Jack Henry & Associates (JKHY) had the highest return in October 1990 by a US stock, returning 66.8%.

ASSET	MONTH	% RETURN
Jack Henry & Associates (JKHY)	October 1990	66.76%
Leonardo DRS, Inc Common Stock (DRS)	October 1990	60%
PAMT (PAMT)	October 1990	57.13%
Sono-Tek (SOTK)	October 1990	42.85%
Cooper Companies (COO)	October 1990	38.09%
Citizens (CIA)	October 1990	28.57%
Banco Santander SA ADR (SAN)	October 1990	27.82%
Abeona Therapeutics (ABEO)	October 1990	26.19%
American Shared Hospital Service (AMS)	October 1990	25%
Heartland Express (HTLD)	October 1990	23.88%
NL Industries (NL)	October 1990	22.22%
Southwest Airlines (LUV)	October 1990	21.82%
Cisco Systems (CSCO)	October 1990	21.53%
Repligen (RGEN)	October 1990	20.83%
Cardinal Health (CAH)	October 1990	19.51%
Frank's International (FI)	October 1990	17.89%
Community Bank System (CBU)	October 1990	17.65%
Mitsubishi UFJ Financial Group Inc ADR (MUFG)	October 1990	17.39%
CVB Financial (CVBF)	October 1990	17.34%
Astronics (ATRO)	October 1990	17.01%
Exponent (EXPO)	October 1990	16.39%
Tat Techno (TATT)	October 1990	15.2%
Honda Motor Co Ltd ADR (HMC)	October 1990	14.86%
Bio-Rad Laboratories (BIO)	October 1990	14.85%
Lindsay (LNN)	October 1990	14.55%