OLD SECOND BANCORP INC (OSBC) — Institutional Holders, Q2 2026
185 institutional investment managers reported a OSBC position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $902.2M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
OSBC in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- CONGRESS ASSET MANAGEMENTNew · +338,650 sh+$7.9M
- CITADEL ADVISORSAdded · +243,956 sh+$5.7M
- STATE STREETAdded · +239,900 sh+$5.6M
- MarinerAdded · +207,236 sh+$4.8M
- AMERICAN CENTURY COMPANIESAdded · +192,877 sh+$4.5M
Biggest sellers
- WELLINGTON MANAGEMENT GROUP LLPTrimmed · -313,440 sh-$7.3M
- NORTHERNTrimmed · -208,933 sh-$4.9M
- JACOBS ASSET MANAGEMENTSold out · -150,000 sh-$3.5M
- JPMORGAN CHASETrimmed · -145,351 sh-$3.4M
- UBS Group AGTrimmed · -112,051 sh-$2.6M
OSBC 13F holders ranked 1–100 of 185
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | BlackRock#1 · 4,298,683 sh | 4,298,683 | $100.2M | <0.01% | +4.2% |
| 2 | DIMENSIONAL FUND ADVISORS#2 · 2,498,671 sh | 2,498,671 | $58.3M | 0.01% | +4.6% |
| 3 | VANGUARD CAPITAL MANAGEMENT#3 · 2,179,877 sh | 2,179,877 | $50.8M | <0.01% | -3.2% |
| 4 | STATE STREET#4 · 1,839,202 sh | 1,839,202 | $42.9M | <0.01% | +15.0% |
| 5 | Davis Asset Management, L.P.#5 · 1,800,000 sh | 1,800,000 | $42.0M | 1.06% | 0.0% |
| 6 | AMERICAN CENTURY COMPANIES#6 · 1,783,820 sh | 1,783,820 | $41.6M | 0.02% | +12.1% |
| 7 | GOLDMAN SACHS GROUP#7 · 1,624,852 sh | 1,624,852 | $37.9M | <0.01% | -3.9% |
| 8 | FJ Capital Management#8 · 1,460,413 sh | 1,460,413 | $34.1M | 4.42% | -3.0% |
| 9 | Boston Partners#9 · 1,415,165 sh | 1,415,165 | $32.9M | 0.03% | -2.0% |
| 10 | GEODE CAPITAL MANAGEMENT#10 · 1,349,432 sh | 1,349,432 | $31.5M | <0.01% | +5.3% |
| 11 | KENNEDY CAPITAL MANAGEMENT#11 · 1,236,983 sh | 1,236,983 | $28.8M | 0.51% | -2.5% |
| 12 | BANC FUNDS#12 · 1,034,143 sh | 1,034,143 | $24.1M | 3.98% | +0.5% |
| 13 | MANUFACTURERS LIFE INSURANCE COMPANY, THE#13 · 872,651 sh | 872,651 | $20.4M | 0.02% | -0.7% |
| 14 | VANGUARD PORTFOLIO MANAGEMENT#14 · 819,368 sh | 819,368 | $19.1M | <0.01% | +15.0% |
| 15 | Stieven Capital Advisors, L.P.#15 · 815,328 sh | 815,328 | $19.0M | 3.63% | +5.4% |
| 16 | River Street Advisors#16 · 779,008 sh | 779,008 | $18.2M | — | +4.3% |
| 17 | NORTHERN#17 · 555,408 sh | 555,408 | $13.0M | <0.01% | -27.3% |
| 18 | ALLIANCEBERNSTEIN L.P.#18 · 641,845 sh | 641,845 | $12.9M | <0.01% | -7.1% |
| 19 | JPMORGAN CHASE#19 · 555,602 sh | 555,602 | $12.9M | <0.01% | -20.7% |
| 20 | WELLINGTON MANAGEMENT GROUP LLP#20 · 544,345 sh | 544,345 | $12.7M | <0.01% | -36.5% |
