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OSBC

Old Second Bancorp Inc

Company with tickers: OSBC

CIK
357173
CUSIP
680277100
Shares Outstanding
51,432,372
Price History Institutional Holders Short Volume Short Interest Fails to Deliver Financials SEC Filings Earnings Calls Insider Trades Congressional Trades
Holders: 182
Total Value: $679,697,197
Total Shares: 33,715,144
Showing 1–100 of 182 holdings by value · page 1 of 2

Institutional Ownership Trend

14 quarters

Holder Concentration

Across 182 13F filers · Δ vs Dec 31, 2025
Top Holder
12.2%
Jun 2023 → Mar 2026 · range 12.2% – 100.0%
−78.4 pts
Top 5
34.4%
Jun 2023 → Mar 2026 · range 34.4% – 100.0%
−65.5 pts
Top 10
55.5%
Jun 2023 → Mar 2026 · range 55.5% – 100.0%
−44.5 pts
HHI
423
Jun 2023 → Mar 2026 · range 423 – 10,000
Broadly held −7,831

Quarterly Activity

vs Dec 31, 2025
New
176
Increased
4
Decreased
1
Sold Out
1
Unchanged
1
Holder count: +175
Institutional value: +2400.5%
Shares held: +2318.6%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds
Mega GOLDMAN SACHS GROUP INC +428,300 1,691,523
Mega HSBC HOLDINGS PLC +5,078 85,183
Large Corient Private Wealth LLC +154 41,087
Small Caitong International Asset Management Co., Ltd +19 24

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds
Large Rockefeller Capital Management L.P. −1,079 265

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD)
Mega BlackRock, Inc. 4,126,244 $83,185,071
Mega DIMENSIONAL FUND ADVISORS LP 2,388,862 $48,159,456
Mid Davis Asset Management, L.P. 1,800,000 $36,288,000
Mega STATE STREET CORP 1,599,302 $32,241,928
Mega AMERICAN CENTURY COMPANIES INC 1,590,943 $32,073,410

