374Water Inc Common Stock (SCWO) had the highest return between 1990 and 1997 by a US stock, returning 459,734.9%.

ASSET	YEARS	% RETURN
374Water Inc Common Stock (SCWO)	1990-1997	459,734.86%
Universal Insurance (UVE)	1990-1997	324,500%
Johnson Controls International (JCI)	1990-1997	88,225%
Heritage Global (HGBL)	1990-1997	15,564.96%
Jack Henry & Associates (JKHY)	1990-1997	12,823.76%
Cisco Systems (CSCO)	1990-1997	12,505.03%
Suncor Energy (SU)	1990-1997	10,137.73%
Aegon NV ADR (AEG)	1990-1997	7,262.34%
Argan (AGX)	1990-1997	5,201.08%
Riley Exploration Permian (REPX)	1990-1997	5,199.88%
National HealthCare (NHC)	1990-1997	3,876.63%
Charles Schwab (SCHW)	1990-1997	3,132.39%
Firefly Neuroscience (AIFF)	1990-1997	2,864.7%
PTC (PTC)	1990-1997	2,607.15%
Microsoft (MSFT)	1990-1997	2,521.59%
GEE (JOB)	1990-1997	2,391.43%
Bio-Techne (TECH)	1990-1997	2,334.58%
Alto Ingredients (ALTO)	1990-1997	2,280.95%
Waste Management (WM)	1990-1997	2,225.86%
DXP Enterprises (DXPE)	1990-1997	2,200%
Idaho Strategic Resources (IDR)	1990-1997	2,087.5%
Great Southern Bancorp (GSBC)	1990-1997	2,002.03%
Paychex (PAYX)	1990-1997	1,997.63%
Semtech (SMTC)	1990-1997	1,986.43%
Viavi Solutions (VIAV)	1990-1997	1,906.07%