| 21 | Nuveen#21 · 492,162 sh | 492,162 | $11.5M | <0.01% | +17.3% |
| 22 | BRIDGEWAY CAPITAL MANAGEMENT#22 · 453,323 sh | 453,323 | $10.6M | 0.19% | +3.4% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT#23 · 431,304 sh | 431,304 | $10.1M | <0.01% | +0.1% |
| 24 | AQR CAPITAL MANAGEMENT#24 · 386,234 sh | 386,234 | $9.0M | <0.01% | -1.5% |
| 25 | BANK OF AMERICA#25 · 372,648 sh | 372,648 | $8.7M | <0.01% | +12.5% |
| 26 | Gator Capital Management#26 · 359,730 sh | 359,730 | $8.4M | 1.76% | +2.3% |
| 27 | Bank of New York Mellon#27 · 342,013 sh | 342,013 | $8.0M | <0.01% | +1.4% |
| 28 | VANGUARD FIDUCIARY#28 · 341,200 sh | 341,200 | $8.0M | <0.01% | +1.7% |
| 29 | CONGRESS ASSET MANAGEMENT#29 · 338,650 sh | 338,650 | $7.9M | — | New |
| 30 | MORGAN STANLEY#30 · 318,318 sh | 318,318 | $7.4M | <0.01% | +14.3% |
| 31 | CITADEL ADVISORS#31 · 304,021 sh | 304,021 | $7.1M | <0.01% | +406.2% |
| 32 | FRANKLIN RESOURCES#32 · 259,324 sh | 259,324 | $6.0M | <0.01% | +194.1% |
| 33 | Empowered Funds#33 · 248,627 sh | 248,627 | $5.8M | 0.03% | +6.5% |
| 34 | THRIVENT FINANCIAL FOR LUTHERANS#34 · 242,278 sh | 242,278 | $5.7M | <0.01% | +69.3% |
| 35 | Mariner#35 · 225,303 sh | 225,303 | $5.3M | <0.01% | +1147.0% |
| 36 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#36 · 210,745 sh | 210,745 | $4.9M | <0.01% | +49.4% |
| 37 | Forum Financial Management#37 · 205,673 sh | 205,673 | $4.8M | — | 0.0% |
| 38 | GREAT LAKES ADVISORS#38 · 203,909 sh | 203,909 | $4.8M | 0.04% | +3.0% |
| 39 | TWO SIGMA INVESTMENTS#39 · 200,819 sh | 200,819 | $4.7M | <0.01% | +198.1% |
| 40 | Squarepoint Ops#40 · 167,884 sh | 167,884 | $3.9M | <0.01% | -1.6% |
| 41 | BLAIR WILLIAM#41 · 163,228 sh | 163,228 | $3.8M | <0.01% | +0.2% |
| 42 | Siena Capital Partners GP#42 · 163,038 sh | 163,038 | $3.8M | 0.92% | 0.0% |
| 43 | EJF Capital#43 · 151,358 sh | 151,358 | $3.5M | 2.36% | +0.1% |
| 44 | UBS Group AG#44 · 147,223 sh | 147,223 | $3.4M | <0.01% | -43.2% |
| 45 | VICTORY CAPITAL MANAGEMENT#45 · 141,914 sh | 141,914 | $3.3M | <0.01% | +2.1% |
| 46 | Russell Investments Group, Ltd.#46 · 135,010 sh | 135,010 | $3.1M | <0.01% | +20.6% |
| 47 | Elizabeth Park Capital Advisors, Ltd.#47 · 129,457 sh | 129,457 | $3.0M | 2.09% | -22.2% |
| 48 | SEI INVESTMENTS#48 · 117,666 sh | 117,666 | $2.7M | <0.01% | -42.1% |
| 49 | D. E. Shaw#49 · 114,326 sh | 114,326 | $2.7M | <0.01% | New |
| 50 | RMB Capital Management#50 · 100,505 sh | 100,505 | $2.3M | 0.04% | 0.0% |
| 51 | Swiss National Bank#51 · 100,400 sh | 100,400 | $2.3M | <0.01% | +1.7% |
| 52 | MENDON CAPITAL ADVISORS#52 · 100,000 sh | 100,000 | $2.3M | 0.82% | 0.0% |
