Kinross Gold (KGC) had the lowest return in October 2014 by a large-cap US stock, returning -35.2%.

ASSET	MONTH	% RETURN
Kinross Gold (KGC)	October 2014	-35.24%
AngloGold Ashanti (AU)	October 2014	-30.97%
Agnico Eagle Mines (AEM)	October 2014	-19.66%
Barrick Gold (GOLD)	October 2014	-19.58%
Newmont Goldcorp (NEM)	October 2014	-19.14%
Gold Fields Ltd ADR (GFI)	October 2014	-18.62%
Westlake Chemical (WLK)	October 2014	-18.18%
Baker Hughes (BKR)	October 2014	-18.18%
Sanofi ADR (SNY)	October 2014	-18%
Advanced Micro Devices (AMD)	October 2014	-17.4%
Teck Resources Ltd Class B (TECK)	October 2014	-16.37%
Banco Santander Brasil SA ADR (BSBR)	October 2014	-15.91%
LyondellBasell Industries (LYB)	October 2014	-14.98%
Halliburton (HAL)	October 2014	-14.68%
Equinor ASA ADR (EQNR)	October 2014	-14.56%
Petróleo Brasileiro SA - Petrobras (PBR.A)	October 2014	-14.54%
Texas Pacific Land Trust (TPL)	October 2014	-14.39%
Ecopetrol SA ADR (EC)	October 2014	-14.32%
Petroleo Brasileiro Petrobras SA ADR (PBR)	October 2014	-14.16%
International Business Machines (IBM)	October 2014	-13.43%
Wheaton Precious Metals (WPM)	October 2014	-13.02%
STMicroelectronics NV ADR (STM)	October 2014	-12.5%
Netflix (NFLX)	October 2014	-12.46%
Freeport-McMoran Copper & Gold (FCX)	October 2014	-12.23%
Royal Gold (RGLD)	October 2014	-11.86%

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