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD)
Small EMC Capital Management 7,170 $139,815
100 of 100 shown
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Action
Mega BlackRock, Inc. $83,185,071 12.24% 4,126,244 View
Mega DIMENSIONAL FUND ADVISORS LP $48,159,456 7.09% 2,388,862 View
Mid Davis Asset Management, L.P. $36,288,000 5.34% 1,800,000 View
Mega GOLDMAN SACHS GROUP INC $34,101,103 5.02% 1,691,523 View
Mega STATE STREET CORP $32,241,928 4.74% 1,599,302 View
Mega AMERICAN CENTURY COMPANIES INC $32,073,410 4.72% 1,590,943 View
Small FJ Capital Management LLC $30,342,856 4.46% 1,505,102 View
Large Boston Partners $29,108,801 4.28% 1,443,889 View
Mega GEODE CAPITAL MANAGEMENT, LLC $25,845,341 3.80% 1,282,011 View
Mid KENNEDY CAPITAL MANAGEMENT LLC $25,572,758 3.76% 1,268,490 View
Small BANC FUNDS CO LLC $20,747,522 3.05% 1,029,143 View
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE $17,713,987 2.61% 878,670 View
Mega WELLINGTON MANAGEMENT GROUP LLP $17,292,945 2.54% 857,785 View
Small Stieven Capital Advisors, L.P. $15,594,324 2.29% 773,528 View
Small River Street Advisors LLC $15,052,665 2.21% 746,660 View
Mega JPMORGAN CHASE & CO $14,131,209 2.08% 700,953 View
Mega ALLIANCEBERNSTEIN L.P. $13,927,435 2.05% 690,845 View
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $8,835,220 1.30% 438,255 View
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $8,687,145 1.28% 430,910 View
Mega Nuveen, LLC $8,459,982 1.24% 419,642 View
Mega AQR CAPITAL MANAGEMENT LLC $7,901,911 1.16% 391,960 View
Small Gator Capital Management, LLC $7,085,836 1.04% 351,480 View
Mid NORTHERN TRUST CORP $6,847,041 1.01% 339,635 View
Mega Bank of New York Mellon Corp $6,799,241 1.00% 337,264 View
Mega BANK OF AMERICA CORP /DE/ $6,679,611 0.98% 331,330 View
Mega UBS Group AG $5,226,963 0.77% 259,274 View
Large Empowered Funds, LLC $4,708,549 0.69% 233,559 View
Small Forum Financial Management, LP $4,146,125 0.61% 205,661 View
Large SEI INVESTMENTS CO $4,094,253 0.60% 203,088 View
Large GREAT LAKES ADVISORS, LLC $3,991,760 0.59% 198,004 View
Large Squarepoint Ops LLC $3,440,324 0.51% 170,651 View
Small Elizabeth Park Capital Advisors, Ltd. $3,355,773 0.49% 166,457 View
Small Siena Capital Partners GP, LLC $3,286,846 0.48% 163,038 View
Large BLAIR WILLIAM & CO/IL $3,283,721 0.48% 162,883 View
Small EJF Capital LP $3,047,587 0.45% 151,170 View
Small JACOBS ASSET MANAGEMENT, LLC $3,024,000 0.44% 150,000 View
Large Thrivent Financial for Lutherans $2,885,278 0.42% 143,119 View
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $2,843,084 0.42% 141,026 View
Mega VICTORY CAPITAL MANAGEMENT INC $2,803,328 0.41% 139,054 View
Mid Knights of Columbus Asset Advisors LLC $2,649,850 0.39% 131,441 View
Large State of New Jersey Common Pension Fund D $2,608,280 0.38% 129,379 View
Mega BANK OF MONTREAL /CAN/ $2,388,253 0.35% 118,465 View
Large Russell Investments Group, Ltd. $2,256,891 0.33% 111,949 View
Mid Curi Capital, LLC $2,026,180 0.30% 100,505 View
Small MENDON CAPITAL ADVISORS CORP $2,016,000 0.30% 100,000 View
Mega Swiss National Bank $1,989,792 0.29% 98,700 View
Mega Fisher Asset Management, LLC $1,961,265 0.29% 97,285 View
Small Sara-Bay Financial $1,896,310 0.28% 94,063 View
Large RENAISSANCE TECHNOLOGIES LLC $1,818,936 0.27% 90,225 View
Mega FRANKLIN RESOURCES INC $1,777,426 0.26% 88,166 View
Mid MARTINGALE ASSET MANAGEMENT L P $1,758,435 0.26% 87,224 View
Mega BARCLAYS PLC $1,753,958 0.26% 87,002 View
Mega HSBC HOLDINGS PLC $1,717,289 0.25% 85,183 View
Small MSH Capital Advisors LLC $1,710,092 0.25% 84,826 View
Mega Invesco Ltd. $1,645,296 0.24% 81,612 View
Mega PRINCIPAL FINANCIAL GROUP INC $1,513,813 0.22% 75,090 View
Micro JCSD Capital, LLC $1,493,856 0.22% 74,100 View
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $1,361,404 0.20% 67,530 View
Mega TWO SIGMA INVESTMENTS, LP $1,357,917 0.20% 67,357 View
Mega RHUMBLINE ADVISERS $1,332,475 0.20% 66,095 View
Mega CITADEL ADVISORS LLC $1,210,910 0.18% 60,065 View
Mid Y-Intercept (Hong Kong) Ltd $1,059,932 0.16% 52,576 View
Large IEQ CAPITAL, LLC $1,058,541 0.16% 52,507 View
Mega JANE STREET GROUP, LLC $1,036,788 0.15% 51,428 View
Large Quantinno Capital Management LP $1,005,560 0.15% 49,879 View
Large Creative Planning $946,491 0.14% 46,949 View
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM $943,407 0.14% 46,796 View
Mega DEUTSCHE BANK AG\ $936,976 0.14% 46,477 View
Small Hunter Perkins Capital Management, LLC $931,069 0.14% 46,184 View
Large HighTower Advisors, LLC $884,056 0.13% 43,852 View
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $862,525 0.13% 42,784 View
Mega PRICE T ROWE ASSOCIATES INC /MD/ $835,893 0.12% 41,463 View
Large Corient Private Wealth LLC $828,313 0.12% 41,087 View
Mega Legal & General Group Plc $808,556 0.12% 40,107 View
Small Black Maple Capital Management LP $790,755 0.12% 39,224 View
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $776,825 0.11% 38,533 View
Mega CITIGROUP INC $750,576 0.11% 37,231 View
Large Rafferty Asset Management, LLC $719,611 0.11% 35,695 View
Mid Campbell & CO Investment Adviser LLC $714,551 0.11% 35,444 View
Mid GAMCO INVESTORS, INC. ET AL $659,655 0.10% 32,721 View
Small HUDSON EDGE INVESTMENT PARTNERS INC. $646,773 0.10% 32,082 View
Mega ROYAL BANK OF CANADA $636,430 0.09% 31,569 View
Mega MILLENNIUM MANAGEMENT LLC $634,536 0.09% 31,475 View
Mid ROTHSCHILD INVESTMENT LLC $570,628 0.08% 28,305 View
Large MetLife Investment Management, LLC $565,548 0.08% 28,053 View
Mid Atom Investors LP $542,989 0.08% 26,934 View
Mega JANUS HENDERSON GROUP PLC $528,837 0.08% 26,232 View
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. $476,602 0.07% 23,641 View
Large CWM, LLC $474,062 0.07% 23,515 View
Mega AMERIPRISE FINANCIAL INC $469,606 0.07% 23,294 View
Micro Lakewood Asset Management LLC $456,644 0.07% 22,651 View
Small nVerses Capital, LLC $428,258 0.06% 21,243 View
Mid NICOLET BANKSHARES INC $407,433 0.06% 20,210 View
Mega WELLS FARGO & COMPANY/MN $399,611 0.06% 19,822 View
Mega ENVESTNET ASSET MANAGEMENT INC $394,954 0.06% 19,591 View
Mega RAYMOND JAMES FINANCIAL INC $388,744 0.06% 19,283 View
Mega FIRST TRUST ADVISORS LP $378,201 0.06% 18,760 View
Micro 4WEALTH ADVISORS, INC. $375,984 0.06% 18,650 View
Large CAPTRUST FINANCIAL ADVISORS $365,299 0.05% 18,120 View
Large Mariner, LLC $364,230 0.05% 18,067 View
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