<SEC-DOCUMENT>0001057439-18-000011-index.html : 20180212
<SEC-HEADER>0001057439-18-000011.hdr.sgml : 20180212
<ACCEPTANCE-DATETIME>20180212134805
ACCESSION NUMBER:		0001057439-18-000011
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180212
DATE AS OF CHANGE:		20180212

SUBJECT COMPANY:	

	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:			1215

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-33870
		FILM NUMBER:		18595562

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			THOMSON HORSTMANN & BRYANT INC
		CENTRAL INDEX KEY:			0001057439
		IRS NUMBER:				223508647
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		501 MERRITT 7
		CITY:			NORWALK
		STATE:			CT
		ZIP:			06851
		BUSINESS PHONE:		2036537060

	MAIL ADDRESS:	
		STREET 1:		501 MERRITT 7
		CITY:			NORWALK
		STATE:			CT
		ZIP:			06851
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>OSBC.txt
<TEXT>
Document 1 - file: OSBC.txt

</DOCUMENT>
</SEC-DOCUMENT>