FIW is trading 3.54% up at $108.83 after closing September 18, 2026, at $105.14; no verified company-specific announcement, earnings release, or late-breaking catalyst was found to explain the after-hours jump.
- FIW is the First Trust Water ETF, diversified across 36 holdings, including Waters, Agilent, Roper Technologies, and American Water Works.
- The broader market was mixed: Nasdaq up 0.80% and Dow down 0.14%, so market sentiment alone does not clearly explain FIW’s move.