FirstEnergy (FE) had the highest return between 1996 and 1997 by a large-cap US stock, returning 29,916.4%.

ASSET	YEARS	% RETURN
FirstEnergy (FE)	1996-1997	29,916.42%
Jabil Circuit (JBL)	1996-1997	583.87%
Cooper Companies (COO)	1996-1997	445.03%
Viavi Solutions (VIAV)	1996-1997	362.94%
Heico (HEI)	1996-1997	354.43%
SPX (SPXC)	1996-1997	336.83%
Ross Stores (ROST)	1996-1997	335.39%
AES (AES)	1996-1997	301.08%
Coca-Cola Europacific Partners (CCEP)	1996-1997	299.35%
ASML Holding NV ADR (ASML)	1996-1997	292.73%
TJX Companies (TJX)	1996-1997	275.62%
Dycom Industries (DY)	1996-1997	274.99%
Dollar Tree (DLTR)	1996-1997	268.68%
Banco Bilbao Viscaya Argentaria SA ADR (BBVA)	1996-1997	255.43%
Elbit Systems (ESLT)	1996-1997	250.12%
Johnson Controls International (JCI)	1996-1997	249.53%
Incyte (INCY)	1996-1997	239.62%
US Bancorp (USB)	1996-1997	229.46%
Canadian National Railway (CNI)	1996-1997	227.77%
Expeditors International of Washington (EXPD)	1996-1997	219.1%
Charles Schwab (SCHW)	1996-1997	218.43%
Coca-Cola Femsa SAB de CV ADR (KOF)	1996-1997	213.34%
Raymond James Financial (RJF)	1996-1997	208.82%
Microsoft (MSFT)	1996-1997	194.17%
Costco Wholesale (COST)	1996-1997	192.62%

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