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 1 open-market purchase and 5 sales; 184 institutions reported holding it in 13F filings for Q2 2026, worth $903.3M in total; no superinvestor holds it.
Holders of 5% or more of OSBC
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Old Second Bancorp Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Dimensional Fund Advisors LP | 13G | 5.10%2.58M shares | New | Oct 8, 20261 filing | Oct 8, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 5.03%2.56M shares | New | Oct 30, 20261 filing | Oct 30, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
16 Schedule 13D and 13G filings on Old Second Bancorp Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Oct 30, 202612:39 PM ET | Vanguard Capital Management LLC | 13G | 5.03%2.56M shares | New | Sep 30, 2026 | SEC |
| Oct 8, 20262:25 PM ET | Dimensional Fund Advisors LP | 13G | 5.10%2.58M shares | New | Sep 30, 2026 | SEC |
| Mar 27, 202611:08 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Nov 13, 20242:20 PM ET | FJ Capital Management LLCand 8 others | 13G/A | 4.17%1.87M shares | –Below 5% | Sep 30, 2024 | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13GOld format | – | New | – | SEC |
| Feb 8, 2024 | FJ Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Jan 26, 202411:49 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 8, 2023 | FJ Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Jan 31, 20231:58 PM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Apr 8, 20229:57 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 11, 2022 | FJ Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2022 | Banc Funds Co LLC | 13G/AOld format | – | – | – | SEC |
| Jan 31, 20225:49 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | FJ Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2021 | Banc Funds Co LLC | 13G/AOld format | – | – | – | SEC |
| Jan 29, 20215:23 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
4 notices from officers, directors and other affiliates planning to sell Old Second Bancorp Inc shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Sep 23, 202612:23 PM ET | Collins Gary SOfficer | 20.0K | $493.0K | Sep 23, 2026 | The Charles Schwab Corporation | SEC |
| Sep 8, 20263:21 PM ET | Hugh H. McLeanDirector | 25.0K | $641.9K | Sep 8, 2026 | UBS Financial Services Inc | SEC |
| Sep 2, 20264:00 PM ET | Campbell Darin PatrickDirector | 24.0K | $615.4K | Sep 2, 2026 | Charles Schwab Corp. Inc. | SEC |
| Aug 11, 202610:51 AM ET | Eccher JamesOfficer · Director | 75.0K | $1.90M | Aug 11, 202610b5-1 | THE CHARLES SCHWAB CORPORATION | SEC |