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Old Second Bancorp, Inc. (OSBC) institutional ownership

Latest close $24.72 Jul 27, 2026
Market cap$747M 52-week range SectorFinancial Services
Funds holding · Q1 2026
159
reported OSBC position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
78 buyers · 81 sellers

Old Second Bancorp, Inc. (OSBC) price and institutional activity

Dates

Q1 2026

$0 bought by 78 investors
Boston PartnersGoldman Sachs Group Inc +76 more
$0 sold by 81 investors
Fj Capital Management LLCMillennium Management LLC +79 more
Bought Sold Totals per quarter; hover a bar for the names.

Old Second Bancorp, Inc. (OSBC) institutional activity · 159

Investor Type Est. change Change Δ Own Date
Boston Partners · Added
Change +627K Date Q1 2026
Boston Partners Added· Q1 2026 +627K Q1 2026
Goldman Sachs Group Inc · Added
Change +428K Date Q1 2026
Goldman Sachs Group Inc Added· Q1 2026 +428K Q1 2026
River Street Advisors LLC · Added
Change +381K Date Q1 2026
River Street Advisors LLC Added· Q1 2026 +381K Q1 2026
Fj Capital Management LLC · Reduced
Change −325K Date Q1 2026
Fj Capital Management LLC Reduced· Q1 2026 −325K Q1 2026
Millennium Management LLC · Reduced
Change −282K Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −282K Q1 2026
Adage Capital Partners Gp, L.L.C. · Exited
Change −243K Δ Own −100.0% Date Q1 2026
Adage Capital Partners Gp, L.L.C. Exited· Q1 2026 −243K −100.0% Q1 2026
JPMorgan Chase & Co · Reduced
Change −158K Date Q1 2026
JPMorgan Chase & Co Reduced· Q1 2026 −158K Q1 2026
Jacobs Asset Management, LLC · Reduced
Change −131K Date Q1 2026
Jacobs Asset Management, LLC Reduced· Q1 2026 −131K Q1 2026
Dimensional · Added
Change +128K Date Q1 2026
Dimensional Added· Q1 2026 +128K Q1 2026
Banc Funds Co LLC · Added
Change +124K Date Q1 2026
Banc Funds Co LLC Added· Q1 2026 +124K Q1 2026
Squarepoint Ops LLC · Added
Change +122K Date Q1 2026
Squarepoint Ops LLC Added· Q1 2026 +122K Q1 2026
American Century Companies Inc · Added
Change +121K Date Q1 2026
American Century Companies Inc Added· Q1 2026 +121K Q1 2026
Northern Trust · Reduced
Change −117K Date Q1 2026
Northern Trust Reduced· Q1 2026 −117K Q1 2026
Wellington Management Group LLP · Reduced
Change −112K Δ Own −11.5% Date Q1 2026
Wellington Management Group LLP Reduced· Q1 2026 −112K −11.5% Q1 2026
Vanguard · Added
Change +94K Date Q1 2026
Vanguard Added· Q1 2026 +94K Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 159

Famous investor activity in Old Second Bancorp, Inc. (OSBC)

Old Second Bancorp, Inc. (OSBC) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Adams Bradley S. · Officer Other Form 4 events 34
Owned 10K ΔOwn +0.3% Trade date Jun 30, 2026 Filed date Jul 2, 2026
Adams Bradley S. Officer Other Form 4 events 34 10K +0.3% Jun 30, 2026 Jul 2, 2026
Collins Gary S. · Director Other Form 4 events 37
Owned 7K ΔOwn +0.5% Trade date Jun 30, 2026 Filed date Jul 2, 2026
Collins Gary S. Director Other Form 4 events 37 7K +0.5% Jun 30, 2026 Jul 2, 2026
Pilmer Donald · Officer 2 operations 15
Owned 4K Trade date Jun 30, 2026 Filed date Jul 2, 2026
Pilmer Donald Officer 2 operations 15 4K Jun 30, 2026 Jul 2, 2026
Eccher James · Director 2 operations 132
Owned 33K Trade date Jun 30, 2026 Filed date Jul 2, 2026
Eccher James Director 2 operations 132 33K Jun 30, 2026 Jul 2, 2026
Gartelmann Richard A. Jr · Officer Other Form 4 events 42
Owned 13K ΔOwn +0.3% Trade date Jun 30, 2026 Filed date Jul 2, 2026
Gartelmann Richard A. Jr Officer Other Form 4 events 42 13K +0.3% Jun 30, 2026 Jul 2, 2026
Collins Gary S. · Director Sell −$108K
Price $21.12 Qty −5K Owned 58K Trade date May 22, 2026 Filed date May 26, 2026
Collins Gary S. Director Sell $21.12 −5K −$108K 58K May 22, 2026 May 26, 2026
Collins Gary S. · Director Sell −$211K
Price $21.12 Qty −10K Owned 63K Trade date May 21, 2026 Filed date May 21, 2026
Collins Gary S. Director Sell $21.12 −10K −$211K 63K May 21, 2026 May 21, 2026
Lyons Billy J. Jr · Director Buy +$502
Price $20.90 Qty +24 Owned 20K Trade date May 11, 2026 Filed date May 12, 2026
Lyons Billy J. Jr Director Buy $20.90 +24 +$502 20K May 11, 2026 May 12, 2026
Pilmer Donald · Officer Sell −$519K
Price $20.75 Qty −25K Owned 48K Trade date May 11, 2026 Filed date May 11, 2026
Pilmer Donald Officer Sell $20.75 −25K −$519K 48K May 11, 2026 May 11, 2026
Collins Gary S. · Director 2 operations −$319K
Price $21.23–$21.24 Qty −15K Owned 73K Trade date May 8, 2026 Filed date May 11, 2026
Collins Gary S. Director 2 operations $21.23–$21.24 −15K −$319K 73K May 8, 2026 May 11, 2026
Adams Bradley S. · Officer Other Form 4 events 35
Owned 10K Trade date Mar 31, 2026 Filed date Apr 2, 2026
Adams Bradley S. Officer Other Form 4 events 35 10K Mar 31, 2026 Apr 2, 2026
Collins Gary S. · Director Other Form 4 events 253
Owned 7K Trade date Mar 31, 2026 Filed date Apr 2, 2026
Collins Gary S. Director Other Form 4 events 253 7K Mar 31, 2026 Apr 2, 2026
Pilmer Donald · Officer 2 operations 14
Owned 183 Trade date Mar 31, 2026 Filed date Apr 2, 2026
Pilmer Donald Officer 2 operations 14 183 Mar 31, 2026 Apr 2, 2026
Eccher James · Director 2 operations 391
Owned 6K Trade date Mar 31, 2026 Filed date Apr 2, 2026
Eccher James Director 2 operations 391 6K Mar 31, 2026 Apr 2, 2026
Gartelmann Richard A. Jr · Officer Other Form 4 events 43
Owned 13K Trade date Mar 31, 2026 Filed date Apr 2, 2026
Gartelmann Richard A. Jr Officer Other Form 4 events 43 13K Mar 31, 2026 Apr 2, 2026
15 of 77
15 of 77 Sign in to continue to older insider transactions.

Old Second Bancorp, Inc. (OSBC) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
BlackRock Inc. 3.5M
% of shares outstanding 7.8% Filing date Jan 26, 2024
BlackRock Inc. 3.5M 7.8% Jan 26, 2024
Fj Capital Management LLC 2.6M
% of shares outstanding 5.9% Filing date Feb 8, 2024
Fj Capital Management LLC 2.6M 5.9% Feb 8, 2024
Vanguard Group Inc 2.4M
% of shares outstanding 5.3% Filing date Feb 13, 2024
Vanguard Group Inc 2.4M 5.3% Feb 13, 2024
Banc Funds Co LLC 817K
% of shares outstanding 1.8% Filing date Feb 10, 2022
Banc Funds Co LLC 817K 1.8% Feb 10, 2022
4 of 4

Old Second Bancorp, Inc. (OSBC) ownership FAQ

Who owns OSBC?

159 reporting institutions disclosed OSBC position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.