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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 4,126,244 | $83.2M | 0.00% | −29,662−0.7% | Reduced |
| Dimensional Fund Advisors LP | 2,388,862 | $48.2M | 0.01% | +127,988+5.7% | Added |
| Vanguard Capital Management LLC | 2,251,849 | $45.4M | 0.00% | +2,251,849 | New |
| Davis Asset Management, L.P. | 1,800,000 | $36.3M | 1.05% | +54,477+3.1% | Added |
| Goldman Sachs Group Inc | 1,691,523 | $34.1M | 0.00% | +428,300+33.9% | Added |
| State Street Corp | 1,599,302 | $32.2M | 0.00% | +59,883+3.9% | Added |
| American Century Companies Inc | 1,590,943 | $32.1M | 0.02% | +120,758+8.2% | Added |
| FJ Capital Management LLC | 1,505,102 | $30.3M | 3.42% | −324,563−17.7% | Reduced |
| Boston Partners | 1,443,889 | $29.3M | 0.03% | +626,578+76.7% | Added |
| Geode Capital Management, LLC | 1,282,011 | $25.9M | 0.00% | −83,437−6.1% | Reduced |
| Kennedy Capital Management, Inc. | 1,268,490 | $25.6M | 0.54% | +1,448+0.1% | Added |
| Banc Funds Co LLC | 1,029,143 | $20.7M | 3.86% | +123,953+13.7% | Added |
| Manufacturers Life Insurance Company, The | 878,670 | $17.7M | 0.02% | −13,208−1.5% | Reduced |
| Wellington Management Group LLP | 857,785 | $17.3M | 0.00% | −111,923−11.5% | Reduced |
| Stieven Capital Advisors, L.P. | 773,528 | $15.6M | 3.33% | −2,600−0.3% | Reduced |
| Northern Trust Corp | 764,341 | $15.4M | 0.00% | −117,235−13.3% | Reduced |
| River Street Advisors LLC | 746,660 | $15.1M | 5.09% | +380,589+104.0% | Added |
| Vanguard Portfolio Management LLC | 712,433 | $14.4M | 0.00% | +712,433 | New |
| JPMorgan Chase & Co | 700,953 | $13.9M | 0.00% | −157,853−18.4% | Reduced |
| Alliancebernstein L.P. | 690,845 | $13.5M | 0.00% | +4,813+0.7% | Added |
| Bridgeway Capital Management, LLC | 438,255 | $8.84M | 0.18% | +10,638+2.5% | Added |
| Charles Schwab Investment Management Inc | 430,910 | $8.69M | 0.00% | −6,600−1.5% | Reduced |
| Nuveen, LLC | 419,642 | $8.46M | 0.00% | +4,172+1.0% | Added |
| AQR Capital Management LLC | 391,960 | $7.90M | 0.00% | −55,158−12.3% | Reduced |
| Gator Capital Management, LLC | 351,480 | $7.09M | 1.51% | +13,485+4.0% | Added |
| Bank of New York Mellon Corp | 337,264 | $6.80M | 0.00% | −7,028−2.0% | Reduced |
| Vanguard Fiduciary Trust Co | 335,483 | $6.76M | 0.00% | +335,483 | New |
| Bank of America Corp | 331,330 | $6.68M | 0.00% | −11,249−3.3% | Reduced |
| Morgan Stanley | 278,387 | $5.61M | 0.00% | −9,735−3.4% | Reduced |
| UBS Group AG | 259,274 | $5.23M | 0.00% | +82,172+46.4% | Added |
| Empowered Funds, LLC | 233,559 | $4.71M | 0.03% | +233,559 | New |
| Forum Financial Management, LP | 205,661 | $4.15M | 0.06% | −3,223−1.5% | Reduced |
| SEI Investments Co | 203,088 | $4.09M | 0.00% | +86,057+73.5% | Added |
| Great Lakes Advisors, LLC | 198,004 | $3.99M | 0.03% | +30,619+18.3% | Added |
| Squarepoint Ops LLC | 170,651 | $3.44M | 0.01% | +122,179+252.1% | Added |
| Elizabeth Park Capital Advisors, Ltd. | 166,457 | $3.36M | 2.58% | +7,800+4.9% | Added |
| Siena Capital Partners GP, LLC | 163,038 | $3.29M | 0.85% | 00.0% | Unchanged |
| Blair William & Co | 162,883 | $3.28M | 0.01% | +8,664+5.6% | Added |
| EJF Capital LLC | 151,170 | $3.05M | 2.15% | +2,094+1.4% | Added |
| Jacobs Asset Management, LLC | 150,000 | $3.02M | 1.81% | −131,477−46.7% | Reduced |
| Thrivent Financial for Lutherans | 143,119 | $2.88M | 0.01% | 00.0% | Unchanged |
| Arrowstreet Capital, Limited Partnership | 141,026 | $2.84M | 0.00% | −75,485−34.9% | Reduced |
| Victory Capital Management Inc | 139,054 | $2.80M | 0.00% | −15,661−10.1% | Reduced |
| Knights of Columbus Asset Advisors LLC | 131,441 | $2.65M | 0.15% | −1,504−1.1% | Reduced |
| State of New Jersey Common Pension Fund D | 129,379 | $2.61M | 0.01% | 00.0% | Unchanged |
| Bank of Montreal | 118,465 | $2.39M | 0.00% | −20,787−14.9% | Reduced |
| Russell Investments Group, Ltd. | 111,949 | $2.26M | 0.00% | −172−0.2% | Reduced |
| RMB Capital Management, LLC | 100,505 | $2.03M | 0.04% | 00.0% | Unchanged |
