Back to top

ISE Clean Edge Water Index (HHO) Semi-Annual Updates

HHO Index Logo

Clean Edge semi-annually re-evaluates and updates the stocks included in the ISE Clean Edge Water Index (HHO). Here is a list of historical changes with most recent first.

March 2024

Additions: Hawkins, Inc. (Nasdaq: HWKN), Montrose Environmental Group, Inc. (New York: MEG), and Veralto Corp. (New York: VLTO)

Deletions: Danaher Corp. (New York: DHR), Energy Recovery, Inc. (Nasdaq: ERII), and Middlesex Water Co. (Nasdaq: MSEX)

September 2023

Additions: Ferguson Plc (New York: FERG) and Waters Corp. (New York: WAT)

Deletions: Hawkins, Inc. (NASDAQ: HWKN) and Montrose Environmental Group, Inc. (New York: MEG)

March 2023

Additions: Hawkins, Inc. (NASDAQ: HWKN) 

Deletions: Evoqua Water Technologies Corp. (New York: AQUA)

September 2022

There were no additions or removals from the HHO Index as a result of the September 2022 evaluation.

March 2022

Additions: HHO Index: Core & Main, Inc. (NYSE: CNM)

Deletions: The Gorman-Rupp Co. (NYSE: GRC)

September 2021

Additions: Stantec, Inc. (NYSE: STN)

Deletions: York Water Co. (NASDAQ: YORW)

March 2021

Additions: Energy Recovery Inc (NASDAQ: ERII) and Montrose Environmental Group (NYSE: MEG)

Deletions: Aegion Corp (NASDAQ: AEGN) and Forterra, Inc. (NASDAQ: FRTA)

September 2020

Additions: Primo Water Corp (NYSE: PRMW)

Deletions: Energy Recovery Inc. (NASDAQ: ERII)

April 2020

Additions: Algonquin Power & Utilities Corp (NYSE: AQN) and Forterra (NASDAQ: FRTA)

Deletions: Aquaventure Holdings (NYSE: WAAS) and Primo Water (NASDAQ: PRMW) 

March 2019

Addition: Primo (NASDAQ: PRMW).

Removal: Forterra, Inc (NASDAQ: FRTA).

September 2018

Addition: AquaVenture Holdings Limited (NYSE: WAAS).

Removal: Connecticut Water Service, Inc. (NASDAQ: CTWS).

March 2018

Additions: Calgon Carbon Corporation (CCC); Evoqua Water Technologies (NYSE: AQUA); and Energy Recovery Inc. (NASDAQ :ERII).

Removal: AquaVenture Holdings (NYSE: WAAS).

September 2017

Addition: Forterra Inc (NASDAQ:FRTA).

Removal: Energy Recovery, Inc. (NASDAQ:ERII).

June 2017

Additions: A. O. Smith Corporation (AOS); Aqua Venture Holdings Limited (WAAS); Connecticut Water Service, Inc. (CTWS); Middlesex Water Company (MSEX); and York Water Company (YOWR).

Removals: Ashland Global Holdings Inc. (ASH); Cadiz Inc. (CDZI); Crane Company (CR); Layne Christensen Company (LAYN); and PICO Holdings, Inc. (PICO).