Air T (AIRT) had the lowest return in October 1990 by a US stock, returning -62.4%.

ASSET	MONTH	% RETURN
Air T (AIRT)	October 1990	-62.4%
Unisys (UIS)	October 1990	-55%
Reading International (RDI)	October 1990	-40.81%
Transcontinental Realty Investors (TCI)	October 1990	-40.48%
Weatherford International (WFRD)	October 1990	-40%
ESCO Technologies (ESE)	October 1990	-38.1%
NACCO Industries (NC)	October 1990	-37.33%
G-III Apparel (GIII)	October 1990	-34.78%
JPMorgan Chase (JPM)	October 1990	-34.68%
Fastenal (FAST)	October 1990	-34.38%
Rocky Mountain Chocolate Factory (RMCF)	October 1990	-33.96%
McEwen Mining (MUX)	October 1990	-33.33%
Spectrum Brands (SPB)	October 1990	-33.33%
Cadiz (CDZI)	October 1990	-33.33%
LCI Industries (LCII)	October 1990	-33.32%
Avino Silver & Gold Mines (ASM)	October 1990	-33.29%
Educational Development (EDUC)	October 1990	-33.23%
United-Guardian (UG)	October 1990	-32.65%
Tutor Perini (TPC)	October 1990	-32.63%
Interface (TILE)	October 1990	-32.61%
PrimeEnergy (PNRG)	October 1990	-32.33%
Monster Beverage (MNST)	October 1990	-31.09%
Hecla Mining (HL)	October 1990	-30.86%
PNC Financial Services (PNC)	October 1990	-30.85%
Stewart Information Services (STC)	October 1990	-30.77%