NVIDIA (NVDA) had the highest return in March 2001 by a large-cap US stock, returning 47.1%.

ASSET	MONTH	% RETURN
NVIDIA (NVDA)	March 2001	47.09%
United Therapeutics (UTHR)	March 2001	43.82%
Tyler Technologies (TYL)	March 2001	35.71%
Service Corporation International (SCI)	March 2001	35.71%
Advanced Micro Devices (AMD)	March 2001	29.46%
Texas Pacific Land Trust (TPL)	March 2001	25.71%
Take-Two Interactive Software (TTWO)	March 2001	25.41%
Primo Brands (PRMB)	March 2001	24.28%
Apple (AAPL)	March 2001	23.9%
Micron Technology (MU)	March 2001	21.61%
Adobe Systems (ADBE)	March 2001	21.16%
EQT (EQT)	March 2001	19.9%
Lam Research (LRCX)	March 2001	19.87%
KLA-Tencor (KLAC)	March 2001	18.64%
Clean Harbors (CLH)	March 2001	18.19%
PulteGroup (PHM)	March 2001	17.1%
Western Digital (WDC)	March 2001	16.96%
Boston Scientific (BSX)	March 2001	15.31%
Cooper Companies (COO)	March 2001	14.79%
STMicroelectronics NV ADR (STM)	March 2001	14.66%
Southern (SO)	March 2001	13.19%
Republic Services (RSG)	March 2001	12.95%
Fomento Economico Mexicano (FMX)	March 2001	12.87%
Constellation Brands Inc Class A (STZ)	March 2001	12.2%
AutoZone (AZO)	March 2001	12.17%

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