QXO (QXO) had the highest return in March 2004 by a large-cap US stock, returning 550%.

ASSET	MONTH	% RETURN
QXO (QXO)	March 2004	550%
Axon Enterprise (AXON)	March 2004	41.84%
ArcelorMittal SA ADR (MT)	March 2004	28.82%
Mitsubishi UFJ Financial Group Inc ADR (MUFG)	March 2004	27.36%
NVIDIA (NVDA)	March 2004	18.98%
Ambev SA ADR (ABEV)	March 2004	18.36%
Cummins (CMI)	March 2004	18.32%
Take-Two Interactive Software (TTWO)	March 2004	16.94%
Monster Beverage (MNST)	March 2004	16.64%
Halozyme Therapeutics (HALO)	March 2004	16%
Booking (BKNG)	March 2004	15.69%
NRG Energy (NRG)	March 2004	15.63%
FactSet Research Systems (FDS)	March 2004	15.56%
Cooper Companies (COO)	March 2004	14.14%
WESCO International (WCC)	March 2004	13.74%
Rockwell Automation (ROK)	March 2004	13.3%
Littelfuse (LFUS)	March 2004	13.24%
Comfort Systems USA (FIX)	March 2004	12.99%
Nomura Holdings Inc ADR (NMR)	March 2004	12.67%
United Therapeutics (UTHR)	March 2004	12.41%
Apple (AAPL)	March 2004	12.18%
Tyson Foods (TSN)	March 2004	12.11%
Petroleo Brasileiro Petrobras SA ADR (PBR)	March 2004	12.08%
Genesis Healthcare (GEN)	March 2004	11.94%
Orix Corp Ads (IX)	March 2004	11.88%

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