| 53 | Fisher Asset Management#53 · 97,285 sh | 97,285 | $2.3M | <0.01% | 0.0% |
| 54 | FIRST ADVISORS#54 · 94,347 sh | 94,347 | $2.2M | <0.01% | +402.9% |
| 55 | State of New Jersey Common Pension Fund D#55 · 88,964 sh | 88,964 | $2.1M | <0.01% | -31.2% |
| 56 | BARCLAYS PLC#56 · 87,603 sh | 87,603 | $2.0M | <0.01% | +0.7% |
| 57 | MSH Capital Advisors#57 · 84,826 sh | 84,826 | $2.0M | 0.34% | 0.0% |
| 58 | PRINCIPAL FINANCIAL GROUP#58 · 80,534 sh | 80,534 | $1.9M | <0.01% | +7.2% |
| 59 | Invesco Ltd.#59 · 77,241 sh | 77,241 | $1.8M | <0.01% | -5.4% |
| 60 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#60 · 76,132 sh | 76,132 | $1.8M | <0.01% | +12.7% |
| 61 | JCSD Capital#61 · 74,100 sh | 74,100 | $1.7M | — | 0.0% |
| 62 | Quantinno Capital Management#62 · 73,556 sh | 73,556 | $1.7M | <0.01% | +47.5% |
| 63 | RHUMBLINE ADVISERS#63 · 69,998 sh | 69,998 | $1.6M | <0.01% | +5.9% |
| 64 | HSBC PLC#64 · 66,312 sh | 66,312 | $1.5M | <0.01% | -22.2% |
| 65 | BANK OF MONTREAL#65 · 64,272 sh | 64,272 | $1.5M | <0.01% | -45.7% |
| 66 | MARTINGALE ASSET MANAGEMENT L P#66 · 61,224 sh | 61,224 | $1.4M | 0.03% | -29.8% |
| 67 | Sara-Bay Financial#67 · 61,000 sh | 61,000 | $1.4M | — | -35.1% |
| 68 | HUDSON EDGE INVESTMENT PARTNERS#68 · 60,706 sh | 60,706 | $1.4M | 0.19% | +89.2% |
| 69 | Knights of Columbus Asset Advisors#69 · 57,364 sh | 57,364 | $1.3M | 0.07% | -56.4% |
| 70 | CITIGROUP#70 · 55,100 sh | 55,100 | $1.3M | <0.01% | +48.0% |
| 71 | Campbell & Investment Adviser#71 · 54,037 sh | 54,037 | $1.3M | 0.07% | +52.5% |
| 72 | Creative Planning#72 · 53,848 sh | 53,848 | $1.3M | <0.01% | +14.7% |
| 73 | ExodusPoint Capital Management#73 · 53,769 sh | 53,769 | $1.3M | <0.01% | New |
| 74 | DEUTSCHE BANK AG\#74 · 51,034 sh | 51,034 | $1.2M | <0.01% | +9.8% |
| 75 | SUSQUEHANNA FUNDAMENTAL INVESTMENTS#75 · 50,693 sh | 50,693 | $1.2M | 0.02% | +208.6% |
| 76 | IEQ CAPITAL#76 · 50,309 sh | 50,309 | $1.2M | <0.01% | -4.2% |
| 77 | PRICE T ROWE ASSOCIATES#77 · 46,957 sh | 46,957 | $1.1M | <0.01% | +13.3% |
| 78 | WEALTH ENHANCEMENT ADVISORY SERVICES#78 · 45,547 sh | 45,547 | $1.0M | — | +6.5% |
| 79 | HighTower Advisors#79 · 43,563 sh | 43,563 | $1.0M | <0.01% | -0.7% |
| 80 | WELLS FARGO & COMPANY#80 · 42,857 sh | 42,857 | $999.4K | <0.01% | +116.2% |
| 81 | Legal & General Group Plc#81 · 40,578 sh | 40,578 | $946.3K | <0.01% | +1.2% |
| 82 | FMR#82 · 39,922 sh | 39,922 | $931.0K | 0.00% | +583.4% |
| 83 | VANGUARD ASSET MANAGEMENT, Ltd#83 · 38,777 sh | 38,777 | $904.3K | <0.01% | +27.3% |
| 84 | Aquatic Capital Management#84 · 37,700 sh | 37,700 | $879.2K | 0.03% | New |
