X0206 3 2019-12-23 0 0001422841 AquaVenture Holdings Ltd WAAS 0001034196 ADVENT INTERNATIONAL CORP/MA 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001676961 Advent Partners GPE VIII-A Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001677005 Advent Partners GPE VIII-B Cayman Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001676968 Advent Partners GPE VIII Cayman Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001676941 Advent Partners GPE VIII Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001664594 Advent International GPE VIII-A Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001664585 Advent International GPE VIII-E Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001664583 Advent International GPE VIII-G Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001665371 Advent International GPE VIII-K Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 0001665977 Advent International GPE VIII-L Limited Partnership 800 BOYLSTON STREET BOSTON MA 02199 0 0 1 0 No securities are beneficially owned 0 D Each of the Reporting Persons may be deemed to have become a 10% Owner of the Issuer in connection with the entry into of certain Voting Agreements dated December 23, 2019 (the "Voting Agreements"), by and between Culligan International Company, on the one hand, and each of Douglas Brown and Element Partners (each, a "Stockholder"), representing an aggregate of 11,269,2014 shares of Issuers ordinary shares beneficially owned by the Stockholders. The Voting Agreements were entered into in connection with the Agreement and Plan of Merger dated December 23, 2019, by and among Culligan International Company, Amberjack Merger Sub Limited and the Issuer. The Reporting Persons exercise voting power in limited situations over such shares of the Issuer's ordinary shares through the grant of an irrevocable proxy by each of the Stockholders in the Voting Agreements. The Reporting Persons have no pecuniary interest in any of such shares of Issuer's common stock. Exhibit 99.1 (Joint Filer Information) is incorporated herein by reference. This Form 3 is the first of two Forms 3 being filed relating to the same event. The Form 3 has been split into two filings because there are more than 10 Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 3 to a maximum of 10 Reporting Persons. ADVENT INTERNATIONAL CORPORATION /s/ James Westra Name: James Westra Title: General Counsel and Managing Partner 2020-01-02