X0306 4 2018-08-08 0 0000105319 WEIGHT WATCHERS INTERNATIONAL INC WTW 0001290183 Semmelbauer Thilo 675 AVENUE OF THE AMERICAS 6TH FLOOR NEW YORK NY 10010 1 0 0 0 Common Stock 2018-08-08 4 S 0 7340 77.47 D 27803 D Common Stock 2018-08-08 4 S 0 3018 78.34 D 24785 D The sales reported in this Form 4 were executed pursuant to a Rule 10b5-1 Sales Plan entered into by the reporting person on May 21, 2018. This transaction was executed in multiple trades at prices ranging from $77.01 to $78.00, inclusive. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide to the Securities Exchange Commission staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4. This transaction was executed in multiple trades at prices ranging from $78.10 to $78.63, inclusive. The price reported above reflects the weighted average sales price. /s/ Stephanie Delavale, as Attorney-In-Fact for Thilo Semmelbauer 2018-08-10