| Mendon Capital Advisors Corp | 100,000 | $2.02M | 0.78% | 00.0% | Unchanged |
| Swiss National Bank | 98,700 | $1.99M | 0.00% | 00.0% | Unchanged |
| Fisher Asset Management, LLC | 97,285 | $1.96M | 0.00% | 00.0% | Unchanged |
| Sara-Bay Financial | 94,063 | $1.90M | 0.59% | −5,000−5.0% | Reduced |
| Renaissance Technologies LLC | 90,225 | $1.82M | 0.00% | +3,900+4.5% | Added |
| Franklin Resources Inc | 88,166 | $1.78M | 0.00% | +88,166 | New |
| Martingale Asset Management L P | 87,224 | $1.76M | 0.04% | −23,244−21.0% | Reduced |
| Barclays PLC | 87,002 | $1.75M | 0.00% | −56,186−39.2% | Reduced |
| HSBC Holdings PLC | 85,183 | $1.72M | 0.00% | +5,078+6.3% | Added |
| MSH Capital Advisors LLC | 84,826 | $1.71M | 0.36% | 00.0% | Unchanged |
| Invesco Ltd. | 81,612 | $1.65M | 0.00% | +1,067+1.3% | Added |
| Principal Financial Group Inc | 75,090 | $1.51M | 0.00% | +25,308+50.8% | Added |
| JCSD Capital, LLC | 74,100 | $1.49M | 2.33% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 67,530 | $1.36M | 0.00% | +2,791+4.3% | Added |
| Two Sigma Investments, LP | 67,357 | $1.36M | 0.00% | +34,758+106.6% | Added |
| Rhumbline Advisers | 66,095 | $1.33M | 0.00% | −879−1.3% | Reduced |
| Citadel Advisors LLC | 60,065 | $1.21M | 0.00% | −7,248−10.8% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 52,576 | $1.06M | 0.02% | +52,576 | New |
| Ieq Capital, LLC | 52,507 | $1.06M | 0.00% | −4,758−8.3% | Reduced |
| Jane Street Group, LLC | 51,428 | $1.04M | 0.00% | +51,428 | New |
| Quantinno Capital Management LP | 49,879 | $1.01M | 0.00% | +18,461+58.8% | Added |
| Creative Planning | 46,949 | $946.5K | 0.00% | −260−0.6% | Reduced |
| California State Teachers Retirement System | 46,796 | $943.4K | 0.00% | −376−0.8% | Reduced |
| Deutsche Bank AG | 46,477 | $937.0K | 0.00% | +5,290+12.8% | Added |
| Hunter Perkins Capital Management, LLC | 46,184 | $931.0K | 0.22% | +364+0.8% | Added |
| Wealth Enhancement Advisory Services, LLC | 42,784 | $887.3K | 0.00% | +14,420+50.8% | Added |
| HighTower Advisors, LLC | 43,852 | $884.1K | 0.00% | −150−0.3% | Reduced |
| Price T Rowe Associates Inc | 41,463 | $837.0K | 0.00% | +7,201+21.0% | Added |
| CI Private Wealth, LLC | 41,087 | $825.4K | 0.00% | +154+0.4% | Added |
| Legal & General Group Plc | 40,107 | $808.6K | 0.00% | −10,517−20.8% | Reduced |
| Black Maple Capital Management LP | 39,224 | $790.8K | 0.61% | −9,776−20.0% | Reduced |
| Susquehanna International Group, LLP | 38,533 | $776.8K | 0.00% | +38,533 | New |
| Citigroup Inc | 37,231 | $750.6K | 0.00% | −8,193−18.0% | Reduced |
| Rafferty Asset Management, LLC | 35,695 | $719.6K | 0.00% | −7,354−17.1% | Reduced |
| Campbell & CO Investment Adviser LLC | 35,444 | $714.6K | 0.04% | +24,448+222.3% | Added |
| Gamco Investors, Inc. Et Al | 32,721 | $659.7K | 0.01% | 00.0% | Unchanged |
| HGK Asset Management Inc | 32,082 | $646.8K | 0.09% | −26,159−44.9% | Reduced |
| Vanguard Global Advisers, LLC | 31,893 | $643.0K | 0.00% | +31,893 | New |
| Royal Bank of Canada | 31,569 | $637.0K | 0.00% | −3,262−9.4% | Reduced |
| Millennium Management LLC | 31,475 | $634.5K | 0.00% | −282,085−90.0% | Reduced |
| Vanguard Asset Management, Ltd | 30,459 | $614.1K | 0.00% | +30,459 | New |
| Rothschild Investment LLC | 28,305 | $570.6K | 0.03% | +130.0% | Added |
| MetLife Investment Management | 28,053 | $565.5K | 0.00% | −295−1.0% | Reduced |
| Atom Investors LP | 26,934 | $543.0K | 0.04% | +26,934 | New |
| Janus Henderson Group PLC | 26,232 | $529.0K | 0.00% | +10,597+67.8% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 23,641 | $476.6K | 0.00% | +236+1.0% | Added |
| CWM, LLC | 23,515 | $474.1K | 0.00% | −570−2.4% | Reduced |
| Ameriprise Financial Inc | 23,294 | $469.6K | 0.00% | −27,335−54.0% | Reduced |
| Lakewood Asset Management LLC | 22,651 | $456.6K | 0.29% | +1,291+6.0% | Added |
| nVerses Capital, LLC | 21,243 | $428.3K | 0.39% | +21,243 | New |
| Nicolet Bankshares Inc | 20,210 | $413.3K | 0.02% | +20,210 | New |
| Wells Fargo & Company | 19,822 | $399.6K | 0.00% | −36,722−64.9% | Reduced |