Additional Proxy Soliciting Materials (Form DEFA14A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

CARLISLE COMPANIES INCORPORATED

(Name of Registrant as Specified in Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

CARLISLE COMPANIES INCORPORATED 16430 NORTH SCOTTSDALE ROAD, SUITE 400 SCOTTSDALE, AZ 85254 ATTN: CHRISTOPHER B. GASKILL Your Vote Counts! 2026 Annual Meeting Vote by April 28, 2026 11:59 PM EDT. For shares held in a Plan, vote by April 26, 2026 11:59 PM EDT. You invested in CARLISLE COMPANIES INCORPORATED 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 materials for the stockholder meeting to be held on April 29, 2026. Get informed before you vote View the Notice of 2026 Annual Meeting of Stockholders, Proxy Statement, 2025 Annual Report and Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 15, 2026. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. 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 in Person at the Meeting* April 29, 2026 8:00 AM local time The St. Regis Longboat Key Resort 1601 Gulf of Mexico Drive Longboat Key, Florida 34228 Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings". V83728-P45433 Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. To elect the two directors nominated by the Board of Directors. Nominees: 1a. Sheryl D. Palmer For 1b. Jesse G. Singh For 2. To approve, on an advisory basis, the Company's named executive officer compensation in 2025. For 3. To ratify the appointment of Deloitte & Touche LLP to serve as the Company's independent registered public accounting firm for 2026. For 4. To transact such other business as may properly come before the meeting or any adjournment or postponement thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings".