Old Second Bancorp Inc

OSBC

Exchange: Nasdaq
Industry: State Commercial Banks
SEC CIK: 0000357173

SEC filings (opens in a new tab)

In the last 90 days, Old Second Bancorp Inc insiders filed 0 open-market purchases and 7 sales; 184 institutions reported holding it in 13F filings for Q2 2026, worth $903.3M in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Old Second Bancorp Inc changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of OSBC: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	197	4	185	−8
Shares	36.1M	26.6K	37.1M	+1.03M (+2.8%)
Value	$624.4M	$460.5K	$723.9M	+$100.0M (+16.0%)

4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (22)

Institutions that held Old Second Bancorp Inc at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to OSBC in Q4 2025
Institution	Shares	Value	% of portfolio
Boston Partners	817,311	$16.0M	0.02%
Millennium Management LLC	313,560	$6.11M	0.00%
Adage Capital Partners GP, L.L.C.	243,192	$4.74M	0.01%
Captrust Financial Advisors	18,444	$359.7K	0.00%
State of Wisconsin Investment Board	16,141	$314.8K	0.00%
Mirabella Financial Services LLP	14,583	$284.4K	0.03%
Abacus Wealth Partners, LLC	11,805	$230.2K	0.02%
DRW Securities, LLC	11,349	$221.3K	0.02%
Cerity Partners LLC	11,115	$216.7K	0.00%
Campbell & CO Investment Adviser LLC	10,996	$214.4K	0.01%
Canada Pension Plan Investment Board	7,000	$136.5K	0.00%
Sfam, LLC	5,827	$113.6K	0.10%
Parkside Financial Bank & Trust	2,291	$44.7K	0.00%
Rockefeller Capital Management L.P.	1,396	$27.2K	0.00%
Harbour Investments, Inc.	1,347	$26.3K	0.00%
Pinnacle Wealth Planning Services, Inc.	1,045	$20.4K	0.00%
Eastern Bank	758	$14.8K	0.00%
Eurizon Capital SGR S.p.A.	188	$3.67K	0.00%
Larson Financial Group LLC	128	$2.50K	0.00%
Torren Management, LLC	44	$856	0.00%
Bruce G. Allen Investments, LLC	23	$449	0.00%
TD Private Client Wealth LLC	12	$234	0.00%

Sold out (30)

Institutions that held Old Second Bancorp Inc at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of OSBC in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Empowered Funds, LLC	198,548	$3.43M
LSV Asset Management	193,426	$3.34M
Boothbay Fund Management, LLC	125,249	$2.16M
PMC FIG Opportunities LLC	56,569	$977.8K
Bailard, Inc.	47,750	$825.4K
Point72 Asset Management, L.P.	47,672	$824.0K
ExodusPoint Capital Management, LP	47,538	$821.7K
Two Sigma Advisers, LP	44,500	$769.2K
Skylands Capital, LLC	43,350	$749.5K
Dynamic Technology Lab Private Ltd	41,951	$725.0K
Pinnacle Financial Group, LLC	36,414	$629.4K
MQS Management LLC	31,654	$547.1K
R Squared Ltd	30,899	$534.1K
Prudential Financial Inc	29,910	$516.8K
Franklin Resources Inc	28,116	$486.0K
Magnetar Financial LLC	23,901	$413.1K
Jane Street Group, LLC	22,309	$385.6K
Tudor Investment Corp Et Al	21,772	$376.3K
Jupiter Asset Management Ltd	19,522	$337.4K
Persistent Asset Partners Ltd	18,182	$314.3K
Jacobs Levy Equity Management, Inc	17,409	$300.9K
Fourthstone LLC	12,500	$216.1K
D. E. Shaw & Co., Inc.	12,166	$210.3K
Susquehanna International Group, LLP	11,273	$194.9K
Gsa Capital Partners LLP	10,881	$188.0K
STRS Ohio	10,500	$181.5K
Wealthspire Advisors, LLC	5,844	$101.0K
Mather Group, LLC.	3,872	$66.9K
Tompkins Financial Corp	1,145	$19.8K
Hallmark Capital Management Inc	1	$12

Not filed for Q4 2025 yet (4)

Institutions that held Old Second Bancorp Inc at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding OSBC in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Cobblestone Capital Advisors LLC	13,629	$235.6K
Corton Capital Inc.	10,427	$180.2K
Shell Asset Management Co	2,033	$35.0K
Point72 (DIFC) Ltd	561	$9.70K