Micron Technology (MU) had the highest return between 1993 and 1995 by a mega-cap US stock, returning 954.9%.

ASSET	YEARS	% RETURN
Micron Technology (MU)	1993-1995	954.9%
Applied Materials (AMAT)	1993-1995	363.25%
Oracle (ORCL)	1993-1995	350.02%
Cisco Systems (CSCO)	1993-1995	279.07%
Lam Research (LRCX)	1993-1995	224.89%
Berkshire Hathaway (BRK.A)	1993-1995	173.77%
Citigroup (C)	1993-1995	169.93%
Thermo Fisher Scientific (TMO)	1993-1995	148.24%
UnitedHealth (UNH)	1993-1995	132.89%
Caterpillar (CAT)	1993-1995	118.21%
Raytheon Technologies (RTX)	1993-1995	115.91%
AstraZeneca PLC ADR (AZN)	1993-1995	110.01%
Eli Lilly and (LLY)	1993-1995	109.21%
Microsoft (MSFT)	1993-1995	106.48%
American Express (AXP)	1993-1995	104.91%
McDonald’s (MCD)	1993-1995	88.97%
International Business Machines (IBM)	1993-1995	87.35%
Coca-Cola (KO)	1993-1995	85.93%
Toyota Motor Corporation ADR (TM)	1993-1995	85.17%
GE Aerospace (GE)	1993-1995	83.09%
Johnson & Johnson (JNJ)	1993-1995	82.04%
Shell PLC ADR (SHEL)	1993-1995	80.48%
JPMorgan Chase (JPM)	1993-1995	73.19%
Chevron (CVX)	1993-1995	69.81%
Wells Fargo (WFC)	1993-1995	66.8%

Mega-cap stocks are treated as having a market cap of $200B+.