WATTS WATER TECHNOLOGIES, INC. C/O BROADRIDGE FINANCIAL SOLUTIONS, INC. P.O. BOX 1342 BRENTWOOD, NY 11717 Your Vote Counts! WATTS WATER TECHNOLOGIES, INC. 2024 Annual Meeting Vote by May 21, 2024 11 :59 PM ET You invested in WATTS WATER TECHNOLOGIES, 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 stockholder meeting to be held on May 22, 2024. Get informed before you vote View the Notice & Proxy Statement, 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 May 08, 2024. 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. Smartphone users Point your camera here and vote without entering a ~I number Vote in Person at the Meeting* May 22, 2024 9:00 AM EDT Watts Water Technologies, Inc. 81 5 Chestnut Street North Andover, MA 01845 *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 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. Voting Items 1. Election of Directors Nominees: 01) Rebecca J. Boll 02) Michael J. Dubose 03) David A. Dunbar 04) Louise K. Goeser 05) Kenneth Napolitano 06) Joseph T. Noonan 2. Advisory vote to approve named executive officer compensation. 07) Robert J. Pagano, Jr. 08) Merilee Raines 09) Joseph W. Reitmeier 3. To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024. Board Recommends 0 For 0 For 0 For NOTE: The proxies, in their discretion, are authorized to vote upon such other matters 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 "Sign up for E-delivery".

¨		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 Pursuant to §240.14a-12

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.