Who are Old Second Bancorp, Inc.'s main suppliers?

Old Second Bancorp, Inc. (OSBC) key suppliers include: BANCORP-FINANCIAL-INC, Federal Home Loan Mortgage Corporation, Federal Home Loan Mortgage Corporation, Federal National Mortgage Association, Federal National Mortgage Association and 2 more. View the full supplier network at chainsifter.com/chain/OSBC.

Who are Old Second Bancorp, Inc.'s major customers?

Old Second Bancorp, Inc. (OSBC) key customers include: Federal Home Loan Mortgage Corporation, Federal Home Loan Mortgage Corporation, Federal National Mortgage Association, Federal National Mortgage Association, FREJP and 3 more. View the full customer network at chainsifter.com/chain/OSBC.

What sector is Old Second Bancorp, Inc. in?

Old Second Bancorp, Inc. (OSBC) operates in the general sector. ChainSifter tracks its verified supply chain relationships including suppliers, customers, and strategic partners.

Old Second Bancorp, Inc. Supplier List (OSBC): 7 Verified Suppliers

7Suppliers

8Customers

3Debt Items

20Related Chains

Source-Backed Evidence Depth

Old Second Bancorp, Inc. (OSBC) is shown with relationship data already present in ChainSifter's database. Counts below come from stored supply-chain records and filing/source URLs where available; missing source URLs are not filled in or estimated.

19Total relationships

2Distinct source URLs

5High confidence

0.758Average confidence

2026-09-13Latest database update

ChainSifter does not infer unreported suppliers, customers, ownership, acquisitions, debt exposure, revenue dependency, or future supply-chain events on this public page.

Old Second Bancorp, Inc. Suppliers

Ticker	Name	Confidence	Evidence
BANCORP-FINANCIAL-INC	BANCORP-FINANCIAL-INC	92%	On July 1, 2025, we completed our previously announced acquisition of Bancorp Financial, Inc. ("Bancorp Financial"), pursuant to the agreement and plan of merger dated February 24, 2025.
FMCKI	Federal Home Loan Mortgage Corporation	72%	the transaction on a timely basis or at all; ● the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the merger agree…
FMCKI	Federal Home Loan Mortgage Corporation	72%	Reciprocal relationship from FMCKI graph: Reciprocal relationship from OSBC graph: Reciprocal relationship from FMCKI graph: Reciprocal relationship from OSBC graph: the transaction on a timely basis…
FNMAS	Federal National Mortgage Association	72%	the transaction on a timely basis or at all; ● the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the merger agree…
FNMAS	Federal National Mortgage Association	72%	Reciprocal relationship from FNMAS graph: Reciprocal relationship from OSBC graph: the transaction on a timely basis or at all; ● the occurrence of any event, change or other circumstances that could…
FREJP	FREJP	72%	the transaction on a timely basis or at all; ● the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the merger agree…
FREJP	FREJP	72%	Reciprocal relationship from FREJP graph: Reciprocal relationship from OSBC graph: Reciprocal relationship from FREJP graph: Reciprocal relationship from OSBC graph: the transaction on a timely basis…

Old Second Bancorp, Inc. Customers

Ticker	Name	Confidence	Evidence
FMCKI	Federal Home Loan Mortgage Corporation	72%	We are located in an area where a large amount of development activity has occurred as rural and semi-rural areas are being suburbanized. This type of growth presents some economic risks should local…
FMCKI	Federal Home Loan Mortgage Corporation	72%	Reciprocal relationship from FMCKI graph: Reciprocal relationship from OSBC graph: We are located in an area where a large amount of development activity has occurred as rural and semi-rural areas ar…
FNMAS	Federal National Mortgage Association	72%	Reciprocal relationship from FNMAS graph: Reciprocal relationship from OSBC graph: Reciprocal relationship from FNMAS graph: Reciprocal relationship from OSBC graph: Reciprocal relationship from FNMA…
FNMAS	Federal National Mortgage Association	72%	We are located in an area where a large amount of development activity has occurred as rural and semi-rural areas are being suburbanized. This type of growth presents some economic risks should local…
FREJP	FREJP	72%	We are located in an area where a large amount of development activity has occurred as rural and semi-rural areas are being suburbanized. This type of growth presents some economic risks should local…
FREJP	FREJP	72%	Reciprocal relationship from FREJP graph: Reciprocal relationship from OSBC graph: We are located in an area where a large amount of development activity has occurred as rural and semi-rural areas ar…
BANCORP-FINANCIAL-INC	BANCORP-FINANCIAL-INC	62%	ual results may differ materially from those contained in these forward-looking statements. For additional information regarding our cautionary disclosures, see the “ Cautionary Note Regarding Forwar…
EVERGREEN-BANK-GROUP	EVERGREEN-BANK-GROUP	62%	ual results may differ materially from those contained in these forward-looking statements. For additional information regarding our cautionary disclosures, see the “ Cautionary Note Regarding Forwar…

Old Second Bancorp, Inc. Debt Obligations

Instrument	Description	Confidence	Evidence
OSBC-DEBT-11597	Xbrl Convertible	90%	xbrl convertible detail from xbrl 2019-01-16.
OSBC-DEBT-11596	Warrants outstanding: 815339	90%	xbrl warrant detail from xbrl 2019-01-16.
OSBC-DEBT	Debt stack $324.1M	90%	Market cache reports total debt of $324.1M.

Old Second Bancorp, Inc. Acquisitions

No acquisitions on recordNo completed or pending acquisitions found in our database for Old Second Bancorp, Inc..

Old Second Bancorp, Inc. Ownership

Holder	Name	Confidence	Evidence
OSBC-OWNER-VANGUARD-CAPITAL-MANAGEMENT-LLC	VANGUARD CAPITAL MANAGEMENT LLC	90%	13F overlay lists VANGUARD CAPITAL MANAGEMENT LLC as top holder; 189 tracked holders.

Old Second Bancorp, Inc. Extended Supply Chain Network

Ticker	Name	Chain Index	Hops	Relationship Types
FMCKI	Federal Home Loan Mortgage Corporation	100.00	1	['customer', 'supplier']
FNMAS	Federal National Mortgage Association	100.00	1	['customer', 'supplier']
FREJP	FEDERAL HOME LOAN MORTGAGE CORP	100.00	1	['customer', 'supplier']
AGM	Federal Agricultural Mortgage Corporation	50.00	2
ACT	Enact Holdings, Inc.	50.00	2
CWK	Cushman & Wakefield Limited	50.00	2
AXS	AXIS Capital Holdings Limited	50.00	2
CNC	Centene Corporation	50.00	2
FOA	Finance of America Companies Inc.	50.00	2
FSBW	FS Bancorp, Inc.	50.00	2
FCNCA	First Citizens BancShares, Inc.	50.00	2
CBK	Commercial Bancgroup, Inc.	50.00	2
CBRE	CBRE Group, Inc.	50.00	2
FKYS	First Keystone Corporation	50.00	2
FDBC	Fidelity D & D Bancorp, Inc.	50.00	2
COHN	Cohen & Company Inc.	50.00	2
COSO	CoastalSouth Bancshares, Inc.	50.00	2
CPBI	Central Plains Bancshares, Inc.	50.00	2
FCAP	First Capital, Inc.	50.00	2
CZWI	Citizens Community Bancorp, Inc.	50.00	2

Old Second Bancorp, Inc. Supply Chain