Old Second Bancorp Inc
OSBC- Exchange
- Nasdaq
- Industry
- State Commercial Banks
- SEC CIK
- 0000357173
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.
13F holders, Q1 2026
Institutional positions in Old Second Bancorp Inc as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 188
- +8 vs. Q4 2025
- Shares held
- 37.8M
- +4.06M (+12.0%) vs. Q4 2025
- Total value
- $761.2M
- +$103.6M (+15.8%) vs. Q4 2025
- New holders
- 25
- 60 more added
- Sold out
- 17
- 64 more reduced
5 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting OSBC on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 184 | $903.3M |
| Q1 2026 | 188 | $761.2M |
| Q4 2025 | 185 | $723.9M |
| Q3 2025 | 197 | $624.4M |
| Q2 2025 | 183 | $579.1M |
| Q1 2025 | 192 | $546.2M |
| Q4 2024 | 180 | $573.9M |
| Q3 2024 | 175 | $495.0M |
| Q2 2024 | 153 | $457.4M |
| Q1 2024 | 151 | $415.0M |
| Q4 2023 | 160 | $470.4M |
| Q3 2023 | 145 | $406.8M |
| Q2 2023 | 134 | $385.5M |
| Q1 2023 | 155 | $415.0M |
| Q4 2022 | 145 | $471.2M |
| Q3 2022 | 133 | $384.5M |
| Q2 2022 | 135 | $395.2M |
| Q1 2022 | 136 | $403.8M |
| Q4 2021 | 129 | $281.7M |
| Q3 2021 | 113 | $266.1M |
| Q2 2021 | 115 | $253.5M |
| Q1 2021 | 101 | $271.1M |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Old Second Bancorp Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Millennium Management LLC | 31,475 | $634.5K | 0.00% | −282,085−90.0% | Reduced |
| Royal Bank of Canada | 31,569 | $637.0K | 0.00% | −3,262−9.4% | Reduced |
| Vanguard Global Advisers, LLC | 31,893 | $643.0K | 0.00% | +31,893 | New |
| HGK Asset Management Inc | 32,082 | $646.8K | 0.09% | −26,159−44.9% | Reduced |
| Gamco Investors, Inc. Et Al | 32,721 | $659.7K | 0.01% | 00.0% | Unchanged |
| Campbell & CO Investment Adviser LLC | 35,444 | $714.6K | 0.04% | +24,448+222.3% | Added |
| Rafferty Asset Management, LLC | 35,695 | $719.6K | 0.00% | −7,354−17.1% | Reduced |
| Citigroup Inc | 37,231 | $750.6K | 0.00% | −8,193−18.0% | Reduced |
| Susquehanna International Group, LLP | 38,533 | $776.8K | 0.00% | +38,533 | New |
| Black Maple Capital Management LP | 39,224 | $790.8K | 0.61% | −9,776−20.0% | Reduced |
| Legal & General Group Plc | 40,107 | $808.6K | 0.00% | −10,517−20.8% | Reduced |
| CI Private Wealth, LLC | 41,087 | $825.4K | 0.00% | +154+0.4% | Added |
| Price T Rowe Associates Inc | 41,463 | $837.0K | 0.00% | +7,201+21.0% | Added |
| HighTower Advisors, LLC | 43,852 | $884.1K | 0.00% | −150−0.3% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 42,784 | $887.3K | 0.00% | +14,420+50.8% | Added |
| Hunter Perkins Capital Management, LLC | 46,184 | $931.0K | 0.22% | +364+0.8% | Added |
| Deutsche Bank AG | 46,477 | $937.0K | 0.00% | +5,290+12.8% | Added |
| California State Teachers Retirement System | 46,796 | $943.4K | 0.00% | −376−0.8% | Reduced |
| Creative Planning | 46,949 | $946.5K | 0.00% | −260−0.6% | Reduced |
| Quantinno Capital Management LP | 49,879 | $1.01M | 0.00% | +18,461+58.8% | Added |
| Jane Street Group, LLC | 51,428 | $1.04M | 0.00% | +51,428 | New |
| Ieq Capital, LLC | 52,507 | $1.06M | 0.00% | −4,758−8.3% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 52,576 | $1.06M | 0.02% | +52,576 | New |
| Citadel Advisors LLC | 60,065 | $1.21M | 0.00% | −7,248−10.8% | Reduced |
| Rhumbline Advisers | 66,095 | $1.33M | 0.00% | −879−1.3% | Reduced |
| Two Sigma Investments, LP | 67,357 | $1.36M | 0.00% | +34,758+106.6% | Added |
| UBS Asset Management Americas Inc | 67,530 | $1.36M | 0.00% | +2,791+4.3% | Added |
| JCSD Capital, LLC | 74,100 | $1.49M | 2.33% | 00.0% | Unchanged |
| Principal Financial Group Inc | 75,090 | $1.51M | 0.00% | +25,308+50.8% | Added |
| Invesco Ltd. | 81,612 | $1.65M | 0.00% | +1,067+1.3% | Added |
| MSH Capital Advisors LLC | 84,826 | $1.71M | 0.36% | 00.0% | Unchanged |
| HSBC Holdings PLC | 85,183 | $1.72M | 0.00% | +5,078+6.3% | Added |
| Barclays PLC | 87,002 | $1.75M | 0.00% | −56,186−39.2% | Reduced |
| Martingale Asset Management L P | 87,224 | $1.76M | 0.04% | −23,244−21.0% | Reduced |
| Franklin Resources Inc | 88,166 | $1.78M | 0.00% | +88,166 | New |
| Renaissance Technologies LLC | 90,225 | $1.82M | 0.00% | +3,900+4.5% | Added |
| Sara-Bay Financial | 94,063 | $1.90M | 0.59% | −5,000−5.0% | Reduced |
| Fisher Asset Management, LLC | 97,285 | $1.96M | 0.00% | 00.0% | Unchanged |
| Swiss National Bank | 98,700 | $1.99M | 0.00% | 00.0% | Unchanged |
| Mendon Capital Advisors Corp | 100,000 | $2.02M | 0.78% | 00.0% | Unchanged |
| RMB Capital Management, LLC | 100,505 | $2.03M | 0.04% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 111,949 | $2.26M | 0.00% | −172−0.2% | Reduced |
| Bank of Montreal | 118,465 | $2.39M | 0.00% | −20,787−14.9% | Reduced |
| State of New Jersey Common Pension Fund D | 129,379 | $2.61M | 0.01% | 00.0% | Unchanged |
| Knights of Columbus Asset Advisors LLC | 131,441 | $2.65M | 0.15% | −1,504−1.1% | Reduced |
| Victory Capital Management Inc | 139,054 | $2.80M | 0.00% | −15,661−10.1% | Reduced |
| Arrowstreet Capital, Limited Partnership | 141,026 | $2.84M | 0.00% | −75,485−34.9% | Reduced |
| Thrivent Financial for Lutherans | 143,119 | $2.88M | 0.01% | 00.0% | Unchanged |
| Jacobs Asset Management, LLC | 150,000 | $3.02M | 1.81% | −131,477−46.7% | Reduced |
| EJF Capital LLC | 151,170 | $3.05M | 2.15% | +2,094+1.4% | Added |
| Blair William & Co | 162,883 | $3.28M | 0.01% | +8,664+5.6% | Added |
| Siena Capital Partners GP, LLC | 163,038 | $3.29M | 0.85% | 00.0% | Unchanged |
| Elizabeth Park Capital Advisors, Ltd. | 166,457 | $3.36M | 2.58% | +7,800+4.9% | Added |
| Squarepoint Ops LLC | 170,651 | $3.44M | 0.01% | +122,179+252.1% | Added |
| Great Lakes Advisors, LLC | 198,004 | $3.99M | 0.03% | +30,619+18.3% | Added |
| SEI Investments Co | 203,088 | $4.09M | 0.00% | +86,057+73.5% | Added |
| Forum Financial Management, LP | 205,661 | $4.15M | 0.06% | −3,223−1.5% | Reduced |
| Empowered Funds, LLC | 233,559 | $4.71M | 0.03% | +233,559 | New |
| UBS Group AG | 259,274 | $5.23M | 0.00% | +82,172+46.4% | Added |
| Morgan Stanley | 278,387 | $5.61M | 0.00% | −9,735−3.4% | Reduced |
| Bank of America Corp | 331,330 | $6.68M | 0.00% | −11,249−3.3% | Reduced |
