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 x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material under §240.14a-12

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):

x No fee required.

¨ Fee paid previously with preliminary materials.

¨ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11.

Your Vote Counts! CARLISLE COMPANIES INCORPORATED 2022 Annual Meeting Vote by May 3, 2022 11:59 PM EDT. For shares held in a Plan, vote by April 29, 2022 11:59 PM EDT. CARLISLE COMPANIES INCORPORATED 16430 NORTH SCOTTSDALE ROAD, SUITE 400 SCOTTSDALE, AZ 85254 ATTN: SCOTT C. SELBACH D65549-P66397 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 material for the stockholder meeting to be held on May 4, 2022. Get informed before you vote View the Notice of 2022 Annual Meeting of Stockholders, Proxy Statement, 2021 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 20, 2022. 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 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 # Vote in Person at the Meeting* May 4, 2022 8:00 AM local time Smartphone users Point your camera here and vote without entering a control number Four Seasons Resort and Club Dallas at Las Colinas 4150 North MacArthur Boulevard Irving, Texas 75038 *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. V1

Vote at www.ProxyVote.com 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. Board Recommends Voting Items 1. To elect the three directors nominated by the Board of Directors. Nominees: 1a. Robin J. Adams For 1b. Jonathan R. Collins For 1c. D. Christian Koch For 2. To adopt an amendment to the Company’s Restated Certificate of Incorporation to eliminate enhanced voting rights for holders of shares of the Company’s common stock that satisfy certain criteria and provide for one vote for each outstanding share. For 3. To ratify the appointment of Deloitte & Touche LLP to serve as the Company’s independent registered public accounting firm for 2022. For 4. To approve an amendment and restatement of the Company’s Incentive Compensation Program to increase the number of shares of the Company’s common stock available for issuance thereunder. For 5. To approve, on an advisory basis, the Company’s named executive officer compensation in 2021. For 6. To transact any other business properly brought 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 “Sign up for E-delivery”. D65550-P66397