Hallador Energy (HNRG) had the highest return between 1989 and 1991 by a US stock, returning 1,976.2%.

ASSET	YEARS	% RETURN
Hallador Energy (HNRG)	1989-1991	1,976.19%
UnitedHealth (UNH)	1989-1991	1,559.6%
Mesa Laboratories (MLAB)	1989-1991	1,349.73%
Amgen (AMGN)	1989-1991	1,246.62%
Polaris Industries (PII)	1989-1991	1,174.21%
Vicor (VICR)	1989-1991	1,128.57%
AutoNation (AN)	1989-1991	977.68%
Powell Industries (POWL)	1989-1991	940.02%
Utah Medical Products (UTMD)	1989-1991	814.26%
BioLife Solutions (BLFS)	1989-1991	767.04%
Photronics (PLAB)	1989-1991	725%
Genesis Healthcare (GEN)	1989-1991	709.21%
Nike (NKE)	1989-1991	691.37%
Weatherford International (WFRD)	1989-1991	688.06%
CONMED (CNMD)	1989-1991	677.16%
Costco Wholesale (COST)	1989-1991	671.66%
Stryker (SYK)	1989-1991	641%
Home Depot (HD)	1989-1991	637.39%
Bio-Techne (TECH)	1989-1991	628.45%
Waste Management (WM)	1989-1991	599.72%
Charles Schwab (SCHW)	1989-1991	591.88%
Microsoft (MSFT)	1989-1991	523.71%
Cisco Systems (CSCO)	1989-1991	522.67%
Cracker Barrel Old Country Store (CBRL)	1989-1991	512.7%
National HealthCare (NHC)	1989-1991	493.73%