by March 14, 2024 11:59 PM ET LESLIE’S, INC. 2005 E. INDIAN SCHOOL RD. PHOENIX, AZ 85016 V28492-P02563 You invested in LESLIE’S, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on March 15, 2024. Get informed before you vote View the Notice & Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to March 1, 2024. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* March 15, 2024 12:00 PM ET Virtually at: www.virtualshareholdermeeting.com/LESL2024 *Please check the meeting materials for any special requirements for meeting attendance. V1.2

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of Class III Directors Nominees: 01) Susan O’Farrell 02) Claire Spofford 03) Seth Estep For 2. Ratification of appointment of Ernst & Young LLP as Leslie’s, Inc.’s independent registered public accounting firmfor 2024. For 3. Non-binding, advisory vote to approve named executive officer compensation. For 4. Approval of the Leslie’s, Inc. Amended and Restated 2020 Omnibus Incentive Plan. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V28493-P02563