| Vanguard Fiduciary Trust Co | 335,483 | $6.76M | 0.00% | +335,483 | New |
| Bank of New York Mellon Corp | 337,264 | $6.80M | 0.00% | −7,028−2.0% | Reduced |
| Gator Capital Management, LLC | 351,480 | $7.09M | 1.51% | +13,485+4.0% | Added |
| AQR Capital Management LLC | 391,960 | $7.90M | 0.00% | −55,158−12.3% | Reduced |
| Nuveen, LLC | 419,642 | $8.46M | 0.00% | +4,172+1.0% | Added |
| Charles Schwab Investment Management Inc | 430,910 | $8.69M | 0.00% | −6,600−1.5% | Reduced |
| Bridgeway Capital Management, LLC | 438,255 | $8.84M | 0.18% | +10,638+2.5% | Added |
| Alliancebernstein L.P. | 690,845 | $13.5M | 0.00% | +4,813+0.7% | Added |
| JPMorgan Chase & Co | 700,953 | $13.9M | 0.00% | −157,853−18.4% | Reduced |
| Vanguard Portfolio Management LLC | 712,433 | $14.4M | 0.00% | +712,433 | New |
| River Street Advisors LLC | 746,660 | $15.1M | 5.09% | +380,589+104.0% | Added |
| Northern Trust Corp | 764,341 | $15.4M | 0.00% | −117,235−13.3% | Reduced |
| Stieven Capital Advisors, L.P. | 773,528 | $15.6M | 3.33% | −2,600−0.3% | Reduced |
| Wellington Management Group LLP | 857,785 | $17.3M | 0.00% | −111,923−11.5% | Reduced |
| Manufacturers Life Insurance Company, The | 878,670 | $17.7M | 0.02% | −13,208−1.5% | Reduced |
| Banc Funds Co LLC | 1,029,143 | $20.7M | 3.86% | +123,953+13.7% | Added |
| Kennedy Capital Management, Inc. | 1,268,490 | $25.6M | 0.54% | +1,448+0.1% | Added |
| Geode Capital Management, LLC | 1,282,011 | $25.9M | 0.00% | −83,437−6.1% | Reduced |
| Boston Partners | 1,443,889 | $29.3M | 0.03% | +626,578+76.7% | Added |
| FJ Capital Management LLC | 1,505,102 | $30.3M | 3.42% | −324,563−17.7% | Reduced |
| American Century Companies Inc | 1,590,943 | $32.1M | 0.02% | +120,758+8.2% | Added |
| State Street Corp | 1,599,302 | $32.2M | 0.00% | +59,883+3.9% | Added |
| Goldman Sachs Group Inc | 1,691,523 | $34.1M | 0.00% | +428,300+33.9% | Added |
| Davis Asset Management, L.P. | 1,800,000 | $36.3M | 1.05% | +54,477+3.1% | Added |
| Vanguard Capital Management LLC | 2,251,849 | $45.4M | 0.00% | +2,251,849 | New |
| Dimensional Fund Advisors LP | 2,388,862 | $48.2M | 0.01% | +127,988+5.7% | Added |
| BlackRock, Inc. | 4,126,244 | $83.2M | 0.00% | −29,662−0.7% | Reduced |
| Adage Capital Partners GP, L.L.C. | 0 | $0 | 0.00% | −243,192−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −64,157−100.0% | Sold out |
| Teacher Retirement System of Texas | 0 | $0 | 0.00% | −30,267−100.0% | Sold out |
| Alps Advisors Inc | 0 | $0 | 0.00% | −25,189−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −24,375−100.0% | Sold out |
| Panagora Asset Management Inc | 0 | $0 | 0.00% | −20,927−100.0% | Sold out |
| HighPoint Advisor Group LLC | 0 | $0 | 0.00% | −17,956−100.0% | Sold out |
| Mirabella Financial Services LLP | 0 | $0 | 0.00% | −14,583−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −12,731−100.0% | Sold out |
| J.W. Cole Advisors, Inc. | 0 | $0 | 0.00% | −10,495−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −8,478−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −7,000−100.0% | Sold out |