<SEC-DOCUMENT>0001104659-21-122025-index.html : 20211001
<SEC-HEADER>0001104659-21-122025.hdr.sgml : 20211001
<ACCEPTANCE-DATETIME>20211001164135
ACCESSION NUMBER:		0001104659-21-122025
CONFORMED SUBMISSION TYPE:	S-4
PUBLIC DOCUMENT COUNT:		19
FILED AS OF DATE:		20211001
DATE AS OF CHANGE:		20211001

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:		S-4
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-259964
		FILM NUMBER:		211299461

	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>S-4
<SEQUENCE>1
<FILENAME>tm2125387-1_s4.htm
<DESCRIPTION>S-4
<TEXT>
Document 1 - file: tm2125387-1_s4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>tm2125387d2_ex5-1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
Document 2 - file: tm2125387d2_ex5-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>tm2125387d2_ex23-1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
Document 3 - file: tm2125387d2_ex23-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>4
<FILENAME>tm2125387d2_ex23-2.htm
<DESCRIPTION>EXHIBIT 23.2
<TEXT>
Document 4 - file: tm2125387d2_ex23-2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>5
<FILENAME>tm2125387d2_ex99-1.htm
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
Document 5 - file: tm2125387d2_ex99-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>6
<FILENAME>tm2125387d2_ex99-2.htm
<DESCRIPTION>EXHIBIT 99.2
<TEXT>
Document 6 - file: tm2125387d2_ex99-2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.3
<SEQUENCE>7
<FILENAME>tm2125387d2_ex99-3.htm
<DESCRIPTION>EXHIBIT 99.3
<TEXT>
Document 7 - file: tm2125387d2_ex99-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.4
<SEQUENCE>8
<FILENAME>tm2125387d2_ex99-4.htm
<DESCRIPTION>EXHIBIT 99.4
<TEXT>
Document 8 - file: tm2125387d2_ex99-4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.5
<SEQUENCE>9
<FILENAME>tm2125387d2_ex99-5.htm
<DESCRIPTION>EXHIBIT 99.5
<TEXT>
Document 9 - file: tm2125387d2_ex99-5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>image_001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: image_001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>image_002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: image_002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>lg_citinoregister-4c.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: lg_citinoregister-4c.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>lg_crowe-4c.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: lg_crowe-4c.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>lg_crowellpindepen-4c.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: lg_crowellpindepen-4c.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>lg_kbfstifel-4clr.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: lg_kbfstifel-4clr.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>lg_oldsecond-4clr.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 16 - file: lg_oldsecond-4clr.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>lg_westsuburban-pn.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: lg_westsuburban-pn.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>18
<FILENAME>sg_crowellpnew3-bw.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 18 - file: sg_crowellpnew3-bw.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>19
<FILENAME>sg_keefebruwood-bw.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 19 - file: sg_keefebruwood-bw.jpg

</DOCUMENT>
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