Citizens (CIA) had the highest return in October 1987 by a US stock, returning 46.7%.

ASSET	MONTH	% RETURN
Citizens (CIA)	October 1987	46.67%
Comstock Resources (CRK)	October 1987	36.36%
Donegal Group B (DGICB)	October 1987	8.34%
Duke Energy (DUK)	October 1987	4.63%
Weyco (WEYS)	October 1987	2.26%
TXNM Energy (TXNM)	October 1987	2.05%
Intergroup (INTG)	October 1987	2%
Dominion Energy (D)	October 1987	1.2%
CVB Financial (CVBF)	October 1987	0%
American Vanguard (AVD)	October 1987	0%
Central Pacific Financial (CPF)	October 1987	0%
First Financial Bancorp (FFBC)	October 1987	0%
InnSuites Hospitality Trust (IHT)	October 1987	0%
CVD Equipment (CVV)	October 1987	0%
Mount Logan Capital Inc Common Stock (MLCI)	October 1987	0%
Lisata Therapeutics (LSTA)	October 1987	0%
Avient (AVNT)	October 1987	0%
Abeona Therapeutics (ABEO)	October 1987	0%
SUNation Energy (SUNE)	October 1987	0%
McKesson (MCK)	October 1987	0%
Alliant Energy (LNT)	October 1987	-0.17%
WEC Energy (WEC)	October 1987	-0.5%
OGE Energy (OGE)	October 1987	-1.11%
Icahn Enterprises (IEP)	October 1987	-1.58%
American Electric Power (AEP)	October 1987	-1.81%