Old Second BancorpOSBC
13F holders, Q1 2026 (March 31)188holders +3
19new positions
16sold out
6famous investors
$20.15avg. 13F price*
At the end of Q1 2026, 188 institutions reported holding Old Second Bancorp Inc. (OSBC) in their 13F filings, up 3 from Q4 2025. 19 opened new positions and 16 sold out. The largest holders were BlackRock, Inc. ($83.2M), Dimensional Fund Advisors LP ($48.2M) and Vanguard Capital Management LLC ($45.4M). 6 famous investors held it, including Mario Gabelli (0.0% of GAMCO Investors's portfolio), Cliff Asness (0.0% of AQR Capital Management's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Old Second Bancorp Inc.
- CUSIP
- 680277100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 19 | $12.3M |
| Exits | 16 | $9.4M |
All 13F filers, Q4 2025 → Q1 2026: 3,083,136 shares bought and 2,385,743 shares sold, net +697,393 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 188 holders
| BlackRock, Inc. | 0.00% | Reduce -0.7% | 4,126,244 | $83.2M |
| Dimensional Fund Advisors LP | 0.01% | Add +5.7% | 2,388,862 | $48.2M |
| Vanguard Capital Management LLC | 0.00% | — | 2,251,849 | $45.4M |
| Davis Asset Management, L.P. | 1.05% | Add +3.1% | 1,800,000 | $36.3M |
| Goldman Sachs Group Inc. | 0.00% | Add +33.9% | 1,691,523 | $34.1M |
| State Street Corp. | 0.00% | Add +3.9% | 1,599,302 | $32.2M |
| American Century Companies Inc. | 0.02% | Add +8.2% | 1,590,943 | $32.1M |
| FJ Capital Management LLC | 3.42% | Reduce -17.7% | 1,505,102 | $30.3M |
| Boston Partners | 0.03% | Add +76.7% | 1,443,889 | $29.3M |
| Geode Capital Management, LLC | 0.00% | Reduce -6.1% | 1,282,011 | $25.9M |
| Kennedy Capital Management LLC | 0.54% | Add +0.1% | 1,268,490 | $25.6M |
| Banc Funds Co. LLC | 3.86% | Add +13.7% | 1,029,143 | $20.7M |
| Manufacturers Life Insurance Company, The | 0.02% | Reduce -1.5% | 878,670 | $17.7M |
| Wellington Management Group LLP | 0.00% | Reduce -11.5% | 857,785 | $17.3M |
| Stieven Capital Advisors, L.P. | 3.33% | Reduce -0.3% | 773,528 | $15.6M |
| Northern Trust Corp. | 0.00% | Reduce -13.3% | 764,341 | $15.4M |
| River Street Advisors LLC | 5.09% | Add +104.0% | 746,660 | $15.1M |
| Vanguard Portfolio Management LLC | 0.00% | — | 712,433 | $14.4M |
| JPMorgan Chase & Co. | 0.00% | Reduce -18.4% | 700,953 | $13.9M |
| Alliancebernstein L.P. | 0.00% | Add +0.7% | 690,845 | $13.5M |
| Bridgeway Capital Management, LLC | 0.18% | Add +2.5% | 438,255 | $8.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -1.5% | 430,910 | $8.7M |
| Nuveen, LLC | 0.00% | Add +1.0% | 419,642 | $8.5M |
| AQR Capital Management | 0.00% | Reduce -12.3% | 391,960 | $7.9M |
| Gator Capital Management, LLC | 1.51% | Add +4.0% | 351,480 | $7.1M |
| Bank of New York Mellon Corp | 0.00% | Reduce -2.0% | 337,264 | $6.8M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 335,483 | $6.8M |
| Bank of America Corp. | 0.00% | Reduce -3.3% | 331,330 | $6.7M |
| Morgan Stanley | 0.00% | Reduce -3.4% | 278,387 | $5.6M |
| UBS Group AG | 0.00% | Add +46.4% | 259,274 | $5.2M |
| Empowered Funds, LLC | 0.03% | New | 233,559 | $4.7M |
| Forum Financial Management, LP | 0.06% | Reduce -1.5% | 205,661 | $4.1M |
| Sei Investments Co. | 0.00% | Add +73.5% | 203,088 | $4.1M |
| Great Lakes Advisors, LLC | 0.03% | Add +18.3% | 198,004 | $4.0M |
| Squarepoint Ops LLC | 0.01% | Add +252.1% | 170,651 | $3.4M |
| Elizabeth Park Capital Advisors, Ltd. | 2.58% | Add +4.9% | 166,457 | $3.4M |
| Siena Capital Partners GP, LLC | 0.85% | No change | 163,038 | $3.3M |
| Blair William & Co. | 0.01% | Add +5.6% | 162,883 | $3.3M |
| EJF Capital LP | 2.15% | Add +1.4% | 151,170 | $3.0M |
| Jacobs Asset Management, LLC | 1.81% | Reduce -46.7% | 150,000 | $3.0M |
| Thrivent Financial for Lutherans | 0.01% | No change | 143,119 | $2.9M |
| Arrowstreet Capital, Limited Partnership | 0.00% | Reduce -34.9% | 141,026 | $2.8M |
| Victory Capital Management Inc. | 0.00% | Reduce -10.1% | 139,054 | $2.8M |
