X0306 4 2017-02-21 0000795403 WATTS WATER TECHNOLOGIES INC WTS 0001661822 Halloran Virginia A 815 CHESTNUT STREET NORTH ANDOVER MA 01845 1 Chief Accounting Officer Class A Common Stock 2017-02-21 4 F 0 69.0000 63.8500 D 4664.0000 D Represents the number of shares required to be withheld by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs purchased under the Issuer's Management Stock Purchase Plan (MSPP) on February 21, 2014. The Reporting Person previously reported the total number of shares subject to vesting of the RSUs in Table I of a Form 4 filed in connection with the original purchase of the RSUs. The withholding of shares to cover tax withholding obligations is mandated by the terms of the Issuer's MSPP and does not represent a discretionary trade by the Reporting Person. /s/ Amy B. Clark, Attorney-in-Fact 2017-02-22