X0306 4 2018-03-21 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 2018-03-21 4 F 0 173.0000 79.7000 D 7825.0000 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 restricted stock awards previously granted to the Reporting Person. The withholding of shares to cover tax withholding obligations is mandated by the terms of Reporting Person's restricted stock awards under the Issuer's Second Amended and Restated 2004 Stock Incentive Plan and does not represent a discretionary trade by the Reporting Person. /s/ Amy B. Clark, Attorney-in-Fact 2018-03-22