Celsius (CELH) had the highest return in March 2014 by a large-cap US stock, returning 97.7%.

ASSET	MONTH	% RETURN
Celsius (CELH)	March 2014	97.7%
AXIA Energia (AXIA)	March 2014	32.1%
AeroVironment (AVAV)	March 2014	29.84%
TKO (TKO)	March 2014	27.29%
ICICI Bank (IBN)	March 2014	25.86%
First Solar (FSLR)	March 2014	25.27%
HDFC Bank Limited ADR (HDB)	March 2014	23.47%
Tower Semiconductor (TSEM)	March 2014	22.03%
MACOM Technology Solutions (MTSI)	March 2014	21.17%
Allegheny Technologies (ATI)	March 2014	20.56%
YPF Sociedad Anonima (YPF)	March 2014	19.85%
Ecopetrol SA ADR (EC)	March 2014	19.2%
Banco Bradesco SA ADR (BBD)	March 2014	18.48%
Petroleo Brasileiro Petrobras SA ADR (PBR)	March 2014	18.47%
Banco Bradesco S/A ADR (BBDO)	March 2014	17.96%
Rambus (RMBS)	March 2014	17.87%
Telefonica Brasil SA ADR (VIV)	March 2014	17.81%
Clean Harbors (CLH)	March 2014	17.07%
Amkor Technology (AMKR)	March 2014	16.27%
Williams-Sonoma (WSM)	March 2014	15.29%
Banco Santander Brasil SA ADR (BSBR)	March 2014	14.14%
Globus Medical (GMED)	March 2014	13.92%
Ovintiv (OVV)	March 2014	13.64%
Western Midstream Partners (WES)	March 2014	13.58%
Cheniere Energy (LNG)	March 2014	13.47%

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