X0306 4 2018-05-15 0 0000105319 WEIGHT WATCHERS INTERNATIONAL INC WTW 0001283968 Westend S.A. 44, RUE DE LA VALLEE L-2661 LUXEMBOURG N4 LUXEMBOURG 0 0 1 0 0001053905 Artal Luxembourg S. A. 44, RUE DE LA VALLEE L-2661 LUXEMBOURG N4 LUXEMBOURG 0 0 1 0 0001218180 Artal International S.C.A. 44, RUE DE LA VALLEE L-2661 LUXEMBOURG N4 LUXEMBOURG 0 0 1 0 0001522131 Artal International Management S.A. 44, RUE DE LA VALLEE L-2661 LUXEMBOURG N4 LUXEMBOURG 0 0 1 0 0001053906 Artal Group S.A. 44, RUE DE LA VALLEE L-2661 LUXEMBOURG N4 LUXEMBOURG 0 0 1 0 0001460840 Stichting Administratiekantoor Westend IJSSELBURCHT 3 NL-6825 BS ARNHEM P7 NETHERLANDS 0 0 1 0 0001460839 Minne Pascal 44, RUE DE L'INDUSTRIE 1040 BRUSSELS C9 BELGIUM 0 0 1 0 Common Stock 2018-05-15 4 S 0 8625000 66.24 D 20818300 I See footnotes This amount represents the $69.00 public offering price per share of Common Stock of the Issuer, less the underwriting discount of $2.76 per share. Mr. Pascal Minne is the sole member of the Board of Stichting Administratiekantoor Westend. Stichting Administratiekantoor Westend is the parent of Westend S.A. Westend S.A. is the parent company of Artal Group S.A. Artal Group S.A. is the parent company of Artal International Management S.A., which is the managing partner of Artal International S.C.A. Artal International S.C.A. is the parent company of Artal Luxembourg S.A. Artal Luxembourg S.A. is the record owner of the shares. Each of the Reporting Persons (other than to the extent it directly holds securities reported herein) disclaims beneficial ownership of the securities held by the other Reporting Persons, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), each of the Reporting Persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. WESTEND S.A., By: /s/ Pascal Minne, Name: Pascal Minne, Title: Director 2018-05-17 ARTAL LUXEMBOURG S.A., By: /s/ Anne Goffard, Name: Anne Goffard, Title: Managing Director 2018-05-17 ARTAL INTERNATIONAL S.C.A., By: Artal International Management S.A., as its managing partner, By: /s/ Anne Goffard, Name: Anne Goffard, Title: Managing Director 2018-05-17 ARTAL INTERNATIONAL MANAGEMENT S.A., By: /s/ Anne Goffard, Name: Anne Goffard, Title: Managing Director 2018-05-17 ARTAL GROUP S.A., By: /s/ Anne Goffard, Name: Anne Goffard, Title: Authorized Person 2018-05-17 STICHTING ADMINISTRATIEKANTOOR WESTEND, By: /s/ Pascal Minne, Name: Pascal Minne, Title: Sole Member of the Board 2018-05-17 /s/ Pascal Minne 2018-05-17