    <SEC-DOCUMENT>0001104659-23-045534-index.html : 20230414
    <SEC-HEADER>0001104659-23-045534.hdr.sgml : 20230414
    <ACCEPTANCE-DATETIME>20230414152938
    ACCESSION NUMBER:		0001104659-23-045534
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20221231
    FILED AS OF DATE:		20230414
    DATE AS OF CHANGE:		20230414
    EFFECTIVENESS DATE:		20230414

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			OLD SECOND BANCORP INC
    		CENTRAL INDEX KEY:			0000357173
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				363143493
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-10537
    		FILM NUMBER:		23820937

    	BUSINESS ADDRESS:
    		STREET 1:		37 S RIVER ST
    		CITY:			AURORA
    		STATE:			IL
    		ZIP:			60507
    		BUSINESS PHONE:		6308920202

    	MAIL ADDRESS:
    		STREET 1:		37 SOUTH RIVER STREET
    		CITY:			AURORA
    		STATE:			IL
    		ZIP:			60507
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>tm237118d1_ars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: tm237118d1_ars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>