Sociedad Quimica y Minera de Chile SA ADR B (SQM) had the lowest return in March 2015 by a large-cap US stock, returning -29.2%.

ASSET	MONTH	% RETURN
Sociedad Quimica y Minera de Chile SA ADR B (SQM)	March 2015	-29.24%
Vale SA ADR (VALE)	March 2015	-23.44%
Kinross Gold (KGC)	March 2015	-21.4%
Newmont Goldcorp (NEM)	March 2015	-17.67%
Pilgrims Pride (PPC)	March 2015	-17.49%
Super Micro Computer (SMCI)	March 2015	-17.41%
Telefonica Brasil SA ADR (VIV)	March 2015	-17.4%
Veeva Systems Inc Class A (VEEV)	March 2015	-17.3%
AngloGold Ashanti (AU)	March 2015	-17.27%
Barrick Gold (GOLD)	March 2015	-15.95%
Banco Bradesco SA ADR (BBD)	March 2015	-15.26%
Lam Research (LRCX)	March 2015	-15.23%
Seagate Technology (STX)	March 2015	-15%
Western Digital (WDC)	March 2015	-14.82%
Advanced Micro Devices (AMD)	March 2015	-14.38%
TKO (TKO)	March 2015	-14.06%
Teck Resources Ltd Class B (TECK)	March 2015	-13.86%
ArcelorMittal SA ADR (MT)	March 2015	-13.66%
Ovintiv (OVV)	March 2015	-13.35%
Restaurant Brands International (QSR)	March 2015	-13.33%
Agnico Eagle Mines (AEM)	March 2015	-13.09%
Zillow (ZG)	March 2015	-13.08%
Banco Bradesco S/A ADR (BBDO)	March 2015	-13.05%
Rio Tinto ADR (RIO)	March 2015	-12.75%
Micron Technology (MU)	March 2015	-12.71%

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