Intuitive Surgical (ISRG) had the highest return in March 2003 by a large-cap US stock, returning 72.3%.

ASSET	MONTH	% RETURN
Intuitive Surgical (ISRG)	March 2003	72.26%
MasTec (MTZ)	March 2003	40.63%
Align Technology (ALGN)	March 2003	30.11%
Insmed (INSM)	March 2003	28.57%
U-Haul (UHAL)	March 2003	27.85%
FactSet Research Systems (FDS)	March 2003	26.02%
MicroStrategy (MSTR)	March 2003	25.44%
Booking (BKNG)	March 2003	25.19%
Itau Unibanco Banco (ITUB)	March 2003	24.3%
NetEase (NTES)	March 2003	23.03%
Gilead Sciences (GILD)	March 2003	22.78%
Corning (GLW)	March 2003	21.66%
CenterPoint Energy (CNP)	March 2003	21.39%
Banco Bradesco SA ADR (BBD)	March 2003	20.66%
CRH PLC ADR (CRH)	March 2003	20.42%
YPF Sociedad Anonima (YPF)	March 2003	20.38%
Netflix (NFLX)	March 2003	20.35%
Fresenius Medical Care (FMS)	March 2003	20.3%
Petroleo Brasileiro Petrobras SA ADR (PBR)	March 2003	20.11%
Petróleo Brasileiro SA - Petrobras (PBR.A)	March 2003	19.95%
Biogen (BIIB)	March 2003	19.69%
Ambev SA ADR (ABEV)	March 2003	19.31%
Williams Companies (WMB)	March 2003	19.29%
Southwest Airlines (LUV)	March 2003	18.14%
Amazon (AMZN)	March 2003	17.52%

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