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.

Q1 2026 vs. Q4 2025

How the institutions holding Old Second Bancorp Inc changed between Q4 2025 and Q1 2026.

All holders in Q1 2026 All holders in Q4 2025

13F holders of OSBC: Q4 2025 compared with Q1 2026
Measure	Q4 2025	Of which not filed for Q1 2026	Q1 2026	Change
Holders	185	5	188	+8
Shares	37.1M	3.40M	37.8M	+4.06M (+12.0%)
Value	$723.9M	$66.3M	$761.2M	+$103.6M (+15.8%)

5 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (25)

Institutions that held Old Second Bancorp Inc at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to OSBC in Q1 2026
Institution	Shares	Value	% of portfolio
Vanguard Capital Management LLC	2,251,849	$45.4M	0.00%
Vanguard Portfolio Management LLC	712,433	$14.4M	0.00%
Vanguard Fiduciary Trust Co	335,483	$6.76M	0.00%
Empowered Funds, LLC	233,559	$4.71M	0.03%
Franklin Resources Inc	88,166	$1.78M	0.00%
Y-Intercept (Hong Kong) Ltd	52,576	$1.06M	0.02%
Jane Street Group, LLC	51,428	$1.04M	0.00%
Susquehanna International Group, LLP	38,533	$776.8K	0.00%
Vanguard Global Advisers, LLC	31,893	$643.0K	0.00%
Vanguard Asset Management, Ltd	30,459	$614.1K	0.00%
Atom Investors LP	26,934	$543.0K	0.04%
nVerses Capital, LLC	21,243	$428.3K	0.39%
Nicolet Bankshares Inc	20,210	$413.3K	0.02%
Assenagon Asset Management S.A.	17,860	$360.1K	0.00%
Susquehanna Fundamental Investments, LLC	16,425	$331.1K	0.01%
Amundi	13,706	$276.3K	0.00%
XTX Topco Ltd	10,590	$213.5K	0.00%
Vanguard Investments Australia, Ltd.	10,395	$209.6K	0.00%
Skopos Labs, Inc.	10,216	$206.0K	0.01%
Savant Capital, LLC	10,088	$203.4K	0.00%
Quarry LP	280	$5.64K	0.00%
Root Financial Partners, LLC	106	$2.14K	0.00%
Keating Financial Advisory Services, Inc.	76	$1.53K	0.00%
Jones Financial Companies LLLP	36	$705	0.00%
GHP Investment Advisors, Inc.	1	$21	0.00%

Sold out (17)

Institutions that held Old Second Bancorp Inc at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of OSBC in Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Adage Capital Partners GP, L.L.C.	243,192	$4.74M
Qube Research & Technologies Ltd	64,157	$1.25M
Teacher Retirement System of Texas	30,267	$590.2K
Alps Advisors Inc	25,189	$491.2K
Verition Fund Management LLC	24,375	$475.3K
Panagora Asset Management Inc	20,927	$408.1K
HighPoint Advisor Group LLC	17,956	$350.1K
Mirabella Financial Services LLP	14,583	$284.4K
Brevan Howard Capital Management LP	12,731	$248.3K
J.W. Cole Advisors, Inc.	10,495	$204.7K
Quest Partners LLC	8,478	$165.3K
Canada Pension Plan Investment Board	7,000	$136.5K
Quantbot Technologies LP	4,008	$78.2K
Clearstead Advisors, LLC	2,431	$47.4K
Aquatic Capital Management LLC	1,775	$34.6K
Amalgamated Bank	1,584	$31.0K
Eurizon Capital SGR S.p.A.	188	$3.67K

Not filed for Q1 2026 yet (5)

Institutions that held Old Second Bancorp Inc at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding OSBC in Q4 2025 that haven't filed for Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Vanguard Group Inc	3,278,388	$63.9M
Brandywine Global Investment Management, LLC	90,620	$1.77M
David Loasby	20,210	$398.7K
EMC Capital Management	7,170	$140.0K
CIBC Private Wealth Group, LLC	5,320	$103.7K