<SEC-DOCUMENT>0001558370-19-002353-index.html : 20190321
<SEC-HEADER>0001558370-19-002353.hdr.sgml : 20190321
<ACCEPTANCE-DATETIME>20190321171418
ACCESSION NUMBER:		0001558370-19-002353
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20190521
FILED AS OF DATE:		20190321
DATE AS OF CHANGE:		20190321

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:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10537
		FILM NUMBER:		19697744

	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>PRE 14A
<SEQUENCE>1
<FILENAME>pre14a.htm
<DESCRIPTION>PRE 14A
<TEXT>
Document 1 - file: pre14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>coverg001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: coverg001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>pre14ag001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: pre14ag001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>pre14ag002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: pre14ag002.jpg

</DOCUMENT>
</SEC-DOCUMENT>