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.
Additions: Calgon Carbon Corporation (CCC); Evoqua Water Technologies (NYSE: AQUA); and Energy Recovery Inc. (NASDAQ:ERII).
Removal: AquaVenture Holdings (NYSE: WAAS).
Addition: Forterra Inc (NASDAQ:FRTA).
Removal: Energy Recovery, Inc. (NASDAQ:ERII).
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).