Suncor Energy (SU) had the highest return between 1991 and 1994 by a large-cap US stock, returning 6,286.8%.

ASSET	YEARS	% RETURN
Suncor Energy (SU)	1991-1994	6,286.79%
Johnson Controls International (JCI)	1991-1994	3,416.67%
Jack Henry & Associates (JKHY)	1991-1994	1,831.02%
Royal Gold (RGLD)	1991-1994	1,754.88%
Magna International (MGA)	1991-1994	1,616.86%
Best Buy (BBY)	1991-1994	1,529.93%
Cisco Systems (CSCO)	1991-1994	1,155.17%
Lam Research (LRCX)	1991-1994	1,075.39%
Oracle (ORCL)	1991-1994	1,020.86%
Micron Technology (MU)	1991-1994	1,017.54%
Fair Isaac (FICO)	1991-1994	1,015.93%
Microchip Technology (MCHP)	1991-1994	731.98%
PTC (PTC)	1991-1994	711.75%
Electronic Arts (EA)	1991-1994	710.53%
UnitedHealth (UNH)	1991-1994	690.84%
Applied Materials (AMAT)	1991-1994	685.95%
Constellation Brands Inc Class A (STZ)	1991-1994	627.7%
Charles Schwab (SCHW)	1991-1994	606.68%
Aegon NV ADR (AEG)	1991-1994	507.66%
Lowe's Companies (LOW)	1991-1994	495.4%
Caseys General Stores (CASY)	1991-1994	463.36%
KLA-Tencor (KLAC)	1991-1994	444.47%
General Dynamics (GD)	1991-1994	436.91%
Paychex (PAYX)	1991-1994	421.64%
Analog Devices (ADI)	1991-1994	420.34%

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