Suncor Energy (SU) had the highest return between 1991 and 1993 by a large-cap US stock, returning 6,056.6%.

ASSET	YEARS	% RETURN
Suncor Energy (SU)	1991-1993	6,056.6%
Jack Henry & Associates (JKHY)	1991-1993	2,133.39%
Magna International (MGA)	1991-1993	2,042.56%
Royal Gold (RGLD)	1991-1993	1,854.76%
Johnson Controls International (JCI)	1991-1993	1,600%
Electronic Arts (EA)	1991-1993	1,163.16%
Best Buy (BBY)	1991-1993	1,112.67%
Cisco Systems (CSCO)	1991-1993	1,054.67%
Lam Research (LRCX)	1991-1993	925.39%
PTC (PTC)	1991-1993	811.75%
Oracle (ORCL)	1991-1993	630.3%
Applied Materials (AMAT)	1991-1993	620.83%
UnitedHealth (UNH)	1991-1993	564.45%
Southwest Airlines (LUV)	1991-1993	555.04%
Toll Brothers (TOL)	1991-1993	552.39%
Charles Schwab (SCHW)	1991-1993	549.77%
Constellation Brands Inc Class A (STZ)	1991-1993	503.22%
General Dynamics (GD)	1991-1993	451.67%
Webster Financial (WBS)	1991-1993	425.12%
Teva Pharma Industries Ltd ADR (TEVA)	1991-1993	425.07%
Microchip Technology (MCHP)	1991-1993	424.38%
Lowe's Companies (LOW)	1991-1993	407.18%
Micron Technology (MU)	1991-1993	368.63%
Caseys General Stores (CASY)	1991-1993	357.21%
Aegon NV ADR (AEG)	1991-1993	356.4%

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