Aegon NV ADR (AEG) had the highest return between 1989 and 1991 by a US stock, returning 2,538.3%.

ASSET	YEARS	% RETURN
Aegon NV ADR (AEG)	1989-1991	2,538.34%
UnitedHealth (UNH)	1989-1991	1,657.79%
Amgen (AMGN)	1989-1991	1,246.63%
AutoNation (AN)	1989-1991	977.68%
National HealthCare (NHC)	1989-1991	948.97%
Vicor (VICR)	1989-1991	805.28%
Powell Industries (POWL)	1989-1991	804.32%
Utah Medical Products (UTMD)	1989-1991	803.27%
BioLife Solutions (BLFS)	1989-1991	756.72%
Laboratory Corporation of America (LH)	1989-1991	737.1%
Photronics (PLAB)	1989-1991	725%
Nike (NKE)	1989-1991	683.75%
Genesis Healthcare (GEN)	1989-1991	673.97%
Stryker (SYK)	1989-1991	659.71%
CONMED (CNMD)	1989-1991	655.53%
Mesa Laboratories (MLAB)	1989-1991	649.97%
Home Depot (HD)	1989-1991	634.72%
Bio-Techne (TECH)	1989-1991	610.11%
Waste Management (WM)	1989-1991	599.72%
Charles Schwab (SCHW)	1989-1991	587.08%
Microsoft (MSFT)	1989-1991	523.74%
Cracker Barrel Old Country Store (CBRL)	1989-1991	512.68%
Cisco Systems (CSCO)	1989-1991	495.51%
International Game Technology (IGT)	1989-1991	493.53%
Shyft (SHYF)	1989-1991	477.73%