Washington, D.C. 20549 FORM 10‑K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 001‑11499 WATTS WATER TECHNOLOGIES, INC. (Exact name of registrant as specified in its charter) Delaware 04‑2916536 (State or Other Jurisdiction of (I.R.S. Employer ...