Harmony Gold Mining (HMY) had the worst year in 2013 by a large-cap US stock in 2013, returning -71.4%.

ASSET	YEAR	% RETURN
Harmony Gold Mining (HMY)	2013	-71.43%
Gold Fields Ltd ADR (GFI)	2013	-70.1%
AngloGold Ashanti (AU)	2013	-62.74%
Kinross Gold (KGC)	2013	-55.58%
Barrick Gold (GOLD)	2013	-49.8%
Newmont Goldcorp (NEM)	2013	-49.49%
Agnico Eagle Mines (AEM)	2013	-49.43%
Wheaton Precious Metals (WPM)	2013	-44.91%
Royal Gold (RGLD)	2013	-43.47%
Ecopetrol SA ADR (EC)	2013	-33.69%
Alamos Gold (AGI)	2013	-31.76%
Petroleo Brasileiro Petrobras SA ADR (PBR)	2013	-29.61%
Franco-Nevada (FNV)	2013	-28.89%
Edwards Lifesciences (EW)	2013	-28.46%
Teck Resources Ltd Class B (TECK)	2013	-28.23%
Vale SA ADR (VALE)	2013	-26.08%
Southern Copper (SCCO)	2013	-24.67%
Bancolombia SA ADR (CIB)	2013	-24.5%
Intuitive Surgical (ISRG)	2013	-24.17%
Lululemon Athletica (LULU)	2013	-24.06%
Petróleo Brasileiro SA - Petrobras (PBR.A)	2013	-22.5%
Banco Bradesco SA ADR (BBD)	2013	-18.53%
Coca-Cola Femsa SAB de CV ADR (KOF)	2013	-17.67%
FirstEnergy (FE)	2013	-17.47%
Companhia de Saneamento Basico do Estado de Sao Paulo SABESP ADR (SBS)	2013	-16.03%

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