X0306 4 2020-12-07 0000795403 WATTS WATER TECHNOLOGIES INC WTS 0001235976 HORNE TIMOTHY P 815 CHESTNUT STREET NORTH ANDOVER MA 01845 1 Class A Common Stock 2020-12-07 4 C 0 15000.0000 0 A 15000.0000 I By Trust Class A Common Stock 2020-12-08 4 S 0 15000.0000 116.3100 D 0.0000 I By Trust Class B Common Stock 2020-12-07 4 C 0 15000.0000 0.0000 D Class A Common Stock 15000.0000 5044290.0000 I By Trust Class B Common Stock Class A Common Stock 1050000.0000 1050000.0000 D Shares of Class B Common Stock are convertible into shares of Class A Common Stock on a 1-for-1 basis. The shares are held in a trust for the benefit of Tara V. Horne. The Reporting Person serves as co-trustee of this trust. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.16 to $116.55, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) to this Form 4. All shares of Class B Common Stock were convertible into Class A Common Stock upon issuance and do not have an expiration date. Consists of the following shares of Class B Common Stock which are subject to The Amended and Restated George B. Horne Voting Trust Agreement - 1997 for which the Reporting Person serves as trustee: (i) 1,666,970 shares held in a trust for the benefit of Daniel W. Horne, (ii) 1,666,970 shares held in a trust for the benefit of Deborah Horne, (iii) 1,495,010 shares held in a trust for the benefit of Peter W. Horne, (iv) 22,600 shares held in a trust for the benefit of Tiffany Horne Noonan, (v) 113,924 shares held in a trust for the benefit of Tiffany Horne Noonan, (vi) 20,000 shares held in a trust for the benefit of Tara V. Horne, (vii) 40,000 shares held in a trust for the benefit of Tiffany Horne Noonan, (viii) 6,447 shares held in a trust for the benefit of Kiera R. Noonan, (ix) 6,447 shares held in a trust for the benefit of Tessa R. Noonan, and (x) 5,922 shares held in a trust for the benefit of Liv R. Noonan. /s/ Seth M. Kipp, Attorney-in-Fact 2020-12-08