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.

Q3 2025 vs. Q2 2025

How the institutions holding Old Second Bancorp Inc changed between Q2 2025 and Q3 2025.

All holders in Q3 2025 All holders in Q2 2025

13F holders of OSBC: Q2 2025 compared with Q3 2025
Measure	Q2 2025	Of which not filed for Q3 2025	Q3 2025	Change
Holders	183	2	197	+16
Shares	32.6M	11.8K	36.1M	+3.50M (+10.7%)
Value	$579.1M	$209.6K	$624.4M	+$45.5M (+7.9%)

2 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (32)

Institutions that held Old Second Bancorp Inc at the end of Q3 2025 but not at the end of Q2 2025.

Institutions new to OSBC in Q3 2025
Institution	Shares	Value	% of portfolio
River Street Advisors LLC	383,949	$6.64M	2.57%
Bank of Montreal	179,350	$3.10M	0.00%
Boothbay Fund Management, LLC	125,249	$2.16M	0.06%
Sara-Bay Financial	99,063	$1.71M	0.48%
JCSD Capital, LLC	75,100	$1.30M	2.31%
PMC FIG Opportunities LLC	56,569	$977.8K	1.50%
CenterBook Partners LP	45,797	$791.6K	0.04%
Dynamic Technology Lab Private Ltd	41,951	$725.0K	0.12%
CI Private Wealth, LLC	40,753	$704.4K	0.00%
Pinnacle Financial Group, LLC	36,414	$629.4K	0.19%
4WEALTH Advisors, Inc.	33,558	$580.0K	0.54%
Gamco Investors, Inc. Et Al	32,721	$565.6K	0.01%
MQS Management LLC	31,654	$547.1K	0.32%
Magnetar Financial LLC	23,901	$413.1K	0.00%
Tudor Investment Corp Et Al	21,772	$376.3K	0.00%
Persistent Asset Partners Ltd	18,182	$314.3K	0.23%
Brevan Howard Capital Management LP	17,153	$296.4K	0.00%
Cetera Investment Advisers	15,834	$273.7K	0.00%
Kestra Advisory Services, LLC	14,802	$255.9K	0.00%
Mercer Global Advisors Inc	12,925	$223.4K	0.00%
Caldwell Sutter Capital, Inc.	11,000	$190.1K	0.08%
Squarepoint Ops LLC	10,355	$179.0K	0.00%
Wealthspire Advisors, LLC	5,844	$101.0K	0.00%
Mather Group, LLC.	3,872	$66.9K	0.00%
Quadrant Capital Group LLC	1,901	$32.9K	0.00%
State of Alaska, Department of Revenue	1,771	$30.0K	0.00%
Point72 (DIFC) Ltd	561	$9.70K	0.00%
Northwestern Mutual Wealth Management Co	400	$6.91K	0.00%
Optiver Holding B.V.	226	$3.91K	0.00%
First Horizon Corp	43	$743	0.00%
Smartleaf Asset Management LLC	20	$346	0.00%
Caitong International Asset Management Co., Ltd	1	$17	0.00%

Sold out (16)

Institutions that held Old Second Bancorp Inc at the end of Q2 2025 and filed for Q3 2025 without it.

Institutions that sold out of OSBC in Q3 2025
Institution	Shares, Q2 2025	Value, Q2 2025
Millennium Management LLC	57,426	$1.02M
Versor Investments LP	56,124	$995.6K
Jump Financial, LLC	37,718	$669.1K
Balyasny Asset Management LLC	24,465	$434.0K
Man Group plc	24,003	$425.8K
Jackson Creek Investment Advisors LLC	23,464	$416.0K
Mach-1 Financial Group, Inc.	18,953	$336.2K
Connor, Clark & Lunn Investment Management Ltd.	15,857	$281.3K
Assenagon Asset Management S.A.	15,280	$271.1K
Voya Investment Management LLC	14,146	$250.9K
Y-Intercept (Hong Kong) Ltd	13,610	$241.4K
EntryPoint Capital, LLC	13,539	$240.2K
Cubist Systematic Strategies, LLC	12,920	$229.2K
Dakota Wealth Management	12,254	$217.4K
Lazard Asset Management LLC	7,082	$125.0K
Quarry LP	2,942	$52.2K

Not filed for Q3 2025 yet (2)

Institutions that held Old Second Bancorp Inc at the end of Q2 2025 and haven't filed a 13F for Q3 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding OSBC in Q2 2025 that haven't filed for Q3 2025
Institution	Shares, Q2 2025	Value, Q2 2025
Avantax Advisory Services, Inc.	11,770	$208.8K
First Horizon Advisors, Inc.	43	$763