| Knights of Columbus Asset Advisors LLC | 0.15% | Reduce -1.1% | 131,441 | $2.6M |
| State of New Jersey Common Pension Fund D | 0.01% | No change | 129,379 | $2.6M |
| Bank of Montreal | 0.00% | Reduce -14.9% | 118,465 | $2.4M |
| Russell Investments Group, Ltd. | 0.00% | Reduce -0.1% | 111,949 | $2.3M |
| Curi Capital, LLC | 0.04% | No change | 100,505 | $2.0M |
| Mendon Capital Advisors Corp. | 0.78% | No change | 100,000 | $2.0M |
| Swiss National Bank | 0.00% | No change | 98,700 | $2.0M |
| Fisher Asset Management | 0.00% | No change | 97,285 | $2.0M |
| Sara-Bay Financial | 0.57% | Reduce -5.0% | 94,063 | $1.9M |
| Renaissance Technologies | 0.00% | Add +4.5% | 90,225 | $1.8M |
| Franklin Resources Inc. | 0.00% | New | 88,166 | $1.8M |
| Martingale Asset Management L P | 0.04% | Reduce -21.0% | 87,224 | $1.8M |
| Barclays PLC | 0.00% | Reduce -39.2% | 87,002 | $1.8M |
| HSBC Holdings PLC | 0.00% | Add +6.3% | 85,183 | $1.7M |
| MSH Capital Advisors LLC | 0.36% | No change | 84,826 | $1.7M |
| Invesco Ltd. | 0.00% | Add +1.3% | 81,612 | $1.6M |
| Principal Financial Group Inc. | 0.00% | Add +50.8% | 75,090 | $1.5M |
| JCSD Capital, LLC | 2.33% | No change | 74,100 | $1.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +4.3% | 67,530 | $1.4M |
| Two Sigma Investments, LP | 0.00% | Add +106.6% | 67,357 | $1.4M |
| Rhumbline Advisers | 0.00% | Reduce -1.3% | 66,095 | $1.3M |
| Citadel Advisors | 0.00% | Reduce -10.8% | 60,065 | $1.2M |
| Y-Intercept (Hong Kong) Ltd | 0.02% | New | 52,576 | $1.1M |
| Ieq Capital, LLC | 0.00% | Reduce -8.3% | 52,507 | $1.1M |
| Jane Street Group, LLC | 0.00% | New | 51,428 | $1.0M |
| Quantinno Capital Management LP | 0.00% | Add +58.8% | 49,879 | $1.0M |
| Creative Planning | 0.00% | Reduce -0.6% | 46,949 | $946K |
| California State Teachers Retirement System | 0.00% | Reduce -0.8% | 46,796 | $943K |
| Deutsche Bank AG | 0.00% | Add +12.8% | 46,477 | $937K |
| Hunter Perkins Capital Management, LLC | 0.22% | Add +0.8% | 46,184 | $931K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +50.8% | 42,784 | $887K |
| HighTower Advisors, LLC | 0.00% | Reduce -0.3% | 43,852 | $884K |
| T. Rowe Price Associates Inc. | 0.00% | Add +21.0% | 41,463 | $837K |
| Corient Private Wealth LP | 0.00% | Add +0.4% | 41,087 | $825K |
| Legal & General Group Plc | 0.00% | Reduce -20.8% | 40,107 | $809K |
| Black Maple Capital Management LP | 0.61% | Reduce -19.9% | 39,224 | $791K |
| Susquehanna International Group, LLP | 0.00% | New | 38,533 | $777K |
| Citigroup Inc. | 0.00% | Reduce -18.0% | 37,231 | $751K |
| Rafferty Asset Management, LLC | 0.00% | Reduce -17.1% | 35,695 | $720K |
| Campbell & CO Investment Adviser LLC | 0.04% | Add +222.3% | 35,444 | $715K |
| GAMCO Investors | 0.01% | No change | 32,721 | $660K |
| Hudson Edge Investment Partners Inc. | 0.09% | Reduce -44.9% | 32,082 | $647K |
| Vanguard Global Advisers, LLC | 0.00% | — | 31,893 | $643K |
| Royal Bank of Canada | 0.00% | Reduce -9.4% | 31,569 | $637K |
| Millennium Management | 0.00% | Reduce -90.0% | 31,475 | $635K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 30,459 | $614K |
| Rothschild Investment LLC | 0.03% | Add +0.1% | 28,305 | $571K |
| MetLife Investment Management, LLC | 0.00% | Reduce -1.0% | 28,053 | $566K |
| Atom Investors LP | 0.04% | New | 26,934 | $543K |
| Janus Henderson Group PLC | 0.00% | Add +67.8% | 26,232 | $529K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +1.0% | 23,641 | $477K |
| Cwm, LLC | 0.00% | Reduce -2.4% | 23,515 | $474K |
| Ameriprise Financial Inc. | 0.00% | Reduce -54.0% | 23,294 | $470K |
| Lakewood Asset Management LLC | 0.29% | Add +6.0% | 22,651 | $457K |
| nVerses Capital, LLC | 0.39% | New | 21,243 | $428K |
| Nicolet Bankshares Inc. | 0.02% | New | 20,210 | $413K |
| Wells Fargo & Company | 0.00% | Reduce -64.9% | 19,822 | $400K |
"% of holder's portfolio" is OSBC's weight in each manager's 13F, not the share of Old Second Bancorp Inc. the manager owns.