Enterprise Products Partners (EPD) had the highest return between 1999 and 2003 by a large-cap US stock in the Energy Sector, returning 380.4%.

ASSET	YEARS	% RETURN
Enterprise Products Partners (EPD)	1999-2003	380.45%
Suncor Energy (SU)	1999-2003	261.53%
Cameco (CCJ)	1999-2003	247.56%
EQT (EQT)	1999-2003	233.07%
Cheniere Energy (LNG)	1999-2003	232.39%
Imperial Oil (IMO)	1999-2003	225.06%
Woodside Energy (WDS)	1999-2003	202.07%
Occidental Petroleum (OXY)	1999-2003	201.8%
Plains All American Pipeline (PAA)	1999-2003	186.76%
EOG Resources (EOG)	1999-2003	177.32%
Ovintiv (OVV)	1999-2003	122.31%
Valero Energy (VLO)	1999-2003	118.35%
Enbridge (ENB)	1999-2003	117.78%
Tenaris SA ADR (TS)	1999-2003	111.37%
Contura Energy (CTRA)	1999-2003	101.39%
YPF Sociedad Anonima (YPF)	1999-2003	99.56%
TotalEnergies SE ADR (TTE)	1999-2003	95.98%
Baker Hughes (BKR)	1999-2003	94.04%
Canadian Natural Resources (CNQ)	1999-2003	91.74%
Devon Energy (DVN)	1999-2003	91.25%
TC Energy (TRP)	1999-2003	84.01%
ConocoPhillips (COP)	1999-2003	78.25%
Eni SpA ADR (E)	1999-2003	69.03%
Equinor ASA ADR (EQNR)	1999-2003	64.03%
Petroleo Brasileiro Petrobras SA ADR (PBR)	1999-2003	60.57%

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