Dimensional US Sustainability ETF Experiences Unusual Trading Surge The Dimensional US Sustainability Core 1 ETF (NYSEARCA:DFSU) saw its trading volume skyrocket by 156% on Friday, with 239,612 shares exchanged. The stock closed at $37.04, down from its previous $37.52. The ETF, focused on sustainable US equities, has a market capitalization of $1.32 billion and a PE ratio of 24.23.1