<SEC-DOCUMENT>0001558370-20-003138-index.html : 20200326
<SEC-HEADER>0001558370-20-003138.hdr.sgml : 20200326
<ACCEPTANCE-DATETIME>20200326071421
ACCESSION NUMBER:		0001558370-20-003138
CONFORMED SUBMISSION TYPE:	15-12G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20200326
DATE AS OF CHANGE:		20200326
EFFECTIVENESS DATE:		20200326

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:		15-12G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10537
		FILM NUMBER:		20743983

	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>15-12G
<SEQUENCE>1
<FILENAME>osbc-20200326x15.htm
<TEXT>
Document 1 - file: osbc-20200326x15.htm

</DOCUMENT>
</SEC-DOCUMENT>