| 85 | Hunter Perkins Capital Management#85 · 34,889 sh | 34,889 | $814.0K | 0.18% | -24.5% |
| 86 | GSA CAPITAL PARTNERS LLP#86 · 34,819 sh | 34,819 | $812.0K | 0.05% | New |
| 87 | Sanctuary Advisors#87 · 33,909 sh | 33,909 | $790.8K | <0.01% | New |
| 88 | ROTHSCHILD INVESTMENT#88 · 32,819 sh | 32,819 | $765.3K | 0.03% | +15.9% |
| 89 | Rafferty Asset Management#89 · 32,388 sh | 32,388 | $755.3K | <0.01% | -9.3% |
| 90 | Vanguard Global Advisers#90 · 31,893 sh | 31,893 | $743.7K | <0.01% | 0.0% |
| 91 | STATE OF WISCONSIN INVESTMENT BOARD#91 · 30,528 sh | 30,528 | $711.9K | <0.01% | +70.7% |
| 92 | ROYAL BANK OF CANADA#92 · 30,051 sh | 30,051 | $701.0K | <0.01% | -4.8% |
| 93 | MetLife Investment Management#93 · 29,641 sh | 29,641 | $691.2K | <0.01% | +5.7% |
| 94 | OSAIC#94 · 27,233 sh | 27,233 | $635.1K | <0.01% | +187.4% |
| 95 | Jupiter Topco#95 · 26,232 sh | 26,232 | $612.4K | <0.01% | — |
| 96 | ENVESTNET ASSET MANAGEMENT#96 · 24,612 sh | 24,612 | $573.9K | <0.01% | +25.6% |
| 97 | MIRAE ASSET GLOBAL ETFS Ltd.#97 · 23,389 sh | 23,389 | $545.4K | <0.01% | -1.1% |
| 98 | Lakewood Asset Management#98 · 22,955 sh | 22,955 | $535.3K | — | +1.3% |
| 99 | RENAISSANCE TECHNOLOGIES#99 · 21,221 sh | 21,221 | $494.9K | <0.01% | -76.5% |
| 100 | MERCER GLOBAL ADVISORS#100 · 20,591 sh | 20,591 | $480.2K | <0.01% | +23.0% |
Funds that sold out of OSBC in Q2 2026 (20)
Held OSBC at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| JACOBS ASSET MANAGEMENT150,000 sh | 150,000 | $3.0M |
| JANE STREET GROUP51,428 sh | 51,428 | $1.0M |
| Corient Private Wealth41,087 sh | 41,087 | $825.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP38,533 sh | 38,533 | $776.8K |
| GAMCO INVESTORS, ET AL32,721 sh | 32,721 | $659.7K |
| MILLENNIUM MANAGEMENT31,475 sh | 31,475 | $634.5K |
| Atom Investors26,934 sh | 26,934 | $543.0K |
| nVerses Capital21,243 sh | 21,243 | $428.3K |
| Assenagon Asset Management S.A.17,860 sh | 17,860 | $360.1K |
| Universal- Beteiligungs- und Servicegesellschaft mbH15,821 sh | 15,821 | $319.0K |
| Amundi13,706 sh | 13,706 | $276.3K |
| CenterBook Partners13,425 sh | 13,425 | $270.6K |
| Abacus Wealth Partners11,590 sh | 11,590 | $233.7K |
| DRW Securities11,467 sh | 11,467 | $231.2K |
| XTX Topco Ltd10,590 sh | 10,590 | $213.5K |
| QUADRANT CAPITAL GROUP5,046 sh | 5,046 | $99.8K |
| MAI Capital Management1,491 sh | 1,491 | $30.1K |
| EASTERN BANK758 sh | 758 | $15.3K |
| Root Financial Partners106 sh | 106 | $2.1K |
| NATIONAL BANK OF CANADA3 sh | 3 | $60.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.