Gold Fields Ltd ADR (GFI) had the lowest return in August 2018 by a large-cap US stock, returning -32.5%.

ASSET	MONTH	% RETURN
Gold Fields Ltd ADR (GFI)	August 2018	-32.52%
NetEase (NTES)	August 2018	-22.69%
Insmed (INSM)	August 2018	-19.96%
Alamos Gold (AGI)	August 2018	-19.15%
United States Steel (X)	August 2018	-18.75%
Wheaton Precious Metals (WPM)	August 2018	-17.31%
Agnico Eagle Mines (AEM)	August 2018	-17.26%
Banco Bradesco S/A ADR (BBDO)	August 2018	-16.42%
Flutter Entertainment (FLUT)	August 2018	-16.33%
Kinross Gold (KGC)	August 2018	-15.97%
Newmont Goldcorp (NEM)	August 2018	-14.99%
Banco Bilbao Viscaya Argentaria SA ADR (BBVA)	August 2018	-14.72%
Zillow (ZG)	August 2018	-14.67%
Banco Bradesco SA ADR (BBD)	August 2018	-14.37%
Huazhu (HTHT)	August 2018	-13.73%
Centrais Electricas Brasileiras (EBR)	August 2018	-13.57%
Zillow Group Inc Class C (Z)	August 2018	-13.28%
Snap (SNAP)	August 2018	-13.15%
Deutsche Bank (DB)	August 2018	-13.05%
Electronic Arts (EA)	August 2018	-12.93%
Freeport-McMoran Copper & Gold (FCX)	August 2018	-12.84%
News Corp (NWSA)	August 2018	-12.81%
Franco-Nevada (FNV)	August 2018	-12.53%
Banco Santander Brasil SA ADR (BSBR)	August 2018	-12.49%
Centrais Elétricas Brasileiras SA - Eletrobrás (EBR.B)	August 2018	-12.4%

Large-cap stocks are treated as having a market cap of $10B+.